【Mysql】从binlog中找出单个表的binlog信息

发布时间：2020-08-07 02:27:08 来源：ITPUB博客阅读：407 作者：小亮520cl 栏目：MySQL数据库

无聊研究binlog写了个提取单个表的binlog 的信息，便于误删恢复数据，这样做的目的是为了减少恢复时其他表可能引起的出错，以及缩短恢复时间
首先研究binlog日志的格式

如下：
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#160229 15:19:52 server id 162 end_log_pos 123 CRC32 0xbbe9b551 Start: binlog v 4, server v 5.7.9-log created 160229 15:19:52 at startup
# Warning: this binlog is either in use or was not closed properly.
ROLLBACK/*!*/;
BINLOG '
GPHTVg+iAAAAdwAAAHsAAAABAAQANS43LjktbG9nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAY8dNWEzgNAAgAEgAEBAQEEgAAXwAEGggAAAAICAgCAAAACgoKKioAEjQA
AVG16bs=
'/*!*/;
# at 123
#160229 15:19:52 server id 162 end_log_pos 154 CRC32 0xd473f6f4 Previous-GTIDs
# [empty]
# at 154
#160229 15:18:07 server id 162 end_log_pos 219 CRC32 0xe86bb499 Anonymous_GTID last_committed=0 sequence_number=1
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 219
#160229 15:18:07 server id 162 end_log_pos 291 CRC32 0xe1803afe Query thread_id=102887 exec_time=341 error_code=0
SET TIMESTAMP=1456730287/*!*/;
SET @@session.pseudo_thread_id=102887/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=524288/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C latin1 *//*!*/;
SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=33/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 291
#160229 15:18:07 server id 162 end_log_pos 343 CRC32 0xcfc435f2 Table_map: `test`.`ty` mapped to number 127
# at 343
#160229 15:18:07 server id 162 end_log_pos 463 CRC32 0xb4ef18fe Write_rows: table id 127 flags: STMT_END_F
BINLOG '
r/DTVhOiAAAANAAAAFcBAAAAAH8AAAAAAAEABHRlc3QAAnR5AAQDDw8DBBQAFAAP8jXEzw==
r/DTVh7iAAAAeAAAAM8BAAAAAH8AAAAAAAEAAgAE//AFAAAABEVFRUUCQzFfAAAA8AEAAAAEQUFB
QQJDMUMAAADwAwAAAARDQ0NDAkMxQwAAAPAEAAAABEREREQCQzFBAAAA8AIAAAAEQkJCQgJDMTcA
AAD+GO+0
'/*!*/;
# at 463
#160229 15:18:07 server id 162 end_log_pos 494 CRC32 0xed1fb95b Xid = 53

COMMIT/*!*/; -------到第一个commit为第一部分为binlog必须的，缺失会报错
# at 494
#160229 15:18:07 server id 162 end_log_pos 559 CRC32 0xef3ac14c Anonymous_GTID last_committed=1 sequence_number=2
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 559
#160229 15:18:07 server id 162 end_log_pos 631 CRC32 0xe834f1d8 Query thread_id=102887 exec_time=350 error_code=0
SET TIMESTAMP=1456730287/*!*/;
BEGIN
/*!*/;
# at 631
#160229 15:18:07 server id 162 end_log_pos 683 CRC32 0xc64ac724 Table_map: `test`.`ty` mapped to number 127
# at 683
#160229 15:18:07 server id 162 end_log_pos 803 CRC32 0x4a5f1c75 Write_rows: table id 127 flags: STMT_END_F
BINLOG '
r/DTVhOiAAAANAAAAKsCAAAAAH8AAAAAAAEABHRlc3QAAnR5AAQDDw8DBBQAFAAPJMdKxg==
r/DTVh7iAAAAeAAAACMDAAAAAH8AAAAAAAEAAgAE//AFAAAABEVFRUUCQzFfAAAA8AEAAAAEQUFB
QQJDMUMAAADwAwAAAARDQ0NDAkMxQwAAAPAEAAAABEREREQCQzFBAAAA8AIAAAAEQkJCQgJDMTcA
AAB1HF9K
'/*!*/;
# at 803
#160229 15:18:07 server id 162 end_log_pos 834 CRC32 0x96148022 Xid = 77

