public callable(sql as String,
resultSetType as ResultSetType = ResultSetType.FORWARD_ONLY,
concurrency as ResultSetConcurrency = ResultSetConcurrency.READ_ONLY,
holdability as ResultSetHoldability = ResultSetHoldability.CLOSE_CURSORS_AT_COMMIT) as CallableStatement throws SQLException

import klyn.databases.sql

call = connection.callable("{ call refresh_cache() }")