graphql-engine/server/src-rsr/trigger.sql.shakespeare

CREATE OR REPLACE function hdb_catalog.#{qualifiedTriggerName}() RETURNS trigger
  LANGUAGE plpgsql
  AS $$
  DECLARE
    _old record;
    _new record;
    _data json;
  BEGIN
    IF TG_OP = 'UPDATE' THEN
      _old := #{oldRow};
      _new := #{newRow};
    ELSE
    /* initialize _old and _new with dummy values for INSERT and UPDATE events*/
      _old := row((select 1));
      _new := row((select 1));
    END IF;
    _data := json_build_object(
      'old', #{oldPayloadExpression},
      'new', #{newPayloadExpression}
    );
    BEGIN
    /* NOTE: formerly we used TG_TABLE_NAME in place of tableName here. However in the case of
    partitioned tables this will give the name of the partitioned table and since we use the table name to
    get the event trigger configuration from the schema, this fails because the event trigger is only created
    on the original table.  */
      IF (TG_OP <> 'UPDATE') OR (_old <> _new) THEN
        PERFORM hdb_catalog.insert_event_log(CAST(#{schemaName} AS text), CAST(#{tableName} AS text), CAST('#{name}' AS text), TG_OP, _data);
      END IF;
      EXCEPTION WHEN undefined_function THEN
        IF (TG_OP <> 'UPDATE') OR (_old *<> _new) THEN
          PERFORM hdb_catalog.insert_event_log(CAST(#{schemaName} AS text), CAST(#{tableName} AS text), CAST('#{name}' AS text), TG_OP, _data);
        END IF;
    END;

    RETURN NULL;
  END;
$$;
DROP TRIGGER IF EXISTS #{qualifiedTriggerName} ON #{qualifiedTable};
CREATE TRIGGER #{qualifiedTriggerName} AFTER #{operation} ON #{qualifiedTable} FOR EACH ROW EXECUTE PROCEDURE hdb_catalog.#{qualifiedTriggerName}();