COMMIT/*!*/; ------到下一个commit为第二部分，一个事物语句，可以缺失
# at 834
#160229 15:18:07 server id 162 end_log_pos 899 CRC32 0xa1e52982 Anonymous_GTID last_committed=2 sequence_number=3
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 899
#160229 15:18:07 server id 162 end_log_pos 971 CRC32 0x89fc0e48 Query thread_id=102887 exec_time=359 error_code=0
SET TIMESTAMP=1456730287/*!*/;
BEGIN
/*!*/;
# at 971
#160229 15:18:07 server id 162 end_log_pos 1023 CRC32 0xc1309696 Table_map: `test`.`ty` mapped to number 127
# at 1023
#160229 15:18:07 server id 162 end_log_pos 1143 CRC32 0x0993d08b Write_rows: table id 127 flags: STMT_END_F
BINLOG '
r/DTVhOiAAAANAAAAP8DAAAAAH8AAAAAAAEABHRlc3QAAnR5AAQDDw8DBBQAFAAPlpYwwQ==
r/DTVh7iAAAAeAAAAHcEAAAAAH8AAAAAAAEAAgAE//AFAAAABEVFRUUCQzFfAAAA8AEAAAAEQUFB
QQJDMUMAAADwAwAAAARDQ0NDAkMxQwAAAPAEAAAABEREREQCQzFBAAAA8AIAAAAEQkJCQgJDMTcA
AACL0JMJ
'/*!*/;
# at 1143
#160229 15:18:07 server id 162 end_log_pos 1174 CRC32 0x7c2054fd Xid = 101

。。。。。省略

COMMIT/*!*/; -------最后一个commit到最后必须存在
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

思路就是先将第一部分以及最后一部分提取出来，我们csplite文件（以COMMIT/*!*/; 为分隔标示，不熟悉csplit命令的先去熟悉一下用法），在第一以及最后一部分中间插入单个表的binlog 信息而拼接成一个符合binlog格式的日志文件

代码如下：
[root@localhost chenliang]# more v1.sh
#!/bin/bash
# author:Jonnychen
# date:2016-3-1
# set -x

# get the key value of input
get_key_value()
{
echo "$1" | sed 's/^--[A-Za-z_-]*=//'
}

use_help()
{
cat << EOF
Info :
Author:Michael.xu
Usage :
Usage : $0 [configure-options]
-? , --help
--binlog=<> , set binlogfile
--database=<> , set database
--table=<>,set table
EOF
}

parse_options()
{
while [ $# -gt 0 ]
do
case "$1" in
--binlog=*)
vbinlog=`get_key_value "$1"`;;
--database=*)
vdatabase=`get_key_value "$1"`;;
--table=*)
vtable=`get_key_value "$1"`;;
-? | --help)
use_help
exit 0;;
*)
echo "unknown configure option '$1'"
exit 1;;
esac
shift
done
}

parse_options "$@"
echo "$vbinlog,$vdatabase,$vtable"

if [ ! -n "$vbinlog" ];then
use_help
exit
fi

if [ ! -n "$vdatabase" ];then
use_help
exit
fi

if [ ! -n "$vtable" ];then
use_help
exit
fi

#####binlog日志格式化为txt文件
mysqlbinlog_dir=`which mysqlbinlog`
${mysqlbinlog_dir} ${vbinlog}>${vbinlog}.txt
filename=${vbinlog}.txt

#####txt日志文件按照commit字段进行切割
csplit $filename /COMMIT\/*\// -n 1 -s {*} -f vcommit

cou_comm=`ls -l | grep vcommit|awk -F " " '{print $9}'|wc -l`
let "maxseq=${cou_comm}-1"
#echo $maxseq
let "sec_max=$maxseq-1"
#echo ${sec_max}

cat vcommit0>>${vbinlog}.sql #####提取第一部分

for((i=1;i<=${sec_max};i++))
do
hastab=$(grep "\`${vdatabase}\`.\`${vtable}\`" vcommit$i|wc -l ) ---循环从每个分割部分去找出单个表的信息
echo "vcommit$i:$hastab"
if [ $hastab -ge 1 ]
then
cat vcommit$i>>${vbinlog}.sql
fi
done

