解析MySQL binlog --ROWS_EVENT:WRITE_ROWS_EVENTUP

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1、介绍

对于statement格式的binlog,所有增删改的SQL语句都记录在QUERY_EVENT中,而row格式的binlog则以ROWS_EVENT格式记录对数据库的修改。ROWS_EVENT分为3种:WRITE_ROWS_EVENT、UPDATE_ROWS_EVENT、DELETE_ROWS_EVENT,分别对应insert、update、delete。WRITE_ROWS_EVENT包含了要插入的数据;UPDATE_ROWS_EVENT不仅包含行修改后的值,也包括修改前的值;DELETE_ROWS_EVENT仅仅记录删除行的主键值。
2、定义格式
技术分享图片
3、案例讲解

mysql> show binlog events in "mysql-bin.000002";
+------------------+------+-------------+-----------+-------------+-----------------------------------------------------------------+
| Log_name         | Pos  | Event_type  | Server_id | End_log_pos | Info                                                            |
+------------------+------+-------------+-----------+-------------+-----------------------------------------------------------------+
| mysql-bin.000002 |    4 | Format_desc |        11 |         120 | Server ver: 5.6.26-debug-log, Binlog ver: 4                     |
| mysql-bin.000002 |  120 | Query       |        11 |         191 | BEGIN                                                           |
| mysql-bin.000002 |  191 | Table_map   |        11 |         236 | table_id: 70 (yzs.t1)                                           |
| mysql-bin.000002 |  236 | Write_rows  |        11 |         280 | table_id: 70 flags: STMT_END_F                                  |
| mysql-bin.000002 |  280 | Xid         |        11 |         311 | COMMIT /* xid=9 */                                              |
| mysql-bin.000002 |  311 | Query       |        11 |         382 | BEGIN                                                           |
| mysql-bin.000002 |  382 | Table_map   |        11 |         427 | table_id: 70 (yzs.t1)                                           |
| mysql-bin.000002 |  427 | Write_rows  |        11 |         471 | table_id: 70 flags: STMT_END_F                                  |
| mysql-bin.000002 |  471 | Xid         |        11 |         502 | COMMIT /* xid=37 */                                             |
| mysql-bin.000002 |  502 | Query       |        11 |         573 | BEGIN                                                           |
| mysql-bin.000002 |  573 | Table_map   |        11 |         618 | table_id: 70 (yzs.t1)                                           |
| mysql-bin.000002 |  618 | Write_rows  |        11 |         662 | table_id: 70 flags: STMT_END_F                                  |
| mysql-bin.000002 |  662 | Xid         |        11 |         693 | COMMIT /* xid=46 */                                             |
| mysql-bin.000002 |  693 | Query       |        11 |         764 | BEGIN                                                           |
| mysql-bin.000002 |  764 | Table_map   |        11 |         809 | table_id: 70 (yzs.t1)                                           |
| mysql-bin.000002 |  809 | Write_rows  |        11 |         853 | table_id: 70 flags: STMT_END_F                                  |
| mysql-bin.000002 |  853 | Xid         |        11 |         884 | COMMIT /* xid=47 */                                             |
| mysql-bin.000002 |  884 | Query       |        11 |         955 | BEGIN                                                           |
| mysql-bin.000002 |  955 | Table_map   |        11 |        1000 | table_id: 70 (yzs.t1)                                           |
| mysql-bin.000002 | 1000 | Write_rows  |        11 |        1044 | table_id: 70 flags: STMT_END_F                                  |
| mysql-bin.000002 | 1044 | Xid         |        11 |        1075 | COMMIT /* xid=56 */                                             |
| mysql-bin.000002 | 1075 | Query       |        11 |        1199 | use `yzs`; create table t2(id1 int primary key,id2 int,id3 int) |
| mysql-bin.000002 | 1199 | Query       |        11 |        1270 | BEGIN                                                           |
| mysql-bin.000002 | 1270 | Table_map   |        11 |        1316 | table_id: 71 (yzs.t2)                                           |
| mysql-bin.000002 | 1316 | Write_rows  |        11 |        1364 | table_id: 71 flags: STMT_END_F                                  |
| mysql-bin.000002 | 1364 | Xid         |        11 |        1395 | COMMIT /* xid=59 */                                             |
| mysql-bin.000002 | 1395 | Query       |        11 |        1466 | BEGIN                                                           |
| mysql-bin.000002 | 1466 | Table_map   |        11 |        1512 | table_id: 71 (yzs.t2)                                           |
| mysql-bin.000002 | 1512 | Delete_rows |        11 |        1560 | table_id: 71 flags: STMT_END_F                                  |
| mysql-bin.000002 | 1560 | Xid         |        11 |        1591 | COMMIT /* xid=60 */                                             |
| mysql-bin.000002 | 1591 | Query       |        11 |        1662 | BEGIN                                                           |
| mysql-bin.000002 | 1662 | Table_map   |        11 |        1708 | table_id: 71 (yzs.t2)                                           |
| mysql-bin.000002 | 1708 | Write_rows  |        11 |        1756 | table_id: 71 flags: STMT_END_F                                  |
| mysql-bin.000002 | 1756 | Xid         |        11 |        1787 | COMMIT /* xid=63 */                                             |
+------------------+------+-------------+-----------+-------------+-----------------------------------------------------------------+
34 rows in set (0.00 sec)

