如何從MongoDB中的數組中獲取數據

Question

我下面有mongoDB收集數據。 我試圖使用typesOfExicution，companyName和projectName來獲取數據。 我寫了以下查詢以查找

db.getCollection('SETTINGS').find({'companyName':'VV', 'typesOfExicution' : 'validation', 'automation.projectName' : 'hdh'})

如果我不使用automation.projectName我可以找到數據。 但是，如果我使用它，那么它將返回0條記錄。

那么從數組中查找數據的確切查詢是什么。

/* 1 */
{
    "_id" : ObjectId("5abce315cabca22270eead6a"),
    "typesOfExicution" : "validation",
    "modesOfExicution" : "auto",
    "automation[0][projectName]" : "Second",
    "automation[0][modules][]" : "Second module",
    "automation[0][assets][]" : "Second assets",
    "companyName" : "VV"
}

/* 2 */
{
    "_id" : ObjectId("5abce31ccabca22270eead6b"),
    "typesOfExicution" : "validation",
    "modesOfExicution" : "auto",
    "automation[0][projectName]" : "Second",
    "automation[0][modules][]" : "Second module",
    "automation[0][assets][]" : "Second assets",
    "companyName" : "VV"
}

/* 3 */
{
    "_id" : ObjectId("5abce321cabca22270eead6c"),
    "typesOfExicution" : "validation",
    "modesOfExicution" : "auto",
    "automation[0][projectName]" : "hdh",
    "automation[0][modules][]" : "ds",
    "automation[0][assets][]" : "djv",
    "companyName" : "VV"
}

Answer 1

這不是您應該在MongoDB中存儲數組的方式。 您應該將數組元素存儲為嵌入式文檔。 正如@Alexis在這里提到的，您的數據庫集合結構到底是什么不清楚，所以我希望這是您給定輸入所期望的：

/* 1 */
{
"_id" : ObjectId("5abce315cabca22270eead6a"),
"typesOfExicution" : "validation",
"modesOfExicution" : "auto",
"automation" : [ 
    {
        "projectName" : "Second",
        "modules" : [ 
            "Second module"
        ],
        "assets" : [ 
            "Second assets"
        ]
    }
],
"companyName" : "VV"
}

/* 2 */
{
"_id" : ObjectId("5abce31ccabca22270eead6b"),
"typesOfExicution" : "validation",
"modesOfExicution" : "auto",
"automation" : [ 
    {
        "projectName" : "Second",
        "modules" : [ 
            "Second module"
        ],
        "assets" : [ 
            "Second assets"
        ]
    }
],
"companyName" : "VV"
}

/* 3 */
{
"_id" : ObjectId("5abce321cabca22270eead6c"),
"typesOfExicution" : "validation",
"modesOfExicution" : "auto",
"automation" : [ 
    {
        "projectName" : "hdh",
        "modules" : [ 
            "ds"
        ],
        "assets" : [ 
            "djv"
        ]
    }
],
"companyName" : "VV"
}

獲得上述數據后，請使用automation.projectName ，您應獲得如下結果：

Answer 2

我不太確定您存儲的文檔的結構。 我相信它看起來像：

   {
      "typesOfExicution": string,
      "modesOfExicution": string,
      "automation": [{ projectName: string, modules: string, assets: string }]
      "companyName" : string
   }

如果要對屬於組成數組automation對象的projectName執行查詢，則需要使用$elemMatch運算符：

   db.getCollection('SETTINGS').find({'companyName':'VV', 'typesOfExicution' : 'validation', 'automation' : { $elemMatch: { 'projectName': 'myProject' } }  })