cat vcommit$maxseq>>${vbinlog}.sql ###提取最后一部分

rm -rf $filename vcommit*

测试：

1：mysql> select * from TEAMS; 原始数据
+--------+----------+----------+
| TEAMNO | PLAYERNO | DIVISION |
+--------+----------+----------+
| 1 | 6 | first |
| 2 | 27 | second |
| 3 | 89 | asd |
| 4 | 89 | BBBB |
| 5 | 89 | DDDD |
| 6 | 67 | GGGG |
| 7 | 77 | KKKK |
模拟此时做了个备份
mysqldump -uroot -p`cat /etc/sqlpass ` -F TENNIS>TENNIS.sql --此时binlog到了19

模拟做些操作
mysql> insert into TEAMS values(8,77,'uuuuuu');
Query OK, 1 row affected (0.00 sec)

mysql> insert into TEAMS values(9,77,'iiiiii');
Query OK, 1 row affected (0.00 sec)
mysql> insert into TEAMS values(10,77,'oooo');
Query OK, 1 row affected (0.01 sec)

mysql> update TEAMS set DIVISION='pppp' where TEAMNO in(9,10); ---误操作
Query OK, 2 rows affected (0.01 sec)
Rows matched: 2 Changed: 2 Warnings: 0

恢复：
mysql> flush logs;
Query OK, 0 rows affected (0.00 sec)

[root@localhost chenliang]# mysql -uroot -p`cat /etc/sqlpass ` TENNIS<TENNIS.sql --恢复备份

[root@localhost chenliang]# sh v1.sh --binlog=mysqlbin.000019 --database=TENNIS --table=TEAMS ---提前单表的binlog 信息

点击(此处)折叠或打开

查看提取出来的信息，删除update那部分即可
COMMIT/*!*/;
# at 704
#160301 13:55:35 server id 162 end_log_pos 769 CRC32 0x0593de75 Anonymous_GTID last_committed=2 sequence_number=3
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 769
#160301 13:55:35 server id 162 end_log_pos 843 CRC32 0x2978f290 Query thread_id=2 exec_time=0 error_code=0
SET TIMESTAMP=1456811735/*!*/;
BEGIN
/*!*/;
# at 843
#160301 13:55:35 server id 162 end_log_pos 897 CRC32 0xe52bc252 Table_map: `TENNIS`.`TEAMS` mapped to number 134
# at 897
#160301 13:55:35 server id 162 end_log_pos 946 CRC32 0x7331e254 Update_rows: table id 134 flags: STMT_END_F

BINLOG '
1y7VVhOiAAAANgAAAIEDAAAAAIYAAAAAAAEABlRFTk5JUwAFVEVBTVMAAwMD/gL+EgBSwivl
1y7VVh7iAAAAMQAAALIDAAAAAIYAAAAAAAEAAgAD//gKAAAATQAAAARvb29vVOIxcw==
'/*!*/;
# at 946
#160301 13:55:35 server id 162 end_log_pos 977 CRC32 0x7da650c4 Xid = 271
COMMIT/*!*/; ----从sql中将update的binlog信息删除即可

恢复binlog信息
[root@localhost chenliang]# mysql -uroot -p`cat /etc/sqlpass ` TENNIS<mysqlbin.000019.sql

检查
mysql> select * from TEAMS;
+--------+----------+----------+
| TEAMNO | PLAYERNO | DIVISION |
+--------+----------+----------+
| 1 | 6 | first |
| 2 | 27 | second |
| 3 | 89 | asd |
| 4 | 89 | BBBB |
| 5 | 89 | DDDD |
| 6 | 67 | GGGG |
| 7 | 77 | KKKK |
| 8 | 77 | uuuuuu |
| 9 | 77 | iiiiii |
| 10 | 77 | oooo |
+--------+----------+----------+
成功

TIP：脚本有点小bug，就是有时vcommit0 第一个begin commit可能记录的是别的表的信息而导致恢复时报错，那么就手工替换这部分的为第一个我们目标表的binlog信息再执行

向AI问一下细节

【Mysql】从binlog中找出单个表的binlog信息

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