![]() Output, a new document is created by combining both query and update object. User userTest5 = mongoOperation.findOne(query, User.class) MongoOperation.upsert(query, update, User.class) Query.addCriteria(Criteria.where("name").is("appleZ")) If document is matched, update it, else create a new document by combining the query and update object, it’s works like findAndModifyElseCreate() □ List usersTest4 = mongoOperation.find(query4, User.class) MongoOperation.updateMulti(query, update, User.class) ![]() mongoOperation.updateFirst(query4, update4, User.class) if use updateFirst, it will update 1004 only. orOperator(Criteria.where("name").is("appleD"), Updates all documents that matches the query. User userTest3_1 = mongoOperation.findOne(query1, User.class) Query1.addCriteria(Criteria.where("name").is("appleC")) MongoOperation.updateFirst(query, update, User.class) User userTest3 = mongoOperation.findOne(query, User.class) Query.addCriteria(Criteria.where("name").is("appleC")) In this case, only the single field “age” is updated. Updates the first document that matches the query. To update a single field / key value, don’t use save(), use updateFirst() or updateMulti() instead. UserTest2_1 - User Īfter the save(), the field ‘age’ is updated correctly, but ic and createdDate are both set to null, the entire “user” object is updated. User userTest2_1 = mongoOperation.findOne(query1, User.class) Query1.addCriteria(Criteria.where("name").is("appleB")) ooppss, you just override everything, it caused ic=null and User userTest2 = mongoOperation.findOne(query, User.class) Query.addCriteria(Criteria.where("name").is("appleB")) The returned “User” object has null value in the fields : age, ic and createdDate, if you modify the ‘age’ field and update it, it will override everything instead of update the modified field – ‘age’. In Query, you get the document returned with a single “name” field value only, it did happened often to save the object returned size. This is a failed example, read carefully, a really common mistake. User userTest1_1 = mongoOperation.findOne(query, User.class) User userTest1 = mongoOperation.findOne(query, User.class) ![]() Query.addCriteria(Criteria.where("name").is("appleA")) "createdDate" : ISODate("T23:17:35.530Z")įind the document, modify and update it with save() method. saveOrUpdate – part 1 exampleĪssume below json data is inserted into MongoDB. P.S All examples are tested under mongo-java-driver-2.11.0.jar and spring-data-mongodb-1.2.0.RELEASE.jar 1. findAndModify – Same with updateMulti, but it has an extra option to return either the old or newly updated document.Upserting – If no document that matches the query, a new document is created by combining the query and update object.updateMulti – Updates all documents that match the query.updateFirst – Updates the first document that matches the query.save – Update the whole object, if “_id” is present, perform an update, else insert it.Here we discuss the definition, How bulk update works in MongoDB? along with examples respectively.In Spring data – MongoDB, you can use following methods to update documents. We can also use the aggregation pipeline after version 4.2 with the bulk update method in MongoDB. We have using initializeOrderedBulkOp () and initializeUnorderedBulkOp () method with the bulk update method. MongoDB bulk update is very useful in MongoDB to update the multiple documents from a collection that match the selection criteria. Var bulk = db.collection_name.initializeOrderedBulkOp () īulk.find ( ) įigure – Example of MongoDB bulk update using multiple field. Hadoop, Data Science, Statistics & othersīelow is the syntax of the MongoDB bulk update.
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