Hibernate Annotations - OnetoOne Mapping

-

Hibernate Annotations JPA 1

 

One to One Mapping

 

Class Employee.java

package com.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;

@Entity
@Table(name = "employeeaddress")
public class EmployeeAddress implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    // Fields

    private Integer employeeid;

    private String address;

    private Employee employee;

    // Constructors

    /** default constructor */
    public EmployeeAddress() {
    }

    /** minimal constructor */
    public EmployeeAddress(Integer employeeid) {
        this.employeeid = employeeid;
    }

    /** full constructor */
    public EmployeeAddress(Integer employeeid, String address) {
        this.employeeid = employeeid;
        this.address = address;
    }

    // Property accessors
    @Id
    @Column(name = "EMPLOYEEID", unique = true, nullable = false, insertable = true, updatable = true)
    public Integer getEmployeeid() {
        return this.employeeid;
    }

   
    public void setEmployeeid(Integer employeeid) {
        this.employeeid = employeeid;
    }

    @Column(name = "ADDRESS", unique = false, nullable = true, insertable = true, updatable = true, length = 45)
    public String getAddress() {
        return this.address;
    }

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

    @OneToOne
    @PrimaryKeyJoinColumn
    public Employee getEmployee() {
        return employee;
    }

    public void setEmployee(Employee employee) {
        this.employee = employee;
    }
}

Class EmployeeAddress.java


package com.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;

@Entity
@Table(name = "employeeaddress")
public class EmployeeAddress implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    // Fields

    private Integer employeeid;

    private String address;

    private Employee employee;

    // Constructors

    /** default constructor */
    public EmployeeAddress() {
    }

    /** minimal constructor */
    public EmployeeAddress(Integer employeeid) {
        this.employeeid = employeeid;
    }

    /** full constructor */
    public EmployeeAddress(Integer employeeid, String address) {
        this.employeeid = employeeid;
        this.address = address;
    }

    // Property accessors
    @Id
    @Column(name = "EMPLOYEEID", unique = true, nullable = false, insertable = true, updatable = true)
    public Integer getEmployeeid() {
        return this.employeeid;
    }

   
    public void setEmployeeid(Integer employeeid) {
        this.employeeid = employeeid;
    }

    @Column(name = "ADDRESS", unique = false, nullable = true, insertable = true, updatable = true, length = 45)
    public String getAddress() {
        return this.address;
    }

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

    @OneToOne
    @PrimaryKeyJoinColumn
    public Employee getEmployee() {
        return employee;
    }

    public void setEmployee(Employee employee) {
        this.employee = employee;
    }

}

Test method to save the Employee object

public void test() {
      
        Employee e = new Employee();
        e.setEmployeeid(new Random().nextInt(10000));
        e.setName("MyName");
        EmployeeAddress ed = new EmployeeAddress(); 
        ed.setEmployeeid(e.getEmployeeid());
       
        ed.setAddress("MyCity");
        ed.setEmployee(e);
        e.setEmployeeaddress(ed);

        // Create session with AnnotationConfiguration
        Session session = null;
        try {
            SessionFactory sf =  new AnnotationConfiguration().configure().buildSessionFactory();
            session = sf.openSession();
            session.beginTransaction();
            session.save(e);
            session.getTransaction().commit();
        } catch (HibernateException ex) {
            ex.printStackTrace();
        }finally{
            if(session != null) session.close();
        }
      
    }

Comments

Post a Comment

Popular posts from this blog

Log4j multiple WAR files in single EAR configuration

-
Log4j multiple WAR files in single EAR configuration Problem: When you have multiple WAR files under the same EAR with multiple log4j config files in each of the war files, the logging API will pickup the first available config file and ignores the list. i.e, only a single log4j config file applies to entire EAR. Consider the below app app.ear |__admin.war    |__WEB-INF/classes/log4.xml |__web.war    |__WEB-INF/classes/log4j.xml When you deploy this app to the server all logs of two war files admin.war and web.war will go to admin.war' log. The log4j.xml in web.war has no effect here. There are some complex solutions for this like adding a logback, specifying package level log files in log4j configuration etc. Solution The easiest way is configuring the context param in web.xml In your web.xml add the following context param will send the log4j config locations specific to the contexts and fixes this issue. web.war/WEB-INF/classes/log4j...
More posts »

Java NIO2 - Watching a directory for changes. FileWatcherService.

-
Image
File Watch Service The NIO2 WatchService API provides the ability for java code to watch for file modifications in a directory in the filesystem. A WatchService object watches the folder it is registered with and signals the changes detected through event notifications.  Steps to create a WatchService Create a WatchService object (FileSystem.newWatchService()) Register the directories to be watched with the WatchService (WatchService.register()) Watch for file change events (poll()/take() methods) Retrieve the event keys and process them Rest the key and got to step 3 to watch again. Example code Below is a simple working code. import java.io.IOException; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.StandardWatchEventKinds; import java.nio.file.WatchEvent; import java.nio.file.WatchKey; import java.nio.file.WatchService; import java.util.List; import java.util.concurrent.TimeUnit; public class FileWatcherTest { private sta...
More posts »

Ubuntu / kubuntu - Laptop key board cursor jumping issue

-
Image
Ubuntu cursor jumping problem Issue : When you type in Ubuntu/Kubuntu you may get annoyed by cursor jumping here and there in the screen. This happens across all the applications. You might have tried adjusting key board settings, key stroke speed etc. But this is not related to your key board, but the touch pad! Cause: The cause of this issue is your touch pad. Yes, while typing parts of your hand/fingers often touch the keyboard. In windows this touch will not be deducted while typing. But for Ubuntu it is.  So when you type something and un-intentionally unknowingly touch your touch pad will take your cursor to the appropriate mouse position with respect to your touch forgetting you are typing something!!! Solution: Simple. Say your touch pad not to care the touches while I am eagerly typing something important.. How to say that? Open Synaptix Touch pad manager  Check Automatically switch of touch pad on keyboard activity Time to wait before switc...
More posts »