J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.sql.rowset; |
| 27 | |
| 28 | import java.sql.*; |
| 29 | import javax.sql.*; |
| 30 | import javax.naming.*; |
| 31 | import java.io.*; |
| 32 | import java.math.*; |
| 33 | import java.util.*; |
| 34 | |
| 35 | import javax.sql.rowset.*; |
| 36 | |
| 37 | /** |
| 38 | * The <code>JoinRowSet</code> interface provides a mechanism for combining related |
| 39 | * data from different <code>RowSet</code> objects into one <code>JoinRowSet</code> |
| 40 | * object, which represents an SQL <code>JOIN</code>. |
| 41 | * In other words, a <code>JoinRowSet</code> object acts as a |
| 42 | * container for the data from <code>RowSet</code> objects that form an SQL |
| 43 | * <code>JOIN</code> relationship. |
| 44 | * <P> |
| 45 | * The <code>Joinable</code> interface provides the methods for setting, |
| 46 | * retrieving, and unsetting a match column, the basis for |
| 47 | * establishing an SQL <code>JOIN</code> relationship. The match column may |
| 48 | * alternatively be set by supplying it to the appropriate version of the |
| 49 | * <code>JointRowSet</code> method <code>addRowSet</code>. |
| 50 | * <P> |
| 51 | * <p> |
| 52 | * <h3>1.0 Overview</h3> |
| 53 | * Disconnected <code>RowSet</code> objects (<code>CachedRowSet</code> objects |
| 54 | * and implementations extending the <code>CachedRowSet</code> interface) |
| 55 | * do not have a standard way to establish an SQL <code>JOIN</code> between |
| 56 | * <code>RowSet</code> objects without the expensive operation of |
| 57 | * reconnecting to the data source. The <code>JoinRowSet</code> |
| 58 | * interface is specifically designed to address this need. |
| 59 | * <P> |
| 60 | * Any <code>RowSet</code> object |
| 61 | * can be added to a <code>JoinRowSet</code> object to become |
| 62 | * part of an SQL <code>JOIN</code> relationship. This means that both connected |
| 63 | * and disconnected <code>RowSet</code> objects can be part of a <code>JOIN</code>. |
| 64 | * <code>RowSet</code> objects operating in a connected environment |
| 65 | * (<code>JdbcRowSet</code> objects) are |
| 66 | * encouraged to use the database to which they are already |
| 67 | * connected to establish SQL <code>JOIN</code> relationships between |
| 68 | * tables directly. However, it is possible for a |
| 69 | * <code>JdbcRowSet</code> object to be added to a <code>JoinRowSet</code> object |
| 70 | * if necessary. |
| 71 | * <P> |
| 72 | * Any number of <code>RowSet</code> objects can be added to an |
| 73 | * instance of <code>JoinRowSet</code> provided that they |
| 74 | * can be related in an SQL <code>JOIN</code>. |
| 75 | * By definition, the SQL <code>JOIN</code> statement is used to |
| 76 | * combine the data contained in two or more relational database tables based |
| 77 | * upon a common attribute. The <code>Joinable</code> interface provides the methods |
| 78 | * for establishing a common attribute, which is done by setting a |
| 79 | * <i>match column</i>. The match column commonly coincides with |
| 80 | * the primary key, but there is |
| 81 | * no requirement that the match column be the same as the primary key. |
| 82 | * By establishing and then enforcing column matches, |
| 83 | * a <code>JoinRowSet</code> object establishes <code>JOIN</code> relationships |
| 84 | * between <code>RowSet</code> objects without the assistance of an available |
| 85 | * relational database. |
| 86 | * <P> |
| 87 | * The type of <code>JOIN</code> to be established is determined by setting |
| 88 | * one of the <code>JoinRowSet</code> constants using the method |
| 89 | * <code>setJoinType</code>. The following SQL <code>JOIN</code> types can be set: |
| 90 | * <UL> |
| 91 | * <LI><code>CROSS_JOIN</code> |
| 92 | * <LI><code>FULL_JOIN</code> |
| 93 | * <LI><code>INNER_JOIN</code> - the default if no <code>JOIN</code> type has been set |
