与OR一起加入Kohana

Question

I'm trying to combine two tables based on if they match a given pair in a many-to-many relation. I already know the SQL statement I'm trying to produce, which is functionally equivalent to the following:

SELECT columnA, columnB, ...
...
JOIN matching_table
    ON ( (matching_table.id1 = table_a.id AND matching_table.id2 = table_b.id) OR
         (matching_table.id1 = table_b.id AND matching_table.id2 = table_a.id) )
...

But I want to produce it using Kohana's query builder for consistency. The problem is I can't seem to find a way of creating a complex ON query. So far all I've got is

DB::select('columnA', 'columnB', ...)
...
    ->join('matching_table')
        ->on('matching_table.id1', '=', 'table_a.id')
        ->on('matching_table.id2', '=', 'table_b.id')
...

and this generates the first AND sequence but I can't seem to put it together with an OR .

Any suggestions?

Answer 1

You should be able to use where instead of on (not tested though):

->join('matching_table')
->where_open()
->where('matching_table.id1', '=', 'table_a.id')
->and_where('matching_table.id2', '=', 'table_b.id')
->where_close()
->or_where_open()
->where('matching_table.id1', '=', 'table_b.id')
->and_where('matching_table.id2', '=', 'table_a.id')
->or_where_close()