Home Database Mysql Tutorial mysql批量剔除指定前缀的表,批量修改表名的SQL语句

mysql批量剔除指定前缀的表,批量修改表名的SQL语句

Jun 07, 2016 pm 04:15 PM
mysql sql Revise prefix batch designation Table Name statement

mysql批量删除指定前缀的表,批量修改表名的SQL语句 Select CONCAT( 'drop table ', table_name, ';' ) FROM information_schema.tables Where table_name LIKE 'uc_%'; 注意: like ‘uc_%’ 其中 uc_是你需要替换的表前缀. 执行查询,会自动生成出 drop table

mysql批量删除指定前缀的表,批量修改表名的SQL语句
Select CONCAT( 'drop table ', table_name, ';' )  FROM information_schema.tables Where table_name LIKE 'uc_%'; 
注意: like ‘uc_%’ 其中 uc_是你需要替换的表前缀.
执行查询,会自动生成出 drop table table_name这样的SQL语句.
然后复制 drop语句 可以执行删除的操作了.
这么一来也可以安全的审核一下语句,避免误操作..
顺便补充一下一个批量修改表名的操作方法
Select CONCAT( 'ALTER TABLE ', table_name, 'RENAME TO ', table_name,';' ) 
FROM information_schema.tables Where table_name LIKE 'uc_%'; 
下面这种代码是今天遇到的,表头前面是 db,但是没有下横线显得很乱,于是批量将”dbtable_name”改成”db_table_name”
主要用的函数是mysql的substring函数
mysql教程 substring 字符截取函数
substring(str,pos)语法
substring(filed,m):截取filed字段从第m个字符开始到结束的字符串;
substring(filed,m,n):截取filed字段从第m个字符开始的长度为n的字符串;
str,字符
pos,从第几个开始取
Select CONCAT( 'ALTER TABLE ', table_name, 'RENAME TO db_', substring(table_name,3),';' ) 
FROM information_schema.tables Where table_name LIKE 'db%'; 
会得到结果
ALTER TABLE uc_aaa RENAME TO uc_aaa; 
ALTER TABLE uc_bbb RENAME TO uc_bbb;


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