| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.database.sqlite; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.ContentValues; |
| import android.database.Cursor; |
| import android.database.DatabaseErrorHandler; |
| import android.database.DatabaseUtils; |
| import android.database.DefaultDatabaseErrorHandler; |
| import android.database.SQLException; |
| import android.database.sqlite.SQLiteDebug.DbStats; |
| import android.os.CancellationSignal; |
| import android.os.Looper; |
| import android.os.OperationCanceledException; |
| import android.text.TextUtils; |
| import android.util.EventLog; |
| import android.util.Log; |
| import android.util.Pair; |
| import android.util.Printer; |
| |
| import dalvik.system.CloseGuard; |
| |
| import java.io.File; |
| import java.io.FileFilter; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| /** |
| * Exposes methods to manage a SQLite database. |
| * |
| * <p> |
| * SQLiteDatabase has methods to create, delete, execute SQL commands, and |
| * perform other common database management tasks. |
| * </p><p> |
| * See the Notepad sample application in the SDK for an example of creating |
| * and managing a database. |
| * </p><p> |
| * Database names must be unique within an application, not across all applications. |
| * </p> |
| * |
| * <h3>Localized Collation - ORDER BY</h3> |
| * <p> |
| * In addition to SQLite's default <code>BINARY</code> collator, Android supplies |
| * two more, <code>LOCALIZED</code>, which changes with the system's current locale, |
| * and <code>UNICODE</code>, which is the Unicode Collation Algorithm and not tailored |
| * to the current locale. |
| * </p> |
| */ |
| public final class SQLiteDatabase extends SQLiteClosable { |
| private static final String TAG = "SQLiteDatabase"; |
| |
| private static final int EVENT_DB_CORRUPT = 75004; |
| |
| // Stores reference to all databases opened in the current process. |
| // (The referent Object is not used at this time.) |
| // INVARIANT: Guarded by sActiveDatabases. |
| private static WeakHashMap<SQLiteDatabase, Object> sActiveDatabases = |
| new WeakHashMap<SQLiteDatabase, Object>(); |
| |
| // Thread-local for database sessions that belong to this database. |
| // Each thread has its own database session. |
| // INVARIANT: Immutable. |
| private final ThreadLocal<SQLiteSession> mThreadSession = new ThreadLocal<SQLiteSession>() { |
| @Override |
| protected SQLiteSession initialValue() { |
| return createSession(); |
| } |
| }; |
| |
| // The optional factory to use when creating new Cursors. May be null. |
| // INVARIANT: Immutable. |
| private final CursorFactory mCursorFactory; |
| |
| // Error handler to be used when SQLite returns corruption errors. |
| // INVARIANT: Immutable. |
| private final DatabaseErrorHandler mErrorHandler; |
| |
| // Shared database state lock. |
| // This lock guards all of the shared state of the database, such as its |
| // configuration, whether it is open or closed, and so on. This lock should |
| // be held for as little time as possible. |
| // |
| // The lock MUST NOT be held while attempting to acquire database connections or |
| // while executing SQL statements on behalf of the client as it can lead to deadlock. |
| // |
| // It is ok to hold the lock while reconfiguring the connection pool or dumping |
| // statistics because those operations are non-reentrant and do not try to acquire |
| // connections that might be held by other threads. |
| // |
| // Basic rule: grab the lock, access or modify global state, release the lock, then |
| // do the required SQL work. |
| private final Object mLock = new Object(); |
| |
| // Warns if the database is finalized without being closed properly. |
| // INVARIANT: Guarded by mLock. |
| private final CloseGuard mCloseGuardLocked = CloseGuard.get(); |
| |
| // The database configuration. |
| // INVARIANT: Guarded by mLock. |
| private final SQLiteDatabaseConfiguration mConfigurationLocked; |
| |
| // The connection pool for the database, null when closed. |
| // The pool itself is thread-safe, but the reference to it can only be acquired |
| // when the lock is held. |
| // INVARIANT: Guarded by mLock. |
| private SQLiteConnectionPool mConnectionPoolLocked; |
| |
| // True if the database has attached databases. |
| // INVARIANT: Guarded by mLock. |
| private boolean mHasAttachedDbsLocked; |
| |
| /** |
| * When a constraint violation occurs, an immediate ROLLBACK occurs, |
| * thus ending the current transaction, and the command aborts with a |
| * return code of SQLITE_CONSTRAINT. If no transaction is active |
| * (other than the implied transaction that is created on every command) |
| * then this algorithm works the same as ABORT. |
| */ |
| public static final int CONFLICT_ROLLBACK = 1; |
| |
| /** |
| * When a constraint violation occurs,no ROLLBACK is executed |
| * so changes from prior commands within the same transaction |
| * are preserved. This is the default behavior. |
| */ |
| public static final int CONFLICT_ABORT = 2; |
| |
| /** |
| * When a constraint violation occurs, the command aborts with a return |
| * code SQLITE_CONSTRAINT. But any changes to the database that |
| * the command made prior to encountering the constraint violation |
| * are preserved and are not backed out. |
| */ |
| public static final int CONFLICT_FAIL = 3; |
| |
| /** |
| * When a constraint violation occurs, the one row that contains |
| * the constraint violation is not inserted or changed. |
| * But the command continues executing normally. Other rows before and |
| * after the row that contained the constraint violation continue to be |
| * inserted or updated normally. No error is returned. |
| */ |
| public static final int CONFLICT_IGNORE = 4; |
| |
| /** |
| * When a UNIQUE constraint violation occurs, the pre-existing rows that |
| * are causing the constraint violation are removed prior to inserting |
| * or updating the current row. Thus the insert or update always occurs. |
| * The command continues executing normally. No error is returned. |
| * If a NOT NULL constraint violation occurs, the NULL value is replaced |
| * by the default value for that column. If the column has no default |
| * value, then the ABORT algorithm is used. If a CHECK constraint |
| * violation occurs then the IGNORE algorithm is used. When this conflict |
| * resolution strategy deletes rows in order to satisfy a constraint, |
| * it does not invoke delete triggers on those rows. |
| * This behavior might change in a future release. |
| */ |
| public static final int CONFLICT_REPLACE = 5; |
| |
| /** |
| * Use the following when no conflict action is specified. |
| */ |
| public static final int CONFLICT_NONE = 0; |
| |
| private static final String[] CONFLICT_VALUES = new String[] |
| {"", " OR ROLLBACK ", " OR ABORT ", " OR FAIL ", " OR IGNORE ", " OR REPLACE "}; |
| |
| /** |
| * Maximum Length Of A LIKE Or GLOB Pattern |
| * The pattern matching algorithm used in the default LIKE and GLOB implementation |
| * of SQLite can exhibit O(N^2) performance (where N is the number of characters in |
| * the pattern) for certain pathological cases. To avoid denial-of-service attacks |
| * the length of the LIKE or GLOB pattern is limited to SQLITE_MAX_LIKE_PATTERN_LENGTH bytes. |
| * The default value of this limit is 50000. A modern workstation can evaluate |
| * even a pathological LIKE or GLOB pattern of 50000 bytes relatively quickly. |
| * The denial of service problem only comes into play when the pattern length gets |
| * into millions of bytes. Nevertheless, since most useful LIKE or GLOB patterns |
| * are at most a few dozen bytes in length, paranoid application developers may |
| * want to reduce this parameter to something in the range of a few hundred |
| * if they know that external users are able to generate arbitrary patterns. |
| */ |
| public static final int SQLITE_MAX_LIKE_PATTERN_LENGTH = 50000; |
| |
| /** |
| * Open flag: Flag for {@link #openDatabase} to open the database for reading and writing. |
| * If the disk is full, this may fail even before you actually write anything. |
| * |
| * {@more} Note that the value of this flag is 0, so it is the default. |
| */ |
| public static final int OPEN_READWRITE = 0x00000000; // update native code if changing |
| |
| /** |
| * Open flag: Flag for {@link #openDatabase} to open the database for reading only. |
| * This is the only reliable way to open a database if the disk may be full. |
| */ |
| public static final int OPEN_READONLY = 0x00000001; // update native code if changing |
| |
| private static final int OPEN_READ_MASK = 0x00000001; // update native code if changing |
| |
| /** |
| * Open flag: Flag for {@link #openDatabase} to open the database without support for |
| * localized collators. |
| * |
| * {@more} This causes the collator <code>LOCALIZED</code> not to be created. |
| * You must be consistent when using this flag to use the setting the database was |
| * created with. If this is set, {@link #setLocale} will do nothing. |
| */ |
| public static final int NO_LOCALIZED_COLLATORS = 0x00000010; // update native code if changing |
| |
| /** |
| * Open flag: Flag for {@link #openDatabase} to create the database file if it does not |
| * already exist. |
| */ |
| public static final int CREATE_IF_NECESSARY = 0x10000000; // update native code if changing |
| |
| /** |
| * Open flag: Flag for {@link #openDatabase} to open the database file with |
| * write-ahead logging enabled by default. Using this flag is more efficient |
| * than calling {@link #enableWriteAheadLogging}. |
| * |
| * Write-ahead logging cannot be used with read-only databases so the value of |
| * this flag is ignored if the database is opened read-only. |
| * |
| * @see #enableWriteAheadLogging |
| */ |
| public static final int ENABLE_WRITE_AHEAD_LOGGING = 0x20000000; |
| |
| /** |
| * Absolute max value that can be set by {@link #setMaxSqlCacheSize(int)}. |
| * |
| * Each prepared-statement is between 1K - 6K, depending on the complexity of the |
