CODEWITHSUNDEEP
javamongodbmongodb-querymongodb-java
Ohad
Ohad

Reputation: 1651

Creating query in MongoDB Java driver

I have a collection with documents that have the following fields:

I would like to return a cursor to all the documents that meet the following critiria:

Is this query correct?

DBObject query = new BasicDBObject("$gte",99)
    .append("status","complete")
    .append("description", new BasicDBObject("$not", ".*abc")))

DBCursor cursor = collection.find("collection name", query, projection)

Upvotes: 2

Views: 1572

Answers (1)

glytching
glytching

Reputation: 48005

This query:

have status "complete"

and field_num greater than 100

and that their description does not contain "abc" pattern?

... can be expressed as follows:

Bson query =
        // where field_num > 100
        new BasicDBObject("field_num", new BasicDBObject("$gte", 100))

        // where status is ' complete'
        .append("status", new BasicDBObject("$eq", "complete"))

        // where description does not contain 'abc' 
        // note: this uses inverse matching since the $not operator
        // is not allowed with the $regex operator
        .append("description", new BasicDBObject("$regex", "^((?!abc).)*$"));

In versions of the Java driver > 3.0 this can also be expressed more simply as:

Bson query= Filters.and(
        Filters.gt("field_num", 100),
        Filters.eq("status", "complete"),
        Filters.regex("description", "^((?!abc).)*$")
);

The query is executed as follows:

MongoClient mongoClient = ...;

MongoCollection<Document> collection = mongoClient.getDatabase("...")
    .getCollection("...");

collection.find(query)

Upvotes: 2

Related Questions