Python SQLAlchemy：查询我的数据库有困难

我正在写一个小的Python脚本/应用程序，我的脚刚刚被SQLAlchemy弄湿了。我唯一的职业是“玩家”，定义如下：

class Player:
    def __init__(self,  rating, college, ranking = None, firstName = None, lastName = None):
        self.rating = rating
        self.college = college
        self.ranking = ranking
        self.firstName = firstName
        self.lastName = lastName

现在我有一个名为databaseFunctions.py的模块，其中有两个函数：

#if player exists, update his rating and ranking; otherwise, add new object to DB
def updateSpecificDBEntry(playerObject, session):
    #find player in DB with firstName and lastName
    currentPlayer = session.query(Player).filter(firstName == playerObject.firstName).filter(playerObject.lastName == lastName).first()
    #set rating = newRating
    if currentPlayer.count():
        currentPlayer.rating = playerObject.rating
        currentPlayer.ranking = playerObject.ranking
    else:
        addEntryToDB(playerObject, session)

def updateEntireDB(arrayOfPlayerObjects, session):
    for player in arrayOfPlayerObjects:
        updateSpecificDBEntry(player, session)

以下是我的主要方法：

def main():
    #create engine (for use by base and session)
    engine = databaseFunctions.createEngine()
    #create session
    session = databaseFunctions.createSession(engine)
    #get all players from CSA website
    allPlayers = getSortedGender(constants.mainURL, constants.menTeams)
    databaseFunctions.updateEntireDB(allPlayers, session)

我的代码实际上一直工作到最后一次函数调用。此时，我得到以下错误：

  File "helpfulFunctions.py", line 114, in <module>
    main()
  File "helpfulFunctions.py", line 107, in main
    databaseFunctions.updateEntireDB(allPlayers, session)
  File "/Users/benjaminclayman/Desktop/SquashScraper/databaseFunctions.py", line 42, in updateEntireDB
    updateSpecificDBEntry(player, session)
  File "/Users/benjaminclayman/Desktop/SquashScraper/databaseFunctions.py", line 32, in updateSpecificDBEntry
    currentPlayer = session.query(Player).filter(firstName == playerObject.firstName).filter(playerObject.lastName == lastName).first()
NameError: global name 'firstName' is not defined

正如我刚才所说：

Base = databaseFunctions.createBase(engine)

然后不使用

Base

。不确定这是否是问题的一部分

谢谢你的帮助，

---

b外行

在updateSpecificDBEntry筛选器中，您有：

.filter（firstName==playerObject.firstName）

变量“firstName”不存在

看起来你的意思是：

currentPlayer=session.query（Player）.filter（Player.firstName==playerObject.firstName）.filter（playerObject.lastName==Player.lastName）.first（）

因此，您正在根据给定的playerObject属性筛选一个Player列

Base = databaseFunctions.createBase(engine)