Java MongoDB save multiple documents at once

问题

I Have a list of updated objects/documents i need save all the objects in the list at once.

I saw save() in MongoTemplate but it can take single document at a time. Is there any way to save multiple documents at once or i need to call save in loop ?

回答1:

Thanks for all the help.

I was able to do it using Spring data MongoDB. Spring data MongoDB's MongoRepository has many inbuilt methods.

org.springframework.data.mongodb.repository.MongoRepository.saveAll(Iterable entites) is the one which i used to save multiple documents.

回答2:

This is one way to do.

mongoTemplate.getCollection("your_collection_name").insert(List<Documents>)

You might want to check out BulkWriteOperation class as well.

回答3:

Using Spring you can easily store multiple documents at once.

The Interface is already available with method saveAll and details as under:

@NoRepositoryBean
public interface MongoRepository<T, ID> extends PagingAndSortingRepository<T, ID>, QueryByExampleExecutor<T> {

    /*
     * (non-Javadoc)
     * @see org.springframework.data.repository.CrudRepository#saveAll(java.lang.Iterable)
     */
    @Override
    <S extends T> List<S> saveAll(Iterable<S> entites);
//...
}

Spring usage example:

@Component
public class Processor {

@Autowired
public Processor(Repository repository) {
    this.repository= repository;
}

public void save(Iterable<ProductEntity> entites) {
    List<ProductEntity> saved = repository.saveAll(entites);
    logger.info("Saved {} entities", saved.size());
}

}

your Repository interface:

//https://docs.spring.io/spring-data/mongodb/docs/1.2.0.RELEASE/reference/html/mongo.repositories.html
public interface Repository extends MongoRepository<ProductEntity, String> {   
}

Call save method with 'List' of Product entities

回答4:

For Insert:

You should use the function InsertMany like:

List<Document> docList = new List<Document>();
docList.add(doc1); // assuming that doc1 and doc2 are defined
docList.add(doc2);
yourMongoDb.getCollection("your_collection").insertMany(docList);

For Upsert (what you need):

UpdateOptions options = new UpdateOptions().upsert(true) ;
yourCollectionOfDocuments.forEach( doc ->{ 
    Document filter = Filters.eq("_id", doc.get("id"));
    yourDb.getCollection("your_collection").updateOne(filter,update,option); 
})

来源：https://stackoverflow.com/questions/50718892/java-mongodb-save-multiple-documents-at-once

标签

mongodb

spring-data-mongodb

mongo-java

mongo-java-driver

mongotemplate