psycopg2.ProgrammingError：列「none」不存在 - 更新語句

Question

我一直遇到錯誤「psycopg2.ProgrammingError：column」none「does not exist」。

我已閱讀psycopg2 documentation看着這個錯誤的其他職位，但許多特定於插入查詢而非更新查詢。

我的代碼如下： -

def send_to_sql(identity,list1,list2,list3): 
    userid = 30 
    Fixture_No = None 
    Home_Side_Score = None 
    Away_Side_Score = None 
    conn = psycopg2.connect("dbname='Euro2016' user='postgres' host='localhost' password='##passwordhere##'") 
    cur = conn.cursor() 
    cur.execute("""UPDATE "Predictions" SET userid = %r, "Fixture_No" = %r, "Home_Side_Score" = %r, "Away_Side_Score" = %r WHERE "Predictions"."userid" = %r AND "Predictions"."Fixture_No" = %r """ % (userid, Fixture_No, Home_Side_Score, Away_Side_Score, userid, Fixture_No)) 
    conn.commit() 
    cur.close() 
    conn.close() 

此代碼工作正常，如果我試圖通過分數和固定數量的數字，但是當無條目被，代碼落在它的臉上。有人救我...

Answer 1

使用%s而不是%r。要檢查什麼被髮送到服務器使用cursor. mogrify：

update = """ 
    UPDATE "Predictions" 
    SET 
     userid = %s, 
     "Fixture_No" = %s, 
     "Home_Side_Score" = %s, 
     "Away_Side_Score" = %s 
    WHERE 
     "Predictions"."userid" = %s AND 
     "Predictions"."Fixture_No" = %s 
""" 
data = (userid, Fixture_No, Home_Side_Score, Away_Side_Score, userid, Fixture_No) 
print cur.mogrify(update, data) 
cur.execute(update, data) 

仍然較好，使用字典來傳遞數據：

update = """ 
    UPDATE "Predictions" 
    SET 
     userid = %(userid)s, 
     "Fixture_No" = %(Fixture_no)s, 
     "Home_Side_Score" = %(Home_Side_Score)s, 
     "Away_Side_Score" = %(Away_Side_Score)s 
    WHERE 
     "Predictions"."userid" = %(userid)s AND 
     "Predictions"."Fixture_No" = %(Fixture_No)s 
""" 
data = dict (
    userid = userid, 
    Fixture_No = Fixture_No, 
    Home_Side_Score = Home_Side_Score, 
    Away_Side_Score = Away_Side_Score 
)