MySQL 特殊参数

###开发规范

开发规范：关键字大写，库名字小写，要有字符集
CREATE DATABSE　oldboy CHARSET utf8;    ###建议采用第一种
CREATE DATABSE　oldboy CHARSET utf8mb4;

###lower_case_table_names   begin###

mysql> show variables like '%lower%';
+------------------------+-------+
| Variable_name | Value |
+------------------------+-------+
| lower_case_file_system | OFF |
| lower_case_table_names | 0 |
+------------------------+-------+
2 rows in set (0.00 sec)
#lower_case_table_names
如果此参数写作的话表示强制小写，
即使创建的数据库名字为大写也会强制修改为小写

测试：修改/etc/my.cnf文件--->>>>>>>>lower_case_table_names 将该参数置为

后续操作见代码块

 #重启数据库
 [root@db01-sa ~]# /etc/init.d/mysqld restart
 Shutting down MySQL..... SUCCESS!
 Starting MySQL.... SUCCESS!
 #登录数据库
 [root@db01-sa ~]# mysql -uroot -p123
 Warning: Using a password on the command line interface can be insecure.
 Welcome to the MySQL monitor.  Commands end with ; or \g.
 Your MySQL connection id is 1
 Server version: 5.6.38-log Source distribution

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 Oracle is a registered trademark of Oracle Corporation and/or its
 affiliates. Other names may be trademarks of their respective
 owners.

 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

 mysql> show databases;
 +--------------------+
 | Database           |
 +--------------------+
 | information_schema |
 | mysql              |
 | performance_schema |
 | test               |
 +--------------------+
 4 rows in set (0.05 sec)

 mysql> CREATE DATABASE OLDBOY CHARSET utf8;
 Query OK, 1 row affected (0.39 sec)

 mysql> show databases;
 +--------------------+
 | Database           |
 +--------------------+
 | information_schema |
 | mysql              |
 | oldboy             |
 | performance_schema |
 | test               |
 +--------------------+
 5 rows in set (0.00 sec)

###lower_case_table_names   end###