CosmosDB将结果按值排序到数组中 [英] CosmosDB sort results by a value into an array
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问题描述
我有一些类似以下的CosmosDB文档
I've some CosmosDB documents like the following
{
"ProductId": 1,
"Status": true,
"Code": "123456",
"IsRecall": false,
"ScanLog": [
{
"Location": {
"type": "Point",
"coordinates": [
13.5957758,
42.7111538
]
},
"TimeStamp": 201602160957190600,
"ScanType": 0,
"UserId": "1004"
},
{
"Location": {
"type": "Point",
"coordinates": [
13.5957907,
42.7111359
]
},
"TimeStamp": 201602161246336640,
"ScanType": 0,
"UserId": "1004"
}
]
}
如何通过TimeStamp属性对查询结果进行排序?我尝试使用此查询
How can I order the query results by the TimeStamp property? I've tried using this query
SELECT c.Code, b.TimeStamp FROM c JOIN b IN c.ScanLog ORDER BY b.TimeStamp
但我收到此错误
Order-by over correlated collections is not supported.
正确的方法是什么?
推荐答案
具有ORDER BY的JOIN.
JOINs with ORDER BY are currently not supported.
但是,这是一个可以完成此操作的用户定义函数(UDF):
However, here is a user defined function (UDF) that will do the trick:
function sortScanLog (scanLog) {
function compareTimeStamps(a, b) {
return a.TimeStamp - b.TimeStamp;
}
return scanLog.sort(compareTimeStamps);
}
与这样的查询一起使用:
You use with a query like this:
SELECT c.ProductId, udf.sortScanLog(c.ScanLog) as ScanLog FROM c
如果您想要相反的排序顺序,只需将a和b交换即可.因此,compareTimeStamps内部函数的签名为:
If you want the opposite sort order, simply swap the a and b. So, the signature of the compareTimeStamps inner function would be:
function compareTimeStamps(b, a)
或者,您可以在返回结果后对客户端进行排序.
Alternatively, you can sort client-side after the results are returned.
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