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问题描述

The content of the front-end page is entered in Chinese,or generated during executionlogThe information is in Chinese,Will report database-related coding errors. 经查看docker 生成的mysqlThe database coded character set is by defaultlatin, 不是utf-8,The database encoding character set needs to be modified,In addition to modifying the encoding of the database,Also need to modify the data table,The coded character set for the fields of the data table

关于mysqlCharacter set knowledge

我们创建表的时候,有一个charset字段,同时还会有一个collate字段. The following text is from the Internet,讲的很不错.

COLLATE通常是和数据编码（CHARSET）相关的,一般来说每种CHARSET都有多种它所支持的COLLATE,并且每种CHARSET都指定一种COLLATE为默认值.例如Latin1编码的默认COLLATE为latin1_swedish_ci,GBK编码的默认COLLATE为gbk_chinese_ci,utf8mb4编码的默认值为utf8mb4_general_ci.

mysql中有utf8和utf8mb4两种编码,在mysql中请大家忘记**utf8**,永远使用**utf8mb4**.这是mysql的一个遗留问题,mysql中的utf8最多只能支持3bytes长度的字符编码,对于一些需要占据4bytes的文字,mysql的utf8就不支持了,要使用utf8mb4才行.

很多COLLATE都带有_ci字样,这是Case Insensitive的缩写,即大小写无关,也就是说"A"和"a"They are treated equally when sorting and comparing.selection * from table1 where field1="a"同样可以把field1为"A"value selected.与此同时,对于那些_cs后缀的COLLATE,则是Case Sensitive,i.e. case sensitive

登录docker mysql

There are several ways to log in

一种通过docker 容器命令行

Find the command line button as shown in the figure,Click to enter the command line terminal Enter login in the terminalmysql的命令： mysql -uname -ppwd

A through database management software

我用的是dbeaver, 注意连接数据库的port要和docker里的port端口保持一致

修改数据库编码

在这里,我直接在dbeaver执行如下语句 The first line is the displaymysqlThe character set setting for the current database The rest of the lines are all setting the character set toutf-8 执行成功后,The following can be executed againshowThe statement verifies the following.

show variables like 'character%';
set character_set_database =utf8;
set character_set_results =utf8;
set character_set_server =utf8;
set character_set_system =binary;
SET collation_server = utf8_general_ci;
SET collation_database = utf8_general_ci;
复制代码

Modify data tables and data table fields

核心sql语句如下：

'alter table tableName character set utf8mb4;修改数据表,To specify a specific data table name
show create tableName ;验证是否修改成功
alter table tableName convert to character set utf8 collate utf8_general_ci; 修改数据表字段