adodbapi orm对象查询(三)

转载注明出处 http://blog.csdn.net/xugangjava/article/details/7565420

接上篇，写两个适配器一个用于查询Query,一个用于Execute

########################################################################
#decorators
def Query(fn):
	'''decorator　of connection 
	use this funciton can use conn to operator db
	using conn=None param to user conn'''
	def wrapper(*args, **kv):
		conn=connect()
		kv['conn']=conn
		try:
			return fn(*args, **kv)
		except:
			LogErr()
			raise
		finally:
			conn.close()
	return wrapper
def Execute(fn):
	'''decorator　of connection 
	use this funciton can use conn to operator db
	using conn=None param to user conn'''
	def wrapper(*args, **kv):
		conn=connect()
		kv['conn']=conn
		try:
			result= fn(*args, **kv)
			conn.commit()
			return result
		except:
			conn.rollback()
			LogErr()
			raise
		finally:
			conn.close()
	return wrapper

最后我们的逻辑代码

########################################################################
#proc and function
@Execute
def  procLogin(name,pwd,ip,mac,conn=None):
	cur=conn.cursor()
	uid,val,remark,opResult=0,0,'',''
	param=(name,pwd, AvailablePeopleNum,mac, Ip2Int(ip), ip,False,uid,val,remark,opResult)
	param=cur.callproc('Proc_login',param)
	uid,val,remark,opResult=param[-4],param[-3],param[-2],param[-1]
	user=None
	if val==2:user=findUserByID(conn,uid)
	return user,remark

参数conn=None在 Execute里面conn被注入值，我们的逻辑函数现在完全不用操心connection的管理了

在也没看到要吐的重复的try catch finally来管理connection了

执行完Execute里面就自动提交了，报错Execute里面就给回滚了,Query也是一样

修改一个bug where函数 对 sql > < = line的拼接有点问题

#where
def where(**kv):
	keys=''
	params=[]
	for key in kv.keys():
		if keys:keys+=' and '
		else: keys=' where '
		if key.endswith('_gt'):
			exp=key.replace('_gt',' > ')
		elif key.endswith('_lt'):
			exp=key.replace('_lt',' < ')
		elif key.endswith('_ge'):
			exp=key.replace('_ge',' >= ')
		elif key.endswith('_le'):
			exp=key.replace('_le',' <= ')
		elif key.endswith('_like'):
			exp=key.replace('_like',' like ')
		else:
			exp=key+'='
		keys+=exp+'?'
		param=kv[key]
		if isinstance(param,unicode):param=param.encode('gbk')
		params.append(param)
	return keys,tuple(params)

函数 where(id=0,row_gt=0) 返回 (where id=? and row>?,(0,0))