Question

您好我正在关注Python MYSQL update statement并设法为我的程序的SQL Update生成带有变量函数的代码：

def editInfo(start, userName):
    newFavGenre = input("Enter your favourite genre")
    newFavArtist = input("Enter your favourite artist")
    ## userName is a global variable
    con = lite.connect(db)
    cur = con.cursor()
    cur.execute ("""
    UPDATE users
    SET favGenre=%s, favArtist=%s
    WHERE username=%s
""", (newFavGenre, newFavArtist, userName))
    results = cur.fetchall()
    return result
    mainmenu()

并继续体验此错误代码：

sqlite3.OperationalError: near "%": syntax error

我出错的任何想法？

Answer 1

看来你正在看的帖子是针对MySQL的，我推测你是根据你的错误使用sqlite3 python接口。

查看sqlite3 docs ...

cur.execute("""
    UPDATE users
    SET favGenre=%s, favArtist=%s
    WHERE username=%s
""", (newFavGenre, newFavArtist, userName))

应该是

cur.execute("""
    UPDATE users
    SET favGenre=?, favArtist=?
    WHERE username=?
    """, (newFavGenre, newFavArtist, userName))

你也可以使用他们的命名样式，而不是取一个元组取词典。

cur.execute("""
    UPDATE users
    SET favGenre=:genre, favArtist=:artist
    WHERE username=:username
""", {'genre':newFavGenre, 'artist': newFavArtist, 'username':userName})

Python SQL更新语法问题

1 个答案: