本文介绍了如何使用某些前缀使MySQL表主键自动递增的处理方法,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
我有这样的桌子
table id Varchar(45) NOT NULL AUTO_INCREMENT PRIMARY KEY, name CHAR(30) NOT NULL,我想增加我的id字段,例如'LHPL001','LHPL002','LHPL003' ...等. 我该怎么办?请让我知道任何可能的方式.
I want to increment my id field like 'LHPL001','LHPL002','LHPL003'... etc. What should I have to do for that? Please let me know any possible way.
推荐答案如果您确实需要这样做,可以通过单独的排序表(如果您不介意)和触发器来实现您的目标.
If you really need this you can achieve your goal with help of separate table for sequencing (if you don't mind) and a trigger.
表格
CREATE TABLE table1_seq ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY ); CREATE TABLE table1 ( id VARCHAR(7) NOT NULL PRIMARY KEY DEFAULT '0', name VARCHAR(30) );现在触发
DELIMITER $$ CREATE TRIGGER tg_table1_insert BEFORE INSERT ON table1 FOR EACH ROW BEGIN INSERT INTO table1_seq VALUES (NULL); SET NEW.id = CONCAT('LHPL', LPAD(LAST_INSERT_ID(), 3, '0')); END$$ DELIMITER ;然后您只需将行插入到table1
Then you just insert rows to table1
INSERT INTO Table1 (name) VALUES ('Jhon'), ('Mark');您将拥有
| ID | NAME | ------------------ | LHPL001 | Jhon | | LHPL002 | Mark |这里是 SQLFiddle 演示
Here is SQLFiddle demo
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如何使用某些前缀使MySQL表主键自动递增
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