Novice MongoDB Learning---(v) MongoDB's limit, skip, sort method

Limit method

If you need to read a specified number of data records in MongoDB, you can use the MongoDB limit method, and the limit () method accepts a numeric parameter that specifies the number of record bars read from MongoDB.

MONGO #进入mongoDB

<span style= "LINE-HEIGHT:16.363636016845703PX;" >use Newsdb #选择NewsDB </span>

Note: If you do not specify a parameter in the limit () method, all data in the collection is displayed.

Skip method

In addition to using the limit () method to read a specified amount of data, we can also use the Skip () method to skip a specified number of data, and the Skip method also accepts a numeric parameter as the number of skipped records.

Db.new.find (). Skip (5). Limit (5) #跳过前5条文档, listing 6-10 clauses

Note:the default parameter for the Skip () method is 0.

Sort method

Using the sort () method to sort data in MongoDB, the sort () method can specify a sorted field by parameter, and use 1 and-one to specify how the sort is sorted, where 1 is in ascending order, and 1 is used in descending order.

Db.new.find ({},{"title": 1,_id:0}). Sort ({"title": -1}) #只显示title属性 and display it in descending order

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Novice MongoDB Learning---(v) MongoDB's limit, skip, sort method