| 94 | * <LI><code>LEFT_OUTER_JOIN</code> |
| 95 | * <LI><code>RIGHT_OUTER_JOIN</code> |
| 96 | * </UL> |
| 97 | * Note that if no type is set, the <code>JOIN</code> will automatically be an |
| 98 | * inner join. The comments for the fields in the |
| 99 | * <code>JoinRowSet</code> interface explain these <code>JOIN</code> types, which are |
| 100 | * standard SQL <code>JOIN</code> types. |
| 101 | * <P> |
| 102 | * <h3>2.0 Using a <code>JoinRowSet</code> Object for Creating a <code>JOIN</code></h3> |
| 103 | * When a <code>JoinRowSet</code> object is created, it is empty. |
| 104 | * The first <code>RowSet</code> object to be added becomes the basis for the |
| 105 | * <code>JOIN</code> relationship. |
| 106 | * Applications must determine which column in each of the |
| 107 | * <code>RowSet</code> objects to be added to the <code>JoinRowSet</code> object |
| 108 | * should be the match column. All of the |
| 109 | * <code>RowSet</code> objects must contain a match column, and the values in |
| 110 | * each match column must be ones that can be compared to values in the other match |
| 111 | * columns. The columns do not have to have the same name, though they often do, |
| 112 | * and they do not have to store the exact same data type as long as the data types |
| 113 | * can be compared. |
| 114 | * <P> |
| 115 | * A match column can be be set in two ways: |
| 116 | * <ul> |
| 117 | * <li>By calling the <code>Joinable</code> method <code>setMatchColumn</code><br> |
| 118 | * This is the only method that can set the match column before a <code>RowSet</code> |
| 119 | * object is added to a <code>JoinRowSet</code> object. The <code>RowSet</code> object |
| 120 | * must have implemented the <code>Joinable</code> interface in order to use the method |
| 121 | * <code>setMatchColumn</code>. Once the match column value |
| 122 | * has been set, this method can be used to reset the match column at any time. |
| 123 | * <li>By calling one of the versions of the <code>JoinRowSet</code> method |
| 124 | * <code>addRowSet</code> that takes a column name or number (or an array of |
| 125 | * column names or numbers)<BR> |
| 126 | * Four of the five <code>addRowSet</code> methods take a match column as a parameter. |
| 127 | * These four methods set or reset the match column at the time a <code>RowSet</code> |
| 128 | * object is being added to a <code>JoinRowSet</code> object. |
| 129 | * </ul> |
| 130 | * <h3>3.0 Sample Usage</h3> |
| 131 | * <p> |
| 132 | * The following code fragment adds two <code>CachedRowSet</code> |
| 133 | * objects to a <code>JoinRowSet</code> object. Note that in this example, |
| 134 | * no SQL <code>JOIN</code> type is set, so the default <code>JOIN</code> type, |
| 135 | * which is <i>INNER_JOIN</i>, is established. |
| 136 | * <p> |
| 137 | * In the following code fragment, the table <code>EMPLOYEES</code>, whose match |
| 138 | * column is set to the first column (<code>EMP_ID</code>), is added to the |
| 139 | * <code>JoinRowSet</code> object <i>jrs</i>. Then |
| 140 | * the table <code>ESSP_BONUS_PLAN</code>, whose match column is likewise |
| 141 | * the <code>EMP_ID</code> column, is added. When this second |
| 142 | * table is added to <i>jrs</i>, only the rows in |
| 143 | * <code>ESSP_BONUS_PLAN</code> whose <code>EMP_ID</code> value matches an |
| 144 | * <code>EMP_ID</code> value in the <code>EMPLOYEES</code> table are added. |
| 145 | * In this case, everyone in the bonus plan is an employee, so all of the rows |
| 146 | * in the table <code>ESSP_BONUS_PLAN</code> are added to the <code>JoinRowSet</code> |
| 147 | * object. In this example, both <code>CachedRowSet</code> objects being added |
| 148 | * have implemented the <code>Joinable</code> interface and can therefore call |
| 149 | * the <code>Joinable</code> method <code>setMatchColumn</code>. |
| 150 | * <PRE> |
| 151 | * JoinRowSet jrs = new JoinRowSetImpl(); |
