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
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[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
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mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character%' OR Variable_name LIKE 'collation%'; |
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+--------------------------+--------------------+| 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
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mysql> select * from SCHEMATA where SCHEMA_NAME='ttlsa'; |
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+--------------+-------------+----------------------------+------------------------+----------+| 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
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mysql> select TABLE_SCHEMA,TABLE_NAME,TABLE_COLLATION from information_schema.TABLES; |
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+--------------------+----------------------------------------------------+--------------------+| TABLE_SCHEMA | TABLE_NAME | TABLE_COLLATION |+--------------------+----------------------------------------------------+--------------------+ |
查看列字符集
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mysql> select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,COLLATION_NAME from COLUMNS; |
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+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+| TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | COLLATION_NAME |+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+ |
转换字符集语句
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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 |