| * SQL statement & schema. A large SQL cache may use a significant amount of memory. |
| */ |
| public static final int MAX_SQL_CACHE_SIZE = 100; |
| |
| private SQLiteDatabase(String path, int openFlags, CursorFactory cursorFactory, |
| DatabaseErrorHandler errorHandler) { |
| mCursorFactory = cursorFactory; |
| mErrorHandler = errorHandler != null ? errorHandler : new DefaultDatabaseErrorHandler(); |
| mConfigurationLocked = new SQLiteDatabaseConfiguration(path, openFlags); |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| dispose(true); |
| } finally { |
| super.finalize(); |
| } |
| } |
| |
| @Override |
| protected void onAllReferencesReleased() { |
| dispose(false); |
| } |
| |
| private void dispose(boolean finalized) { |
| final SQLiteConnectionPool pool; |
| synchronized (mLock) { |
| if (mCloseGuardLocked != null) { |
| if (finalized) { |
| mCloseGuardLocked.warnIfOpen(); |
| } |
| mCloseGuardLocked.close(); |
| } |
| |
| pool = mConnectionPoolLocked; |
| mConnectionPoolLocked = null; |
| } |
| |
| if (!finalized) { |
| synchronized (sActiveDatabases) { |
| sActiveDatabases.remove(this); |
| } |
| |
| if (pool != null) { |
| pool.close(); |
| } |
| } |
| } |
| |
| /** |
| * Attempts to release memory that SQLite holds but does not require to |
| * operate properly. Typically this memory will come from the page cache. |
| * |
| * @return the number of bytes actually released |
| */ |
| public static int releaseMemory() { |
| return SQLiteGlobal.releaseMemory(); |
| } |
| |
| /** |
| * Control whether or not the SQLiteDatabase is made thread-safe by using locks |
| * around critical sections. This is pretty expensive, so if you know that your |
| * DB will only be used by a single thread then you should set this to false. |
| * The default is true. |
| * @param lockingEnabled set to true to enable locks, false otherwise |
| * |
| * @deprecated This method now does nothing. Do not use. |
| */ |
| @Deprecated |
| public void setLockingEnabled(boolean lockingEnabled) { |
| } |
| |
| /** |
| * Gets a label to use when describing the database in log messages. |
| * @return The label. |
| */ |
| String getLabel() { |
| synchronized (mLock) { |
| return mConfigurationLocked.label; |
| } |
| } |
| |
| /** |
| * Sends a corruption message to the database error handler. |
| */ |
| void onCorruption() { |
| EventLog.writeEvent(EVENT_DB_CORRUPT, getLabel()); |
| mErrorHandler.onCorruption(this); |
| } |
| |
| /** |
| * Gets the {@link SQLiteSession} that belongs to this thread for this database. |
| * Once a thread has obtained a session, it will continue to obtain the same |
| * session even after the database has been closed (although the session will not |
| * be usable). However, a thread that does not already have a session cannot |
| * obtain one after the database has been closed. |
| * |
| * The idea is that threads that have active connections to the database may still |
| * have work to complete even after the call to {@link #close}. Active database |
| * connections are not actually disposed until they are released by the threads |
| * that own them. |
| * |
| * @return The session, never null. |
| * |
| * @throws IllegalStateException if the thread does not yet have a session and |
| * the database is not open. |
| */ |
| SQLiteSession getThreadSession() { |
| return mThreadSession.get(); // initialValue() throws if database closed |
| } |
| |
| SQLiteSession createSession() { |
| final SQLiteConnectionPool pool; |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| pool = mConnectionPoolLocked; |
| } |
| return new SQLiteSession(pool); |
| } |
| |
| /** |
| * Gets default connection flags that are appropriate for this thread, taking into |
| * account whether the thread is acting on behalf of the UI. |
| * |
| * @param readOnly True if the connection should be read-only. |
| * @return The connection flags. |
| */ |
| int getThreadDefaultConnectionFlags(boolean readOnly) { |
| int flags = readOnly ? SQLiteConnectionPool.CONNECTION_FLAG_READ_ONLY : |
| SQLiteConnectionPool.CONNECTION_FLAG_PRIMARY_CONNECTION_AFFINITY; |
| if (isMainThread()) { |
| flags |= SQLiteConnectionPool.CONNECTION_FLAG_INTERACTIVE; |
| } |
| return flags; |
| } |
| |
| private static boolean isMainThread() { |
| // FIXME: There should be a better way to do this. |
| // Would also be nice to have something that would work across Binder calls. |
| Looper looper = Looper.myLooper(); |
| return looper != null && looper == Looper.getMainLooper(); |
| } |
| |
| /** |
| * Begins a transaction in EXCLUSIVE mode. |
| * <p> |
| * Transactions can be nested. |
| * When the outer transaction is ended all of |
| * the work done in that transaction and all of the nested transactions will be committed or |
| * rolled back. The changes will be rolled back if any transaction is ended without being |
| * marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed. |
| * </p> |
| * <p>Here is the standard idiom for transactions: |
| * |
| * <pre> |
| * db.beginTransaction(); |
| * try { |
| * ... |
| * db.setTransactionSuccessful(); |
| * } finally { |
| * db.endTransaction(); |
| * } |
| * </pre> |
| */ |
| public void beginTransaction() { |
| beginTransaction(null /* transactionStatusCallback */, true); |
| } |
| |
| /** |
| * Begins a transaction in IMMEDIATE mode. Transactions can be nested. When |
| * the outer transaction is ended all of the work done in that transaction |
| * and all of the nested transactions will be committed or rolled back. The |
| * changes will be rolled back if any transaction is ended without being |
| * marked as clean (by calling setTransactionSuccessful). Otherwise they |
| * will be committed. |
| * <p> |
| * Here is the standard idiom for transactions: |
| * |
| * <pre> |
| * db.beginTransactionNonExclusive(); |
| * try { |
| * ... |
| * db.setTransactionSuccessful(); |
| * } finally { |
| * db.endTransaction(); |
| * } |
| * </pre> |
| */ |
| public void beginTransactionNonExclusive() { |
| beginTransaction(null /* transactionStatusCallback */, false); |
| } |
| |
| /** |
| * Begins a transaction in EXCLUSIVE mode. |
| * <p> |
| * Transactions can be nested. |
| * When the outer transaction is ended all of |
| * the work done in that transaction and all of the nested transactions will be committed or |
| * rolled back. The changes will be rolled back if any transaction is ended without being |
| * marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed. |
| * </p> |
| * <p>Here is the standard idiom for transactions: |
| * |
| * <pre> |
| * db.beginTransactionWithListener(listener); |
| * try { |
| * ... |
| * db.setTransactionSuccessful(); |
| * } finally { |
| * db.endTransaction(); |
| * } |
| * </pre> |
| * |
| * @param transactionListener listener that should be notified when the transaction begins, |
| * commits, or is rolled back, either explicitly or by a call to |
| * {@link #yieldIfContendedSafely}. |
| */ |
| public void beginTransactionWithListener(SQLiteTransactionListener transactionListener) { |
| beginTransaction(transactionListener, true); |
| } |
| |
| /** |
| * Begins a transaction in IMMEDIATE mode. Transactions can be nested. When |
| * the outer transaction is ended all of the work done in that transaction |
| * and all of the nested transactions will be committed or rolled back. The |
| * changes will be rolled back if any transaction is ended without being |
| * marked as clean (by calling setTransactionSuccessful). Otherwise they |
| * will be committed. |
| * <p> |
| * Here is the standard idiom for transactions: |
| * |
| * <pre> |
| * db.beginTransactionWithListenerNonExclusive(listener); |
| * try { |
| * ... |
| * db.setTransactionSuccessful(); |
| * } finally { |
| * db.endTransaction(); |
| * } |
| * </pre> |
| * |
| * @param transactionListener listener that should be notified when the |
| * transaction begins, commits, or is rolled back, either |
| * explicitly or by a call to {@link #yieldIfContendedSafely}. |
| */ |
| public void beginTransactionWithListenerNonExclusive( |
| SQLiteTransactionListener transactionListener) { |
| beginTransaction(transactionListener, false); |
| } |
| |
| private void beginTransaction(SQLiteTransactionListener transactionListener, |
| boolean exclusive) { |
| acquireReference(); |
| try { |
| getThreadSession().beginTransaction( |
| exclusive ? SQLiteSession.TRANSACTION_MODE_EXCLUSIVE : |
| SQLiteSession.TRANSACTION_MODE_IMMEDIATE, |
| transactionListener, |
| getThreadDefaultConnectionFlags(false /*readOnly*/), null); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * End a transaction. See beginTransaction for notes about how to use this and when transactions |
| * are committed and rolled back. |
| */ |
| public void endTransaction() { |
| acquireReference(); |
| try { |
| getThreadSession().endTransaction(null); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Marks the current transaction as successful. Do not do any more database work between |
| * calling this and calling endTransaction. Do as little non-database work as possible in that |
| * situation too. If any errors are encountered between this and endTransaction the transaction |
| * will still be committed. |
| * |
| * @throws IllegalStateException if the current thread is not in a transaction or the |
| * transaction is already marked as successful. |
| */ |
| public void setTransactionSuccessful() { |
| acquireReference(); |
| try { |
| getThreadSession().setTransactionSuccessful(); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Returns true if the current thread has a transaction pending. |
| * |
| * @return True if the current thread is in a transaction. |
| */ |
| public boolean inTransaction() { |
| acquireReference(); |
| try { |
| return getThreadSession().hasTransaction(); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Returns true if the current thread is holding an active connection to the database. |
| * <p> |
| * The name of this method comes from a time when having an active connection |
| * to the database meant that the thread was holding an actual lock on the |