| 152 | * |
| 153 | * ResultSet rs1 = stmt.executeQuery("SELECT * FROM EMPLOYEES"); |
| 154 | * CachedRowSet empl = new CachedRowSetImpl(); |
| 155 | * empl.populate(rs1); |
| 156 | * empl.setMatchColumn(1); |
| 157 | * jrs.addRowSet(empl); |
| 158 | * |
| 159 | * ResultSet rs2 = stmt.executeQuery("SELECT * FROM ESSP_BONUS_PLAN"); |
| 160 | * CachedRowSet bonus = new CachedRowSetImpl(); |
| 161 | * bonus.populate(rs2); |
| 162 | * bonus.setMatchColumn(1); // EMP_ID is the first column |
| 163 | * jrs.addRowSet(bonus); |
| 164 | * </PRE> |
| 165 | * <P> |
| 166 | * At this point, <i>jrs</i> is an inside JOIN of the two <code>RowSet</code> objects |
| 167 | * based on their <code>EMP_ID</code> columns. The application can now browse the |
| 168 | * combined data as if it were browsing one single <code>RowSet</code> object. |
| 169 | * Because <i>jrs</i> is itself a <code>RowSet</code> object, an application can |
| 170 | * navigate or modify it using <code>RowSet</code> methods. |
| 171 | * <PRE> |
| 172 | * jrs.first(); |
| 173 | * int employeeID = jrs.getInt(1); |
| 174 | * String employeeName = jrs.getString(2); |
| 175 | * </PRE> |
| 176 | * <P> |
| 177 | * Note that because the SQL <code>JOIN</code> must be enforced when an application |
| 178 | * adds a second or subsequent <code>RowSet</code> object, there |
| 179 | * may be an initial degradation in performance while the <code>JOIN</code> is |
| 180 | * being performed. |
| 181 | * <P> |
| 182 | * The following code fragment adds an additional <code>CachedRowSet</code> object. |
| 183 | * In this case, the match column (<code>EMP_ID</code>) is set when the |
| 184 | * <code>CachedRowSet</code> object is added to the <code>JoinRowSet</code> object. |
| 185 | * <PRE> |
| 186 | * ResultSet rs3 = stmt.executeQuery("SELECT * FROM 401K_CONTRIB"); |
| 187 | * CachedRowSet fourO1k = new CachedRowSetImpl(); |
| 188 | * four01k.populate(rs3); |
| 189 | * jrs.addRowSet(four01k, 1); |
| 190 | * </PRE> |
| 191 | * <P> |
| 192 | * The <code>JoinRowSet</code> object <i>jrs</i> now contains values from all three |
| 193 | * tables. The data in each row in <i>four01k</i> in which the value for the |
| 194 | * <code>EMP_ID</code> column matches a value for the <code>EMP_ID</code> column |
| 195 | * in <i>jrs</i> has been added to <i>jrs</i>. |
| 196 | * <P> |
| 197 | * <h3>4.0 <code>JoinRowSet</code> Methods</h3> |
| 198 | * The <code>JoinRowSet</code> interface supplies several methods for adding |
| 199 | * <code>RowSet</code> objects and for getting information about the |
| 200 | * <code>JoinRowSet</code> object. |
| 201 | * <UL> |
| 202 | * <LI>Methods for adding one or more <code>RowSet</code> objects<BR> |
| 203 | * These methods allow an application to add one <code>RowSet</code> object |
| 204 | * at a time or to add multiple <code>RowSet</code> objects at one time. In |
| 205 | * either case, the methods may specify the match column for each |
| 206 | * <code>RowSet</code> object being added. |
| 207 | * <LI>Methods for getting information<BR> |
| 208 | * One method retrieves the <code>RowSet</code> objects in the |
| 209 | * <code>JoinRowSet</code> object, and another method retrieves the |
| 210 | * <code>RowSet</code> names. A third method retrieves either the SQL |
| 211 | * <code>WHERE</code> clause used behind the scenes to form the |
| 212 | * <code>JOIN</code> or a text description of what the <code>WHERE</code> |
| 213 | * clause does. |
| 214 | * <LI>Methods related to the type of <code>JOIN</code><BR> |
| 215 | * One method sets the <code>JOIN</code> type, and five methods find out whether |
| 216 | * the <code>JoinRowSet</code> object supports a given type. |
| 217 | * <LI>A method to make a separate copy of the <code>JoinRowSet</code> object<BR> |
| 218 | * This method creates a copy that can be persisted to the data source. |
| 219 | * </UL> |
