Android Room的使用详解

官网介绍：developer.android.google.cn/training/da…

Room 是在 SQLite 上提供了一个抽象层，以便在充分利用 SQLite 的强大功能的同时，能够流畅地访问数据库。

Room 包含 3 个重要部分：

基本使用步骤：

dependencies { def room_version = '2.2.5' implementation 'androidx.room:room-runtime:$room_version' annotationProcessor 'androidx.room:room-compiler:$room_version' // For Kotlin use kapt instead of annotationProcessor // optional - Kotlin Extensions and Coroutines support for Room implementation 'androidx.room:room-ktx:$room_version' // optional - RxJava support for Room implementation 'androidx.room:room-rxjava2:$room_version' // optional - Guava support for Room, including Optional and ListenableFuture implementation 'androidx.room:room-guava:$room_version' // Test helpers testImplementation 'androidx.room:room-testing:$room_version' }2、创建表

@Entity public class User {@PrimaryKeypublic int uid;@ColumnInfo(name = 'first_name')public String firstName;@ColumnInfo(name = 'last_name')public String lastName; }

参考：developer.android.google.cn/training/da…

包含访问数据库的一系列方法。

@Dao public interface UserDao {@Query('SELECT * FROM user')List<User> getAll();@Query('SELECT * FROM user WHERE uid IN (:userIds)')List<User> loadAllByIds(int[] userIds);@Query('SELECT * FROM user WHERE first_name LIKE :first AND ' + 'last_name LIKE :last LIMIT 1')User findByName(String first, String last);@Insertvoid insertAll(User... users);@Insertvoid insert(User user);@Deletevoid delete(User user); }

参考：developer.android.google.cn/training/da…

@Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase {public abstract UserDao userDao(); }5、使用

AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, 'database-name').build(); db.userDao().insert(new User());

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