设置步骤: 一、编辑MySql的配置文件 MySql的配置文件Windows下一般在系统目录下或者在MySql的安装目录下名字叫my-default.ini,可以搜索,Linux下一般是 / etc /my.cnf default-character-set = utf8 character_set_server = utf8 lower_case_table_names =
设置步骤:
一、编辑MySql的配置文件
MySql的配置文件Windows下一般在系统目录下或者在MySql的安装目录下名字叫my-default.ini,可以搜索,Linux下一般是 /etc/my.cnf
default-character-set = utf8
character_set_server = utf8
lower_case_table_names = 1 //表名不区分大小写(此与编码无关)
default-character-set = utf8
default-character-set = utf8
default-character-set = utf8
default-character-set = utf8
二、重新启动MySql服务
Windows可在服务管理器中操作,也可使用命令行:
net stop mysql 回车
net start mysql 回车
服务名可能不一定为mysql,请按自己的设置
Linux下面可是用 service mysql restart
如果出现启动失败,请检查配置文件有没有设置错误
?
?
三、查看设置结果
登录MySql命令行客户端:打开命令行
mysql –uroot –p 回车
输入密码
进入mysql后 执行 :show variables like "%char%";
显示结果应该类似如下:
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
如果仍有编码不是utf8请用mysql命令设置:
set character_set_client = utf8;
set character_set_server = utf8;
set character_set_connection = utf8;
set character_set_database = utf8;
set character_set_results = utf8;
set collation_connection = utf8_general_ci;
set collation_database = utf8_general_ci;
set collation_server = utf8_general_ci;
以上命令有部分只对当前登录有效,所以不是很管用。

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The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.

MySQL uses a GPL license. 1) The GPL license allows the free use, modification and distribution of MySQL, but the modified distribution must comply with GPL. 2) Commercial licenses can avoid public modifications and are suitable for commercial applications that require confidentiality.

The situations when choosing InnoDB instead of MyISAM include: 1) transaction support, 2) high concurrency environment, 3) high data consistency; conversely, the situation when choosing MyISAM includes: 1) mainly read operations, 2) no transaction support is required. InnoDB is suitable for applications that require high data consistency and transaction processing, such as e-commerce platforms, while MyISAM is suitable for read-intensive and transaction-free applications such as blog systems.

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.


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