批量更改mysql字符集

1.修改MySQL服务器字符集

SHOW VARIABLES LIKE '%char%';

character_set_server=utf8mb4

重启服务器参数生效

2.更改所有历史业务表字符集

脚本如下：changeChar.sh

#!/bin/sh

#数据库连接信息
USERBANE='root'
PASSWD='root123'
HOST='127.0.0.1'
PORT='3306'


#查询业务库
mysql -u$USERBANE -p$PASSWD -h$HOST -P$PORT -e "select schema_name from information_schema.schemata where schema_name not in ('mysql','sys','information_schema','performance_schema')" -B > DBName.txt

#批量生成修改字符集脚本并执行
cat DBName.txt | while read line
do
    if [ $line = 'SCHEMA_NAME' ];then
    continue
    fi    
    echo "批量生成连接数据库脚本: "$line
    String='SELECT CONCAT("ALTER TABLE ", TABLE_NAME," CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_bin;") AS SQL1 FROM INFORMATION_SCHEMA.TABLES WHERE  TABLE_TYPE="BASE TABLE" AND TABLE_SCHEMA="'$line'"'
    #echo $String
    mysql -u$USERBANE -p$PASSWD -h$HOST -P$PORT -D $line -e "${String}" -B  > DBName.sql
    sed -i '1d' DBName.sql 
    cat DBName.sql  
    mysql -u$USERBANE -p$PASSWD -h$HOST -P$PORT -D $line < DBName.sql
done