Home Database MongoDB How to modify data in mongodb

How to modify data in mongodb

Apr 07, 2024 pm 06:18 PM
mongodb

The process of modifying MongoDB data involves using the update() or updateOne() method. The update() method is used to update multiple documents, and its syntax is: db.collection.update(query, update, options). The updateOne() method is used to update a single document, and its syntax is: db.collection.updateOne(query, update, options). In addition to this, MongoDB also provides many other update operators such as $inc, $push, $pull, and $rename.

How to modify data in mongodb

How to modify data in MongoDB

The process of modifying data in MongoDB involves using update( ) method or updateOne() method.

update() method

update() method is used to update multiple documents in a collection. The syntax is:

<code>db.collection.update(query, update, options)</code>
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Among them:

  • query: Query conditions used to select documents to be updated.
  • update: An update is to be applied to the document of the matching document.
  • options: Optional options, such as upsert (create the document if it does not exist) and multi (update all matching documents ).

updateOne() method

updateOne() method is used to update a single document in the collection. The syntax is:

<code>db.collection.updateOne(query, update, options)</code>
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Among them:

  • query: Query conditions used to select documents to be updated.
  • update: An update is to be applied to the document of the matching document.
  • options: Optional options, such as upsert (create the document if it does not exist).

Example

Use the update() method to update multiple documents:

<code>db.users.update(
  { age: { $lt: 30 } },
  { $set: { isYoung: true } }, { multi: true }
);</code>
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This will set the isYoung field to true for all users younger than 30 years old.

Update a single document using the updateOne() method:

<code>db.users.updateOne(
  { name: "John" },
  { $inc: { age: 1 } }
);</code>
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This will increase the age of the user named "John" by 1.

Other update operators

In addition to the $set update operator, MongoDB also provides many other update operators, such as:

  • $inc: Increase the value of a numeric field.
  • $push: Add elements to the array field.
  • $pull: Remove elements from an array field.
  • $rename: Rename the field.

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