在 MySQL 中将所有表和列重命名为小写?
mysqlmysqli database
您可以借助 INFORMATION_SCHEMA.COLUMNS 来实现这一点。语法如下 −
SELECT CONCAT('ALTER TABLE ', TABLE_NAME, ' CHANGE `', COLUMN_NAME, '` `',
LOWER(COLUMN_NAME), '` ', COLUMN_TYPE, ';') AS anyAliasName
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = ‘yourDatabaseName’;
现在使用具有两个表的数据库。数据库名称如下"bothinnodbandmyisam"。此数据库具有以下表−
- employee
- student
employee 表的描述如下 −
mysql> desc employee;
以下是输出。假设员工表中有以下非小写的列 −
+--------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------+-------------+------+-----+---------+-------+ | EmployeeId | int(11) | YES | | NULL | | | EmployeeName | varchar(30) | YES | | NULL | | +--------------+-------------+------+-----+---------+-------+ 2 rows in set (0.00 sec)
student 表的描述如下。查询如下 −
mysql> desc student;
以下是输出。假设 student 表中有以下非小写的列 −
+-------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+-------------+------+-----+---------+-------+ | StudentId | int(11) | YES | | NULL | | | StudentName | varchar(20) | YES | | NULL | | +-------------+-------------+------+-----+---------+-------+ 2 rows in set (0.00 sec)
以下是将所有表的列名更改为小写的查询。查询如下 −
mysql> SELECT CONCAT('ALTER TABLE ', TABLE_NAME, ' CHANGE `', COLUMN_NAME, '` `',
-> LOWER(COLUMN_NAME), '` ', COLUMN_TYPE, ';') AS changeColumnNameToLower
-> FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'bothinnodbandmyisam';
以下是显示 ALTER TABLE 命令的输出，该命令显示更新后的列名 −
+------------------------------------------------------------------------+ | changeColumnNameToLower | +------------------------------------------------------------------------+ | ALTER TABLE employee CHANGE `EmployeeId` `employeeid` int(11); | | ALTER TABLE employee CHANGE `EmployeeName` `employeename` varchar(30); | | ALTER TABLE student CHANGE `StudentId` `studentid` int(11); | | ALTER TABLE student CHANGE `StudentName` `studentname` varchar(20); | +------------------------------------------------------------------------+ 4 rows in set (0.00 sec)
查看上面的示例输出，所有列名都已改为小写。
