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

Please see this page for the syntax to create a new column on a table. Basically it is:

ALTER TABLE mytable ADD COLUMN mycolumn TEXT

In your onUpgrade method, it would look something like this:

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    String upgradeQuery = "ALTER TABLE mytable ADD COLUMN mycolumn TEXT";
    if (oldVersion == 1 && newVersion == 2)
         db.execSQL(upgradeQuery);
}