Query Abstraction Allows writing SQL that works for all supported databases, without having to deal with differences in SQL dialects. Supported SQL categories: SELECT: %$db->createSelectQuery();% INSERT: %$db->createInsertQuery();% UPDATE: %$db->createUpdateQuery();% DELETE: %$db->createDeleteQuery();% Query object: Uses a "fluent-interface" Exposes an expression object through %$db->e%.