| * database. Nowadays, there is no longer a true "database lock" although threads |
| * may block if they cannot acquire a database connection to perform a |
| * particular operation. |
| * </p> |
| * |
| * @return True if the current thread is holding an active connection to the database. |
| */ |
| public boolean isDbLockedByCurrentThread() { |
| acquireReference(); |
| try { |
| return getThreadSession().hasConnection(); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Always returns false. |
| * <p> |
| * There is no longer the concept of a database lock, so this method always returns false. |
| * </p> |
| * |
| * @return False. |
| * @deprecated Always returns false. Do not use this method. |
| */ |
| @Deprecated |
| public boolean isDbLockedByOtherThreads() { |
| return false; |
| } |
| |
| /** |
| * Temporarily end the transaction to let other threads run. The transaction is assumed to be |
| * successful so far. Do not call setTransactionSuccessful before calling this. When this |
| * returns a new transaction will have been created but not marked as successful. |
| * @return true if the transaction was yielded |
| * @deprecated if the db is locked more than once (becuase of nested transactions) then the lock |
| * will not be yielded. Use yieldIfContendedSafely instead. |
| */ |
| @Deprecated |
| public boolean yieldIfContended() { |
| return yieldIfContendedHelper(false /* do not check yielding */, |
| -1 /* sleepAfterYieldDelay */); |
| } |
| |
| /** |
| * Temporarily end the transaction to let other threads run. The transaction is assumed to be |
| * successful so far. Do not call setTransactionSuccessful before calling this. When this |
| * returns a new transaction will have been created but not marked as successful. This assumes |
| * that there are no nested transactions (beginTransaction has only been called once) and will |
| * throw an exception if that is not the case. |
| * @return true if the transaction was yielded |
| */ |
| public boolean yieldIfContendedSafely() { |
| return yieldIfContendedHelper(true /* check yielding */, -1 /* sleepAfterYieldDelay*/); |
| } |
| |
| /** |
| * Temporarily end the transaction to let other threads run. The transaction is assumed to be |
| * successful so far. Do not call setTransactionSuccessful before calling this. When this |
| * returns a new transaction will have been created but not marked as successful. This assumes |
| * that there are no nested transactions (beginTransaction has only been called once) and will |
| * throw an exception if that is not the case. |
| * @param sleepAfterYieldDelay if > 0, sleep this long before starting a new transaction if |
| * the lock was actually yielded. This will allow other background threads to make some |
| * more progress than they would if we started the transaction immediately. |
| * @return true if the transaction was yielded |
| */ |
| public boolean yieldIfContendedSafely(long sleepAfterYieldDelay) { |
| return yieldIfContendedHelper(true /* check yielding */, sleepAfterYieldDelay); |
| } |
| |
| private boolean yieldIfContendedHelper(boolean throwIfUnsafe, long sleepAfterYieldDelay) { |
| acquireReference(); |
| try { |
| return getThreadSession().yieldTransaction(sleepAfterYieldDelay, throwIfUnsafe, null); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Deprecated. |
| * @deprecated This method no longer serves any useful purpose and has been deprecated. |
| */ |
| @Deprecated |
| public Map<String, String> getSyncedTables() { |
| return new HashMap<String, String>(0); |
| } |
| |
| /** |
| * Open the database according to the flags {@link #OPEN_READWRITE} |
| * {@link #OPEN_READONLY} {@link #CREATE_IF_NECESSARY} and/or {@link #NO_LOCALIZED_COLLATORS}. |
| * |
| * <p>Sets the locale of the database to the the system's current locale. |
| * Call {@link #setLocale} if you would like something else.</p> |
| * |
| * @param path to database file to open and/or create |
| * @param factory an optional factory class that is called to instantiate a |
| * cursor when query is called, or null for default |
| * @param flags to control database access mode |
| * @return the newly opened database |
| * @throws SQLiteException if the database cannot be opened |
| */ |
| public static SQLiteDatabase openDatabase(String path, CursorFactory factory, int flags) { |
| return openDatabase(path, factory, flags, null); |
| } |
| |
| /** |
| * Open the database according to the flags {@link #OPEN_READWRITE} |
| * {@link #OPEN_READONLY} {@link #CREATE_IF_NECESSARY} and/or {@link #NO_LOCALIZED_COLLATORS}. |
| * |
| * <p>Sets the locale of the database to the the system's current locale. |
| * Call {@link #setLocale} if you would like something else.</p> |
| * |
| * <p>Accepts input param: a concrete instance of {@link DatabaseErrorHandler} to be |
| * used to handle corruption when sqlite reports database corruption.</p> |
| * |
| * @param path to database file to open and/or create |
| * @param factory an optional factory class that is called to instantiate a |
| * cursor when query is called, or null for default |
| * @param flags to control database access mode |
| * @param errorHandler the {@link DatabaseErrorHandler} obj to be used to handle corruption |
| * when sqlite reports database corruption |
| * @return the newly opened database |
| * @throws SQLiteException if the database cannot be opened |
| */ |
| public static SQLiteDatabase openDatabase(String path, CursorFactory factory, int flags, |
| DatabaseErrorHandler errorHandler) { |
| SQLiteDatabase db = new SQLiteDatabase(path, flags, factory, errorHandler); |
| db.open(); |
| return db; |
| } |
| |
| /** |
| * Equivalent to openDatabase(file.getPath(), factory, CREATE_IF_NECESSARY). |
| */ |
| public static SQLiteDatabase openOrCreateDatabase(File file, CursorFactory factory) { |
| return openOrCreateDatabase(file.getPath(), factory); |
| } |
| |
| /** |
| * Equivalent to openDatabase(path, factory, CREATE_IF_NECESSARY). |
| */ |
| public static SQLiteDatabase openOrCreateDatabase(String path, CursorFactory factory) { |
| return openDatabase(path, factory, CREATE_IF_NECESSARY, null); |
| } |
| |
| /** |
| * Equivalent to openDatabase(path, factory, CREATE_IF_NECESSARY, errorHandler). |
| */ |
| public static SQLiteDatabase openOrCreateDatabase(String path, CursorFactory factory, |
| DatabaseErrorHandler errorHandler) { |
| return openDatabase(path, factory, CREATE_IF_NECESSARY, errorHandler); |
| } |
| |
| /** |
| * Deletes a database including its journal file and other auxiliary files |
| * that may have been created by the database engine. |
| * |
| * @param file The database file path. |
| * @return True if the database was successfully deleted. |
| */ |
| public static boolean deleteDatabase(File file) { |
| if (file == null) { |
| throw new IllegalArgumentException("file must not be null"); |
| } |
| |
| boolean deleted = false; |
| deleted |= file.delete(); |
| deleted |= new File(file.getPath() + "-journal").delete(); |
| deleted |= new File(file.getPath() + "-shm").delete(); |
| deleted |= new File(file.getPath() + "-wal").delete(); |
| |
| File dir = file.getParentFile(); |
| if (dir != null) { |
| final String prefix = file.getName() + "-mj"; |
| File[] files = dir.listFiles(new FileFilter() { |
| @Override |
| public boolean accept(File candidate) { |
| return candidate.getName().startsWith(prefix); |
| } |
| }); |
| if (files != null) { |
| for (File masterJournal : files) { |
| deleted |= masterJournal.delete(); |
| } |
| } |
| } |
| return deleted; |
| } |
| |
| /** |
| * Reopens the database in read-write mode. |
| * If the database is already read-write, does nothing. |
| * |
| * @throws SQLiteException if the database could not be reopened as requested, in which |
| * case it remains open in read only mode. |
| * @throws IllegalStateException if the database is not open. |
| * |
| * @see #isReadOnly() |
| * @hide |
| */ |
| public void reopenReadWrite() { |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| if (!isReadOnlyLocked()) { |
| return; // nothing to do |
| } |
| |
| // Reopen the database in read-write mode. |
| final int oldOpenFlags = mConfigurationLocked.openFlags; |
| mConfigurationLocked.openFlags = (mConfigurationLocked.openFlags & ~OPEN_READ_MASK) |
| | OPEN_READWRITE; |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.openFlags = oldOpenFlags; |
| throw ex; |
| } |
| } |
| } |
| |
| private void open() { |
| try { |
| try { |
| openInner(); |
| } catch (SQLiteDatabaseCorruptException ex) { |
| onCorruption(); |
| openInner(); |
| } |
| } catch (SQLiteException ex) { |
| Log.e(TAG, "Failed to open database '" + getLabel() + "'.", ex); |
| close(); |
| throw ex; |
| } |
| } |
| |
| private void openInner() { |
| synchronized (mLock) { |
| assert mConnectionPoolLocked == null; |
| mConnectionPoolLocked = SQLiteConnectionPool.open(mConfigurationLocked); |
| mCloseGuardLocked.open("close"); |
| } |
| |
| synchronized (sActiveDatabases) { |
| sActiveDatabases.put(this, null); |
| } |
| } |
| |
| /** |
| * Create a memory backed SQLite database. Its contents will be destroyed |
| * when the database is closed. |
| * |
| * <p>Sets the locale of the database to the the system's current locale. |
| * Call {@link #setLocale} if you would like something else.</p> |
| * |
| * @param factory an optional factory class that is called to instantiate a |
| * cursor when query is called |
| * @return a SQLiteDatabase object, or null if the database can't be created |
| */ |
| public static SQLiteDatabase create(CursorFactory factory) { |
| // This is a magic string with special meaning for SQLite. |
| return openDatabase(SQLiteDatabaseConfiguration.MEMORY_DB_PATH, |
| factory, CREATE_IF_NECESSARY); |
| } |
| |
| /** |
| * Registers a CustomFunction callback as a function that can be called from |
| * SQLite database triggers. |
| * |
| * @param name the name of the sqlite3 function |
| * @param numArgs the number of arguments for the function |
| * @param function callback to call when the function is executed |
| * @hide |
| */ |
