[英]how to set default value for text type in mysql
CREATE TABLE IF NOT EXISTS `te` (
`id` int(30) NOT NULL,
`name` text NOT NULL,
`address` text NOT NULL,
`Aboutus` text NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Here Table 'te' consist 4 fields id, name, address, Aboutus, Aboutus is optional means how can i update default text to the Profile in db , by phpmyadmin sql 这里的表'te'包含4个字段id,name,address,Aboutus,Aboutus是可选的,意味着如何通过phpmyadmin sql将默认文本更新为db中的Profile
I have changed not null to null for about us field 关于我们字段,我已将null更改为null
CREATE TABLE IF NOT EXISTS `te` (
`id` int(30) NOT NULL,
`name` text NOT NULL,
`address` text NOT NULL,
`Aboutus` text NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Here is your trigger BEFORE INSERT
这是你的
BEFORE INSERT
触发器
CREATE TRIGGER new_insert
BEFORE INSERT ON `te`
FOR EACH ROW
SET NEW.`Aboutus` = CASE WHEN NEW.Aboutus IS NULL THEN 'Not Updated' ELSE NEW.Aboutus END
;
Insert without Aboutus
插入没有
Aboutus
INSERT INTO `te` (`id`, `name`, `address`)
VALUES (1, 'name', 'address') ;
Insert with Aboutus
插入
Aboutus
INSERT INTO `te` (`id`, `name`, `address`, `Aboutus`)
VALUES (2, 'name', 'address', 'Aboutus') ;
Insert by passing null Aboutus
通过传递null
Aboutus
插入
INSERT INTO `te` (`id`, `name`, `address`, `Aboutus`)
VALUES (3, 'name', 'address', null) ;
Edit As @garethD pointed a case for update scenario,you also need another trigger on BEFORE UPDATE
so if null appears in update then aboutus should be updated as Not Updated
编辑为@garethD指出了更新场景的情况,您还需要
BEFORE UPDATE
上的另一个触发器,因此如果更新中出现null,那么aboutus应该更新为Not Updated
CREATE TRIGGER update_trigger
BEFORE UPDATE ON `te`
FOR EACH ROW
SET NEW.`Aboutus` = CASE WHEN NEW.Aboutus IS NULL THEN 'Not Updated' ELSE NEW.Aboutus END
;
UPDATE te
SET AboutUs = NULL;
For Ubuntu 16.04: 对于Ubuntu 16.04:
How to disable strict mode in MySQL 5.7: 如何在MySQL 5.7中禁用严格模式:
Edit file /etc/mysql/mysql.conf.d/mysqld.cnf 编辑文件/etc/mysql/mysql.conf.d/mysqld.cnf
If below line exists in mysql.cnf 如果mysql.cnf中存在以下行
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
Then Replace it with 然后用它替换它
sql_mode='MYSQL40'
Otherwise 除此以外
Just add below line in mysqld.cnf 只需在mysqld.cnf中添加以下行
sql_mode='MYSQL40'
This resolved problem. 这解决了问题。
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