python - pyodbc connect to database twice and failed -


i'm trying use python , pyodbc access sql server 2008. first connection works. then, after program finishes job, closes connection. when program tries access database , connect again, fails in statement:

self.conn = pyodbc.connect(driver=self.driver, server=self.server, database=self.database, uid=self.uid, pwd=self.pwd, charset="utf-8")

but first time ok. know why? below python code:

class odbc_ms:        def __init__(self, driver,server, database, uid, pwd):         ''' initialization '''          self.driver = driver         self.server = server         self.database = database         self.uid = uid         self.pwd = pwd       def _getconnect(self):         ''' connect db '''         if not self.database:             raise(nameerror,"no getting db name")         try:             self.conn = pyodbc.connect(driver=self.driver, server=self.server,                                        database=self.database, uid=self.uid,                                        pwd=self.pwd, charset="utf-8")         except exception,e:             print e.message         else:             self.cur = self.conn.cursor()             if not self.cur:                 raise(nameerror,"connected failed!")             else:                 return self.cur, self.conn      def execnoquery(self,conn, cursor, sql):         cursor.execute(sql)         ret = conn.commit()         return ret      def _unconnect(self,conn, cursor):         conn.close()       if __name__ == '__main__':      ms = odbc_ms('{sql server}', r'<server>', '<db>', '<user>',  '<password>')      cursor, conn = ms._getconnect() #connection      sql = "create table xx example"      ret = ms.execnoquery(conn, cursor,sql) #sql operation       ms._unconnect(conn, cursor) #close db       #access database second time.     ms = odbc_ms('{sql server}', r'<server>', '<db>', '<user>',  '<password>')      cursor, conn = ms._getconnect() # not success, don't know why      sql = "create table xx example"     ret = ms.execnoquery(conn, cursor,sql) #sql operation      ms._unconnect(conn, cursor) #close db

the second time when program calls ms.getconnect(), statement self.conn = pyodbc.connect(driver=self.driver, server=self.server, database=self.database, uid=self.uid, pwd=self.pwd, charset="utf-8") fails.


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