在大备份文件里抽取单个库或单个表的脚本

MYSQL通常单机单实例，每个实例下面有很多不同的库，备份时带上--all-databases,有时候会需要从备份文件里面抽取单个库，或者某个库下的某个表。

如果还原全部数据库，肯定是可以做到的，但是时间代价非常大。下面这个脚本就是实现快速提取单个库，单个表

#/bin/bash

#author :zuoxingyu

#create_date:2014-05-28

#usage :./single_table_restore.sh back.sql DB1

#usage :./single_table_restore.sh back.sql DB1 T1

BACKUP_FILE=$1

DB_NAME=$2

TB_NAME=$3
#至少有2个参数,第一个参数是备份文件名称，第二个参数是库名称，第三个参数是表名称，第三个参数不存在时，恢复库

if [ "-$1" = "-" ];then

echo "you must privide backup file."

exit 0

fi
if [ "-$2" = "-" ];then

echo "you must provide database name or table name."

exit 0

fi
echo "restore DB_NAME:" $DB_NAME "restore TB_NAME:" $TB_NAME
echo "generate restore file start" `date "+%Y-%m-%d %H:%M:%S"`

if [ "-$3" != "-" ];then

sed -n "/^-- Current Database: \`$DB_NAME\`/,/^-- Current Database:/p" $BACKUP_FILE|sed -n "/^-- Table structure for table \`$TB_NAME\`/,/^UNLOCK TABLES/p" >restore.sql

else

sed -n "/^-- Current Database: \`$DB_NAME\`/,/^-- Current Database:/p" $BACKUP_FILE>restore.sql

fi

echo "generate restore file end" `date "+%Y-%m-%d %H:%M:%S"`

echo "filename:./restore.sql"

抽取单个表：

[[email protected] data]# ./single_table_restore.sh back.sql DB1 T1

restore DB_NAME: DB1 restore TB_NAME: T1

generate restore file start 2014-05-28 19:25:22

generate restore file end 2014-05-28 19:25:22

filename:./restore.sql

[root@meizuDB data]# cat restore.sql

-- Table structure for table `T1`

--

DROP TABLE IF EXISTS `T1`;

/*!40101 SET @saved_cs_client     = @@character_set_client */;

/*!40101 SET character_set_client = utf8 */;

CREATE TABLE `T1` (

  `id` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/*!40101 SET character_set_client = @saved_cs_client */;
--

-- Dumping data for table `T1`

--
LOCK TABLES `T1` WRITE;

/*!40000 ALTER TABLE `T1` DISABLE KEYS */;

INSERT INTO `T1` VALUES (1),(2),(3);

/*!40000 ALTER TABLE `T1` ENABLE KEYS */;

UNLOCK TABLES;

抽取单个库

[[email protected] data]# ./single_table_restore.sh back.sql DB1

restore DB_NAME: DB1 restore TB_NAME:

generate restore file start 2014-05-28 19:29:43

generate restore file end 2014-05-28 19:29:43

filename:./restore.sql

[root@meizuDB data]# cat restore.sql

-- Current Database: `DB1`

--

CREATE DATABASE /*!32312 IF NOT EXISTS*/ `DB1` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `DB1`;
--

-- Table structure for table `T1`

--
DROP TABLE IF EXISTS `T1`;

/*!40101 SET @saved_cs_client     = @@character_set_client */;

/*!40101 SET character_set_client = utf8 */;

CREATE TABLE `T1` (

  `id` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/*!40101 SET character_set_client = @saved_cs_client */;
--

-- Dumping data for table `T1`

--
LOCK TABLES `T1` WRITE;

/*!40000 ALTER TABLE `T1` DISABLE KEYS */;

INSERT INTO `T1` VALUES (1),(2),(3);

/*!40000 ALTER TABLE `T1` ENABLE KEYS */;

UNLOCK TABLES;
--

-- Current Database: `DB2`

在大备份文件里抽取单个库或单个表的脚本