Android SQLite database and app update

Question

I have developed an android app and released version 1.0. The app contains SQLite local database with 5 tables.

Now we planned to release version 2.0 also update the version 1.0 users. In version 2.0 we have included extra two tables with previous 5 table, so 7 tables now.

Now my question is, The version 1.0 users all have some data in the local database, If he update to the version 2.0 the previous data will get lost? If it so. then what is the alternate method?

Answer 1

You should put all changes in your onUpgrade method you can use this code:

@Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    String sql = "ALTER TABLE " + TABLE_SECRET + " ADD COLUMN " +
     "name_of_column_to_be_added" + " INTEGER";
    db.execSQL(sql);        
}        

this adds a column in your current database. Your database will not lose data. Reminder: onUpgrade will be called when getWriteableDatabase or getReadableDatabase is executed AND the version of your database is different from your older version.

Answer 2

Change your db version and add extra two table creation methods in your onUpgrade(SQLiteDatabase db, int oldVersion, int newVesion) method. Now the the previous data will not get lost.

I hope this will help you.

Answer 3

You can do some on SQLiteOpenHelper#onUpgrade, get some old data. and insert into new table