Is the onUpgrade method ever called?

Question

Is the onUpgrade method of SQLiteOpenHelper ever called? If so, when is it called and by what? If it is not called by the developers, then why is it there? What really happe

Answer 1

It is called when you construct a SQLiteOpenHelper with version newer than the version of the opened database. What to do depends on the changes in the database that are made between the old and new versions. The only case when you don't drop a changed table is when the change is noting more than an added column. Then you can use ALTER TABLE statement to add the new column to the table signature.