在 MySQL 中将所有表和列重命名为小写？

您可以借助 INFORMATION_SCHEMA.COLUMNS 来实现此目的。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’;

现在使用有两个表的数据库。数据库名称如下“bothinnodbandmyisam”。该数据库有以下表格 -

• employee
• student

employee 表的描述是如下 -

mysql> desc employee;

以下是输出。假设员工表中有以下列不是小写的 -

+--------------+-------------+------+-----+---------+-------+
| Field        | Type        | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| EmployeeId   | int(11)     |  YES |     | NULL    |       |
| EmployeeName | varchar(30) | YES  |     | NULL    |       |
+--------------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)

学生表的说明如下。查询如下 -

mysql> desc student;

以下是输出。假设学生表中有以下列不是小写的 -

+-------------+-------------+------+-----+---------+-------+
| Field       | Type        | Null | Key | Default | Extra |
+-------------+-------------+------+-----+---------+-------+
| StudentId   | int(11)     | YES  |     | NULL    |       |
| StudentName | varchar(20) | YES  |     | NULL    |       |
+-------------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)

这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，其中显示了更新的列名称 -

+------------------------------------------------------------------------+
| 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，所有列名称都已更改为小写。

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