【www.bbyears.com--mysql教程】
当数据库某个字段的内容出现统一性的错误,需要替换时,我们可以使用mysql语句中的replace来实现替换,把正确的内容替换错误的内容。
update 表 set 字段名 =replace(字段名,’被替换的内容’,"替换的内容’) where 条件(也可以不用加,不用加是全部替换)
列1
update aaaa set abcd=replace(abcd,’http://localhost/’,"http://www.111cn.net/’) where pid>4
意思是把表aaaa里面pic>4的,字段abcd中的http://localhost/内容替换成http://www.111cn.net/
例2
代码如下mysql> select host,user from user where user="testuser";
+-----------------------+----------+
| host | user |
+-----------------------+----------+
| localhost.localdomain | testuser |
+-----------------------+----------+
update字段host的内容,把"main"改成"slave",用REPLACE
代码如下mysql> update user set host=REPLACE(host,"main","slave") where user="testuser";
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select host,user from user where user="testuser";
+------------------------+----------+
| host | user |
+------------------------+----------+
| localhost.localdoslave | testuser |
+------------------------+----------+
由查询结果到,数据已经更新成功