将mongo shell查询转换为QueryDBObject并使用spring mongotemplate执行

Question

Below is the query which i am able to execute on my mongo shell properly.

db.students.update({ _id : 139 }, {$pull : { scores: {type :'homework' }}})

I need to execute the same thing using a Java program / Mongo Spring Template. Could somebody help show me how to do this?

Answer 1

Your query might be similar to this:

UpdateResult updateResult = collection.updateOne(eq("_id", 123),
      new Document("$pull", new Document("scores",
          new Document("type", "homework"))
      )
);

Here you've got the documentation of the entire interface and of updateOne in specific.

You also need a connection with the database, so you might want to follow this quick tour to get it done.

EDIT

For doing the same with spring mongo, you can do (as it is documented in the docs ) something like this:

import static org.springframework.data.mongodb.core.query.Criteria.where;
import static org.springframework.data.mongodb.core.query.Query;
import static org.springframework.data.mongodb.core.query.Update;

...

WriteResult wr = mongoTemplate.updateFirst(new Query(where("accounts.accountType").is(Account.Type.SAVINGS)),
  new Update().pull("students.$.scores", new Document("type", "homework")), Account.class);

PS: This answer probably won't work as is, it's just an example, if you want better help give larger snippets of code.