| public void addCustomFunction(String name, int numArgs, CustomFunction function) { |
| // Create wrapper (also validates arguments). |
| SQLiteCustomFunction wrapper = new SQLiteCustomFunction(name, numArgs, function); |
| |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| mConfigurationLocked.customFunctions.add(wrapper); |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.customFunctions.remove(wrapper); |
| throw ex; |
| } |
| } |
| } |
| |
| /** |
| * Gets the database version. |
| * |
| * @return the database version |
| */ |
| public int getVersion() { |
| return ((Long) DatabaseUtils.longForQuery(this, "PRAGMA user_version;", null)).intValue(); |
| } |
| |
| /** |
| * Sets the database version. |
| * |
| * @param version the new database version |
| */ |
| public void setVersion(int version) { |
| execSQL("PRAGMA user_version = " + version); |
| } |
| |
| /** |
| * Returns the maximum size the database may grow to. |
| * |
| * @return the new maximum database size |
| */ |
| public long getMaximumSize() { |
| long pageCount = DatabaseUtils.longForQuery(this, "PRAGMA max_page_count;", null); |
| return pageCount * getPageSize(); |
| } |
| |
| /** |
| * Sets the maximum size the database will grow to. The maximum size cannot |
| * be set below the current size. |
| * |
| * @param numBytes the maximum database size, in bytes |
| * @return the new maximum database size |
| */ |
| public long setMaximumSize(long numBytes) { |
| long pageSize = getPageSize(); |
| long numPages = numBytes / pageSize; |
| // If numBytes isn't a multiple of pageSize, bump up a page |
| if ((numBytes % pageSize) != 0) { |
| numPages++; |
| } |
| long newPageCount = DatabaseUtils.longForQuery(this, "PRAGMA max_page_count = " + numPages, |
| null); |
| return newPageCount * pageSize; |
| } |
| |
| /** |
| * Returns the current database page size, in bytes. |
| * |
| * @return the database page size, in bytes |
| */ |
| public long getPageSize() { |
| return DatabaseUtils.longForQuery(this, "PRAGMA page_size;", null); |
| } |
| |
| /** |
| * Sets the database page size. The page size must be a power of two. This |
| * method does not work if any data has been written to the database file, |
| * and must be called right after the database has been created. |
| * |
| * @param numBytes the database page size, in bytes |
| */ |
| public void setPageSize(long numBytes) { |
| execSQL("PRAGMA page_size = " + numBytes); |
| } |
| |
| /** |
| * Mark this table as syncable. When an update occurs in this table the |
| * _sync_dirty field will be set to ensure proper syncing operation. |
| * |
| * @param table the table to mark as syncable |
| * @param deletedTable The deleted table that corresponds to the |
| * syncable table |
| * @deprecated This method no longer serves any useful purpose and has been deprecated. |
| */ |
| @Deprecated |
| public void markTableSyncable(String table, String deletedTable) { |
| } |
| |
| /** |
| * Mark this table as syncable, with the _sync_dirty residing in another |
| * table. When an update occurs in this table the _sync_dirty field of the |
| * row in updateTable with the _id in foreignKey will be set to |
| * ensure proper syncing operation. |
| * |
| * @param table an update on this table will trigger a sync time removal |
| * @param foreignKey this is the column in table whose value is an _id in |
| * updateTable |
| * @param updateTable this is the table that will have its _sync_dirty |
| * @deprecated This method no longer serves any useful purpose and has been deprecated. |
| */ |
| @Deprecated |
| public void markTableSyncable(String table, String foreignKey, String updateTable) { |
| } |
| |
| /** |
| * Finds the name of the first table, which is editable. |
| * |
| * @param tables a list of tables |
| * @return the first table listed |
| */ |
| public static String findEditTable(String tables) { |
| if (!TextUtils.isEmpty(tables)) { |
| // find the first word terminated by either a space or a comma |
| int spacepos = tables.indexOf(' '); |
| int commapos = tables.indexOf(','); |
| |
| if (spacepos > 0 && (spacepos < commapos || commapos < 0)) { |
| return tables.substring(0, spacepos); |
| } else if (commapos > 0 && (commapos < spacepos || spacepos < 0) ) { |
| return tables.substring(0, commapos); |
| } |
| return tables; |
| } else { |
| throw new IllegalStateException("Invalid tables"); |
| } |
| } |
| |
| /** |
| * Compiles an SQL statement into a reusable pre-compiled statement object. |
| * The parameters are identical to {@link #execSQL(String)}. You may put ?s in the |
| * statement and fill in those values with {@link SQLiteProgram#bindString} |
| * and {@link SQLiteProgram#bindLong} each time you want to run the |
| * statement. Statements may not return result sets larger than 1x1. |
| *<p> |
| * No two threads should be using the same {@link SQLiteStatement} at the same time. |
| * |
| * @param sql The raw SQL statement, may contain ? for unknown values to be |
| * bound later. |
| * @return A pre-compiled {@link SQLiteStatement} object. Note that |
| * {@link SQLiteStatement}s are not synchronized, see the documentation for more details. |
| */ |
| public SQLiteStatement compileStatement(String sql) throws SQLException { |
| acquireReference(); |
| try { |
| return new SQLiteStatement(this, sql, null); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Query the given URL, returning a {@link Cursor} over the result set. |
| * |
| * @param distinct true if you want each row to be unique, false otherwise. |
| * @param table The table name to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, formatted as an |
| * SQL WHERE clause (excluding the WHERE itself). Passing null |
| * will return all rows for the given table. |
| * @param selectionArgs You may include ?s in selection, which will be |
| * replaced by the values from selectionArgs, in order that they |
| * appear in the selection. The values will be bound as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * GROUP BY clause (excluding the GROUP BY itself). Passing null |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL HAVING |
| * clause (excluding the HAVING itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL ORDER BY clause |
| * (excluding the ORDER BY itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as LIMIT clause. Passing null denotes no LIMIT clause. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| * @see Cursor |
| */ |
| public Cursor query(boolean distinct, String table, String[] columns, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String orderBy, String limit) { |
| return queryWithFactory(null, distinct, table, columns, selection, selectionArgs, |
| groupBy, having, orderBy, limit, null); |
| } |
| |
| /** |
| * Query the given URL, returning a {@link Cursor} over the result set. |
| * |
| * @param distinct true if you want each row to be unique, false otherwise. |
| * @param table The table name to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, formatted as an |
| * SQL WHERE clause (excluding the WHERE itself). Passing null |
| * will return all rows for the given table. |
| * @param selectionArgs You may include ?s in selection, which will be |
| * replaced by the values from selectionArgs, in order that they |
| * appear in the selection. The values will be bound as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * GROUP BY clause (excluding the GROUP BY itself). Passing null |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL HAVING |
| * clause (excluding the HAVING itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL ORDER BY clause |
| * (excluding the ORDER BY itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as LIMIT clause. Passing null denotes no LIMIT clause. |
| * @param cancellationSignal A signal to cancel the operation in progress, or null if none. |
| * If the operation is canceled, then {@link OperationCanceledException} will be thrown |
| * when the query is executed. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| * @see Cursor |
| */ |
| public Cursor query(boolean distinct, String table, String[] columns, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String orderBy, String limit, CancellationSignal cancellationSignal) { |
| return queryWithFactory(null, distinct, table, columns, selection, selectionArgs, |
| groupBy, having, orderBy, limit, cancellationSignal); |
| } |
| |
| /** |
| * Query the given URL, returning a {@link Cursor} over the result set. |
| * |
| * @param cursorFactory the cursor factory to use, or null for the default factory |
| * @param distinct true if you want each row to be unique, false otherwise. |
| * @param table The table name to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, formatted as an |
| * SQL WHERE clause (excluding the WHERE itself). Passing null |
| * will return all rows for the given table. |
| * @param selectionArgs You may include ?s in selection, which will be |
| * replaced by the values from selectionArgs, in order that they |
| * appear in the selection. The values will be bound as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * GROUP BY clause (excluding the GROUP BY itself). Passing null |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL HAVING |
| * clause (excluding the HAVING itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL ORDER BY clause |
| * (excluding the ORDER BY itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as LIMIT clause. Passing null denotes no LIMIT clause. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| * @see Cursor |
| */ |
| public Cursor queryWithFactory(CursorFactory cursorFactory, |
| boolean distinct, String table, String[] columns, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String orderBy, String limit) { |
| return queryWithFactory(cursorFactory, distinct, table, columns, selection, |
| selectionArgs, groupBy, having, orderBy, limit, null); |
| } |
| |
| /** |
| * Query the given URL, returning a {@link Cursor} over the result set. |
| * |
| * @param cursorFactory the cursor factory to use, or null for the default factory |
