1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package androidx.room; 18 19 import java.lang.annotation.ElementType; 20 import java.lang.annotation.Retention; 21 import java.lang.annotation.RetentionPolicy; 22 import java.lang.annotation.Target; 23 24 /** 25 * Marks the class as a Data Access Object. 26 * <p> 27 * Data Access Objects are the main classes where you define your database interactions. They can 28 * include a variety of query methods. 29 * <p> 30 * The class marked with {@code @Dao} should either be an interface or an abstract class. At compile 31 * time, Room will generate an implementation of this class when it is referenced by a 32 * {@link Database}. 33 * <p> 34 * An abstract {@code @Dao} class can optionally have a constructor that takes a {@link Database} 35 * as its only parameter. 36 * <p> 37 * It is recommended to have multiple {@code Dao} classes in your codebase depending on the tables 38 * they touch. 39 * 40 * @see Query 41 * @see Delete 42 * @see Insert 43 */ 44 @Target(ElementType.TYPE) 45 @Retention(RetentionPolicy.CLASS) 46 public @interface Dao { 47 } 48
