python - 使用 sqlite OperationalError : no such column 创建函数

Question

我想创建一个函数，我可以输入电影的类型和我想看到的顶行数。

我已经用sqlite建立了数据库。但是我不知道如何使用sqlite中的函数input。

我的代码:

def get_top_genre_actors(genre, k):

    c.execute('''SELECT ma.actor, m.rating FROM movie_actor ma
    LEFT JOIN movie m ON ma.imdb_id = m.imdb_id
    ORDER BY m.rating DESC, ma.actor
    LIMIT int(k)
    ''') 
    conn.commit()
    get_top = c.fetchall()

    print("Top 10 actors who played in highest rated ", genre, " movies:")
    print("Actor, Average ", genre, " movie rating")
    for x in get_top:
        print(x[0],', ', x[1],sep="")

get_top_genre_actors("Drama", 5)

我得到的结果:

OperationalError: no such column: k

我知道错误的行是

LIMIT int(k)

如何做到正确？

Answer 1

你应该使用 placeholders .

def get_top_genre_actors(genre, k):
    c.execute('''SELECT ma.actor, m.rating FROM movie_actor ma
    LEFT JOIN movie m ON ma.imdb_id = m.imdb_id
    ORDER BY m.rating DESC, ma.actor
    LIMIT ?
    ''', (k,))
    ...