MongoDB Limit and Skip method

MongoDB Limit() method

If you need to read a specified number of data records in MongoDB, you can use MongoDB’s Limit method. The limit() method accepts a Numeric parameter, which specifies the number of records to be read from MongoDB.

Syntax

The basic syntax of the limit() method is as follows:

>db.COLLECTION_NAME.find().limit(NUMBER)

Instance

The data in the collection col is as follows:

{ "_id" : ObjectId("56066542ade2f21f36b0313a"), "title" : "PHP 教程", "description" : "PHP 是一种创建动态交互性站点的强有力的服务器端脚本语言。", "by" : "php中文网", "url" : "http://www.php.cn", "tags" : [ "php" ], "likes" : 200 }
{ "_id" : ObjectId("56066549ade2f21f36b0313b"), "title" : "Java 教程", "description" : "Java 是由Sun Microsystems公司于1995年5月推出的高级程序设计语言。", "by" : "php中文网", "url" : "http://www.php.cn", "tags" : [ "java" ], "likes" : 150 }
{ "_id" : ObjectId("5606654fade2f21f36b0313c"), "title" : "MongoDB 教程", "description" : "MongoDB 是一个 Nosql 数据库", "by" : "php中文网", "url" : "http://www.php.cn", "tags" : [ "mongodb" ], "likes" : 100 }

The above example is to display two records in the query document:

> db.col.find({},{"title":1,_id:0}).limit(2)
{ "title" : "PHP 教程" }
{ "title" : "Java 教程" }
>

Note: If you do not specify the parameters in the limit() method, all data in the collection will be displayed.

MongoDB 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 amount of data. Data, the skip method also accepts a numeric parameter as the number of records to skip.

Syntax

skip() method script syntax format is as follows:

>db.COLLECTION_NAME.find().limit(NUMBER).skip(NUMBER)

Example

The above example will only display the second document data

>db.col.find({},{"title":1,_id:0}).limit(1).skip(1)
{ "title" : "Java 教程" }
>

Note: The default parameter of the skip() method is 0.