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Cursor In Mongodb

In this article, we will discuss cursor in MongoDB.

What Is A Cursor?

The cursor is an object returned by the find method.

Example

In this example, we have executed the find method.

Picture showing executing the find method in MongoDB

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The method returns 20 records followed by the message – Type "it" for more.

Picture showing the text type it for more once find method is executed

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When you type the word it and press enter, the next 20 records will appear.

Assigning Cursor Object To A Variable

You can assign the cursor to the variable and then further iterate through the variable.

Picture showing assigning the cursor to the variable

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Next And Hasnext Method

The next method is used to retrieve the next document from the result set of a query executed using a cursor.

Picture showing the output of next method in cursor

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The hasNext() function is used to check if there are more documents available in the result set of a cursor before retrieving the next document.

Picture showing the output of hasNext method in cursor

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Loop Through The Cursor

To loop through the cursor, use the following command: -

cursor.forEach(doc=>{printjson(doc)})

Posted By -	Karan Gupta

Posted On -	Tuesday, February 28, 2023

Updated On -	Tuesday, March 26, 2024

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