使MySQL能够存储emoji表情字符的设置教程

2020-04-05 作者:计算机教程   |   浏览(179)
[client] default-character-set = utf8mb4[mysql] default-character-set = utf8mb4[mysqld] character-set-client-handshake = FALSE character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci init_connect='SET NAMES utf8mb4'
use information_schema;SELECT concat("ALTER DATABASE `",table_schema,"` CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;") as _sql FROM `TABLES` where table_schema like "DB_NAME" group by table_schema;SELECT concat("ALTER TABLE `",table_schema,"`.`",table_name,"` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") as _sql FROM `TABLES` where table_schema like "DB_NAME" group by table_schema, table_name;SELECT concat("ALTER TABLE `",table_schema,"`.`",table_name, "` CHANGE `",column_name,"` `",column_name,"` ",data_type,"(",character_maximum_length,") CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") as _sql FROM `COLUMNS` where table_schema like "DB_NAME" and data_type in ('varchar');SELECT concat("ALTER TABLE `",table_schema,"`.`",table_name, "` CHANGE `",column_name,"` `",column_name,"` ",data_type," CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") as _sql FROM `COLUMNS` where table_schema like "DB_NAME" and data_type in ('text','tinytext','mediumtext','long
mysql select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,COLLATION_NAME from COLUMNS;

 -------------------- ---------------------------------------------------- -------------------------------------------- -------------------- | TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | COLLATION_NAME | -------------------- ---------------------------------------------------- -------------------------------------------- -------------------- 
mysql select * from SCHEMATA where SCHEMA_NAME='ttlsa';

 -------------- ------------- ---------------------------- ------------------------ ---------- | CATALOG_NAME | SCHEMA_NAME | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH | -------------- ------------- ---------------------------- ------------------------ ---------- | def | ttlsa | utf8mb4 | utf8mb4_unicode_ci | NULL | -------------- ------------- ---------------------------- ------------------------ ---------- 
mysql select TABLE_SCHEMA,TABLE_NAME,TABLE_COLLATION from information_schema.TABLES;

 -------------------- ---------------------------------------------------- -------------------- | TABLE_SCHEMA | TABLE_NAME | TABLE_COLLATION | -------------------- ---------------------------------------------------- -------------------- 

转换字符集语句

查看列字符集

修改 my.cnf或者mysql.ini

utf8mb4和utf8到底有什么区别呢?原来以往的mysql的utf8一个字符最多3字节,而utf8mb4则扩展到一个字符最多能有4字节,所以能支持更多的字符集。

mysql SHOW VARIABLES WHERE Variable_name LIKE 'character%' OR Variable_name LIKE 'collation%';

 -------------------------- -------------------- | Variable_name | Value | -------------------------- -------------------- | character_set_client | utf8mb4 || character_set_connection | utf8mb4 || character_set_database | utf8mb4 || character_set_filesystem | binary || character_set_results | utf8mb4 || character_set_server | utf8mb4 || character_set_system | utf8 || collation_connection | utf8mb4_unicode_ci || collation_database | utf8mb4_unicode_ci || collation_server | utf8mb4_unicode_ci | -------------------------- -------------------- 

将Mysql的编码从utf8转换成utf8mb4。

重启 MySQL Server、检查字符集。

查看服务器字符集设置

查看表字符集

查看数据库字符集

MySQL 需要支持 emoji 表情符号版本需要大于5.5.3,且字符集需要设置为utf8mb4 字符集。

需要 = MySQL 5.5.3版本、从库也必须是5.5的了、低版本不支持这个字符集、复制报错

停止MySQL Server服务

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