更新/插入触发器之前的Postgresql不';似乎不起作用
我有以下触发功能:更新/插入触发器之前的Postgresql不';似乎不起作用,postgresql,triggers,plpgsql,Postgresql,Triggers,Plpgsql,我有以下触发功能: CREATE OR REPLACE FUNCTION update_modelname_function() RETURNS trigger AS $BODY$ BEGIN IF tg_op = 'INSERT' THEN new.model_name := upper(new.model_name); RETURN new; END IF; IF tg_op = 'UPDATE' THEN old.model_name := u
CREATE OR REPLACE FUNCTION update_modelname_function()
RETURNS trigger AS
$BODY$
BEGIN
IF tg_op = 'INSERT' THEN
new.model_name := upper(new.model_name);
RETURN new;
END IF;
IF tg_op = 'UPDATE' THEN
old.model_name := upper(old.model_name);
RETURN new;
END IF;
END
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
我试图实现的是,列model_name的值在表中持久化时总是大写。然而,似乎什么也没有发生。有什么想法吗?你不小心更新了
旧的
,而不是新的
。尝试:
CREATE OR REPLACE FUNCTION update_modelname_function()
RETURNS trigger AS
$BODY$
BEGIN
IF tg_op = 'INSERT' THEN
new.model_name := upper(new.model_name);
RETURN new;
ELSIF tg_op = 'UPDATE' THEN
new.model_name := upper(new.model_name);
RETURN new;
END IF;
END
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
如果示例显示了整个代码,而实际触发器仅在INSERT
和/或UPDATE
时触发,则可以进一步简化:
CREATE OR REPLACE FUNCTION update_modelname_function()
RETURNS trigger AS
$BODY$
BEGIN
new.model_name := upper(new.model_name);
RETURN new;
END
$BODY$
LANGUAGE plpgsql VOLATILE;
您意外地更新了
旧的
,而不是新的
。尝试:
CREATE OR REPLACE FUNCTION update_modelname_function()
RETURNS trigger AS
$BODY$
BEGIN
IF tg_op = 'INSERT' THEN
new.model_name := upper(new.model_name);
RETURN new;
ELSIF tg_op = 'UPDATE' THEN
new.model_name := upper(new.model_name);
RETURN new;
END IF;
END
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
如果示例显示了整个代码,而实际触发器仅在INSERT
和/或UPDATE
时触发,则可以进一步简化:
CREATE OR REPLACE FUNCTION update_modelname_function()
RETURNS trigger AS
$BODY$
BEGIN
new.model_name := upper(new.model_name);
RETURN new;
END
$BODY$
LANGUAGE plpgsql VOLATILE;