- 首先在继承RoomBase的类当中,定义Migration
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static Migration migration = new Migration(1,2) { @Override public void migrate(@NonNull SupportSQLiteDatabase database) { database.execSQL("alter table student_table ADD COLUMN begin_time INTEGER NOT NULL DEFAULT 0"); } };
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- RooDataBase().addMigrations(migration).build
-
Room.databaseBuilder(mContext.getApplicationContext(),WorkRoomDataBase.class,"work_database") .addMigrations(ALL_MIGRATIONS) ....
-
- 注意,定义INTEGER字段的时候 需要加NOT NULL DEFAULT 0,否则汇报错(IlegalStateException)
Room数据库升级
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转载自www.cnblogs.com/endian11/p/11950657.html
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