| 220 | * <P> |
| 221 | */ |
| 222 | |
| 223 | public interface JoinRowSet extends WebRowSet { |
| 224 | |
| 225 | /** |
| 226 | * Adds the given <code>RowSet</code> object to this <code>JoinRowSet</code> |
| 227 | * object. If the <code>RowSet</code> object |
| 228 | * is the first to be added to this <code>JoinRowSet</code> |
| 229 | * object, it forms the basis of the <code>JOIN</code> relationship to be |
| 230 | * established. |
| 231 | * <P> |
| 232 | * This method should be used only when the given <code>RowSet</code> |
| 233 | * object already has a match column that was set with the <code>Joinable</code> |
| 234 | * method <code>setMatchColumn</code>. |
| 235 | * <p> |
| 236 | * Note: A <code>Joinable</code> object is any <code>RowSet</code> object |
| 237 | * that has implemented the <code>Joinable</code> interface. |
| 238 | * |
| 239 | * @param rowset the <code>RowSet</code> object that is to be added to this |
| 240 | * <code>JoinRowSet</code> object; it must implement the |
| 241 | * <code>Joinable</code> interface and have a match column set |
| 242 | * @throws SQLException if (1) an empty rowset is added to the to this |
| 243 | * <code>JoinRowSet</code> object, (2) a match column has not been |
| 244 | * set for <i>rowset</i>, or (3) <i>rowset</i> |
| 245 | * violates the active <code>JOIN</code> |
| 246 | * @see Joinable#setMatchColumn |
| 247 | */ |
| 248 | public void addRowSet(Joinable rowset) throws SQLException; |
| 249 | |
| 250 | /** |
| 251 | * Adds the given <code>RowSet</code> object to this <code>JoinRowSet</code> |
| 252 | * object and sets the designated column as the match column for |
| 253 | * the <code>RowSet</code> object. If the <code>RowSet</code> object |
| 254 | * is the first to be added to this <code>JoinRowSet</code> |
| 255 | * object, it forms the basis of the <code>JOIN</code> relationship to be |
| 256 | * established. |
| 257 | * <P> |
| 258 | * This method should be used when <i>RowSet</i> does not already have a match |
| 259 | * column set. |
| 260 | * |
| 261 | * @param rowset the <code>RowSet</code> object that is to be added to this |
| 262 | * <code>JoinRowSet</code> object; it may implement the |
| 263 | * <code>Joinable</code> interface |
| 264 | * @param columnIdx an <code>int</code> that identifies the column to become the |
| 265 | * match column |
| 266 | * @throws SQLException if (1) <i>rowset</i> is an empty rowset or |
| 267 | * (2) <i>rowset</i> violates the active <code>JOIN</code> |
| 268 | * @see Joinable#unsetMatchColumn |
| 269 | */ |
| 270 | public void addRowSet(RowSet rowset, int columnIdx) throws SQLException; |
| 271 | |
| 272 | /** |
| 273 | * Adds <i>rowset</i> to this <code>JoinRowSet</code> object and |
| 274 | * sets the designated column as the match column. If <i>rowset</i> |
| 275 | * is the first to be added to this <code>JoinRowSet</code> |
| 276 | * object, it forms the basis for the <code>JOIN</code> relationship to be |
| 277 | * established. |
| 278 | * <P> |
| 279 | * This method should be used when the given <code>RowSet</code> object |
| 280 | * does not already have a match column. |
| 281 | * |
| 282 | * @param rowset the <code>RowSet</code> object that is to be added to this |
| 283 | * <code>JoinRowSet</code> object; it may implement the |
| 284 | * <code>Joinable</code> interface |
| 285 | * @param columnName the <code>String</code> object giving the name of the |
| 286 | * column to be set as the match column |
| 287 | * @throws SQLException if (1) <i>rowset</i> is an empty rowset or |
| 288 | * (2) the match column for <i>rowset</i> does not satisfy the |
| 289 | * conditions of the <code>JOIN</code> |
| 290 | */ |
| 291 | public void addRowSet(RowSet rowset, |
| 292 | String columnName) throws SQLException; |
| 293 | |
| 294 | /** |
| 295 | * Adds one or more <code>RowSet</code> objects contained in the given |
| 296 | * array of <code>RowSet</code> objects to this <code>JoinRowSet</code> |
| 297 | * object and sets the match column for |
| 298 | * each of the <code>RowSet</code> objects to the match columns |
| 299 | * in the given array of column indexes. The first element in |
| 300 | * <i>columnIdx</i> is set as the match column for the first |
| 301 | * <code>RowSet</code> object in <i>rowset</i>, the second element of |
| 302 | * <i>columnIdx</i> is set as the match column for the second element |
| 303 | * in <i>rowset</i>, and so on. |
| 304 | * <P> |
| 305 | * The first <code>RowSet</code> object added to this <code>JoinRowSet</code> |
| 306 | * object forms the basis for the <code>JOIN</code> relationship. |
| 307 | * <P> |
| 308 | * This method should be used when the given <code>RowSet</code> object |
| 309 | * does not already have a match column. |
| 310 | * |
| 311 | * @param rowset an array of one or more <code>RowSet</code> objects |
| 312 | * to be added to the <code>JOIN</code>; it may implement the |
| 313 | * <code>Joinable</code> interface |
| 314 | * @param columnIdx an array of <code>int</code> values indicating the index(es) |
| 315 | * of the columns to be set as the match columns for the <code>RowSet</code> |
| 316 | * objects in <i>rowset</i> |
| 317 | * @throws SQLException if (1) an empty rowset is added to this |
| 318 | * <code>JoinRowSet</code> object, (2) a match column is not set |
| 319 | * for a <code>RowSet</code> object in <i>rowset</i>, or (3) |
| 320 | * a <code>RowSet</code> object being added violates the active |
| 321 | * <code>JOIN</code> |
| 322 | */ |
| 323 | public void addRowSet(RowSet[] rowset, |
| 324 | int[] columnIdx) throws SQLException; |
| 325 | |
| 326 | /** |
| 327 | * Adds one or more <code>RowSet</code> objects contained in the given |
| 328 | * array of <code>RowSet</code> objects to this <code>JoinRowSet</code> |
| 329 | * object and sets the match column for |
| 330 | * each of the <code>RowSet</code> objects to the match columns |
| 331 | * in the given array of column names. The first element in |
| 332 | * <i>columnName</i> is set as the match column for the first |
| 333 | * <code>RowSet</code> object in <i>rowset</i>, the second element of |
| 334 | * <i>columnName</i> is set as the match column for the second element |
| 335 | * in <i>rowset</i>, and so on. |
| 336 | * <P> |
| 337 | * The first <code>RowSet</code> object added to this <code>JoinRowSet</code> |
| 338 | * object forms the basis for the <code>JOIN</code> relationship. |
| 339 | * <P> |
| 340 | * This method should be used when the given <code>RowSet</code> object(s) |
| 341 | * does not already have a match column. |
| 342 | * |
| 343 | * @param rowset an array of one or more <code>RowSet</code> objects |
| 344 | * to be added to the <code>JOIN</code>; it may implement the |
| 345 | * <code>Joinable</code> interface |
| 346 | * @param columnName an array of <code>String</code> values indicating the |
| 347 | * names of the columns to be set as the match columns for the |
| 348 | * <code>RowSet</code> objects in <i>rowset</i> |
| 349 | * @throws SQLException if (1) an empty rowset is added to this |
| 350 | * <code>JoinRowSet</code> object, (2) a match column is not set |
| 351 | * for a <code>RowSet</code> object in <i>rowset</i>, or (3) |
| 352 | * a <code>RowSet</code> object being added violates the active |
| 353 | * <code>JOIN</code> |
| 354 | */ |
| 355 | public void addRowSet(RowSet[] rowset, |
| 356 | String[] columnName) throws SQLException; |
| 357 | |
| 358 | /** |
| 359 | * Returns a <code>Collection</code> object containing the |
| 360 | * <code>RowSet</code> objects that have been added to this |
| 361 | * <code>JoinRowSet</code> object. |
| 362 | * This should return the 'n' number of RowSet contained |
| 363 | * within the <code>JOIN</code> and maintain any updates that have occured while in |
| 364 | * this union. |
| 365 | * |
| 366 | * @return a <code>Collection</code> object consisting of the |
| 367 | * <code>RowSet</code> objects added to this <code>JoinRowSet</code> |
| 368 | * object |
| 369 | * @throws SQLException if an error occurs generating the |
| 370 | * <code>Collection</code> object to be returned |
| 371 | */ |
| 372 | public Collection<?> getRowSets() throws java.sql.SQLException; |
| 373 | |
| 374 | /** |
| 375 | * Returns a <code>String</code> array containing the names of the |
| 376 | * <code>RowSet</code> objects added to this <code>JoinRowSet</code> |
| 377 | * object. |
| 378 | * |
| 379 | * @return a <code>String</code> array of the names of the |
| 380 | * <code>RowSet</code> objects in this <code>JoinRowSet</code> |
| 381 | * object |
| 382 | * @throws SQLException if an error occurs retrieving the names of |
| 383 | * the <code>RowSet</code> objects |
| 384 | * @see CachedRowSet#setTableName |
| 385 | */ |
| 386 | public String[] getRowSetNames() throws java.sql.SQLException; |
| 387 | |
| 388 | /** |
| 389 | * Creates a new <code>CachedRowSet</code> object containing the |
| 390 | * data in this <code>JoinRowSet</code> object, which can be saved |
| 391 | * to a data source using the <code>SyncProvider</code> object for |
| 392 | * the <code>CachedRowSet</code> object. |
| 393 | * <P> |
| 394 | * If any updates or modifications have been applied to the JoinRowSet |
| 395 | * the CachedRowSet returned by the method will not be able to persist |
| 396 | * it's changes back to the originating rows and tables in the |
| 397 | * in the datasource. The CachedRowSet instance returned should not |
| 398 | * contain modification data and it should clear all properties of |
| 399 | * it's originating SQL statement. An application should reset the |
| 400 | * SQL statement using the <code>RowSet.setCommand</code> method. |
| 401 | * <p> |
| 402 | * In order to allow changes to be persisted back to the datasource |
| 403 | * to the originating tables, the <code>acceptChanges</code> method |
| 404 | * should be used and called on a JoinRowSet object instance. Implementations |
| 405 | * can leverage the internal data and update tracking in their |
| 406 | * implementations to interact with the SyncProvider to persist any |
| 407 | * changes. |
| 408 | * |
| 409 | * @return a CachedRowSet containing the contents of the JoinRowSet |
| 410 | * @throws SQLException if an error occurs assembling the CachedRowSet |
| 411 | * object |
| 412 | * @see javax.sql.RowSet |
| 413 | * @see javax.sql.rowset.CachedRowSet |
| 414 | * @see javax.sql.rowset.spi.SyncProvider |
| 415 | */ |
| 416 | public CachedRowSet toCachedRowSet() throws java.sql.SQLException; |
| 417 | |
| 418 | /** |
| 419 | * Indicates if CROSS_JOIN is supported by a JoinRowSet |
| 420 | * implementation |
| 421 | * |
| 422 | * @return true if the CROSS_JOIN is supported; false otherwise |
| 423 | */ |
| 424 | public boolean supportsCrossJoin(); |
| 425 | |
| 426 | /** |
| 427 | * Indicates if INNER_JOIN is supported by a JoinRowSet |
| 428 | * implementation |
| 429 | * |
| 430 | * @return true is the INNER_JOIN is supported; false otherwise |
| 431 | */ |
| 432 | public boolean supportsInnerJoin(); |
| 433 | |
| 434 | /** |
| 435 | * Indicates if LEFT_OUTER_JOIN is supported by a JoinRowSet |
| 436 | * implementation |
| 437 | * |
| 438 | * @return true is the LEFT_OUTER_JOIN is supported; false otherwise |
| 439 | */ |
| 440 | public boolean supportsLeftOuterJoin(); |
| 441 | |
| 442 | /** |
| 443 | * Indicates if RIGHT_OUTER_JOIN is supported by a JoinRowSet |
| 444 | * implementation |
| 445 | * |
| 446 | * @return true is the RIGHT_OUTER_JOIN is supported; false otherwise |
| 447 | */ |
| 448 | public boolean supportsRightOuterJoin(); |
| 449 | |
| 450 | /** |
| 451 | * Indicates if FULL_JOIN is supported by a JoinRowSet |
