MySQL沒有Oracle的閃回(flashback)功能，如果不小心執行了UPDATE或者DELETE誤操作，想要回滾相比Oracle還是挺麻煩的
可以利用mysqlbinlog工具解析binlog，從而拼接出UPDATE和DELETE的回滾語句，人工拼接比較麻煩，所以利用Python來拼接
import io
import pymysql
def processUPDATE(db_name,table_name):
conn = pymysql.connect("192.168.56.10", "scott", "tiger", "db")
cur = conn.cursor()
cur.arraysize = 100
sql = "select column_name from information_schema.COLUMNS " \
"where table_schema='" + db_name + "' and table_name='" + table_name + "' order by ordinal_position"
cur.execute(sql)
rows = cur.fetchall()
num_column = len(rows)
binlogfile = open('binlog.txt', 'r', newline='', encoding='utf8')
updatefile = open('redo_update.sql', 'w', newline='', encoding='utf8')
rollbackfile = open('undo_update.sql', 'w', newline='', encoding='utf8')
while True:
row = binlogfile.readline()
update = []
where = []
rollback_set = []
rollback_where = []
set = []
i_total = 1
i_where = 1
i_set = 1
update.append(row.replace('#', '').replace('`', '').replace('\n', ''))
if ('UPDATE' in row) and (db_name in row) and (table_name in row):
while i_total < num_column * 2 + 3:
row = binlogfile.readline()
if i_where < num_column + 2:
where.append(row.replace('#', '').replace('`', '').replace('\n', '').replace('=NULL', ' IS NULL').replace(
'@' + str(i_where - 1), rows[i_where - 2][0]))
rollback_set.append(row.replace('#', '').replace('`', '').replace('\n', '').replace('@' + str(i_where - 1),
rows[i_where - 2][0]).replace(
'WHERE', 'SET'))
if num_column > 1 and i_where > 1 and i_where < num_column + 1:
where.append(' AND ')
rollback_set.append(',')
if i_where == num_column + 1:
where.append(';')
if i_set >= num_column + 2:
set.append(row.replace('#', '').replace('`', '').replace('\n', '').replace('@' + str(i_set - 2 - num_column), rows[i_set - 3 - num_column][0]))
rollback_where.append(
row.replace('#', '').replace('`', '').replace('\n', '').replace('@' + str(i_set - 2 - num_column),
rows[i_set - 3 - num_column][0]).replace('SET','WHERE').replace('=NULL', ' IS NULL'))
if num_column > 1 and i_set > num_column + 2 and i_set < num_column * 2 + 2:
set.append(',')
rollback_where.append(' AND ')
if i_total == num_column * 2 + 2:
rollback_where.append(';')
i_total = i_total + 1
i_where = i_where + 1
i_set = i_set + 1
statement = ''.join(update) + ''.join(set) + ''.join(where)
rollback = ''.join(update) + ''.join(rollback_set) + ''.join(rollback_where)
updatefile.writelines(
statement.replace(' ', ' ').replace(', ', ',').replace('SET ', 'SET ').replace('WHERE ', 'WHERE ').replace(
'AND ', 'AND ') + '\n')
rollbackfile.writelines(
rollback.replace(' ', ' ').replace(', ', ',').replace('SET ', 'SET ').replace('WHERE ', 'WHERE ').replace(
'AND ', 'AND ') + '\n')
if not row:
break
cur.close()
conn.close()
updatefile.close()
binlogfile.close()
rollbackfile.close()
print('redo_update.sql是原始SQL')
print('undo_update.sql是回滾SQL')
return
def processDELETE(db_name,table_name):
conn = pymysql.connect("192.168.56.10", "scott", "tiger", "db")
cur = conn.cursor()
cur.arraysize = 100
sql = "select column_name from information_schema.COLUMNS " \
"where table_schema='" + db_name + "' and table_name='" + table_name + "' order by ordinal_position"
cur.execute(sql)
rows = cur.fetchall()
num_column = len(rows)
binlogfile = open('binlog.txt', 'r', newline='', encoding='utf8')
deletefile = open('delete.sql','w',newline='',encoding='utf8')
insertfile = open('insert.sql','w',newline='',encoding='utf8')
while True:
row = binlogfile.readline()
i = 0
delete = []
insert =[]
where = []
values =[]
column = []
value = []
delete.append(row.replace('#', '').replace('`', '').replace('\n', ''))
insert.append(row.replace('#', '').replace('`', '').replace('\n', '').replace('DELETE FROM','INSERT INTO'))
if 'DELETE' in row and db_name in row and table_name in row:
while i < num_column + 1:
row = binlogfile.readline()
if i == 0:
where.append(row.replace('#', '').replace('\n', ''))
values.append(row.replace('#', '').replace('\n', '').replace('WHERE','VALUES('))
if i > 0:
column.append(row.replace('#', '').replace('@' + str(i), rows[i - 1][0]).replace('\n', '').replace('=NULL', ' IS NULL'))
value.append(row.replace('#', '').replace('@' + str(i)+'=','').replace('\n',''))
if num_column > 1 and i >= 1 and i < num_column:
column.append(' AND ')
value.append(',')
if i == num_column:
column.append(';')
value.append(' );')
i = i + 1