| * @param distinct true if you want each row to be unique, false otherwise. |
| * @param table The table name to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, formatted as an |
| * SQL WHERE clause (excluding the WHERE itself). Passing null |
| * will return all rows for the given table. |
| * @param selectionArgs You may include ?s in selection, which will be |
| * replaced by the values from selectionArgs, in order that they |
| * appear in the selection. The values will be bound as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * GROUP BY clause (excluding the GROUP BY itself). Passing null |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL HAVING |
| * clause (excluding the HAVING itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL ORDER BY clause |
| * (excluding the ORDER BY itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as LIMIT clause. Passing null denotes no LIMIT clause. |
| * @param cancellationSignal A signal to cancel the operation in progress, or null if none. |
| * If the operation is canceled, then {@link OperationCanceledException} will be thrown |
| * when the query is executed. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| * @see Cursor |
| */ |
| public Cursor queryWithFactory(CursorFactory cursorFactory, |
| boolean distinct, String table, String[] columns, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String orderBy, String limit, CancellationSignal cancellationSignal) { |
| acquireReference(); |
| try { |
| String sql = SQLiteQueryBuilder.buildQueryString( |
| distinct, table, columns, selection, groupBy, having, orderBy, limit); |
| |
| return rawQueryWithFactory(cursorFactory, sql, selectionArgs, |
| findEditTable(table), cancellationSignal); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Query the given table, returning a {@link Cursor} over the result set. |
| * |
| * @param table The table name to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, formatted as an |
| * SQL WHERE clause (excluding the WHERE itself). Passing null |
| * will return all rows for the given table. |
| * @param selectionArgs You may include ?s in selection, which will be |
| * replaced by the values from selectionArgs, in order that they |
| * appear in the selection. The values will be bound as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * GROUP BY clause (excluding the GROUP BY itself). Passing null |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL HAVING |
| * clause (excluding the HAVING itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL ORDER BY clause |
| * (excluding the ORDER BY itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| * @see Cursor |
| */ |
| public Cursor query(String table, String[] columns, String selection, |
| String[] selectionArgs, String groupBy, String having, |
| String orderBy) { |
| |
| return query(false, table, columns, selection, selectionArgs, groupBy, |
| having, orderBy, null /* limit */); |
| } |
| |
| /** |
| * Query the given table, returning a {@link Cursor} over the result set. |
| * |
| * @param table The table name to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, formatted as an |
| * SQL WHERE clause (excluding the WHERE itself). Passing null |
| * will return all rows for the given table. |
| * @param selectionArgs You may include ?s in selection, which will be |
| * replaced by the values from selectionArgs, in order that they |
| * appear in the selection. The values will be bound as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * GROUP BY clause (excluding the GROUP BY itself). Passing null |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL HAVING |
| * clause (excluding the HAVING itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL ORDER BY clause |
| * (excluding the ORDER BY itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as LIMIT clause. Passing null denotes no LIMIT clause. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| * @see Cursor |
| */ |
| public Cursor query(String table, String[] columns, String selection, |
| String[] selectionArgs, String groupBy, String having, |
| String orderBy, String limit) { |
| |
| return query(false, table, columns, selection, selectionArgs, groupBy, |
| having, orderBy, limit); |
| } |
| |
| /** |
| * Runs the provided SQL and returns a {@link Cursor} over the result set. |
| * |
| * @param sql the SQL query. The SQL string must not be ; terminated |
| * @param selectionArgs You may include ?s in where clause in the query, |
| * which will be replaced by the values from selectionArgs. The |
| * values will be bound as Strings. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| */ |
| public Cursor rawQuery(String sql, String[] selectionArgs) { |
| return rawQueryWithFactory(null, sql, selectionArgs, null, null); |
| } |
| |
| /** |
| * Runs the provided SQL and returns a {@link Cursor} over the result set. |
| * |
| * @param sql the SQL query. The SQL string must not be ; terminated |
| * @param selectionArgs You may include ?s in where clause in the query, |
| * which will be replaced by the values from selectionArgs. The |
| * values will be bound as Strings. |
| * @param cancellationSignal A signal to cancel the operation in progress, or null if none. |
| * If the operation is canceled, then {@link OperationCanceledException} will be thrown |
| * when the query is executed. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| */ |
| public Cursor rawQuery(String sql, String[] selectionArgs, |
| CancellationSignal cancellationSignal) { |
| return rawQueryWithFactory(null, sql, selectionArgs, null, cancellationSignal); |
| } |
| |
| /** |
| * Runs the provided SQL and returns a cursor over the result set. |
| * |
| * @param cursorFactory the cursor factory to use, or null for the default factory |
| * @param sql the SQL query. The SQL string must not be ; terminated |
| * @param selectionArgs You may include ?s in where clause in the query, |
| * which will be replaced by the values from selectionArgs. The |
| * values will be bound as Strings. |
| * @param editTable the name of the first table, which is editable |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| */ |
| public Cursor rawQueryWithFactory( |
| CursorFactory cursorFactory, String sql, String[] selectionArgs, |
| String editTable) { |
| return rawQueryWithFactory(cursorFactory, sql, selectionArgs, editTable, null); |
| } |
| |
| /** |
| * Runs the provided SQL and returns a cursor over the result set. |
| * |
| * @param cursorFactory the cursor factory to use, or null for the default factory |
| * @param sql the SQL query. The SQL string must not be ; terminated |
| * @param selectionArgs You may include ?s in where clause in the query, |
| * which will be replaced by the values from selectionArgs. The |
| * values will be bound as Strings. |
| * @param editTable the name of the first table, which is editable |
| * @param cancellationSignal A signal to cancel the operation in progress, or null if none. |
| * If the operation is canceled, then {@link OperationCanceledException} will be thrown |
| * when the query is executed. |
| * @return A {@link Cursor} object, which is positioned before the first entry. Note that |
| * {@link Cursor}s are not synchronized, see the documentation for more details. |
| */ |
| public Cursor rawQueryWithFactory( |
| CursorFactory cursorFactory, String sql, String[] selectionArgs, |
| String editTable, CancellationSignal cancellationSignal) { |
| acquireReference(); |
| try { |
| SQLiteCursorDriver driver = new SQLiteDirectCursorDriver(this, sql, editTable, |
| cancellationSignal); |
| return driver.query(cursorFactory != null ? cursorFactory : mCursorFactory, |
| selectionArgs); |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Convenience method for inserting a row into the database. |
| * |
| * @param table the table to insert the row into |
| * @param nullColumnHack optional; may be <code>null</code>. |
| * SQL doesn't allow inserting a completely empty row without |
| * naming at least one column name. If your provided <code>values</code> is |
| * empty, no column names are known and an empty row can't be inserted. |
| * If not set to null, the <code>nullColumnHack</code> parameter |
| * provides the name of nullable column name to explicitly insert a NULL into |
| * in the case where your <code>values</code> is empty. |
| * @param values this map contains the initial column values for the |
| * row. The keys should be the column names and the values the |
| * column values |
| * @return the row ID of the newly inserted row, or -1 if an error occurred |
| */ |
| public long insert(String table, String nullColumnHack, ContentValues values) { |
| try { |
| return insertWithOnConflict(table, nullColumnHack, values, CONFLICT_NONE); |
| } catch (SQLException e) { |
| Log.e(TAG, "Error inserting " + values, e); |
| return -1; |
| } |
| } |
| |
| /** |
| * Convenience method for inserting a row into the database. |
| * |
| * @param table the table to insert the row into |
| * @param nullColumnHack optional; may be <code>null</code>. |
| * SQL doesn't allow inserting a completely empty row without |
| * naming at least one column name. If your provided <code>values</code> is |
| * empty, no column names are known and an empty row can't be inserted. |
| * If not set to null, the <code>nullColumnHack</code> parameter |
| * provides the name of nullable column name to explicitly insert a NULL into |
| * in the case where your <code>values</code> is empty. |
| * @param values this map contains the initial column values for the |
| * row. The keys should be the column names and the values the |
| * column values |
| * @throws SQLException |
| * @return the row ID of the newly inserted row, or -1 if an error occurred |
| */ |
| public long insertOrThrow(String table, String nullColumnHack, ContentValues values) |
| throws SQLException { |
| return insertWithOnConflict(table, nullColumnHack, values, CONFLICT_NONE); |
| } |
| |
| /** |
| * Convenience method for replacing a row in the database. |
| * |
