pymssql reconnect to db if connection dies

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Join Date: Jul 2006

Posts: 29

Reputation: msaenz is an unknown quantity at this point

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Solved Threads: 0

msaenz

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pymssql reconnect to db if connection dies

May 29th, 2008

Greetings,
I am trying to do a reconnect type of thing for when sqlserver disconnects me i check and reconnect to execute a query. here is some code that i wrote, I really don't know what to use since there is not isconnected method or reconnect method in pymssql. Any ideas or thoughts on how to implement this would be great.

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import pymssql
import pdb

#first time connected
dbConn=None
for i in range(4):
   try:
     dbConn = pymssql.connect('', 'user', 'signon', 'sqlserver01:1433')
     print "connected"
     break
   except pymssql.DatabaseError, err:
     print str(err)
     print "You have a connection issue"
     time.sleep(0.2)
   except:
     print "Another Exception occured, most likely User or Signon incorrect"
     time.sleep(0.2)

class SessionStuff():
#some more code
def Cursor():
    for i in range(4):
        try:
           c=dbConn.cursor()
           print "cursor created"
           print dbConn
           return c
           break
        except:
           print "error occured creating cursor, checking connection.."
           time.sleep(0.2)
def findPerson(name):
c=Cursor()
  for i in range(4):
        try:
           c.execute("select person from workoffice where name ='" ,name,"'"))
           result=c.fetchall()
           if len(result)==1:
              return c.fetchall()[0][0]
           else:
              return "%s:%s" % (str(host), str(port))
           break
     except pymssql.DatabaseError, err:
           print str(err)
           print "DB error retrying retrieve session"
           if "None" in str(err):
              print "created new instance of dbconnection old one dead"
              dbConn=pymssql.connect('', 'mtrader', 'mtr8d3r', 'sqldevch02:1433')
              c=dbConn.cursor()
              break
           else:
              time.sleep(0.2)

lets say i have this up and running then the database kills my connection my Cursor method still creates a cursor b/c it still has the object on there, so when it attempts to execute it goes to the except block the error: internal error: None (None) But I want to have like a reconnect attemp somewhere. I tried at the except but I still get the same issue. b/c it doesn't use the new isntance of the cursor c it still uses the old one. Any other posts or forums to direct me will be great. any help is appreciated thank you.