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Example of @MapKeyTemporal in Hibernate

By Arvind Rai, May 26, 2013
In hibernate @MapKeyTemporal is used when map key is date. Date is mapped while inserting data in the table and while fetching the same, date will be key for the map. In hibernate @MapKeyTemporal is used as
 @MapKeyTemporal(TemporalType.TIMESTAMP)
 


Country.java
 package com.concretepage.persistence;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Map;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.MapKeyTemporal;
import javax.persistence.OneToMany;
import javax.persistence.TemporalType;

@Entity
public class Country implements Serializable {
	private static final long serialVersionUID = 1L;
	@Id
	@Column(name="id")
	private int id;
	
	@Column(name="name")
	private String name;
	
	@OneToMany(cascade=CascadeType.ALL)	
	@JoinColumn(name="country_id")
	@MapKeyTemporal(TemporalType.TIMESTAMP)
	private Map<Calendar,State> states;
	
	public Country(int id,String name,Map<Calendar,State> states){
		this.id=id;
		this.name=name;
		this.states=states;
	}
	public Country(){
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Map<Calendar,State> getStates() {
		return states;
	}
	public void setStates(Map<Calendar,State> states) {
		this.states = states;
	}
}
 





State.java
package com.concretepage.persistence;
import java.io.Serializable;
import java.util.Calendar;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.MapKeyTemporal;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name = "state")
public class State  implements Serializable{
	private static final long serialVersionUID = 1L;

	@Id
	@Column(name = "id")
	private int id;

	@Id
	@Column(name = "country_id")
	private int countryId;
			
	@Column(name = "name") 
	private String name;
	
	@Temporal(TemporalType.TIMESTAMP)
	@Column(name="create_date")
	private Calendar createDate;
	
	public State(int id,int countryId,String name,Calendar createDate){
		this.id=id;
		this.countryId=countryId;
		this.name= name;
		this.createDate=createDate;
	}
	public State(){}
	
	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}
	public int getCountryId() {
		return countryId;
	}
	public void setCountryId(int countryId) {
		this.countryId = countryId;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}
 


HibernateUtil.java
package com.concretepage.util;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import com.concretepage.persistence.Country;
import com.concretepage.persistence.State;
public class HibernateUtil {
	private static final SessionFactory concreteSessionFactory;
		static {
		 try {
				Properties prop= new Properties();
				prop.setProperty("hibernate.connection.url", "jdbc:mysql://localhost:3306/hibernate");
				prop.setProperty("hibernate.connection.username", "root");
				prop.setProperty("hibernate.connection.password", "");
				prop.setProperty("hibernate.hbm2ddl.auto", "update");
				prop.setProperty("dialect", "org.hibernate.dialect.MySQLDialect");
				
				concreteSessionFactory = new AnnotationConfiguration()
			   .addPackage("com.concretepage.persistence")
					   .addProperties(prop)
					   .addAnnotatedClass(Country.class)
					   .addAnnotatedClass(State.class)
					   .buildSessionFactory();
		  } catch (Throwable ex) {
			throw new ExceptionInInitializerError(ex);
		  }
		}
		public static Session getSession()
				throws HibernateException {
			return concreteSessionFactory.openSession();
		}
		
		public static void main(String... args){
			Session session=getSession();
	    	session.beginTransaction();
	    	
	    	Calendar calendar = Calendar.getInstance();
	    	Map<Calendar, State> map= new HashMap<Calendar,State>();
	    	calendar.add(Calendar.YEAR,-50);
	    	State s1= new State(1,1,"UP",calendar);
	    	map.put(calendar, s1);
	    	
	    	calendar.add(Calendar.DAY_OF_MONTH,-10);
	    	State s2= new State(2,1,"MP",calendar);
	    	map.put(calendar, s2);
	    	
	    	calendar.add(Calendar.DAY_OF_MONTH,-10);
	    	State s3= new State(3,1,"HP",calendar);
	    	map.put(calendar, s3);
	    		    		    
	    	Country c= new Country(1, "India", map);
	    	
	    	session.persist(c);
	    	session.getTransaction().commit();
	    	
	    	Country cval=(Country)session.get(Country.class, new Integer(1));
	    	Map<Calendar,State> states = cval.getStates();
	    	Iterator entries = states.entrySet().iterator();
	    	while (entries.hasNext()) {
	    	    Map.Entry entry = (Map.Entry) entries.next();
	    	    Calendar key = (Calendar)entry.getKey();
	    	    State value = (State)entry.getValue();
	    	    System.out.println("Key = " + key.getTimeInMillis() + ", Value = " + value.getName());
	    	}
	    	
	    	session.close();
	   }
	}
 
POSTED BY
ARVIND RAI
ARVIND RAI
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