sqlalchemy pymssql“由对等方重置连接"恢复

问题描述

我正在运行cherrypy Web服务，想知道最好的选择是通过"sqlalchemy"从对等连接重置"恢复pymssql连接.现在，我必须重新启动Web服务.

I'm running a cherrypy webservice and wondering what the best option is to recover from "connection reset by peer" for a pymssql connection via sqlalchemy. Right now I have to restart the webservice.

推荐答案

这似乎是pymssql的is_disconnect()方法中的错误，它忽略了TCP连接和超时失败，使光标处于不满意的状态；参见 http://www.sqlalchemy.org/trac/ticket/2172 .现在，您可以按照以下方式进行猴子补丁:

This seems to be a bug in the is_disconnect() method for pymssql where it ignore TCP connection and timeout failures, leaving the cursor in an unhappy state; see http://www.sqlalchemy.org/trac/ticket/2172. For now, you can monkey-patch as:

from sqlalchemy.dialects.mssql import pymssql

def is_disconnect(self, e):
    for msg in (
        "20003",
        "20004",
        "Error 10054",
        "Not connected to any MS SQL server",
        "Connection is closed"
        ):
        if msg in str(e):
            return True
    else:
        return False

pymssql.MSDialect_pymssql.is_disconnect = is_disconnect

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