可以将MongoDB视图与Azure CosmosDB一起使用吗? [英] Is it possible to use MongoDB Views with Azure CosmosDB?

问题描述

我试图通过Robo3T创建一个视图.该命令成功执行，但是无论我如何为视图指定聚合管道，该视图始终为空.示例:

I tried to create a view via Robo3T. The command executes successfully, but the view is always empty, no matter how I specify the aggregation pipeline for the view. Example:

db.createView("testView","originCollection", [{
    $project : {
        _id: 1
    } 
}])

CosmosDB甚至支持MongoDB的视图吗?

Does CosmosDB even support views for MongoDB?

正如Kevin Smith在评论中所问， db.testView.stats()返回:

As Kevin Smith asked in comments db.testView.stats() returns:

{
    "_t" : "CollStatsResponse",
    "ok" : 1,
    "ns" : "myDb.testView",
    "count" : 0.0,
    "size" : 0,
    "avgObjSize" : 0,
    "numExtents" : 0,
    "lastExtentSize" : 0,
    "paddingFactor" : 0,
    "systemFlags" : 0,
    "userFlags" : 0,
    "totalIndexSize" : 0,
    "indexSizes" : {
        "indexSizes" : {}
    }
}

推荐答案

从您提供的详细信息来看，它似乎将视图视为另一个集合，并且在创建视图时没有任何反应(我已经看过与其他命令一起使用，它将继续进行而没有任何错误).

From the details that you have given, it looks like it's treating the view as just another collection and nothing is happening when you create a view (I've seen this with other commands it just continues without any errors).

在视图上调用统计信息时，通常会得到以下结果

When you call stats on a view you'd normally end up with the following

db.testView.stats()
{
    "ok" : 0,
    "errmsg" : "Namespace test.testView is a view, not a collection",
    "code" : 166,
    "codeName" : "CommandNotSupportedOnView"
}

还要查看文档(

Also, looking at the documentation (https://docs.microsoft.com/en-us/azure/cosmos-db/mongodb-feature-support#administration-commands) the Administration Commands don't support createView.

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