SQLite add column, keep data

Question

I have a database with 4 columns:

@Override
public void onCreate(SQLiteDatabase database) {
        database.execSQL(\"CREATE TABLE \" + DATABASENAME + \" (name          


        

Answer 1

The right way to add new column to DB, for example in version 2, would be:

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    if (oldVersion < 2) {
         db.execSQL("ALTER TABLE mytable ADD COLUMN mycolumn TEXT");
    }
}

It covers all pitfalls, including major issue with the selected answer: if a user goes from version 1 to 3 they will miss the upgrade query completely! These users will be in an awkward limbo where they are missing a few of the intermediate updates and do not have the expected sql schema.

Also don't forget to alter the create statement adding new column.