gql 错误：BadQueryError：解析错误：符号处的 ORDER BY 属性无效：3
我收到此错误：
Parse Error: Invalid ORDER BY Property at symbol :3
无法查看导致该错误的原因，如果我删除替换并添加“日期”，它就可以工作。
order = "date"
playlists_data = db.GqlQuery('SELECT * FROM Playlist WHERE
client = :1 AND
category = :2
ORDER BY :3 DESC', client, category, order)
I'm getting this error:
Parse Error: Invalid ORDER BY Property at symbol :3
Can't see what is causing it, if I remove the substitution and add "date" it works.
order = "date"
playlists_data = db.GqlQuery('SELECT * FROM Playlist WHERE
client = :1 AND
category = :2
ORDER BY :3 DESC', client, category, order)
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ORDER BY 不支持绑定参数。
它们只能用在 WHERE 子句中，并且只能替换属性值，不能替换属性名称。
ORDER BY doesn't support bound parameters.
They can only be used in a WHERE clause, and only to replace property values, not property names.