I am trying to find out the best way to do a simple table join on my two tables using a sqlite database in an android application. Is the simplest way to use CursorJoiner or is there any easier way?
In the implementation of SQLiteDatabase and SQLiteQueryBuilder you will see that it is possible to pass the tables you want to join to the
table argument of
query even though the documentation implies it will only take a single name of a table. The documentation for SQLiteQueryBuilder is more clear and even suggests things like
foo, bar or
foo LEFT OUTER JOIN bar ON (foo.id = bar.foo_id).
If you’re willing to use a third-party library, I recommend using Active Android
using it you can merge tables like this
From query = new Select() .from(Foo.class) .innerJoin(Bar.class) .on("Foo.Id=Bar.Id");
you can even get a cursor back to use in loaders
Cursor cursor = Cache.openDatabase().rawQuery(query.toSql(), query.getArguments());
more details here