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’;
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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;
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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)
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学生表的说明如下。查询如下 -
mysql> desc student;
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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)
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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';
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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)
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查看上面的示例输出，所有列名称都已更改为小写。
以上就是在 MySQL 中将所有表和列重命名为小写？的详细内容，更多请关注每日运维网(www.mryunwei.com)其它相关文章！
