我正在写一个小的Python脚本/应用程序,我刚刚用SQLAlchemy把脚弄湿了。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
现在我有一个模块叫做数据库功能.py在它里面我有两个功能:
#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个函数调用。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
我有点困惑,因为我在数据库中查询所有的Player对象,查找名字与传入的playerObject
的firstName
匹配的条目,而姓氏与传入的playerObject
的lastName
匹配的条目。你知道吗
知道我为什么会犯这个错误吗?你知道吗
我最初在main()中调用了这个函数,但没有使用它,所以将其删除:
def createBase(engine):
Base = declarative_base()
Base.metadata.create_all(engine)
return Base
就像我说的:
Base = databaseFunctions.createBase(engine)
然后什么也不做。不确定这是否是问题的一部分。你知道吗
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。你知道吗
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。你知道吗
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