jmongo's Introduction

jmongo

This library provides clean and powerful mapping between Java POJOs and MongoDB DBObject.

step 1 setting jmongo.properties in resources and class path

db1.servers=192.168.180.49:27000
db1.connectionsPerHost=16
db1.threadsAllowedToBlockForConnectionMultiplier = 10
db1.connectTimeout=60000
db1.maxAutoConnectRetryTime=10
db1.maxWaitTime=120000
db1.socketTimeout=30000
db1.autoConnectRetry=true
db1.socketKeepAlive=true

step 2 define Entity

import java.util.List;
import org.bson.types.ObjectId;
import com.lamfire.jmongo.annotations.Entity;
import com.lamfire.jmongo.annotations.Id;


@Entity
public class User {
	@Id
	private String id;
    private String username;
    private String password;
    private Integer age;

	public String getId() {
		return id;
	}

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

	public String getUsername() {
		return name;
	}

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

	... more set and get method
}

step 3 Using DAO template

User user = new User();
user.setId("10001");
user.setAge(18);
user.setUsername("lamfire");
user.setPassword("password");

DAO<User,String> dao = DAOFactory.get("db1","test",User.class);

//save
dao.save(user);
System.out.println(dao.count());

//get
user = dao.get("10001");

//query
List<User> users = dao.createQuery().asList();

No use configure file

//register mongodb host
MongoOpts opts = new MongoOpts("db1");
opts.addHost("192.168.180.49:27000");
JMongoRegistry.getInstance().register(opts);

//new entity instance
User user = new User();
user.setId("10001");
user.setAge(18);
user.setUsername("lamfire");
user.setPassword("password");

//get dao instance
DAO<User,String> dao = DAOFactory.get("db1","test",User.class);

//save
dao.save(user);
System.out.println(dao.count());

//get
user = dao.get("10001");

//query
List<User> users = dao.createQuery().asList();

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