Android SQLite Database, WHY drop table and recreate on upgrade

Question

In the tutorials I am following and a lot of more places I see this, onUpgrade -> drop table if exists, then recreate table.

What is the purpose of this?

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Answer 1

I agree when you upgrade you should be adding columns or adding tables to your database. Most of the onupgrade samples actually suck because why am I deleting all this data then recreating the table? I found this blog entry I call it the Adams Incremental Update Method. It also handles situations where users may have not upgraded your app with each release.

Here is a good blog on sqlite onupgrade that doesn't do drop table.