mysql_python+DBUtils 操作數據庫常見錯誤

1、

錯誤:

Mon, 11 Apr 2016 07:11:00 [18257]db_mysql.py[line:60] [data_operate] [MainThread 140295489881920] ERROR sqlINSERT INTO ansible_playbook_result(uuid) VALUES(%s); error. Traceback (mostrecent call last):

 File "/usr/local/bin/ansible_engine/src/db/db_mysql.py", line55, in data_operate

   self.cursor.execute(sql, params)

 File "/usr/lib/python2.7/site-packages/DBUtils/SteadyDB.py",line 552, in tough_method

   result = method(*args, **kwargs) # try to execute

 File "/usr/lib64/python2.7/site-packages/MySQLdb/cursors.py",line 187, in execute

   query = query % tuple([db.literal(item) for item in args])

TypeError: not all arguments convertedduring string formatting

源碼:

sql = "INSERT INTO ansible_playbook_result(uuid,result) VALUES(%s);" % constant.CREATED_STATUS
params = (uuid)
#數據庫操作函數

self.cursor.execute(sql, params)
#提交到數據庫執行
self.conn.commit()
原因及解決方法:

params = (uuid) 改爲 params = (uuid,)
這樣 params才爲元組,值爲 (uuid,)。如果不加逗號,params的值爲uuid的值。


2、

錯誤:

File "/usr/lib/python2.7/site-packages/DBUtils/SteadyDB.py", line 631, in tough_method
    raise error # reraise the original error again
OperationalError: (1054, "Unknown column 'mysql' in 'where clause'")

源碼:

sql = """SELECT uuid,config_version FROM %s WHERE name=%s;""" % (constant.CONF_SOFTWARES_TAB,
                                                                 software_name)
原因及解決方法:

name後面的%s少了單引號。

改爲 

sql = """SELECT uuid,config_version FROM %s WHERE name=%%s;""" % (constant.CONF_SOFTWARES_TAB,)
params = (software_name,)

3、

錯誤:

File"/usr/local/bin/ansible_engine/src/db/db_mysql.py", line 55, indata_operate

   self.cursor.execute(sql, params)

 File "/usr/lib/python2.7/site-packages/DBUtils/SteadyDB.py",line 631, in tough_method

   raise error # reraise the original error again

OperationalError: (1241, 'Operand shouldcontain 1 column(s)')

源碼:

sql = """UPDATE %s SET `children_tasks`=%%s WHERE (`task_id`=%%s);""" % constant.TASK_GATHER_TAB
params = (uuid_list,task_uuid)
uuid_list是一個列表。
原因及解決方法:
寫入數據庫的數據必須爲字符串
params = (json.dumps(uuid_list),task_uuid)


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