如何根据日期过滤/查找MongoDB中的记录 [英] How to filter/find records in MongoDB based on Date

问题描述

我在MongoDB数据库中有一个集合，该集合包含一些数据，并希望根据日期(忽略时间)过滤和查找数据.

I have a collection in MongoDB database that has some data and would like to filter and find data based on date (ignoring time).

样本数据

{
  "_id" : ObjectId("563a38173c2ab9248c02d89e"),
  "jobId" : "oAEKMcCIJRIAAAFQbrAR6NDd",
  "jobName" : "CheckSessions",
  "jobDesc" : "Checks and deletes expired session data",
  "jobType" : "Job",
  "startTime" : "2015-11-04 00:00:01",
  "endTime" : "2015-11-04 00:00:01",
  "domainName" : "root",
  "recurrencePeriod" : "60",
  "recurrencePeriodDesc" : "HOURS(1)"
}
{
  "_id" : ObjectId("563a38173c2ab9248c02d89f"),
  "jobId" : "C6wKMcCIJXoAAAFQm78R6NCm",
  "jobName" : "CheckSessions",
  "jobDesc" : "Checks and deletes expired session data",
  "jobType" : "Job",
  "startTime" : "2015-11-03 23:00:00",
  "endTime" : "2015-11-03 23:00:01",
  "domainName" : "root",
  "recurrencePeriod" : "60",
  "recurrencePeriodDesc" : "HOURS(1)"
}

我使用以下命令来获取大于特定日期的数据，但没有得到任何结果. startTime和endTime均为EST格式.不知道我在想什么.请指导.

I used the following command to fetch data greater than a specific date but it did not give me any results. Both startTime and endTime are in EST format. Not sure what am I missing. Please guide.

db.jobs.find({"startTime" : { $gt : new Date("2015-11-03")}});

推荐答案

答案:您可以简单地通过字符串比较进行查询.

Answer: You can query simply by string comparison.

首先，确保startTime列上的索引

First, ensure index on startTime column

db.test.ensureIndex({startTime:1})

以下命令使用_id:ObjectId("563a38173c2ab9248c02d89f")

db.test.find({
    startTime: {
        $gte: '2015-11-03 00:00:00',
        $lt:  '2015-11-04 00:00:00'
    }
}).pretty()

通过在查询中运行explain()，我们可以看到索引实际上正在使用中:

By running explain() on our query, we can see the index is in fact in use:

db.test.find({startTime:{$gte:'2015-11-03 00:00:00', $lt:'2015-11-04 00:00:00'}}).explain()

{
    "cursor" : "BtreeCursor startTime_1",
    "isMultiKey" : false,
    "n" : 1,
    "nscannedObjects" : 1,
    "nscanned" : 1,
    "nscannedObjectsAllPlans" : 1,
    "nscannedAllPlans" : 1,
    "scanAndOrder" : false,
    "indexOnly" : false,
    "nYields" : 0,
    "nChunkSkips" : 0,
    "millis" : 0,
    "indexBounds" : {
        "startTime" : [
            [
                "2015-11-03 00:00:00",
                "2015-11-04 00:00:00"
            ]
        ]
    },
    "server" : "Jaans-MBP.home:27017"
}

我的建议仍然是遵循最佳做法，并以正确的日期格式存储您的日期字段，例如

"startTime" : ISODate("2016-05-02T00:00:02Z")

您只需通过MongoDB shell

in MongoDB shell you'd simply pass

> db.test.insert({startTime:new Date()})
> db.test.find()
// results
{ "_id" : ObjectId("563a49d63b1f1b7df0ebc4f5"), "startTime" : ISODate("2015-11-04T18:09:26.613Z") }

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