3.1 insert
mysqlbinlog工具看到的日志:

# at 1316  
#180324 23:03:59 server id 11  end_log_pos 1364 CRC32 0xb23b2d4f    Write_rows: table id 71 flags: STMT_END_F  

BINLOG ‘  
zzu3WhMLAAAALgAAACQFAAAAAEcAAAAAAAEAA3l6cwACdDIAAwMDAwAGU9yKKQ==  
zzu3Wh4LAAAAMAAAAFQFAAAAAEcAAAAAAAEAAgAD//gBAAAAAQAAAAEAAABPLTuy  
‘/*!*/;  
### INSERT INTO `yzs`.`t2`  
### SET  
###   @1=1 /* INT meta=0 nullable=0 is_null=0 */  
###   @2=1 /* INT meta=0 nullable=1 is_null=0 */  
###   @3=1 /* INT meta=0 nullable=1 is_null=0 */  
# at 1364  

技术分享图片
------公有事件头-----

1)timestamp:cf 3b b7 5a,4个字节

2)event_type:1e,1个字节,WRITE_ROWS_EVENT = 30

3)server-id:0b 00 00 00,4个字节即11

4)event_size:30 00 00 00,4个字节,即该event总大小是48字节

5)next-log pos:54 05 00 00,4个字节,即下一个log的位置是1364字节位置

6)flag:00 00

-------私有事件头------

7)table ID:47 00 00 00 00 00,6个字节,即71

8)flag:01 00,2个字节,可以包含以下信息。该事件是否是语句的最后一个事件,是否需要进行外键约束检查,针对innodb的二级索引是否需要进行唯一性检查,该事件是否包含了完整一行数据也就是说覆盖了所有列。

9)Var-size header len:02 00

10)RW_V_EXTRAINFO_TAG、m_extra_row_data:没有

---------事件体---------

11)列个数:03,即3个列

12)columns-present-bitmap:ff,包含了所有列的数据

13)null-bitmap:f8,即1111 1000,即3个列都不是NULL

14)列值:01 00 00 00 01 00 00 00 01 00 00 00,即3个列的值是1,1,1

15)checksum:4f 2d 3b b2

2.2 delete

# at 1512  
#180325  0:19:45 server id 11  end_log_pos 1560 CRC32 0xc6b58a5e    Delete_rows: table id 71 flags: STMT_END_F  

BINLOG ‘  
kU23WhMLAAAALgAAAOgFAAAAAEcAAAAAAAEAA3l6cwACdDIAAwMDAwAG0hGsLw==  
kU23WiALAAAAMAAAABgGAAAAAEcAAAAAAAEAAgAD//gBAAAAAQAAAAEAAABeirXG  
‘/*!*/;  
### DELETE FROM `yzs`.`t2`  
### WHERE  
###   @1=1 /* INT meta=0 nullable=0 is_null=0 */  
###   @2=1 /* INT meta=0 nullable=1 is_null=0 */  
###   @3=1 /* INT meta=0 nullable=1 is_null=0 */  
# at 1560  

技术分享图片
和insert的类型差不多,这里只看最后存的值:

f8 01 00 00 00 01 00 00 00 01 00 00 00

即存储的是delete的行值。

update类似,就不再使用案例讲解,感兴趣的可以按照格式解析。

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