.search() with like operator and underscore in search string problem

The like/ilike operator seems to have problems when there are underscore(s) in the search string.

After some research i found that the underscore is special char for postgres and needs some escaping. However there seems to a problem with either openerp or psycopg.

The query i try to run:

self.pool.get('ir.model.fields').search(cr, uid, [('model_id', '=', ir_model_id), ('name', 'like', 'x\_magerp\_ebay\_damen\_' )])

After that i tried to do it via .execute():

cr.execute('select ir_model_fields.id from "ir_model_fields" where (ir_model_fields.model_id = %s) AND (ir_model_fields.name like %s)', [ir_model_id, 'x\_magerp\_ebay\_damen\_%'])

when i turn on sql logs it gets transformed to:

sql:query: select ir_model_fields.id from "ir_model_fields" where (ir_model_fields.model_id = 109) AND (ir_model_fields.name like E'x\\_magerp\\_ebay\\_damen\\_%')

I can copy that sql and execute it just fine in postgres with the expected results, however in openerp i get a empty list back.