使MySQL能够存储emoji表情字符的设置教程

mysql/' target='_blank'>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。

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。

将Mysql的编码从utf8转换成utf8mb4。

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

修改 my.cnf或者mysql.ini

[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'

重启 MySQL Server、检查字符集。

查看服务器字符集设置

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 |+--------------------------+--------------------+

查看数据库字符集

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   |+--------------+-------------+----------------------------+------------------------+----------+

查看表字符集

mysql> select TABLE_SCHEMA,TABLE_NAME,TABLE_COLLATION from information_schema.TABLES;

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

查看列字符集

mysql> select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,COLLATION_NAME from COLUMNS;

+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+| TABLE_SCHEMA    | TABLE_NAME                     | COLUMN_NAME                | COLLATION_NAME   |+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+

转换字符集语句

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