MySQL utf8mb4与emoji表情

参考 http://suifu.blog.51cto.com/9167728/1853864

客户端工具 Navicat Premium_11.2.7简体中文完美破解版(32位和64位) 支持mb4

修改MySQL配置文件

修改mysql配置文件my.cnf（windows为my.ini） 

my.cnf一般在etc/mysql/my.cnf位置。找到后请在以下三部分里添加如下内容： 

[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’

重启数据库，检查变量

SHOW VARIABLES WHERE Variable_name LIKE ‘character_set_%’ OR Variable_name LIKE ‘collation%’;

String query = “set names utf8mb4”;

stat.execute(query);

mysql> INSERT INTO messages (message) VALUES ('What a nice emoji!');

http://www.oicqzone.com/tool/emoji/

QQ地带Emoji表情代码大全

下载这个插件Chromoji 

实际批量操作 

db改字符集

#!/bin/bash

if [ -f /root/.bash_profile ];then

source /root/.bash_profile

fi 

MysqlUser=root

PassWord='xx'

Port=3306

Socket="/opt/$Port/mysql.sock"

MysqlCmd="mysql -u$MysqlUser -p$PassWord -S $Socket"

Database=`$MysqlCmd -e "show databases;"|egrep -v "Database|_schema|mysql"`

for dbname in $Database

  do

      $MysqlCmd -e 'ALTER DATABASE '$dbname' CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci';

done

table改字符集

#!/bin/bash

if [ -f /root/.bash_profile ];then

source /root/.bash_profile

fi 

MysqlUser=root

PassWord='xx'

Port=3306

Socket="/opt/$Port/mysql.sock"

MysqlCmd="mysql -u$MysqlUser -p$PassWord -S $Socket"

for database in `$MysqlCmd -e "show databases;"|sed '1,2d'|egrep -v "mysql|schema|sys"`

do 

    for table in `$MysqlCmd -e "show tables from $database;"|sed '1d'`

    do

    $MysqlCmd $database -e 'ALTER TABLE '$table' CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;'

    done

done

或则

参考https://my.oschina.net/xuqiang/blog/507629  批量修改mysql表、表、数据库的字符校对规则

查询是否修改

SELECT CONCAT('ALTER TABLE `', table_name, '` MODIFY `', column_name, '` ', DATA_TYPE, '(', CHARACTER_MAXIMUM_LENGTH, ') CHARACTER SET UTF8 COLLATE utf8_unicode_ci', (CASE WHEN IS_NULLABLE = 'NO' THEN ' NOT NULL' ELSE '' END), ';')FROM information_schema.COLUMNSWHERE TABLE_SCHEMA = 'database'AND DATA_TYPE = 'varchar'AND(

    CHARACTER_SET_NAME != 'utf8'

    OR

    COLLATION_NAME != 'utf8_unicode_ci');

新增

mysql 默认是autocommit=1 的， 

我们线上都设置一般是init_connect='set autocommit=0; set names gbk;' 这样的

init_connect='SET NAMES utf8mb4'

skip-character-set-client-handshake = true