| * @param table the table in which to replace the row |
| * @param nullColumnHack optional; may be <code>null</code>. |
| * SQL doesn't allow inserting a completely empty row without |
| * naming at least one column name. If your provided <code>initialValues</code> is |
| * empty, no column names are known and an empty row can't be inserted. |
| * If not set to null, the <code>nullColumnHack</code> parameter |
| * provides the name of nullable column name to explicitly insert a NULL into |
| * in the case where your <code>initialValues</code> is empty. |
| * @param initialValues this map contains the initial column values for |
| * the row. |
| * @return the row ID of the newly inserted row, or -1 if an error occurred |
| */ |
| public long replace(String table, String nullColumnHack, ContentValues initialValues) { |
| try { |
| return insertWithOnConflict(table, nullColumnHack, initialValues, |
| CONFLICT_REPLACE); |
| } catch (SQLException e) { |
| Log.e(TAG, "Error inserting " + initialValues, e); |
| return -1; |
| } |
| } |
| |
| /** |
| * Convenience method for replacing a row in the database. |
| * |
| * @param table the table in which to replace the row |
| * @param nullColumnHack optional; may be <code>null</code>. |
| * SQL doesn't allow inserting a completely empty row without |
| * naming at least one column name. If your provided <code>initialValues</code> is |
| * empty, no column names are known and an empty row can't be inserted. |
| * If not set to null, the <code>nullColumnHack</code> parameter |
| * provides the name of nullable column name to explicitly insert a NULL into |
| * in the case where your <code>initialValues</code> is empty. |
| * @param initialValues this map contains the initial column values for |
| * the row. The key |
| * @throws SQLException |
| * @return the row ID of the newly inserted row, or -1 if an error occurred |
| */ |
| public long replaceOrThrow(String table, String nullColumnHack, |
| ContentValues initialValues) throws SQLException { |
| return insertWithOnConflict(table, nullColumnHack, initialValues, |
| CONFLICT_REPLACE); |
| } |
| |
| /** |
| * General method for inserting a row into the database. |
| * |
| * @param table the table to insert the row into |
| * @param nullColumnHack optional; may be <code>null</code>. |
| * SQL doesn't allow inserting a completely empty row without |
| * naming at least one column name. If your provided <code>initialValues</code> is |
| * empty, no column names are known and an empty row can't be inserted. |
| * If not set to null, the <code>nullColumnHack</code> parameter |
| * provides the name of nullable column name to explicitly insert a NULL into |
| * in the case where your <code>initialValues</code> is empty. |
| * @param initialValues this map contains the initial column values for the |
| * row. The keys should be the column names and the values the |
| * column values |
| * @param conflictAlgorithm for insert conflict resolver |
| * @return the row ID of the newly inserted row OR <code>-1</code> if either the |
| * input parameter <code>conflictAlgorithm</code> = {@link #CONFLICT_IGNORE} |
| * or an error occurred. |
| */ |
| public long insertWithOnConflict(String table, String nullColumnHack, |
| ContentValues initialValues, int conflictAlgorithm) { |
| acquireReference(); |
| try { |
| StringBuilder sql = new StringBuilder(); |
| sql.append("INSERT"); |
| sql.append(CONFLICT_VALUES[conflictAlgorithm]); |
| sql.append(" INTO "); |
| sql.append(table); |
| sql.append('('); |
| |
| Object[] bindArgs = null; |
| int size = (initialValues != null && initialValues.size() > 0) |
| ? initialValues.size() : 0; |
| if (size > 0) { |
| bindArgs = new Object[size]; |
| int i = 0; |
| for (String colName : initialValues.keySet()) { |
| sql.append((i > 0) ? "," : ""); |
| sql.append(colName); |
| bindArgs[i++] = initialValues.get(colName); |
| } |
| sql.append(')'); |
| sql.append(" VALUES ("); |
| for (i = 0; i < size; i++) { |
| sql.append((i > 0) ? ",?" : "?"); |
| } |
| } else { |
| sql.append(nullColumnHack + ") VALUES (NULL"); |
| } |
| sql.append(')'); |
| |
| SQLiteStatement statement = new SQLiteStatement(this, sql.toString(), bindArgs); |
| try { |
| return statement.executeInsert(); |
| } finally { |
| statement.close(); |
| } |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Convenience method for deleting rows in the database. |
| * |
| * @param table the table to delete from |
| * @param whereClause the optional WHERE clause to apply when deleting. |
| * Passing null will delete all rows. |
| * @param whereArgs You may include ?s in the where clause, which |
| * will be replaced by the values from whereArgs. The values |
| * will be bound as Strings. |
| * @return the number of rows affected if a whereClause is passed in, 0 |
| * otherwise. To remove all rows and get a count pass "1" as the |
| * whereClause. |
| */ |
| public int delete(String table, String whereClause, String[] whereArgs) { |
| acquireReference(); |
| try { |
| SQLiteStatement statement = new SQLiteStatement(this, "DELETE FROM " + table + |
| (!TextUtils.isEmpty(whereClause) ? " WHERE " + whereClause : ""), whereArgs); |
| try { |
| return statement.executeUpdateDelete(); |
| } finally { |
| statement.close(); |
| } |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Convenience method for updating rows in the database. |
| * |
| * @param table the table to update in |
| * @param values a map from column names to new column values. null is a |
| * valid value that will be translated to NULL. |
| * @param whereClause the optional WHERE clause to apply when updating. |
| * Passing null will update all rows. |
| * @param whereArgs You may include ?s in the where clause, which |
| * will be replaced by the values from whereArgs. The values |
| * will be bound as Strings. |
| * @return the number of rows affected |
| */ |
| public int update(String table, ContentValues values, String whereClause, String[] whereArgs) { |
| return updateWithOnConflict(table, values, whereClause, whereArgs, CONFLICT_NONE); |
| } |
| |
| /** |
| * Convenience method for updating rows in the database. |
| * |
| * @param table the table to update in |
| * @param values a map from column names to new column values. null is a |
| * valid value that will be translated to NULL. |
| * @param whereClause the optional WHERE clause to apply when updating. |
| * Passing null will update all rows. |
| * @param whereArgs You may include ?s in the where clause, which |
| * will be replaced by the values from whereArgs. The values |
| * will be bound as Strings. |
| * @param conflictAlgorithm for update conflict resolver |
| * @return the number of rows affected |
| */ |
| public int updateWithOnConflict(String table, ContentValues values, |
| String whereClause, String[] whereArgs, int conflictAlgorithm) { |
| if (values == null || values.size() == 0) { |
| throw new IllegalArgumentException("Empty values"); |
| } |
| |
| acquireReference(); |
| try { |
| StringBuilder sql = new StringBuilder(120); |
| sql.append("UPDATE "); |
| sql.append(CONFLICT_VALUES[conflictAlgorithm]); |
| sql.append(table); |
| sql.append(" SET "); |
| |
| // move all bind args to one array |
| int setValuesSize = values.size(); |
| int bindArgsSize = (whereArgs == null) ? setValuesSize : (setValuesSize + whereArgs.length); |
| Object[] bindArgs = new Object[bindArgsSize]; |
| int i = 0; |
| for (String colName : values.keySet()) { |
| sql.append((i > 0) ? "," : ""); |
| sql.append(colName); |
| bindArgs[i++] = values.get(colName); |
| sql.append("=?"); |
| } |
| if (whereArgs != null) { |
| for (i = setValuesSize; i < bindArgsSize; i++) { |
| bindArgs[i] = whereArgs[i - setValuesSize]; |
| } |
| } |
| if (!TextUtils.isEmpty(whereClause)) { |
| sql.append(" WHERE "); |
| sql.append(whereClause); |
| } |
| |
| SQLiteStatement statement = new SQLiteStatement(this, sql.toString(), bindArgs); |
| try { |
| return statement.executeUpdateDelete(); |
| } finally { |
| statement.close(); |
| } |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Execute a single SQL statement that is NOT a SELECT |
| * or any other SQL statement that returns data. |
| * <p> |
| * It has no means to return any data (such as the number of affected rows). |
| * Instead, you're encouraged to use {@link #insert(String, String, ContentValues)}, |
| * {@link #update(String, ContentValues, String, String[])}, et al, when possible. |
| * </p> |
| * <p> |
| * When using {@link #enableWriteAheadLogging()}, journal_mode is |
| * automatically managed by this class. So, do not set journal_mode |
| * using "PRAGMA journal_mode'<value>" statement if your app is using |
| * {@link #enableWriteAheadLogging()} |
| * </p> |
| * |
| * @param sql the SQL statement to be executed. Multiple statements separated by semicolons are |
| * not supported. |
| * @throws SQLException if the SQL string is invalid |
| */ |
| public void execSQL(String sql) throws SQLException { |
| executeSql(sql, null); |
| } |
| |
| /** |
| * Execute a single SQL statement that is NOT a SELECT/INSERT/UPDATE/DELETE. |
| * <p> |
| * For INSERT statements, use any of the following instead. |
| * <ul> |
| * <li>{@link #insert(String, String, ContentValues)}</li> |
| * <li>{@link #insertOrThrow(String, String, ContentValues)}</li> |
| * <li>{@link #insertWithOnConflict(String, String, ContentValues, int)}</li> |
| * </ul> |
| * <p> |
| * For UPDATE statements, use any of the following instead. |
| * <ul> |
| * <li>{@link #update(String, ContentValues, String, String[])}</li> |
| * <li>{@link #updateWithOnConflict(String, ContentValues, String, String[], int)}</li> |
| * </ul> |
| * <p> |
| * For DELETE statements, use any of the following instead. |
| * <ul> |
| * <li>{@link #delete(String, String, String[])}</li> |
| * </ul> |
| * <p> |
| * For example, the following are good candidates for using this method: |
| * <ul> |
| * <li>ALTER TABLE</li> |
| * <li>CREATE or DROP table / trigger / view / index / virtual table</li> |
| * <li>REINDEX</li> |
| * <li>RELEASE</li> |
| * <li>SAVEPOINT</li> |
