l 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:
gbase=# select pg_get_triggerdef(oid) from pg_trigger;
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)
l 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:
gbase=# select pg_get_triggerdef(oid,true) from pg_trigger;
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)
gbase=# select pg_get_triggerdef(oid,false) from pg_trigger;
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)
```
