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
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
------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
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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