如何解决返回的行结构与触发表的结构不匹配？

Question

我已将 varchar 数据类型长度的事务表列从 50 更改为 100。一旦我更改了列的长度.. 来自父表的触发器开始失败.. 一旦我删除并创建触发器，从主表函数中删除所有内容工作正常..不确定是什么问题..有什么理由吗？

Detail: Returned type character varying(50) does not match expected type character varying(100) in column 15.

CREATE FUNCTION customer_delete_master()
    RETURNS trigger
    LANGUAGE 'plpgsql'
    COST 100
    VOLATILE NOT LEAKPROOF 
     AS $BODY$

DECLARE
    r customer%rowtype;
BEGIN
    DELETE FROM ONLY customer where customer_id = new.customer_id returning * into r;
    RETURN r;
end;

$BODY$;

更新 1：

CREATE TABLE customer
(
    customer_id character varying(10),
    firstname character varying(100),
    lastname character varying(50),
    CONSTRAINT customer_pkey PRIMARY KEY (customer_id)
);

CREATE TRIGGER after_insert_customer_trigger
    AFTER INSERT
    ON customer
    FOR EACH ROW
    EXECUTE PROCEDURE customer_delete_master();

Answer 1

任何时候更改具有依赖对象（如触发器和视图）的表时，都应重新编译依赖对象。这是因为数据库引擎直接从缓存中访问依赖对象的定义。 例如，在触发器的情况下，可以在更改父表之前和之后禁用和启用它们。或者您可以再次执行更改触发器。

禁用：

ALTER TABLE mytable DISABLE TRIGGER mytrigger;

启用：

ALTER TABLE mytable ENABLE TRIGGER mytrigger;