当使用 pyodbc 游标执行时,备份语句不能在事务中使用。 pyodbc 似乎在默认事务内执行查询。
我也尝试过使用自动提交模式或在备份语句之前添加提交语句。这两个都不起作用。
#can't execute the backup statement in transaction
cur.execute("backup database database_name to disk = 'backup_path'")
#not working too
cur.execute("commit;backup database database_name to disk = 'backup_path'")
是否可以通过pyodbc执行备份语句?提前致谢!
-----添加了附加信息------------------------------------------ ----------------------------
备份操作封装在一个函数中,例如:
def backupdb(con, name, save_path):
# with autocommit mode, should be pyodbc.connect(con, autocommit=True)
con = pyodbc.connect(con)
query = "backup database %s to disk = '%s'" % (name, save_path)
cur = con.cursor()
cur.execute(query)
cur.commit()
con.close()
如果通过以下代码调用该函数,
backupdb('DRIVER={SQL Server};SERVER=.\sqlexpress;DATABASE=master;Trusted_Connection=yes',
'DatabaseName',
'd:\\DatabaseName.bak')
那么例外将是:
File "C:/Documents and Settings/Administrator/Desktop/bakdb.py", line 14, in <module>'d:\\DatabaseName.bak')
File "C:/Documents and Settings/Administrator/Desktop/bakdb.py", line 7, in backupdb cur.execute(query)
ProgrammingError: ('42000', '[42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Cannot perform a backup or restore operation within a transaction. (3021) (SQLExecDirectW); [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]BACKUP DATABASE is terminating abnormally. (3013)')
打开关键字autocommit=True,该函数将静默运行,但备份文件夹中不会生成备份文件。