如何保存我的SQL列在Python中的順序？

Question

如果你稍微向下滾動，你可以從g.d.d.c return SQL table as JSON in python看到這樣的代碼：

qry = "Select Id, Name, Artist, Album From MP3s Order By Name, Artist" 
# Assumes conn is a database connection. 
cursor = conn.cursor() 
cursor.execute(qry) 
rows = [x for x in cursor] 
cols = [x[0] for x in cursor.description] 
songs = [] 
for row in rows: 
    song = {} 
    for prop, val in zip(cols, row): 
    song[prop] = val 
    songs.append(song) 
# Create a string representation of your array of songs. 
songsJSON = json.dumps(songs) 

我只想讓我的列的順序。

例如，當我print(cols)我得到這個：

['id', 'Color', 'YCoord', 'Width', 'Height'] # right order 

但列被保存在一個錯誤的順序：

[{"Color": "#FF99FF","Width"=345, "id"=43, "YCoord"=5784 "Height"=-546}...] # wrong order 

列更多的添加，更隨意就愈大。

Answer 1

Python dict不保存按鍵的順序，改爲使用OrderedDict。

Answer 2

如果我明白你想要字典有訂購的關鍵。這是不可能的，因爲字典沒有按照某種順序保存密鑰，因爲密鑰僅用於訪問元素。您可以使用原始列信息始終打印數據列：

cols = ["column1", "column2", "column3"] 
for row in data_from_database: 
    for col in cols: 
     print row[col]