Question

如果向下滚动一下，您可以在g.d.d.c return SQL table as JSON in python中看到此代码：

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)

我只想保留我的列的顺序。

例如，当我print(cols)时，我得到了这个：

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

但是列的保存顺序错误：

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

我添加的列越多，它就越随机。

Answer 1

Python dict不保存密钥的顺序，而是使用OrderedDict。

Answer 2

如果我理解你想要字典有订购密钥。这是不可能的，因为字典不按某种顺序保存密钥，因为密钥仅用于访问元素。您始终可以使用原始列信息打印数据列：

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

保存时，如何在Python中保留SQL列的顺序？

2 个答案: