| /* |
| * Copyright (C) 2017 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 com.example.android.contentprovidersample.data; |
| |
| import android.arch.persistence.room.Dao; |
| import android.arch.persistence.room.Insert; |
| import android.arch.persistence.room.Query; |
| import android.arch.persistence.room.Update; |
| import android.database.Cursor; |
| |
| |
| /** |
| * Data access object for Cheese. |
| */ |
| @Dao |
| public interface CheeseDao { |
| |
| /** |
| * Counts the number of cheeses in the table. |
| * |
| * @return The number of cheeses. |
| */ |
| @Query("SELECT COUNT(*) FROM " + Cheese.TABLE_NAME) |
| int count(); |
| |
| /** |
| * Inserts a cheese into the table. |
| * |
| * @param cheese A new cheese. |
| * @return The row ID of the newly inserted cheese. |
| */ |
| @Insert |
| long insert(Cheese cheese); |
| |
| /** |
| * Inserts multiple cheeses into the database |
| * |
| * @param cheeses An array of new cheeses. |
| * @return The row IDs of the newly inserted cheeses. |
| */ |
| @Insert |
| long[] insertAll(Cheese[] cheeses); |
| |
| /** |
| * Select all cheeses. |
| * |
| * @return A {@link Cursor} of all the cheeses in the table. |
| */ |
| @Query("SELECT * FROM " + Cheese.TABLE_NAME) |
| Cursor selectAll(); |
| |
| /** |
| * Select a cheese by the ID. |
| * |
| * @param id The row ID. |
| * @return A {@link Cursor} of the selected cheese. |
| */ |
| @Query("SELECT * FROM " + Cheese.TABLE_NAME + " WHERE " + Cheese.COLUMN_ID + " = :id") |
| Cursor selectById(long id); |
| |
| /** |
| * Delete a cheese by the ID. |
| * |
| * @param id The row ID. |
| * @return A number of cheeses deleted. This should always be {@code 1}. |
| */ |
| @Query("DELETE FROM " + Cheese.TABLE_NAME + " WHERE " + Cheese.COLUMN_ID + " = :id") |
| int deleteById(long id); |
| |
| /** |
| * Update the cheese. The cheese is identified by the row ID. |
| * |
| * @param cheese The cheese to update. |
| * @return A number of cheeses updated. This should always be {@code 1}. |
| */ |
| @Update |
| int update(Cheese cheese); |
| |
| } |