Question

我目前正在运行一个脚本，使用execute many函数将值（元组列表）插入MySQL数据库。当我使用少量行（`1000）时，脚本运行正常。

当我使用大约40,000行时，我收到以下错误：

cursor.executemany( stmt, trans_frame)
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\IPython\core\interactiveshell.py", line 2538, in run_code
    exec code_obj in self.user_global_ns, self.user_ns
  File "<ipython-input-1-66b44e71cf5a>", line 1, in <module>
    cursor.executemany( stmt, trans_frame)
  File "C:\Python27\lib\site-packages\MySQLdb\cursors.py", line 253, in executemany
    r = self._query('\n'.join([query[:p], ',\n'.join(q), query[e:]]))
  File "C:\Python27\lib\site-packages\MySQLdb\cursors.py", line 346, in _query
    rowcount = self._do_query(q)
  File "C:\Python27\lib\site-packages\MySQLdb\cursors.py", line 310, in _do_query
    db.query(q)
OperationalError: (2006, 'MySQL server has gone away')

有什么建议吗？

Answer 1

您可以尝试设置max_allowed_packet参数just for one session：

sql ='SET SESSION max_allowed_packet=500M'
cursor.execute(sql)
sql = ...
args = ...
cursor.executemany(sql, args)

如果这样可行，您可以保留代码，或者更改my.cnf文件（知道这解决了executemany问题）。

Answer 2

sql ='SET GLOBAL max_allowed_packet=500*1024*1024'
cursor.execute(sql)

针对大量行的MySQLdb错误执行executemany

2 个答案: