使MySQL能够存储emoji表情字符的设置教程
这篇文章主要介绍了使MySQL能够存储emoji表情字符的设置教程,关键在于utf8mb4字符集的设置,需要的朋友可以参考下
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'
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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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+--------------------------+--------------------+
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Variable_name | Value |
+--------------------------+--------------------+
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character_set_client | utf8mb4 |
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character_set_connection | utf8mb4 |
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character_set_database | utf8mb4 |
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character_set_filesystem | binary |
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character_set_results | utf8mb4 |
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character_set_server | utf8mb4 |
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character_set_system | utf8 |
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collation_connection | utf8mb4_unicode_ci |
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collation_database | utf8mb4_unicode_ci |
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collation_server | utf8mb4_unicode_ci |
+--------------------------+--------------------+
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查看数据库字符集
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mysql> select *
from SCHEMATA
where SCHEMA_NAME= 'ttlsa' ;
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+--------------+-------------+----------------------------+------------------------+----------+
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CATALOG_NAME | SCHEMA_NAME | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH |
+--------------+-------------+----------------------------+------------------------+----------+
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def | ttlsa | utf8mb4 | utf8mb4_unicode_ci | NULL |
+--------------+-------------+----------------------------+------------------------+----------+
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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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+--------------------+----------------------------------------------------+--------------------+
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TABLE_SCHEMA | TABLE_NAME | TABLE_COLLATION |
+--------------------+----------------------------------------------------+--------------------+
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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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+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+
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TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | COLLATION_NAME |
+--------------------+----------------------------------------------------+--------------------------------------------+--------------------+
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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' , 'tinyte
xt' , 'mediumtext' ,'long
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