如何高效的重命名mysql 数据库名称

大家好：现在分享一下最近的一个测试。大家都知道，在mysql里面，没有提供重命名一个数据库的语句（其实在MySQL 5.1.7 to 5.1.23也有使用过rename database，但是因为很多的危险性，之后的版本就摒弃了这个功能），那么如何在mysql数据库中高效的重命名一个数据库呢？1、使用mysqldump备份出数据库，之后删除原来的数据库，再dump文件中修改旧数据库名称为新的名称，再导入数据库，修改数据库中的相关用户权限（mysqldump的参数必须包含视图、触发器、函数、存储过程等，这里不再说明了）

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[root@percona ~]# mysqldump emp > emp.out[root@percona ~]# mysql -e "CREATE DATABASE employees;"[root@percona ~]# mysql employees < emp.out [root@percona ~]# mysql -e "DROP DATABASE emp;"

优点：操作比较简单，不易出错弊端：在遇到数据库较大的时候，时间和磁盘空间都会有很高的要求2、利用renametable的方式实现数据库重命名主要操作步骤：A）新建数据库：create databaseB）重命名旧数据库中的表到新的数据库中，包含视图、触发器等：rename table C）删除旧数据库D）重授权相关用户的权限因为操作较为复杂，先附上两个脚本，rename_db.sh完成数据库表、触发器、事件、函数、存储过程，rename_grants.sh完成相关用户的授权转换
脚本执行方法：
A）bash rename_db.sh localhost old_database_name new_database_nameB）bash rename_grants old_database_name new_database_name
注：如果要使用的话，可以自己先测试一下，看看是否有问题，欢迎修改脚本和指正

看不见附件，贴出来了
1、rename_db.sh
#!/bin/bash
# Copyright 2013 zhujzhuo
. ~/.bash_profile > /dev/null 2>&1

if [ $# -lt 3 ]; then
echo "rename_db <server> <database> <new_database>"
exit 1
fi

old_db_exists=`mysql -h $1 -e "show databases like '$2'" -sss `

if [ -z "$old_db_exists" ]; then
echo "ERROR: Old database not exists $2"
exit 1
fi

db_exists=`mysql -h $1 -s -e "show databases like '$3'" -sss `

if [ -n "$db_exists" ]; then
echo "ERROR: New database already exists $3"
exit 1
fi
TIMESTAMP=`date +%s`

character_set=`mysql -h $1 -e "show create database $2\G" -sss | grep ^Create | awk -F'CHARACTER SET ' '{print $2}' | awk '{print $1}'`
TABLES=`mysql -h $1 -e "select TABLE_NAME from information_schema.tables where table_schema='$2' and TABLE_TYPE='BASE TABLE'" -sss`
STATUS=$?
if [ "$STATUS" != 0 ] || [ -z "$TABLES" ]; then
echo "Error retrieving tables from $2"
exit 1
fi
echo "create database $3 DEFAULT CHARACTER SET $character_set"
mysql -h $1 -e "create database $3 DEFAULT CHARACTER SET $character_set"
TRIGGERS=`mysql -h $0 $2 -e "show triggers\G" | grep Trigger: | awk '{print $2}'`
VIEWS=`mysql -h $1 -e "select TABLE_NAME from information_schema.tables where table_schema='$2' and TABLE_TYPE='VIEW'" -sss`
if [ -n "$VIEWS" ]; then
mysqldump -h $1 $2 $VIEWS > /tmp/${2}_views${TIMESTAMP}.dump
fi
mysqldump -h $1 $2 -d -t -R -E > /tmp/${2}_triggers${TIMESTAMP}.dump

if [ -n $TRIGGERS ];then
for TRIGGER in $TRIGGERS ; do
echo "drop trigger $TRIGGER"
/usr/bin/mysql -h $1 $2 -e "drop trigger $TRIGGER"
done
fi
for TABLE in $TABLES; do
echo "rename table $2.$TABLE to $3.$TABLE"
mysql -h $1 $2 -e "SET FOREIGN_KEY_CHECKS=0; rename table $2.$TABLE to $3.$TABLE"
done
if [ -n "$VIEWS" ]; then
echo "loading views"
mysql -h $1 $3 < /tmp/${2}_views${TIMESTAMP}.dump
fi
echo "loading triggers, routines and events"
mysql -h $1 $3 < /tmp/${2}_triggers${TIMESTAMP}.dump
TABLES=`mysql -h $1 -e "select TABLE_NAME from information_schema.tables where table_schema='$2' and TABLE_TYPE='BASE TABLE'" -sss`
if [ -z "$TABLES" ]; then
echo "Dropping database $2"
mysql -h $1 $2 -e "drop database $2"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.columns_priv where db='$2'" -sss` -gt 0 ]; then
COLUMNS_PRIV=" UPDATE mysql.columns_priv set db='$3' WHERE db='$2';"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.procs_priv where db='$2'" -sss` -gt 0 ]; then
PROCS_PRIV=" UPDATE mysql.procs_priv set db='$3' WHERE db='$2';"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.tables_priv where db='$2'" -sss` -gt 0 ]; then
TABLES_PRIV=" UPDATE mysql.tables_priv set db='$3' WHERE db='$2';"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.db where db='$2'" -sss` -gt 0 ]; then
DB_PRIV=" UPDATE mysql.db set db='$3' WHERE db='$2';"
fi
if [ -n "$COLUMNS_PRIV" ] || [ -n "$PROCS_PRIV" ] || [ -n "$TABLES_PRIV" ] || [ -n "$DB_PRIV" ]; then
echo "IF YOU WANT TO RENAME the GRANTS YOU NEED TO RUN ALL OUTPUT BELOW:"
if [ -n "$COLUMNS_PRIV" ]; then echo "$COLUMNS_PRIV"; fi
if [ -n "$PROCS_PRIV" ]; then echo "$PROCS_PRIV"; fi
if [ -n "$TABLES_PRIV" ]; then echo "$TABLES_PRIV"; fi
if [ -n "$DB_PRIV" ]; then echo "$DB_PRIV"; fi
echo " flush privileges;"
fi

2、rename_grants.sh
#!/bin/bash
DATE=`date +%Y%m%d`
if [ -f "/tmp/grants$DATE.sql" ];then
rm -fr /tmp/grants$DATE.sql;
fi
for i in `mysql -N -s -e "select concat(\"show grants for '\",user,\"'@'\",host,\"';\") from mysql.user"|grep -w 'show grants'| mysql -N |grep -w 'GRANT'| sed 's/$/;/g' | grep $1 | awk -F'TO' '{print $2}'`;do mysql -N -s -e "show grants for $i"|grep -w 'GRANT'| sed 's/$/;/g' >> /tmp/grants$DATE.sql;done
if [ -f "/tmp/grants$DATE.sql" ];then
sed -i "s/$1/$2/g" /tmp/grants$DATE.sql;
fi
for i in `mysql -N -s -e "select concat(\"show grants for '\",user,\"'@'\",host,\"';\") from mysql.user"|grep -w 'show grants'| mysql -N |grep -w 'GRANT'| sed 's/$/;/g' | grep $1 | awk -F'TO' '{print $2}'`;do mysql -N -s -e "drop user $i" ;done
mysql < /tmp/grants$DATE.sql

本文出自 “爱mysql爱学习” 博客，请务必保留此出处http://zhuatlantis.blog.51cto.com/6106101/1345592