CRAM CRAM - 1 year ago 94
SQL Question

Fastest and most efficient way to pre-populate database in Android

If you want to pre-populate a database (SQLite) in Android, this is not that easy as one might think.

So I found this tutorial which is often referenced here on Stack Overflow as well.

But I don't really like that way of pre-populating the database since you take the control from the database handler and create the files yourself. I would prefer to not touch the file system and let the database handler do everything on its own.

So what I thought one could do is create the database in the database handler's onCreate() as usual but then load a file (.sql) from /assets which contains the statements to fill in the values:

INSERT INTO testTable (name, pet) VALUES ('Mike', 'Tiger');
INSERT INTO testTable (name, pet) VALUES ('Tom', 'Cat');

But calling execSQL() in the handler's onCreate() doesn't really work. It seems that the /assets file must not have more than 1MB and the execSQL() only executes the first statement (Mike - Tiger).

What would you do do pre-populate the database?

Answer Source

I suggest the following:

  1. Wrap all of your INSERT logic into a transaction (BEGIN... COMMIT, or via the beginTransaction()... endTransaction() APIs)
  2. As already suggested, utilize the bind APIs and recycle objects.
  3. Don't create any indexes until after this bulk insert is complete.

Additionally take a look at Faster bulk inserts in sqlite3?

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