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This article shows you the basic operation of MongoDB in SpringBoot. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

The creation of Database Library for the basic Operation of MongoDB in SpringBoot

First, create the database in the MongoDB operation client Robo 3T:

Add user User:

Create a Collections collection (similar to a table in mysql):

Most of the rest of us are based on the Collection "collectiondemo" operation that we created.

Dependency package org.springframework.boot spring-boot-starter-data-mongodb 2.1.7.RELEASE org.springframework.boot spring-boot-starter-web Configure spring. Application.properties file in 2.1.7.RELEASE org.springframework.boot spring-boot-starter-test test 2.1.7.RELEASE SpringBoot. Add, delete, modify and search operations in data.mongodb.host=localhostspring.data.mongodb.port=27017spring.data.mongodb.database=mongodemospring.data.mongodb.username=loginspring.data.mongodb.password=loginMongoDB

Define MongoTemplate

@ Autowired private MongoTemplate mongoTemplate; private static String COLLECTION_DEMO = "collectiondemo"

Based on mongoTemplate operation

Add data @ PostMapping ("/ insertDocument") public void insertDocument (String document) {/ / get collection MongoCollection collection = mongoTemplate.getCollection (COLLECTION_DEMO); Document parse = Document.parse (document); / / insert document collection.insertOne (parse);}

Postman test parameters:

You can query the following in Robo:

Data added successfully, where ObjectId is a 12-byte BSON type string, which is represented by the

Composition

Insert data @ PutMapping ("/ updateDocument") public Long updateDocument (String queryDocument, String ducument) {MongoCollection collection = mongoTemplate.getCollection (COLLECTION_DEMO); BasicDBObject queryParse = BasicDBObject.parse (queryDocument); BasicDBObject parse = BasicDBObject.parse (ducument); UpdateResult result = collection.updateOne (queryParse, new BasicDBObject ("$set", parse)); return result.getModifiedCount () }

Enter parameters:

You can see:

However, there is a problem. When the key in the parameter does not exist in mongodb, it will be created by itself:

There was no age field in mongodb before, but now you can see:

This may be impossible for some business scenarios that have strict requirements on key. In this case, $exists can be used in mongodb:

@ PutMapping ("/ updateDocumentOnlyHave") public Long updateDocumentOnlyHave (String id, String ducument) {MongoCollection collection = mongoTemplate.getCollection (COLLECTION_DEMO); BasicDBObject parse = BasicDBObject.parse (ducument); Set keySet = parse.keySet (); BasicDBObject dbObject = new BasicDBObject (); dbObject.put ("id", id) For (String key: keySet) {dbObject.put (key, new BasicDBObject ("$exists", true));} UpdateResult result = collection.updateOne (dbObject, new BasicDBObject ("$set", parse)); return result.getModifiedCount () } query data @ GetMapping ("/ listDocuments") public List findDocuments () {MongoCollection collection = mongoTemplate.getCollection (COLLECTION_DEMO); FindIterable documents = collection.find (); List listDocuments = new ArrayList (); for (Document document: documents) {listDocuments.add (document) } return listDocuments;} delete data @ DeleteMapping ("/ deleteDocument") public DeleteResult deleteDocument (String name) {MongoCollection collection = mongoTemplate.getCollection (COLLECTION_DEMO); DeleteResult result = collection.deleteOne (new BasicDBObject ("name", name)); return result } the above is the basic operation of MongoDB in SpringBoot. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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