问题描述

我有一个大问题:运行我的 python 软件的服务器的路由器上似乎存在一些硬件问题.只有大约每三次才能成功连接到数据库.因此，psycopg2.connect() 最多可能需要 5 分钟才能获得超时异常.

I have a huge problem: There seems to be some hardware problems on the router of the server my python software runs on. The connection to the database only is successfull about every third time. So a psycopg2.connect() can take up to 5 minutes before I get an timeout exception.

2014-12-23 15:03:12,461 - ERROR - could not connect to server: Connection timed out
    Is the server running on host "172.20.19.1" and accepting

这就是我正在使用的代码.

That's the code I'm using.

# Connection to the DB
try:
    db = psycopg2.connect(host=dhost, database=ddatabase,
                          user=duser, password=dpassword)
    cursor = db.cursor(cursor_factory=psycopg2.extras.DictCursor)

except psycopg2.DatabaseError, err:
    print(str(err))
    logging.error(str(err))
    logging.info('program terminated')
    sys.exit(1)

我为查询尝试了一些超时添加，但没有帮助，因为连接根本没有建立.

I tried some timeout additions for the query, but that didn't helped, since the connection didn't got established at all.

有没有办法，当无法建立连接时，我可以立即停止程序?

Is there a way, I can stop the program immediately, when the connection couldn't be established?

推荐答案

在 connect 函数中使用关键字参数语法时，可以使用任何 libpd支持的连接参数.其中有 connect_timeout 秒:

When using the keyword arguments syntax to the connect function it is possible to use any of the libpd supported connection parameters. Among those there is connect_timeout in seconds:

db = psycopg2.connect (
    host=dhost, database=ddatabase,
    user=duser, password=dpassword,
    connect_timeout=3
)

http://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-PARAMKEYWORDS

http://initd.org/psycopg/docs/module.html

连接超时引发 OperationalError 例外.

A connection time out raises an OperationalError exception.

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