Android : Delete Specific Row From Database

I`am trying to delete a specific row in database.

i am deleting by using this query:

Uri myUri = Uri.parse("content://com.idan.datastorageprovider/maps");
this.getContentResolver().delete(myUri, "ROUTE_NAME="+routeName,null);


in my database i have 2 columns: ROUTE_NAME,ROUTE_PATH. and i want to delete a row by the column ROUTE_NAME, while i give it a value of which row in that column i want to delete. i get no errors, but the row is still there.