| 452 | * implementation |
| 453 | * |
| 454 | * @return true is the FULL_JOIN is supported; false otherwise |
| 455 | */ |
| 456 | public boolean supportsFullJoin(); |
| 457 | |
| 458 | /** |
| 459 | * Allow the application to adjust the type of <code>JOIN</code> imposed |
| 460 | * on tables contained within the JoinRowSet object instance. |
| 461 | * Implementations should throw a SQLException if they do |
| 462 | * not support a given <code>JOIN</code> type. |
| 463 | * |
| 464 | * @param joinType the standard JoinRowSet.XXX static field definition |
| 465 | * of a SQL <code>JOIN</code> to re-configure a JoinRowSet instance on |
| 466 | * the fly. |
| 467 | * @throws SQLException if an unsupported <code>JOIN</code> type is set |
| 468 | * @see #getJoinType |
| 469 | */ |
| 470 | public void setJoinType(int joinType) throws SQLException; |
| 471 | |
| 472 | /** |
| 473 | * Return a SQL-like description of the WHERE clause being used |
| 474 | * in a JoinRowSet object. An implementation can describe |
| 475 | * the WHERE clause of the SQL <code>JOIN</code> by supplying a SQL |
| 476 | * strings description of <code>JOIN</code> or provide a textual |
| 477 | * description to assist applications using a <code>JoinRowSet</code> |
| 478 | * |
| 479 | * @return whereClause a textual or SQL description of the logical |
| 480 | * WHERE clause used in the JoinRowSet instance |
| 481 | * @throws SQLException if an error occurs in generating a representation |
| 482 | * of the WHERE clause. |
| 483 | */ |
| 484 | public String getWhereClause() throws SQLException; |
| 485 | |
| 486 | /** |
| 487 | * Returns a <code>int</code> describing the set SQL <code>JOIN</code> type |
| 488 | * governing this JoinRowSet instance. The returned type will be one of |
| 489 | * standard JoinRowSet types: <code>CROSS_JOIN</code>, <code>INNER_JOIN</code>, |
| 490 | * <code>LEFT_OUTER_JOIN</code>, <code>RIGHT_OUTER_JOIN</code> or |
| 491 | * <code>FULL_JOIN</code>. |
| 492 | * |
| 493 | * @return joinType one of the standard JoinRowSet static field |
| 494 | * definitions of a SQL <code>JOIN</code>. <code>JoinRowSet.INNER_JOIN</code> |
| 495 | * is returned as the default <code>JOIN</code> type is no type has been |
| 496 | * explicitly set. |
| 497 | * @throws SQLException if an error occurs determining the SQL <code>JOIN</code> |
| 498 | * type supported by the JoinRowSet instance. |
| 499 | * @see #setJoinType |
| 500 | */ |
| 501 | public int getJoinType() throws SQLException; |
| 502 | |
| 503 | /** |
| 504 | * An ANSI-style <code>JOIN</code> providing a cross product of two tables |
| 505 | */ |
| 506 | public static int CROSS_JOIN = 0; |
| 507 | |
| 508 | /** |
| 509 | * An ANSI-style <code>JOIN</code> providing a inner join between two tables. Any |
| 510 | * unmatched rows in either table of the join should be discarded. |
| 511 | */ |
| 512 | public static int INNER_JOIN = 1; |
| 513 | |
| 514 | /** |
| 515 | * An ANSI-style <code>JOIN</code> providing a left outer join between two |
| 516 | * tables. In SQL, this is described where all records should be |
| 517 | * returned from the left side of the JOIN statement. |
| 518 | */ |
| 519 | public static int LEFT_OUTER_JOIN = 2; |
| 520 | |
| 521 | /** |
| 522 | * An ANSI-style <code>JOIN</code> providing a right outer join between |
| 523 | * two tables. In SQL, this is described where all records from the |
| 524 | * table on the right side of the JOIN statement even if the table |
| 525 | * on the left has no matching record. |
| 526 | */ |
| 527 | public static int RIGHT_OUTER_JOIN = 3; |
| 528 | |
| 529 | /** |
| 530 | * An ANSI-style <code>JOIN</code> providing a a full JOIN. Specifies that all |
| 531 | * rows from either table be returned regardless of matching |
| 532 | * records on the other table. |
| 533 | */ |
| 534 | public static int FULL_JOIN = 4; |
| 535 | |
| 536 | |
| 537 | } |