QuickStart - POJO

Code

mkdir -p src/main/java/com/admatic/model

cat << EOF > src/main/java/com/admatic/model/Address.java
package com.admatic.model;

public final class Address {

    private String street;
    private String city;
    private String zip;

    public Address() {
    }

    public Address(final String street, final String city, final String zip) {
        this.street = street;
        this.city = city;
        this.zip = zip;
    }

    public String getStreet() {
        return street;
    }

    public void setStreet(final String street) {
        this.street = street;
    }

    public String getCity() {
        return city;
    }

    public void setCity(final String city) {
        this.city = city;
    }

    public String getZip() {
        return zip;
    }

    public void setZip(final String zip) {
        this.zip = zip;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Address address = (Address) o;

        if (getStreet() != null ? !getStreet().equals(address.getStreet()) : address.getStreet() != null) {
            return false;
        }
        if (getCity() != null ? !getCity().equals(address.getCity()) : address.getCity() != null) {
            return false;
        }
        if (getZip() != null ? !getZip().equals(address.getZip()) : address.getZip() != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result = getStreet() != null ? getStreet().hashCode() : 0;
        result = 31 * result + (getCity() != null ? getCity().hashCode() : 0);
        result = 31 * result + (getZip() != null ? getZip().hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return "Address{"
                + "street='" + street + "'"
                + ", city='" + city + "'"
                + ", zip='" + zip + "'"
                + "}";
    }
}
EOF

cat << EOF > src/main/java/com/admatic/model/Person.java
package com.admatic.model;

import org.bson.types.ObjectId;

public final class Person {
    private ObjectId id;
    private String name;
    private int age;
    private Address address;

    public Person() {
    }

    public Person(final String name, final int age, final Address address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public ObjectId getId() {
        return id;
    }

    public void setId(final ObjectId id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(final int age) {
        this.age = age;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(final Address address) {
        this.address = address;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Person person = (Person) o;

        if (getAge() != person.getAge()) {
            return false;
        }
        if (getId() != null ? !getId().equals(person.getId()) : person.getId() != null) {
            return false;
        }
        if (getName() != null ? !getName().equals(person.getName()) : person.getName() != null) {
            return false;
        }
        if (getAddress() != null ? !getAddress().equals(person.getAddress()) : person.getAddress() != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result = getId() != null ? getId().hashCode() : 0;
        result = 31 * result + (getName() != null ? getName().hashCode() : 0);
        result = 31 * result + getAge();
        result = 31 * result + (getAddress() != null ? getAddress().hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return "Person{"
                + "id='" + id + "'"
                + ", name='" + name + "'"
                + ", age=" + age
                + ", address=" + address
                + "}";
    }
}
EOF

vim src/main/java/com/admatic/PojoQuickTour.java

package com.admatic;

import com.admatic.model.Address;
import com.admatic.model.Person;
import com.mongodb.Block;
import com.mongodb.MongoClientSettings;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.codecs.pojo.PojoCodecProvider;

import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import static com.mongodb.client.model.Filters.*;
import static com.mongodb.client.model.Updates.combine;
import static com.mongodb.client.model.Updates.set;
import static java.util.Arrays.asList;
import static org.bson.codecs.configuration.CodecRegistries.fromProviders;
import static org.bson.codecs.configuration.CodecRegistries.fromRegistries;

public class PojoQuickTour {

    /**
     * Run this main method to see the output of this quick example.
     *
     * @param args takes an optional single argument for the connection string
     */
    public static void main(final String[] args) {
        Logger mongoLogger = Logger.getLogger("org.mongodb.driver");
        mongoLogger.setLevel(Level.SEVERE);

        MongoClient mongoClient;

        if (args.length == 0) {
            // connect to the local database server
            mongoClient = MongoClients.create();
        } else {
            mongoClient = MongoClients.create(args[0]);
        }

        // create codec registry for POJOs
        CodecRegistry pojoCodecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(),
                fromProviders(PojoCodecProvider.builder().automatic(true).build()));

        // get handle to "admatic-db" database
        MongoDatabase database = mongoClient.getDatabase("admatic-db").withCodecRegistry(pojoCodecRegistry);

        // get a handle to the "people" collection
        MongoCollection<Person> collection = database.getCollection("people", Person.class);