| * <li>PRAGMA that returns no data</li> |
| * </ul> |
| * </p> |
| * <p> |
| * When using {@link #enableWriteAheadLogging()}, journal_mode is |
| * automatically managed by this class. So, do not set journal_mode |
| * using "PRAGMA journal_mode'<value>" statement if your app is using |
| * {@link #enableWriteAheadLogging()} |
| * </p> |
| * |
| * @param sql the SQL statement to be executed. Multiple statements separated by semicolons are |
| * not supported. |
| * @param bindArgs only byte[], String, Long and Double are supported in bindArgs. |
| * @throws SQLException if the SQL string is invalid |
| */ |
| public void execSQL(String sql, Object[] bindArgs) throws SQLException { |
| if (bindArgs == null) { |
| throw new IllegalArgumentException("Empty bindArgs"); |
| } |
| executeSql(sql, bindArgs); |
| } |
| |
| private int executeSql(String sql, Object[] bindArgs) throws SQLException { |
| acquireReference(); |
| try { |
| if (DatabaseUtils.getSqlStatementType(sql) == DatabaseUtils.STATEMENT_ATTACH) { |
| boolean disableWal = false; |
| synchronized (mLock) { |
| if (!mHasAttachedDbsLocked) { |
| mHasAttachedDbsLocked = true; |
| disableWal = true; |
| } |
| } |
| if (disableWal) { |
| disableWriteAheadLogging(); |
| } |
| } |
| |
| SQLiteStatement statement = new SQLiteStatement(this, sql, bindArgs); |
| try { |
| return statement.executeUpdateDelete(); |
| } finally { |
| statement.close(); |
| } |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Verifies that a SQL SELECT statement is valid by compiling it. |
| * If the SQL statement is not valid, this method will throw a {@link SQLiteException}. |
| * |
| * @param sql SQL to be validated |
| * @param cancellationSignal A signal to cancel the operation in progress, or null if none. |
| * If the operation is canceled, then {@link OperationCanceledException} will be thrown |
| * when the query is executed. |
| * @throws SQLiteException if {@code sql} is invalid |
| */ |
| public void validateSql(@NonNull String sql, @Nullable CancellationSignal cancellationSignal) { |
| getThreadSession().prepare(sql, |
| getThreadDefaultConnectionFlags(/* readOnly =*/ true), cancellationSignal, null); |
| } |
| |
| /** |
| * Returns true if the database is opened as read only. |
| * |
| * @return True if database is opened as read only. |
| */ |
| public boolean isReadOnly() { |
| synchronized (mLock) { |
| return isReadOnlyLocked(); |
| } |
| } |
| |
| private boolean isReadOnlyLocked() { |
| return (mConfigurationLocked.openFlags & OPEN_READ_MASK) == OPEN_READONLY; |
| } |
| |
| /** |
| * Returns true if the database is in-memory db. |
| * |
| * @return True if the database is in-memory. |
| * @hide |
| */ |
| public boolean isInMemoryDatabase() { |
| synchronized (mLock) { |
| return mConfigurationLocked.isInMemoryDb(); |
| } |
| } |
| |
| /** |
| * Returns true if the database is currently open. |
| * |
| * @return True if the database is currently open (has not been closed). |
| */ |
| public boolean isOpen() { |
| synchronized (mLock) { |
| return mConnectionPoolLocked != null; |
| } |
| } |
| |
| /** |
| * Returns true if the new version code is greater than the current database version. |
| * |
| * @param newVersion The new version code. |
| * @return True if the new version code is greater than the current database version. |
| */ |
| public boolean needUpgrade(int newVersion) { |
| return newVersion > getVersion(); |
| } |
| |
| /** |
| * Gets the path to the database file. |
| * |
| * @return The path to the database file. |
| */ |
| public final String getPath() { |
| synchronized (mLock) { |
| return mConfigurationLocked.path; |
| } |
| } |
| |
| /** |
| * Sets the locale for this database. Does nothing if this database has |
| * the {@link #NO_LOCALIZED_COLLATORS} flag set or was opened read only. |
| * |
| * @param locale The new locale. |
| * |
| * @throws SQLException if the locale could not be set. The most common reason |
| * for this is that there is no collator available for the locale you requested. |
| * In this case the database remains unchanged. |
| */ |
| public void setLocale(Locale locale) { |
| if (locale == null) { |
| throw new IllegalArgumentException("locale must not be null."); |
| } |
| |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| final Locale oldLocale = mConfigurationLocked.locale; |
| mConfigurationLocked.locale = locale; |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.locale = oldLocale; |
| throw ex; |
| } |
| } |
| } |
| |
| /** |
| * Sets the maximum size of the prepared-statement cache for this database. |
| * (size of the cache = number of compiled-sql-statements stored in the cache). |
| *<p> |
| * Maximum cache size can ONLY be increased from its current size (default = 10). |
| * If this method is called with smaller size than the current maximum value, |
| * then IllegalStateException is thrown. |
| *<p> |
| * This method is thread-safe. |
| * |
| * @param cacheSize the size of the cache. can be (0 to {@link #MAX_SQL_CACHE_SIZE}) |
| * @throws IllegalStateException if input cacheSize > {@link #MAX_SQL_CACHE_SIZE}. |
| */ |
| public void setMaxSqlCacheSize(int cacheSize) { |
| if (cacheSize > MAX_SQL_CACHE_SIZE || cacheSize < 0) { |
| throw new IllegalStateException( |
| "expected value between 0 and " + MAX_SQL_CACHE_SIZE); |
| } |
| |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| final int oldMaxSqlCacheSize = mConfigurationLocked.maxSqlCacheSize; |
| mConfigurationLocked.maxSqlCacheSize = cacheSize; |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.maxSqlCacheSize = oldMaxSqlCacheSize; |
| throw ex; |
| } |
| } |
| } |
| |
| /** |
| * Sets whether foreign key constraints are enabled for the database. |
| * <p> |
| * By default, foreign key constraints are not enforced by the database. |
| * This method allows an application to enable foreign key constraints. |
| * It must be called each time the database is opened to ensure that foreign |
| * key constraints are enabled for the session. |
| * </p><p> |
| * A good time to call this method is right after calling {@link #openOrCreateDatabase} |
| * or in the {@link SQLiteOpenHelper#onConfigure} callback. |
| * </p><p> |
| * When foreign key constraints are disabled, the database does not check whether |
| * changes to the database will violate foreign key constraints. Likewise, when |
| * foreign key constraints are disabled, the database will not execute cascade |
| * delete or update triggers. As a result, it is possible for the database |
| * state to become inconsistent. To perform a database integrity check, |
| * call {@link #isDatabaseIntegrityOk}. |
| * </p><p> |
| * This method must not be called while a transaction is in progress. |
| * </p><p> |
| * See also <a href="http://sqlite.org/foreignkeys.html">SQLite Foreign Key Constraints</a> |
| * for more details about foreign key constraint support. |
| * </p> |
| * |
| * @param enable True to enable foreign key constraints, false to disable them. |
| * |
| * @throws IllegalStateException if the are transactions is in progress |
| * when this method is called. |
| */ |
| public void setForeignKeyConstraintsEnabled(boolean enable) { |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| if (mConfigurationLocked.foreignKeyConstraintsEnabled == enable) { |
| return; |
| } |
| |
| mConfigurationLocked.foreignKeyConstraintsEnabled = enable; |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.foreignKeyConstraintsEnabled = !enable; |
| throw ex; |
| } |
| } |
| } |
| |
| /** |
| * This method enables parallel execution of queries from multiple threads on the |
| * same database. It does this by opening multiple connections to the database |
| * and using a different database connection for each query. The database |
| * journal mode is also changed to enable writes to proceed concurrently with reads. |
| * <p> |
| * When write-ahead logging is not enabled (the default), it is not possible for |
| * reads and writes to occur on the database at the same time. Before modifying the |
| * database, the writer implicitly acquires an exclusive lock on the database which |
| * prevents readers from accessing the database until the write is completed. |
| * </p><p> |
| * In contrast, when write-ahead logging is enabled (by calling this method), write |
| * operations occur in a separate log file which allows reads to proceed concurrently. |
| * While a write is in progress, readers on other threads will perceive the state |
| * of the database as it was before the write began. When the write completes, readers |
| * on other threads will then perceive the new state of the database. |
| * </p><p> |
| * It is a good idea to enable write-ahead logging whenever a database will be |
| * concurrently accessed and modified by multiple threads at the same time. |
| * However, write-ahead logging uses significantly more memory than ordinary |
| * journaling because there are multiple connections to the same database. |
| * So if a database will only be used by a single thread, or if optimizing |
| * concurrency is not very important, then write-ahead logging should be disabled. |
| * </p><p> |
| * After calling this method, execution of queries in parallel is enabled as long as |
| * the database remains open. To disable execution of queries in parallel, either |
| * call {@link #disableWriteAheadLogging} or close the database and reopen it. |
| * </p><p> |
| * The maximum number of connections used to execute queries in parallel is |
| * dependent upon the device memory and possibly other properties. |
| * </p><p> |
| * If a query is part of a transaction, then it is executed on the same database handle the |
| * transaction was begun. |
| * </p><p> |
| * Writers should use {@link #beginTransactionNonExclusive()} or |
| * {@link #beginTransactionWithListenerNonExclusive(SQLiteTransactionListener)} |
| * to start a transaction. Non-exclusive mode allows database file to be in readable |
| * by other threads executing queries. |
| * </p><p> |
| * If the database has any attached databases, then execution of queries in parallel is NOT |
