MySQL 5.7 update误操作后数据恢复详解
墨墨导读：本文详述MySQL 5.7 模拟update误操作后进行数据恢复的全过程，希望对大家有帮助。
背景介绍
MySQL目前还没有像Oracle数据库那样强大有闪回的功能，MySQL只能通过挖去binlog日志的方法来获取数据，但是有个前提就是binlog_format必须设置成row。下面通过一个案例来演示。
注意：严禁在生产环境测试
表结构
测试的表结构如下：
CREATE TABLE `update_test` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`user_id` varchar(20) NOT NULL DEFAULT '',
`vote_num` int(10) unsigned NOT NULL DEFAULT '0',
`group_id` int(10) unsigned NOT NULL DEFAULT '0',
`status` tinyint(2) unsigned NOT NULL DEFAULT '1',
`create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间' ,
PRIMARY KEY (`id`),
KEY `index_user_id` (`user_id`) USING HASH
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
修改数据
插入和修改测试数据，对user_id字段的内容进行了修改。
insert into update_test (Select * from recordss_memory limit 20);
查看修改前的数据：
root@localhost#mysql.sock : tc0110:56:12>select * from update_test;
+----+-------------+----------+----------+--------+---------------------+
| id | user_id | vote_num | group_id | status | create_time |
+----+-------------+----------+----------+--------+---------------------+
| 1 | ddddddddddd | 4502 | 2 | 1 | 2020-06-04 11:34:17 |
| 2 | ddddddddddd | 5564 | 1 | 1 | 2020-06-04 11:34:17 |
| 3 | ddddddddddd | 3521 | 2 | 1 | 2020-06-04 11:34:17 |
| 4 | ddddddddddd | 1414 | 0 | 1 | 2020-06-04 11:34:17 |
| 5 | ddddddddddd | 8047 | 1 | 1 | 2020-06-04 11:34:17 |
| 6 | ddddddddddd | 5556 | 1 | 1 | 2020-06-04 11:34:17 |
| 7 | ddddddddddd | 7166 | 1 | 2 | 2020-06-04 11:34:17 |
| 8 | ddddddddddd | 3277 | 2 | 2 | 2020-06-04 11:34:17 |
| 9 | ddddddddddd | 8658 | 2 | 1 | 2020-06-04 11:34:17 |
| 10 | ddddddddddd | 4146 | 0 | 2 | 2020-06-04 11:34:17 |
| 11 | ddddddddddd | 7906 | 2 | 1 | 2020-06-04 11:34:17 |
| 12 | ddddddddddd | 512 | 0 | 2 | 2020-06-04 11:34:17 |
| 13 | ddddddddddd | 7493 | 0 | 1 | 2020-06-04 11:34:17 |
| 14 | ddddddddddd | 5583 | 1 | 1 | 2020-06-04 11:34:17 |
| 15 | ddddddddddd | 4273 | 2 | 1 | 2020-06-04 11:34:17 |
| 16 | ddddddddddd | 1117 | 0 | 1 | 2020-06-04 11:34:17 |
| 17 | ddddddddddd | 3936 | 2 | 1 | 2020-06-04 11:34:17 |
| 18 | ddddddddddd | 4735 | 2 | 1 | 2020-06-04 11:34:17 |
| 19 | ddddddddddd | 2505 | 0 | 1 | 2020-06-04 11:34:17 |
| 20 | ddddddddddd | 2523 | 2 | 1 | 2020-06-04 11:34:17 |
+----+-------------+----------+----------+--------+---------------------+
20 rows in set (0.00 sec)
root@localhost#mysql.sock : tc0110:56:49>show master logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 536871032 |
| mysql-bin.000002 | 536871341 |
| mysql-bin.000003 | 197210338 |
+------------------+-----------+
3 rows in set (0.00 sec)
root@localhost#mysql.sock : tc0110:57:29> show binary logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 536871032 |
| mysql-bin.000002 | 536871341 |
| mysql-bin.000003 | 197210338 |
+------------------+-----------+
3 rows in set (0.00 sec)
root@localhost#mysql.sock : tc0110:57:54> update update_test set user_id='ture';
root@localhost#mysql.sock : tc0110:59:05>select * from update_test;
+----+---------+----------+----------+--------+---------------------+
| id | user_id | vote_num | group_id | status | create_time |
+----+---------+----------+----------+--------+---------------------+
| 1 | ture | 4502 | 2 | 1 | 2020-06-04 11:34:17 |
| 2 | ture | 5564 | 1 | 1 | 2020-06-04 11:34:17 |
| 3 | ture | 3521 | 2 | 1 | 2020-06-04 11:34:17 |
