pymssql 的封裝使用

本文記錄python 中sql server 的封裝及使用。

1 先封裝鏈接數據庫所需要的信息

#coding=gbk
class Configration:
    """description of class"""
    host="JINJIEGO\SQLEXPRESS"
    port=1433
    user="sa"
    pwd="123456"
    db="test"
    def __init__(self):
       pass

2 爲了避免程序中頻繁鏈接數據庫導致的資源消耗，可以創建一個全局對象，一直保持與數據庫的鏈接，將此過程封裝起來

#coding=gbk
import sys
import pymssql
from Configration import Configration 
class UniqueObject(Configration):  #only offer a support of connecting db
    """description of class"""
    cur=None
    conn=None

    def __init__(self):
        Configration.__init__(self)
    def __del__(self):
           if  self.conn!=None:
                      self.conn.close()
                      print(">>>>>>>>>>>>>>>>>Connection has been closed!<<<<<<<<<<<<<<<<<<<")
    @staticmethod
    def GetObject():
        if UniqueObject.cur==None:
            print(">>>>>>>>>>>>>>>>>Connecting to Database.....<<<<<<<<<<<<<<<<<<")
            return UniqueObject.__GetConnect()
        return UniqueObject.conn,UniqueObject.cur

    def __GetConnect():
           if not Configration.db:  raise(NameError,"no db Info")
           UniqueObject.conn =pymssql.connect(host=Configration.host,port=Configration.port,\
                      user=Configration.user,password=Configration.pwd,\
                      database=Configration.db,charset="utf8")
           UniqueObject.cur=UniqueObject.conn.cursor()
           if not UniqueObject.cur:    raise(NameError,"Connection error!")
           else: return UniqueObject.conn,UniqueObject.cur

3 封裝查詢功能，主要是ExecQuery和ExecNonQuery

#coding=gbk
import pymssql
import sys
sys.path.append(".")
from Configration import *
from UniqueObject import UniqueObject 
class MSSQL(object):
   conn,cur=UniqueObject.GetObject()
   def __init__(self):
       pass

   def __del__(self):
     #print("\n  MSSQL object has been realsed!")   
      pass
   def ExecQuery(self,sql): 
       MSSQL.cur.execute(sql)
       reslist=self.cur.fetchall()
       return reslist
   def ExecNonQuery(self,sql): 
        #try:
          MSSQL.cur.execute(sql)
          MSSQL.conn.commit()
        #except:
          #print("\nInserting exception!")

使用時，類A的相關操作可以繼承MSSQL，然後在A裏面寫相應的增刪改查操作。