Question 115962 in Mongodb Question posted in
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Using the MongoDB runCommand method in java

How to use MongoDB runCommand method in java?
i’m using this db.runCommand( { explain: { update: "info.asset", updates: [ { q: { "version": 3,"providerAssetId":"123" }, u: { $set: { "version": 9 } }, hint: { providerAssetId: 1, version: -1 } }] }, verbosity: "executionStats" }) in mongoDB console, But I want to use this command in Java, can any one suggest me how to use this in Java?

I’m using mongo-java-driver-3.3.0.jar

thank you

example :

DBObject explain = coll.find(condition).sort(order).limit(count).explain();

I can use explain for find method, but I don’t know how to use explain on update method in java

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2

Answers


  1. 0

    As I recall, explain is not supported anymore for most of methods. You can use fully the same RunCommand method in java as in the shell

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  2. 0

    Let’s say you have MongoClient, MongoDatabase and MongoCollection:

    MongoClient client = //here init connection
MongoDatabase db = client.getDatabase("DbNameHere");
MongoCollection collection = db.getCollection("CollectionNameHere");

    you want to execute db.runCommand(...)
    this command should be executed on db level (not on collection), it means you have to call smth like this:

    ...
MongoDatabase db = client.getDatabase("DbNameHere");
Document command = new Document("explain",
            new Document("update", "info.asset")
                .append("updates", List.of(
                        new Document("q", Filters.and(
                            Filters.eq("version", 3),
                            Filters.eq("providerAssetId", "123"))
                        )
                        .append("u", Updates.set("version", 9))
                        .append("hint", new Document("providerAssetId", 1)
                            .append("version", -1)
                        )
                    )
                )
                .append("verbosity", "executionStats")
        );
db.runCommand(command);
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