| 4 | ture | 1414 | 0 | 1 | 2020-06-04 11:34:17 |
| 5 | ture | 8047 | 1 | 1 | 2020-06-04 11:34:17 |
| 6 | ture | 5556 | 1 | 1 | 2020-06-04 11:34:17 |
| 7 | ture | 7166 | 1 | 2 | 2020-06-04 11:34:17 |
| 8 | ture | 3277 | 2 | 2 | 2020-06-04 11:34:17 |
| 9 | ture | 8658 | 2 | 1 | 2020-06-04 11:34:17 |
| 10 | ture | 4146 | 0 | 2 | 2020-06-04 11:34:17 |
| 11 | ture | 7906 | 2 | 1 | 2020-06-04 11:34:17 |
| 12 | ture | 512 | 0 | 2 | 2020-06-04 11:34:17 |
| 13 | ture | 7493 | 0 | 1 | 2020-06-04 11:34:17 |
| 14 | ture | 5583 | 1 | 1 | 2020-06-04 11:34:17 |
| 15 | ture | 4273 | 2 | 1 | 2020-06-04 11:34:17 |
| 16 | ture | 1117 | 0 | 1 | 2020-06-04 11:34:17 |
| 17 | ture | 3936 | 2 | 1 | 2020-06-04 11:34:17 |
| 18 | ture | 4735 | 2 | 1 | 2020-06-04 11:34:17 |
| 19 | ture | 2505 | 0 | 1 | 2020-06-04 11:34:17 |
| 20 | ture | 2523 | 2 | 1 | 2020-06-04 11:34:17 |
+----+---------+----------+----------+--------+---------------------+
20 rows in set (0.00 sec)
root@localhost#mysql.sock : tc0110:59:11>show binary logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 536871032 |
| mysql-bin.000002 | 536871341 |
| mysql-bin.000003 | 197211765 |
+------------------+-----------+
3 rows in set (0.00 sec)
挖取binlog日志
通过mysqlbinlog命令来查看修改的内容。
/usr/local/mysql/bin/mysqlbinlog --no-defaults -v -v --base64-output=DECODE-ROWS mysql-bin.000003 | grep -B 15 'ture'| more
内容如下
# at 197210475
#200610 10:59:05 server id 1023306 end_log_pos 197210536 CRC32 0xee919b04 Rows_query
# update update_test set user_id='ture'
# at 197210536
#200610 10:59:05 server id 1023306 end_log_pos 197210598 CRC32 0xeb431251 Table_map: `tc01`.`update_test` mapped to number 120
# at 197210598
#200610 10:59:05 server id 1023306 end_log_pos 197211734 CRC32 0x5f211a8d Update_rows: table id 120 flags: STMT_END_F
### UPDATE `tc01`.`update_test`
### WHERE
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='ddddddddddd' /* VARSTRING(60) meta=60 nullable=0 is_null=0 */
### @3=4502 /* INT meta=0 nullable=0 is_null=0 */
### @4=2 /* INT meta=0 nullable=0 is_null=0 */
### @5=1 /* TINYINT meta=0 nullable=0 is_null=0 */
### @6='2020-06-04 11:34:17' /* DATETIME(0) meta=0 nullable=0 is_null=0 */
### SET
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='ture' /* VARSTRING(60) meta=60 nullable=0 is_null=0 */
### @3=4502 /* INT meta=0 nullable=0 is_null=0 */
### @4=2 /* INT meta=0 nullable=0 is_null=0 */
### @5=1 /* TINYINT meta=0 nullable=0 is_null=0 */
### @6='2020-06-04 11:34:17' /* DATETIME(0) meta=0 nullable=0 is_null=0 */
### UPDATE `tc01`.`update_test`
### WHERE
### @1=2 /* INT meta=0 nullable=0 is_null=0 */
### @2='ddddddddddd' /* VARSTRING(60) meta=60 nullable=0 is_null=0 */
### @3=5564 /* INT meta=0 nullable=0 is_null=0 */
### @4=1 /* INT meta=0 nullable=0 is_null=0 */
### @5=1 /* TINYINT meta=0 nullable=0 is_null=0 */
### @6='2020-06-04 11:34:17' /* DATETIME(0) meta=0 nullable=0 is_null=0 */
### SET
### @1=2 /* INT meta=0 nullable=0 is_null=0 */
### @2='ture' /* VARSTRING(60) meta=60 nullable=0 is_null=0 */
### @3=5564 /* INT meta=0 nullable=0 is_null=0 */
### @4=1 /* INT meta=0 nullable=0 is_null=0 */
### @5=1 /* TINYINT meta=0 nullable=0 is_null=0 */
### @6='2020-06-04 11:34:17' /* DATETIME(0) meta=0 nullable=0 is_null=0 */
..........................