| * possible. Likewise, write-ahead logging is not supported for read-only databases |
| * or memory databases. In such cases, {@link #enableWriteAheadLogging} returns false. |
| * </p><p> |
| * The best way to enable write-ahead logging is to pass the |
| * {@link #ENABLE_WRITE_AHEAD_LOGGING} flag to {@link #openDatabase}. This is |
| * more efficient than calling {@link #enableWriteAheadLogging}. |
| * <code><pre> |
| * SQLiteDatabase db = SQLiteDatabase.openDatabase("db_filename", cursorFactory, |
| * SQLiteDatabase.CREATE_IF_NECESSARY | SQLiteDatabase.ENABLE_WRITE_AHEAD_LOGGING, |
| * myDatabaseErrorHandler); |
| * db.enableWriteAheadLogging(); |
| * </pre></code> |
| * </p><p> |
| * Another way to enable write-ahead logging is to call {@link #enableWriteAheadLogging} |
| * after opening the database. |
| * <code><pre> |
| * SQLiteDatabase db = SQLiteDatabase.openDatabase("db_filename", cursorFactory, |
| * SQLiteDatabase.CREATE_IF_NECESSARY, myDatabaseErrorHandler); |
| * db.enableWriteAheadLogging(); |
| * </pre></code> |
| * </p><p> |
| * See also <a href="http://sqlite.org/wal.html">SQLite Write-Ahead Logging</a> for |
| * more details about how write-ahead logging works. |
| * </p> |
| * |
| * @return True if write-ahead logging is enabled. |
| * |
| * @throws IllegalStateException if there are transactions in progress at the |
| * time this method is called. WAL mode can only be changed when there are no |
| * transactions in progress. |
| * |
| * @see #ENABLE_WRITE_AHEAD_LOGGING |
| * @see #disableWriteAheadLogging |
| */ |
| public boolean enableWriteAheadLogging() { |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| if ((mConfigurationLocked.openFlags & ENABLE_WRITE_AHEAD_LOGGING) != 0) { |
| return true; |
| } |
| |
| if (isReadOnlyLocked()) { |
| // WAL doesn't make sense for readonly-databases. |
| // TODO: True, but connection pooling does still make sense... |
| return false; |
| } |
| |
| if (mConfigurationLocked.isInMemoryDb()) { |
| Log.i(TAG, "can't enable WAL for memory databases."); |
| return false; |
| } |
| |
| // make sure this database has NO attached databases because sqlite's write-ahead-logging |
| // doesn't work for databases with attached databases |
| if (mHasAttachedDbsLocked) { |
| if (Log.isLoggable(TAG, Log.DEBUG)) { |
| Log.d(TAG, "this database: " + mConfigurationLocked.label |
| + " has attached databases. can't enable WAL."); |
| } |
| return false; |
| } |
| |
| mConfigurationLocked.openFlags |= ENABLE_WRITE_AHEAD_LOGGING; |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.openFlags &= ~ENABLE_WRITE_AHEAD_LOGGING; |
| throw ex; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * This method disables the features enabled by {@link #enableWriteAheadLogging()}. |
| * |
| * @throws IllegalStateException if there are transactions in progress at the |
| * time this method is called. WAL mode can only be changed when there are no |
| * transactions in progress. |
| * |
| * @see #enableWriteAheadLogging |
| */ |
| public void disableWriteAheadLogging() { |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| if ((mConfigurationLocked.openFlags & ENABLE_WRITE_AHEAD_LOGGING) == 0) { |
| return; |
| } |
| |
| mConfigurationLocked.openFlags &= ~ENABLE_WRITE_AHEAD_LOGGING; |
| try { |
| mConnectionPoolLocked.reconfigure(mConfigurationLocked); |
| } catch (RuntimeException ex) { |
| mConfigurationLocked.openFlags |= ENABLE_WRITE_AHEAD_LOGGING; |
| throw ex; |
| } |
| } |
| } |
| |
| /** |
| * Returns true if write-ahead logging has been enabled for this database. |
| * |
| * @return True if write-ahead logging has been enabled for this database. |
| * |
| * @see #enableWriteAheadLogging |
| * @see #ENABLE_WRITE_AHEAD_LOGGING |
| */ |
| public boolean isWriteAheadLoggingEnabled() { |
| synchronized (mLock) { |
| throwIfNotOpenLocked(); |
| |
| return (mConfigurationLocked.openFlags & ENABLE_WRITE_AHEAD_LOGGING) != 0; |
| } |
| } |
| |
| /** |
| * Collect statistics about all open databases in the current process. |
| * Used by bug report. |
| */ |
| static ArrayList<DbStats> getDbStats() { |
| ArrayList<DbStats> dbStatsList = new ArrayList<DbStats>(); |
| for (SQLiteDatabase db : getActiveDatabases()) { |
| db.collectDbStats(dbStatsList); |
| } |
| return dbStatsList; |
| } |
| |
| private void collectDbStats(ArrayList<DbStats> dbStatsList) { |
| synchronized (mLock) { |
| if (mConnectionPoolLocked != null) { |
| mConnectionPoolLocked.collectDbStats(dbStatsList); |
| } |
| } |
| } |
| |
| private static ArrayList<SQLiteDatabase> getActiveDatabases() { |
| ArrayList<SQLiteDatabase> databases = new ArrayList<SQLiteDatabase>(); |
| synchronized (sActiveDatabases) { |
| databases.addAll(sActiveDatabases.keySet()); |
| } |
| return databases; |
| } |
| |
| /** |
| * Dump detailed information about all open databases in the current process. |
| * Used by bug report. |
| */ |
| static void dumpAll(Printer printer, boolean verbose) { |
| for (SQLiteDatabase db : getActiveDatabases()) { |
| db.dump(printer, verbose); |
| } |
| } |
| |
| private void dump(Printer printer, boolean verbose) { |
| synchronized (mLock) { |
| if (mConnectionPoolLocked != null) { |
| printer.println(""); |
| mConnectionPoolLocked.dump(printer, verbose); |
| } |
| } |
| } |
| |
| /** |
| * Returns list of full pathnames of all attached databases including the main database |
| * by executing 'pragma database_list' on the database. |
| * |
| * @return ArrayList of pairs of (database name, database file path) or null if the database |
| * is not open. |
| */ |
| public List<Pair<String, String>> getAttachedDbs() { |
| ArrayList<Pair<String, String>> attachedDbs = new ArrayList<Pair<String, String>>(); |
| synchronized (mLock) { |
| if (mConnectionPoolLocked == null) { |
| return null; // not open |
| } |
| |
| if (!mHasAttachedDbsLocked) { |
| // No attached databases. |
| // There is a small window where attached databases exist but this flag is not |
| // set yet. This can occur when this thread is in a race condition with another |
| // thread that is executing the SQL statement: "attach database <blah> as <foo>" |
| // If this thread is NOT ok with such a race condition (and thus possibly not |
| // receivethe entire list of attached databases), then the caller should ensure |
| // that no thread is executing any SQL statements while a thread is calling this |
| // method. Typically, this method is called when 'adb bugreport' is done or the |
| // caller wants to collect stats on the database and all its attached databases. |
| attachedDbs.add(new Pair<String, String>("main", mConfigurationLocked.path)); |
| return attachedDbs; |
| } |
| |
| acquireReference(); |
| } |
| |
| try { |
| // has attached databases. query sqlite to get the list of attached databases. |
| Cursor c = null; |
| try { |
| c = rawQuery("pragma database_list;", null); |
| while (c.moveToNext()) { |
| // sqlite returns a row for each database in the returned list of databases. |
| // in each row, |
| // 1st column is the database name such as main, or the database |
| // name specified on the "ATTACH" command |
| // 2nd column is the database file path. |
| attachedDbs.add(new Pair<String, String>(c.getString(1), c.getString(2))); |
| } |
| } finally { |
| if (c != null) { |
| c.close(); |
| } |
| } |
| return attachedDbs; |
| } finally { |
| releaseReference(); |
| } |
| } |
| |
| /** |
| * Runs 'pragma integrity_check' on the given database (and all the attached databases) |
| * and returns true if the given database (and all its attached databases) pass integrity_check, |
| * false otherwise. |
| *<p> |
| * If the result is false, then this method logs the errors reported by the integrity_check |
| * command execution. |
| *<p> |
| * Note that 'pragma integrity_check' on a database can take a long time. |
| * |
| * @return true if the given database (and all its attached databases) pass integrity_check, |
| * false otherwise. |
| */ |
| public boolean isDatabaseIntegrityOk() { |
| acquireReference(); |
| try { |
| List<Pair<String, String>> attachedDbs = null; |
| try { |
| attachedDbs = getAttachedDbs(); |
| if (attachedDbs == null) { |
| throw new IllegalStateException("databaselist for: " + getPath() + " couldn't " + |
| "be retrieved. probably because the database is closed"); |
| } |
| } catch (SQLiteException e) { |
| // can't get attachedDb list. do integrity check on the main database |
| attachedDbs = new ArrayList<Pair<String, String>>(); |
| attachedDbs.add(new Pair<String, String>("main", getPath())); |
| } |
| |
| for (int i = 0; i < attachedDbs.size(); i++) { |
| Pair<String, String> p = attachedDbs.get(i); |
| SQLiteStatement prog = null; |
| try { |
| prog = compileStatement("PRAGMA " + p.first + ".integrity_check(1);"); |
| String rslt = prog.simpleQueryForString(); |
| if (!rslt.equalsIgnoreCase("ok")) { |
| // integrity_checker failed on main or attached databases |
| Log.e(TAG, "PRAGMA integrity_check on " + p.second + " returned: " + rslt); |
| return false; |
| } |
| } finally { |
| if (prog != null) prog.close(); |
| } |
| } |
| } finally { |
| releaseReference(); |
| } |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "SQLiteDatabase: " + getPath(); |
| } |
| |
| private void throwIfNotOpenLocked() { |
| if (mConnectionPoolLocked == null) { |
| throw new IllegalStateException("The database '" + mConfigurationLocked.label |
| + "' is not open."); |
| } |
| } |
| |
| /** |
| * Used to allow returning sub-classes of {@link Cursor} when calling query. |
| */ |
| public interface CursorFactory { |
| /** |
| * See {@link SQLiteCursor#SQLiteCursor(SQLiteCursorDriver, String, SQLiteQuery)}. |
| */ |
| public Cursor newCursor(SQLiteDatabase db, |
| SQLiteCursorDriver masterQuery, String editTable, |
| SQLiteQuery query); |
| } |
| |
| /** |
| * A callback interface for a custom sqlite3 function. |
| * This can be used to create a function that can be called from |
| * sqlite3 database triggers. |
| * @hide |
| */ |
| public interface CustomFunction { |
| public void callback(String[] args); |
| } |
| } |