在python中使用sqlite使用cursor.execute和cursor.fetchall問題

Question

我有問題將所有註釋列表作爲我的代碼中的元組返回。以下是我有：

def list_comments(db, limit=None): 
    """return a list of all comments as tuples 

     - tuples are (id, useremail, page, comment) 
     if limit is provided it should be an integer and only that 
     many comments will be returned 
    """ 

    cursor.execute("SELECT * FROM comments") 
    manyresults = cursor.fetchall() 

    for row in cursor: 
     return row 

那麼我現在要做的是從我的意見表中選擇的一切，返回它：

CREATE TABLE comments (
     id integer unique primary key autoincrement, 
     useremail text, 
     page text, 
     comment text, 
     FOREIGN KEY(useremail) REFERENCES users(email) 
);""" 

我很新的這一切，所以如果我完全錯誤，請讓我知道我在做什麼錯了。謝謝！

編輯：這是一個測試，我跑這對

def test_list_comments(self): 
    """The list_comments procedure should return a list of tuples 
    one for each of the comment entries in the database, each tuple 
    should contain """ 

    clist = interface.list_comments(self.db) 

    # we should have the same number of comments as we created 
    self.assertEquals(len(clist), len(self.comments), "Wrong number of comments returned from list_units, expected %d, got %d" % (len(self.comments), len(clist))) 

    # comments should be in order so the largest id should be first 
    self.assertEquals(clist[0][0], self.comments[-1][0], "Wrong comment id first in comment list, expected %d, got %d" % (clist[0][0], self.comments[-1][0])) 

    # and the comment list should be ordered by id 
    ids = [c[0] for c in clist] 
    self.assertEqual(sorted(ids, reverse=True), ids, "List of comments returned is not in large-to-small order: %s" % (ids,)) 

    # try the limit argument 
    clist = interface.list_comments(self.db, 3) 
    self.assertEquals(len(clist), 3, "Wrong number of comments returned from list_comments with a limit argument, expected 3, got %d" % (len(clist),)) 

Answer 1

你有幾個問題：

1. 你沒有做任何事情與cursor.fetchall()
2. 結果你是唯一返回第一個結果，不是全部

我想什麼y OU需要的是：

cursor.execute("SELECT * FROM comments") 
manyresults = cursor.fetchall() 
return list(manyresults) 

雖然你也可以這樣做：

return list(cursor.execute("SELECT * FROM comments"))