DML 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:

select pg_get_triggerdef(oid) from pg_trigger;

返回结果为：

                                         pg_get_triggerdef
----------------------------------------------------------------------------------------------------------------------------
CREATE TRIGGER tg1 BEFORE INSERT ON gtest26 FOR EACH STATEMENT EXECUTE PROCEDURE gtest_trigger_func()
CREATE TRIGGER tg03 AFTER INSERT ON gtest26 FOR EACH ROW WHEN ((new.a IS NOT NULL)) EXECUTE PROCEDURE gtest_trigger_func()
(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。

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:

select pg_get_triggerdef(oid,true) from pg_trigger;
select pg_get_triggerdef(oid,false) from pg_trigger;

返回结果依次为：

                                         pg_get_triggerdef
-----------------------------------------------------------------------------------------------------------------------------
CREATE TRIGGER tg1 BEFORE INSERT ON gtest26 FOR EACH STATEMENT EXECUTE PROCEDURE gtest_trigger_func()
CREATE TRIGGER tg03 AFTER INSERT ON gtest26 FOR EACH ROW WHEN (new.a IS NOT NULL) EXECUTE PROCEDURE gtest_trigger_func()
(2 rows)
        
                                            pg_get_triggerdef
-----------------------------------------------------------------------------------------------------------------------------
CREATE TRIGGER tg1 BEFORE INSERT ON gtest26 FOR EACH STATEMENT EXECUTE PROCEDURE gtest_trigger_func()
CREATE TRIGGER tg03 AFTER INSERT ON gtest26 FOR EACH ROW WHEN ((new.a IS NOT NULL)) EXECUTE PROCEDURE gtest_trigger_func()
(2 rows)

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DML 触发器函数

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