[英]Android Room - auto increment @database version number?
During development my Room db schema is very volatile. 在开发期间,我的Room db模式非常不稳定。 Every time I do any change to the schema I need to update my version number, like this;
每次我对架构进行任何更改时,我都需要更新我的版本号,就像这样;
@Database(version = 27,
entities = {MyClass.class})
public abstract class MyDatabase extends RoomDatabase
I am using fallbackToDestructiveMigration too; 我也在使用fallbackToDestructiveMigration;
Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, SystemStrings.ROOM_DATABASE_NAME)
// allow queries on the main thread.
// Don't do this on a real app!
.allowMainThreadQueries()
.fallbackToDestructiveMigration()
.build();
Is there any way to avoid updating the version number for each "little" change? 有没有办法避免更新每个“小”更改的版本号? As I said, things are quite volatile right now.
正如我所说,现在情况非常不稳定。
Deleteing the database would result in it being initialised/built each time the App is run. 删除数据库将导致每次运行应用程序时对其进行初始化/构建。
You could do this using :- 你可以这样做: -
context.getApplicationContext().deleteDatabase(SystemStrings.ROOM_DATABASE_NAME); //<<<< ADDED before building Database.
//Your existing code follows
Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, SystemStrings.ROOM_DATABASE_NAME)
// allow queries on the main thread.
// Don't do this on a real app!
.allowMainThreadQueries()
.fallbackToDestructiveMigration()
.build();
Of course you would not have this in the real app 当然,你不会在真正的应用程序中有这个
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