如何在 Android 中执行简单的 SQL 脚本行

Question

I have the following command to drop all tables, to be performed in onUpgrade:

@Override
public void onUpgrade(SQLiteDatabase db, int i, int i2) {
    // Drop all tables...
    String query = "select 'drop table ' || name || ';' from sqlite_master " +
                       "where type = 'table';";
    db.rawQuery(query, null);
    onCreate(db);
}

However it doesn't seem to do anything. All my old tables are still there. How do I execute this query properly?

Answer 1

As the source of this query says:

The output of this is a script that will drop the tables for you.

But you are never looking at its output.

You have to read the output of this query, and execute every returned string.