数据库重命名

1.若库中所有表为MyISAM引擎，则可改库对应的文件夹的名字 

关闭MySQL Server：

/etc/init.d/mysql stop

 

改目录名：

cd /data/mysql; mv old_db new_db;

开启MySQL Server

/etc/init.d/mysql start

2.重命名旧库下边的所有表

create databases new_db;
rename table old_db.table1 to new_db.table1,old_db.table2 to new_db.table2,...;
drop database old_db;

eg:

mysql> create database old_db;
Query OK, 1 row affected (0.00 sec)

mysql> use old_db;
Database changed

mysql> create table a ( a int);
Query OK, 0 rows affected (0.24 sec)

mysql> insert into a select 1;
Query OK, 1 row affected (0.01 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> create database new_db;
Query OK, 1 row affected (0.00 sec)

mysql> rename table old_db.a to new_db.a;
Query OK, 0 rows affected (0.18 sec)

mysql> use new_db;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from a;
+------+
| a    |
+------+
|    1 |
+------+
1 row in set (0.18 sec)

mysql> use old_db;
Database changed

mysql> select * from a;
ERROR 1146 (42S02): Table 'old_db.a' doesn't exist

mysql> drop database old_db;
Query OK, 0 rows affected (0.01 sec)

 

3.建新库，使用mysqldump工具导出老库数据并导入新库

mysqldump -uuser -ppass -hhost -Pport --single-transaction old_db >old_db.sql

mysql  -uuser -ppass -hhost -Pport -e "create database new_db"

mysql  -uuser -ppass -hhost -Pport  new_db < old_db.sql

mysql  -uuser -ppass -hhost -Pport -e "drop database old_db"

 

其中方法2中表比较多的情况下，一个个写这些名称未免太痛苦了，可用shell脚本或者存储过程来完成

#!/bin/bash
mysqlconn=" mysql -uuser -ppass  -hhost -Pport ”
old_db=”old_db ”
new_db=”new_db ”
$mysqlconn -e “CREATE DATABASE $new_db”
params=$($mysqlconn -N -e “SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE table_schema=’$old_db’”)
for name in $params; do
$mysqlconn -e “RENAME TABLE $old_db.$name to $new_db.$name”;
done;
$mysqlconn -e “DROP DATABASE $old_db”