Originally folk from ActiveAndroid

This folk add multiple database support and some performance optimization

Usage (different from original code stream)

Define a new DbMetaData class for db configuration

public class UserDbMetaData extends DbMetaData {

	private String mUin = null;

	public UserDbMetaData(String uin){
		mUin = uin;
	}

	@Override
	public int getDatabaseVersion() {
		return 12;
	}

	@Override
	public String getDatabaseName() {
		return "user_"+mUin+".db";
	}

	@Override
	public String getMigrationPath() {
		return "migration/user";
	}

    /**
     * When this flag return true, opening database under this dbMetaData will be 
     * closed if new one is register. As example:
     *
     * registerDb(1) -- database user_1.db is opened
     * registerDb(2) -- database user_1.db is closed and user_2.db is opened
     */
	@Override
	public boolean isResettable() {
		return true; 
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		if (oldVersion < 5) {
			// do somthing
		}
		if (newVersion >= 7) {
			// do somthing
		}
	}

    /**
     * You need to override equals method to tell ActiveAndroid how to 
     * identify DbMetaData to avoid open-close database too often
     */
	@Override
	public boolean equals(Object anotherObj) {
		UserDbMetaData anotherUserDbMetaData = (UserDbMetaData) anotherObj;
		return (mUin.equals(anotherUserDbMetaData.mUin));
	}

    /**
     * Call me when you are ready to open a database
     */
	public static void registerDb(String uin) {
		UserDbMetaData dbMetaData = new UserDbMetaData(uin);
		ActiveAndroid.registerDbMetaData(Configuration.getInstance().getAppContext(), dbMetaData);
	}

}

Annotate @DatabaseMetaData to your modal class

@DatabaseMetaData(metadataClass = UserDbMetaData.class)
public class Album extends Model implements Serializable { ... }

Ehancement

• If you add new modal class, just increate the value return by getDatabaseVersion(), ActiveAndroid will be able to setup missing table on next registration.
• Alternative to using @DatabaseMetaData, you could also tell ActiveAndroid where is all your modal class via res/xml/db_model_config.xml. Rather than looking up all annotated class in dex.jar, this approach will significantly improve your App's startup time.

Reset are almost the same. Enjoy it~