找出位置后，把binlog的记录导出来。
/usr/local/mysql/bin/mysqlbinlog --no-defaults -v -v --base64-output=DECODE-ROWS mysql-bin.000003 | sed -n '/# at 197210598/,/COMMIT/p' > ./update_test.txt
这些是误操作之前的数据
### @1=19 /* INT meta=0 nullable=0 is_null=0 */
### @2='ddddddddddd' /* VARSTRING(60) meta=60 nullable=0 is_null=0 */
### @3=2505 /* INT meta=0 nullable=0 is_null=0 */
### @4=0 /* INT meta=0 nullable=0 is_null=0 */
### @5=1 /* TINYINT meta=0 nullable=0 is_null=0 */
### @6='2020-06-04 11:34:17' /* DATETIME(0) meta=0 nullable=0 is_null=0 */
这些是误操作之后的数据
### @1=19 /* INT meta=0 nullable=0 is_null=0 */
### @2='ture' /* VARSTRING(60) meta=60 nullable=0 is_null=0 */
### @3=2505 /* INT meta=0 nullable=0 is_null=0 */
### @4=0 /* INT meta=0 nullable=0 is_null=0 */
### @5=1 /* TINYINT meta=0 nullable=0 is_null=0 */
### @6='2020-06-04 11:34:17' /* DATETIME(0) meta=0 nullable=0 is_null=0 */
替换成需要的SQL语句
下一步转换成需要的SQL语句：
sed '/WHERE/{:a;N;/SET/!ba;s/([^
]*)
(.*)
(.*)/3
2
1/}' update_test.txt|sed -r '/WHERE/{:a;N;/@6/!ba;s/### @2.*//g}'|sed 's/### //g;s//*.*/,/g' | sed '/WHERE/{:a;N;/@1/!ba;s/,/;/g};s/#.*//g;s/COMMIT,//g'|sed '/^$/d' > ./update_test_recover.sql
SQL内容如下：
[mysql@tc02 binlog]$ cat update_test_recover.sql
UPDATE `tc01`.`update_test`
SET
@1=1 ,
@2='ddddddddddd' ,
@3=4502 ,
@4=2 ,
@5=1 ,
@6='2020-06-04 11:34:17' ,
WHERE
@1=1 ;
UPDATE `tc01`.`update_test`
SET
@1=2 ,
@2='ddddddddddd' ,
@3=5564 ,
@4=1 ,
@5=1 ,
@6='2020-06-04 11:34:17' ,
WHERE
@1=2 ;
UPDATE `tc01`.`update_test`
SET
@1=3 ,
@2='ddddddddddd' ,
@3=3521 ,
@4=2 ,
@5=1 ,
@6='2020-06-04 11:34:17' ,
WHERE
@1=3 ;
.........................
.........................
需要进一步替换@1，@2，@3…@6.
CREATE TABLE `update_test` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`user_id` varchar(20) NOT NULL DEFAULT '',
`vote_num` int(10) unsigned NOT NULL DEFAULT '0',
`group_id` int(10) unsigned NOT NULL DEFAULT '0',
`status` tinyint(2) unsigned NOT NULL DEFAULT '1',
`create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间' ,
PRIMARY KEY (`id`),
KEY `index_user_id` (`user_id`) USING HASH
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
根据这个表结构替换：
sed -i 's/@1/id/g;s/@2/user_id/g;s/@3/vote_num/g;s/@4/group_id/g;s/@5/status/g;s/@6/create_time/g' update_test_recover.sql
修改后的内容如下：
UPDATE `tc01`.`update_test`
SET
id=1 ,
user_id='ddddddddddd' ,
vote_num=4502 ,
group_id=2 ,
status=1 ,
create_time='2020-06-04 11:34:17' ,
WHERE
id=1 ;
UPDATE `tc01`.`update_test`
SET
id=2 ,
user_id='ddddddddddd' ,
vote_num=5564 ,
group_id=1 ,
status=1 ,
create_time='2020-06-04 11:34:17' ,
WHERE
id=2 ;
UPDATE `tc01`.`update_test`
SET
id=3 ,
user_id='ddddddddddd' ,
vote_num=3521 ,
group_id=2 ,
status=1 ,
create_time='2020-06-04 11:34:17' ,
WHERE
id=3 ;
....................................
.....................................
生成恢复用的SQL语句
还有一个问题,就是需要把create_time后面的逗号去掉。使用下面的命令：
sed -i -r 's/(create_time=.*),/1/g' update_test_recover.sql
查看内容如下：
UPDATE `tc01`.`update_test`
SET
id=1 ,
user_id='ddddddddddd' ,
vote_num=4502 ,
group_id=2 ,
status=1 ,
create_time='2020-06-04 11:34:17'
WHERE
id=1 ;
UPDATE `tc01`.`update_test`
SET
id=2 ,
user_id='ddddddddddd' ,
vote_num=5564 ,
group_id=1 ,
status=1 ,
create_time='2020-06-04 11:34:17'
WHERE
id=2 ;
UPDATE `tc01`.`update_test`
SET
id=3 ,
user_id='ddddddddddd' ,
vote_num=3521 ,
group_id=2 ,
status=1 ,
create_time='2020-06-04 11:34:17'
WHERE
id=3 ;
UPDATE `tc01`.`update_test`
SET
id=4 ,
user_id='ddddddddddd' ,
vote_num=1414 ,
group_id=0 ,
status=1 ,
create_time='2020-06-04 11:34:17'
WHERE
id=4 ;
............................
..............................
满足了条件之后，我们执行语句：
root@localhost#mysql.sock : tc0111:33:29>source update_test_recover.sql
root@localhost#mysql.sock : tc0111:34:14>select * from `tc01`.`update_test`;
+----+-------------+----------+----------+--------+---------------------+
| id | user_id | vote_num | group_id | status | create_time |
+----+-------------+----------+----------+--------+---------------------+
| 1 | ddddddddddd | 4502 | 2 | 1 | 2020-06-04 11:34:17 |
| 2 | ddddddddddd | 5564 | 1 | 1 | 2020-06-04 11:34:17 |
| 3 | ddddddddddd | 3521 | 2 | 1 | 2020-06-04 11:34:17 |
| 4 | ddddddddddd | 1414 | 0 | 1 | 2020-06-04 11:34:17 |
| 5 | ddddddddddd | 8047 | 1 | 1 | 2020-06-04 11:34:17 |
| 6 | ddddddddddd | 5556 | 1 | 1 | 2020-06-04 11:34:17 |
| 7 | ddddddddddd | 7166 | 1 | 2 | 2020-06-04 11:34:17 |
| 8 | ddddddddddd | 3277 | 2 | 2 | 2020-06-04 11:34:17 |
| 9 | ddddddddddd | 8658 | 2 | 1 | 2020-06-04 11:34:17 |
| 10 | ddddddddddd | 4146 | 0 | 2 | 2020-06-04 11:34:17 |
| 11 | ddddddddddd | 7906 | 2 | 1 | 2020-06-04 11:34:17 |
| 12 | ddddddddddd | 512 | 0 | 2 | 2020-06-04 11:34:17 |
| 13 | ddddddddddd | 7493 | 0 | 1 | 2020-06-04 11:34:17 |
| 14 | ddddddddddd | 5583 | 1 | 1 | 2020-06-04 11:34:17 |
| 15 | ddddddddddd | 4273 | 2 | 1 | 2020-06-04 11:34:17 |
| 16 | ddddddddddd | 1117 | 0 | 1 | 2020-06-04 11:34:17 |
| 17 | ddddddddddd | 3936 | 2 | 1 | 2020-06-04 11:34:17 |
| 18 | ddddddddddd | 4735 | 2 | 1 | 2020-06-04 11:34:17 |
| 19 | ddddddddddd | 2505 | 0 | 1 | 2020-06-04 11:34:17 |
| 20 | ddddddddddd | 2523 | 2 | 1 | 2020-06-04 11:34:17 |
+----+-------------+----------+----------+--------+---------------------+
20 rows in set (0.00 sec)
恢复到了修改之前的记录，本次恢复测试完成。
墨天轮原文链接：https://www.modb.pro/db/26098（复制到浏览器中打开或者点击“阅读原文”可达）
推荐阅读：144页！分享珍藏已久的数据库技术年刊
数据和云
ID：OraNews
如有收获，请划至底部，点击“在看”，谢谢！
点击下图查看更多 ↓
云和恩墨大讲堂 | 一个分享交流的地方
长按，识别二维码，加入万人交流社群
请备注：云和恩墨大讲堂
点个“在看”
你的喜欢会被看到❤