delete_sql = ''.join(delete) + ''.join(where) + ''.join(column).replace(' ', '').replace(', ', ',')
deletefile.writelines(delete_sql+'\n')
insert_sql =''.join(insert)+''.join(values)+''.join(value).replace(' ','').replace(', ',',')
insertfile.writelines(insert_sql+'\n')
if not row:
break
cur.close()
conn.close()
binlogfile.close()
deletefile.close()
insertfile.close()
print('delete.sql是原始SQL')
print('insert.sql是回滾SQL')
return
processUPDATE('db','emp_bak')
processDELETE('db','emp_bak')
UPDATE誤操作恢復示例：
mysql> select * from emp;
+-------+--------+-----------+------+---------------------+---------+---------+--------+
| empno | ename | job | mgr | hiredate | sal | comm | deptno |
+-------+--------+-----------+------+---------------------+---------+---------+--------+
| 7369 | 沙雕 | CLERK | 7902 | 1980-12-17 00:00:00 | 800.00 | NULL | 20 |
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600.00 | 300.00 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.00 | 500.00 | 30 |
| 7566 | JONES | MANAGER | 7839 | 1981-04-02 00:00:00 | 2975.00 | NULL | 20 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250.00 | 1400.00 | 30 |
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.00 | NULL | 30 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.00 | NULL | 10 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 00:00:00 | 3000.00 | NULL | 20 |
| 7839 | KING | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000.00 | NULL | 10 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.00 | 0.00 | 30 |
| 7876 | ADAMS | CLERK | 7788 | 1987-05-23 00:00:00 | 1100.00 | NULL | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950.00 | NULL | 30 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.00 | NULL | 20 |
| 7934 | MILLER | CLERK | 7782 | 1982-01-23 00:00:00 | 1300.00 | NULL | 10 |
+-------+--------+-----------+------+---------------------+---------+---------+--------+
14 rows in set (0.00 sec)
mysql> update emp set ename='沙雕';
Query OK, 13 rows affected (0.01 sec)
Rows matched: 14 Changed: 13 Warnings: 0
mysql> show binlog events in 'binlog.000002' limit 55,10;
+---------------+------+----------------+-----------+-------------+--------------------------------------+
| Log_name | Pos | Event_type | Server_id | End_log_pos | Info |
+---------------+------+----------------+-----------+-------------+--------------------------------------+
| binlog.000002 | 4111 | Write_rows | 1 | 4151 | table_id: 105 flags: STMT_END_F |
| binlog.000002 | 4151 | Xid | 1 | 4182 | COMMIT /* xid=352 */ |
| binlog.000002 | 4182 | Anonymous_Gtid | 1 | 4261 | SET @@SESSION.GTID_NEXT= 'ANONYMOUS' |
| binlog.000002 | 4261 | Query | 1 | 4343 | BEGIN |
| binlog.000002 | 4343 | Table_map | 1 | 4411 | table_id: 102 (db.emp) |
| binlog.000002 | 4411 | Update_rows | 1 | 5420 | table_id: 102 flags: STMT_END_F |
| binlog.000002 | 5420 | Xid | 1 | 5451 | COMMIT /* xid=355 */ |
+---------------+------+----------------+-----------+-------------+--------------------------------------+
7 rows in set (0.01 sec)
mysqlbinlog binlog.000002 -v -d db --start-position=4343 --stop-position=5420 > binlog.txt
將binlog.txt傳輸到C:\Python\project\目錄
C:\Python\project>python processbinlog.py
redo_update.sql是原始SQL
undo_update.sql是回滾SQL
執行undo_update.sql
mysql> UPDATE db.emp SET empno=7499,ename='ALLEN',job='SALESMAN',mgr=7698,hiredate='1981-02-20 00:00:00',sal=1600.00,comm=300.00,deptno=30 WHERE empno=7499 AND ename='沙雕' AND job='SALESMAN' AND mgr=7698 AND hiredate='1981-02-20 00:00:00' AND sal=1600.00 AND comm=300.00 AND deptno=30;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7521,ename='WARD',job='SALESMAN',mgr=7698,hiredate='1981-02-22 00:00:00',sal=1250.00,comm=500.00,deptno=30 WHERE empno=7521 AND ename='沙雕' AND job='SALESMAN' AND mgr=7698 AND hiredate='1981-02-22 00:00:00' AND sal=1250.00 AND comm=500.00 AND deptno=30;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7566,ename='JONES',job='MANAGER',mgr=7839,hiredate='1981-04-02 00:00:00',sal=2975.00,comm=NULL,deptno=20 WHERE empno=7566 AND ename='沙雕' AND job='MANAGER' AND mgr=7839 AND hiredate='1981-04-02 00:00:00' AND sal=2975.00 AND comm IS NULL AND deptno=20;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7654,ename='MARTIN',job='SALESMAN',mgr=7698,hiredate='1981-09-28 00:00:00',sal=1250.00,comm=1400.00,deptno=30 WHERE empno=7654 AND