postgres触发器创建 - 错误:没有指定语言的SQL状态:42P13

问题描述 投票:13回答:1

我是新手来触发。我试图通过以下链接创建一个触发器 - http://www.postgresqltutorial.com/creating-first-trigger-postgresql/。但它给出了一些错误。代码块和错误如下:

代码块>>

    CREATE OR REPLACE FUNCTION log_last_name_changes()
  RETURNS trigger AS
$BODY$
BEGIN
 IF NEW.last_name <> OLD.last_name THEN
 INSERT INTO employee_audits(employee_id,last_name,changed_on)
 VALUES(OLD.id,OLD.last_name,now());
 END IF;

 RETURN NEW;
END;
$BODY$

而错误>>

 ERROR: no language specified
SQL state: 42P13

有人可以帮我吗?

sql postgresql
1个回答
18
投票

试试这种方式:

CREATE OR REPLACE FUNCTION log_last_name_changes()
RETURNS trigger AS
$BODY$
BEGIN
IF NEW.last_name <> OLD.last_name THEN
INSERT INTO employee_audits(employee_id,last_name,changed_on)
VALUES(OLD.id,OLD.last_name,now());
END IF;

RETURN NEW;
END;
$BODY$

LANGUAGE plpgsql VOLATILE -- Says the function is implemented in the plpgsql language; VOLATILE says the function has side effects.
COST 100; -- Estimated execution cost of the function.
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