        // drop all the data in it
        collection.drop();

        // make a document and insert it
        Person ada = new Person("Ada Byron", 20, new Address("St James Square", "London", "W1"));
        System.out.println("Original Person Model: " + ada);
        collection.insertOne(ada);

        // Person will now have an ObjectId
        System.out.println("Mutated Person Model: " + ada);

        // get it (since it's the only one in there since we dropped the rest earlier on)
        Person somebody = collection.find().first();
        System.out.println(somebody);

        // now, lets add some more people so we can explore queries and cursors
        List<Person> people = asList(
                new Person("Charles Babbage", 45, new Address("5 Devonshire Street", "London", "W11")),
                new Person("Alan Turing", 28, new Address("Bletchley Hall", "Bletchley Park", "MK12")),
                new Person("Timothy Berners-Lee", 61, new Address("Colehill", "Wimborne", null))
        );

        collection.insertMany(people);
        System.out.println("total # of people " + collection.countDocuments());

        System.out.println("");
        // lets get all the documents in the collection and print them out
        Block<Person> printBlock = new Block<Person>() {
            @Override
            public void apply(final Person person) {
                System.out.println(person);
            }
        };

        collection.find().forEach(printBlock);

        System.out.println("");
        // now use a query to get 1 document out
        somebody = collection.find(eq("address.city", "Wimborne")).first();
        System.out.println(somebody);

        System.out.println("");
        // now lets find every over 30
        collection.find(gt("age", 30)).forEach(printBlock);

        System.out.println("");
        // Update One
        collection.updateOne(eq("name", "Ada Byron"), combine(set("age", 23), set("name", "Ada Lovelace")));

        System.out.println("");
        // Update Many
        UpdateResult updateResult = collection.updateMany(not(eq("zip", null)), set("zip", null));
        System.out.println(updateResult.getModifiedCount());

        System.out.println("");
        // Replace One
        updateResult = collection.replaceOne(eq("name", "Ada Lovelace"), ada);
        System.out.println(updateResult.getModifiedCount());

        // Delete One
        collection.deleteOne(eq("address.city", "Wimborne"));

        // Delete Many
        DeleteResult deleteResult = collection.deleteMany(eq("address.city", "London"));
        System.out.println(deleteResult.getDeletedCount());

        // Clean up
        database.drop();

        // release resources
        mongoClient.close();
    }
}

Run

mvn compile

mvn exec:java -Dexec.mainClass=com.admatic.PojoQuickTour \
    -Dexec.args="mongodb+srv://admatic:admatic123@admatic-cluster-7qyyr.mongodb.net/test"

Original Person Model: Person{id='null', name='Ada Byron', age=20, address=Address{street='St James Square', city='London', zip='W1'}}
Mutated Person Model: Person{id='5c740a2b8fa66c359edd4e63', name='Ada Byron', age=20, address=Address{street='St James Square', city='London', zip='W1'}}
Person{id='5c740a2b8fa66c359edd4e63', name='Ada Byron', age=20, address=Address{street='St James Square', city='London', zip='W1'}}
total # of people 4

Person{id='5c740a2b8fa66c359edd4e63', name='Ada Byron', age=20, address=Address{street='St James Square', city='London', zip='W1'}}
Person{id='5c740a2b8fa66c359edd4e64', name='Charles Babbage', age=45, address=Address{street='5 Devonshire Street', city='London', zip='W11'}}
Person{id='5c740a2b8fa66c359edd4e65', name='Alan Turing', age=28, address=Address{street='Bletchley Hall', city='Bletchley Park', zip='MK12'}}
Person{id='5c740a2b8fa66c359edd4e66', name='Timothy Berners-Lee', age=61, address=Address{street='Colehill', city='Wimborne', zip='null'}}

Person{id='5c740a2b8fa66c359edd4e66', name='Timothy Berners-Lee', age=61, address=Address{street='Colehill', city='Wimborne', zip='null'}}

Person{id='5c740a2b8fa66c359edd4e64', name='Charles Babbage', age=45, address=Address{street='5 Devonshire Street', city='London', zip='W11'}}
Person{id='5c740a2b8fa66c359edd4e66', name='Timothy Berners-Lee', age=61, address=Address{street='Colehill', city='Wimborne', zip='null'}}


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