《Mysql实例使MySQL能够存储emoji表情字符的设置教程》要点：
本文介绍了Mysql实例使MySQL能够存储emoji表情字符的设置教程，希望对您有用。如果有疑问，可以联系我们。
MYSQL必读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.
MYSQL必读
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必读将Mysql的编码从utf8转换成utf8mb4.
MYSQL必读需要 >= 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
MYSQL必读停止MySQL Server服务
MYSQL必读修改 my.cnf或者mysql.ini
MYSQL必读
[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'
MYSQL必读重启 MySQL Server、检查字符集.
MYSQL必读查看服务器字符集设置
MYSQL必读
mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character%' OR Variable_name LIKE 'collation%';
MYSQL必读
+--------------------------+--------------------+
| 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 |
+--------------------------+--------------------+
MYSQL必读查看数据库字符集
MYSQL必读
mysql> select * from SCHEMATA where SCHEMA_NAME='ttlsa';
MYSQL必读
+--------------+-------------+----------------------------+------------------------+----------+
| CATALOG_NAME | SCHEMA_NAME | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH |
+--------------+-------------+----------------------------+------------------------+----------+
| def | ttlsa | utf8mb4 | utf8mb4_unicode_ci | NULL |
+--------------+-------------+----------------------------+------------------------+----------+
MYSQL必读查看表字符集
MYSQL必读
mysql> select TABLE_SCHEMA,TABLE_NAME,TABLE_COLLATION from information_schema.TABLES;
MYSQL必读
+--------------------+----------------------------------------------------+--------------------+
| TABLE_SCHEMA | TABLE_NAME | TABLE_COLLATION |
+--------------------+----------------------------------------------------+--------------------+
MYSQL必读查看列字符集
MYSQL必读
mysql> select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,COLLATION_NAME from COLUMNS;
MYSQL必读
+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+
| TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | COLLATION_NAME |
+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+
MYSQL必读转换字符集语句
MYSQL必读
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
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