Question

我有以下mongoDB集合数据。我正在尝试使用typesOfExicution，companyName和projectName获取数据。我写了下面的查询来查找

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

如果我不使用automation.projectName我能够找到数据。但如果我使用它，那么它将返回0条记录。

那么从数组中查找数据的确切查询是什么。

/* 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

这不是你应该如何在MongoDB中存储数组。您应该将数组元素存储为嵌入文档。正如@Alexis在这里提到的那样，对于你的数据库集合结构究竟是什么并不清楚，所以我希望这是根据你给定的输入预期的结果：

/* 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"
}

按照上述说明获得数据后，请使用automation.projectName，您应该得到如下结果：

Answer 2

我不太确定您的存储文档的结构。我相信它看起来像：

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

如果要对projectName执行查询，该查询属于组成数组automation的对象，则需要使用$elemMatch运算符：

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

如何从mongodb中的数组中获取数据

2 个答案: