从MongoDB文档中获取值

时间:2016-10-26 15:19:12

标签: php mongodb

我有一个文件如下的集合(MongoDB):

{
    _id: 'ABPS1001',
    Brand: 'DecNag',
    serial: '2393-829-109',
    resume: [
        {
            status: '1',
            nameAg: 'Gina',
            lastNameAg: 'Saenz',
            coord_id: '1025',
            movDate: '25-10-2016 11:33'
        },
        {
            status: '0',
            techID: '11',
            coord_id: '1025',
            movDate: '30-10-2016 16:29',
            idReplace: 'ABPS1026'
        },
        {
            status: '1',
            nameAg: 'Diana',
            lastNameAg: 'Gutierrez',
            coord_id: '1014',
            techID: '10',
            movDate: '04-11-2016 09:12'
        },
        {
            status: '0',
            techID: '12',
            coord_id: '1014',
            movDate: '30-11-2016 16:25',
            idReplace: 'ABPS1021'
        },
        {
            status: '1',
            nameAg: 'Laura',
            lastNameAg: 'Diaz',
            coord_id: '1012',
            techID: '11',
            movDate: '04-12-2016 11:33'
        },
        {
            status: '0',
            techID: '10',
            coord_id: '1012',
            movDate: '22-12-2016 12:21',
            idReplace: 'ABPS1107'
        },
        {
            status: '1',
            nameAg: '172.27.48.125',
            lastNameAg: '',
            coord_id: '1004',
            techID: '12',
            movDate: '27-12-2016 08:30'
        },
        {
            status: '0',
            techID: '11',
            movDate: '02-02-2017 14:12',
            idReplace: 'ABPS1107'
        }
     ]
 }

我需要从文档“resume”获取最后一个条目,其中_id:'ABPS1001'代替整个文档。有没有办法使用MongoDB语句而不是使用编程语言进行处理?

另外,如何在“resume”上为任何一组值添加或删除值(例如,如果我想在“resume”的最后一组中添加“coord_id”)?

谢谢!

1 个答案:

答案 0 :(得分:1)

以下是如何使用聚合来完成问题的第一部分:

// Returns last value of the resume array...
// First - Match the document
// Second - Project to slice the last element of the resume array and put it into a new document called lastValue
db.foo.aggregate([
    { $match: {"_id": "ABPS1001"} }, 
    { $project: { lastValue: { $slice: [ "$resume", -1 ] } } }
])

结果:

{
    "_id" : "ABPS1001",
    "lastValue" : [
        {
            "status" : "0",
            "techID" : "11",
            "movDate" : "02-02-2017 14:12",
            "idReplace" : "ABPS1107"
        }
    ]
}

对于第二部分,您可以使用' $'进行位置更新。运算符see here