PostgreSQL插入触发器进行串联 [英] Postgresql insert trigger to concatenate
本文介绍了PostgreSQL插入触发器进行串联的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想创建一个触发器以将我的列与事件插入前连接起来,但是查询无法正常工作,并且出现错误:
I want to create a trigger to concatenate my column with event "before insert", but the query didn't work and i got an error:
SQL错误:
SQL error:
错误: SET处或附近的语法错误第4行:SET new.fullname =
CONCAT(new.first_name ,'',new.mid_name,...
ERROR: syntax error at or near "SET" LINE 4: SET new.fullname = CONCAT(new.first_name, '', new.mid_name, ...
In statement:
CREATE TRIGGER insert_trigger
BEFORE INSERT ON t_employees
FOR EACH ROW
SET new.fullname = CONCAT(new.first_name, '', new.mid_name, '', new.last_name);
推荐答案
这是一个可行的解决方案:
Here's a working solution:
CREATE TEMPORARY TABLE t_employees (
first_name TEXT,
mid_name TEXT,
last_name TEXT,
fullname TEXT
);
CREATE OR REPLACE FUNCTION set_fullname()
RETURNS TRIGGER AS $$
BEGIN
NEW.fullname = NEW.first_name || ' ' || NEW.mid_name || ' ' || NEW.last_name;
RETURN NEW;
END;
$$ language 'plpgsql';
CREATE TRIGGER set_fullname_trigger
BEFORE INSERT OR UPDATE ON t_employees
FOR EACH ROW
EXECUTE PROCEDURE set_fullname();
SET client_min_messages TO 'debug';
INSERT INTO t_employees VALUES ('fname1', 'mname1', 'lname1');
SELECT * FROM t_employees;
UPDATE t_employees SET first_name = 'updated-first-name';
SELECT * FROM t_employees;
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