Question

I’m using the Notepad example for my class definition of a DBAdapter.

An example of my table structure:

Vehicle -> "_id", "registration", "idmake", "model"
Make -> "_id", "name"

At the moment I’m using a query to get the vehicle data and fill a ListView:

public Cursor fetchVehicles() {

    return mDb.query("Vehicle", new String[] { "_id", "registration",
            "idmake", "model" }, null, null, null, null, null);
}

My question is, how can I make a query like this except it returns the corresponding Make name instead of the idmake field?

Thanks

Answer 1

You should JOIN these two tables.

String SELECT_NAME = "SELECT M.name FROM Make M INNER JOIN Vehicle V ON M._id = V._id";
cursor.rawQuery(SELECT_NAME, null);

Second param in rawQuery method takes where args so you can do that like this:

String ANOTHER_SELECT = "SELECT M.name FROM Make M INNER JOIN Vehicle V ON M._id = V._id WHERE M._id = ?";
cursor.rawQuery(ANOTHER_SELECT, new String[] {String.valueOf(<dataId>)});

A little a few about rawQuery method

Regards