触发器函数

  • pg_get_triggerdef(oid)

    描述：获取触发器的定义信息。

    参数：待查触发器的OID。

    返回值类型：text

    示例:

    1. postgres=# select pg_get_triggerdef(oid) from pg_trigger;
    2.                                                                                      pg_get_triggerdef
    3. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    4.  CREATE TRIGGER tg1 BEFORE INSERT ON gtest26 FOR EACH STATEMENT EXECUTE PROCEDURE gtest_trigger_func()
    5.  CREATE TRIGGER tg03 AFTER INSERT ON gtest26 FOR EACH ROW WHEN ((new.a IS NOT NULL)) EXECUTE PROCEDURE gtest_trigger_func()
    6. (2 rows)

  • pg_get_triggerdef(oid, boolean)

    描述：获取触发器的定义信息。

    参数：待查触发器的OID及是否以pretty方式展示。

    触发器函数 - 图1 说明： 仅在创建trigger时指定WHEN条件的情况下，布尔类型参数才生效。

    返回值类型：text

    示例:

    1. postgres=# select pg_get_triggerdef(oid,true) from pg_trigger;
    2.                                                                                      pg_get_triggerdef
    3. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    4.  CREATE TRIGGER tg1 BEFORE INSERT ON gtest26 FOR EACH STATEMENT EXECUTE PROCEDURE gtest_trigger_func()
    5.  CREATE TRIGGER tg03 AFTER INSERT ON gtest26 FOR EACH ROW WHEN (new.a IS NOT NULL) EXECUTE PROCEDURE gtest_trigger_func()
    6. (2 rows)
    8. postgres=# select pg_get_triggerdef(oid,false) from pg_trigger;
    9.                                                                                      pg_get_triggerdef
    10. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    11.  CREATE TRIGGER tg1 BEFORE INSERT ON gtest26 FOR EACH STATEMENT EXECUTE PROCEDURE gtest_trigger_func()
    12.  CREATE TRIGGER tg03 AFTER INSERT ON gtest26 FOR EACH ROW WHEN ((new.a IS NOT NULL)) EXECUTE PROCEDURE gtest_trigger_func()
    13. (2 rows)