ename='沙雕' AND job='SALESMAN' AND mgr=7698 AND hiredate='1981-09-28 00:00:00' AND sal=1250.00 AND comm=1400.00 AND deptno=30;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7698,ename='BLAKE',job='MANAGER',mgr=7839,hiredate='1981-05-01 00:00:00',sal=2850.00,comm=NULL,deptno=30 WHERE empno=7698 AND ename='沙雕' AND job='MANAGER' AND mgr=7839 AND hiredate='1981-05-01 00:00:00' AND sal=2850.00 AND comm IS NULL AND deptno=30;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7782,ename='CLARK',job='MANAGER',mgr=7839,hiredate='1981-06-09 00:00:00',sal=2450.00,comm=NULL,deptno=10 WHERE empno=7782 AND ename='沙雕' AND job='MANAGER' AND mgr=7839 AND hiredate='1981-06-09 00:00:00' AND sal=2450.00 AND comm IS NULL AND deptno=10;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7788,ename='SCOTT',job='ANALYST',mgr=7566,hiredate='1987-04-19 00:00:00',sal=3000.00,comm=NULL,deptno=20 WHERE empno=7788 AND ename='沙雕' AND job='ANALYST' AND mgr=7566 AND hiredate='1987-04-19 00:00:00' AND sal=3000.00 AND comm IS NULL AND deptno=20;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7839,ename='KING',job='PRESIDENT',mgr=NULL,hiredate='1981-11-17 00:00:00',sal=5000.00,comm=NULL,deptno=10 WHERE empno=7839 AND ename='沙雕' AND job='PRESIDENT' AND mgr IS NULL AND hiredate='1981-11-17 00:00:00' AND sal=5000.00 AND comm IS NULL AND deptno=10;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7844,ename='TURNER',job='SALESMAN',mgr=7698,hiredate='1981-09-08 00:00:00',sal=1500.00,comm=0.00,deptno=30 WHERE empno=7844 AND ename='沙雕' AND job='SALESMAN' AND mgr=7698 AND hiredate='1981-09-08 00:00:00' AND sal=1500.00 AND comm=0.00 AND deptno=30;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7876,ename='ADAMS',job='CLERK',mgr=7788,hiredate='1987-05-23 00:00:00',sal=1100.00,comm=NULL,deptno=20 WHERE empno=7876 AND ename='沙雕' AND job='CLERK' AND mgr=7788 AND hiredate='1987-05-23 00:00:00' AND sal=1100.00 AND comm IS NULL AND deptno=20;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7900,ename='JAMES',job='CLERK',mgr=7698,hiredate='1981-12-03 00:00:00',sal=950.00,comm=NULL,deptno=30 WHERE empno=7900 AND ename='沙雕' AND job='CLERK' AND mgr=7698 AND hiredate='1981-12-03 00:00:00' AND sal=950.00 AND comm IS NULL AND deptno=30;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7902,ename='FORD',job='ANALYST',mgr=7566,hiredate='1981-12-03 00:00:00',sal=3000.00,comm=NULL,deptno=20 WHERE empno=7902 AND ename='沙雕' AND job='ANALYST' AND mgr=7566 AND hiredate='1981-12-03 00:00:00' AND sal=3000.00 AND comm IS NULL AND deptno=20;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> UPDATE db.emp SET empno=7934,ename='MILLER',job='CLERK',mgr=7782,hiredate='1982-01-23 00:00:00',sal=1300.00,comm=NULL,deptno=10 WHERE empno=7934 AND ename='沙雕' AND job='CLERK' AND mgr=7782 AND hiredate='1982-01-23 00:00:00' AND sal=1300.00 AND comm IS NULL AND deptno=10;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from emp;
+-------+--------+-----------+------+---------------------+---------+---------+--------+
| empno | ename | job | mgr | hiredate | sal | comm | deptno |
+-------+--------+-----------+------+---------------------+---------+---------+--------+
| 7369 | 沙雕 | CLERK | 7902 | 1980-12-17 00:00:00 | 800.00 | NULL | 20 |
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600.00 | 300.00 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.00 | 500.00 | 30 |
| 7566 | JONES | MANAGER | 7839 | 1981-04-02 00:00:00 | 2975.00 | NULL | 20 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250.00 | 1400.00 | 30 |
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.00 | NULL | 30 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.00 | NULL | 10 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 00:00:00 | 3000.00 | NULL | 20 |
| 7839 | KING | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000.00 | NULL | 10 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.00 | 0.00 | 30 |
| 7876 | ADAMS | CLERK | 7788 | 1987-05-23 00:00:00 | 1100.00 | NULL | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950.00 | NULL | 30 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.00 | NULL | 20 |
| 7934 | MILLER | CLERK | 7782 | 1982-01-23 00:00:00 | 1300.00 | NULL | 10 |
+-------+--------+-----------+------+---------------------+---------+---------+--------+
14 rows in set (0.00 sec)