• Java
    • JAXB Tutorial
      • What is JAXB
      • JAXB Marshalling Example
      • JAXB UnMarshalling Example
  • Spring Tutorial
    • Spring Core Tutorial
    • Spring MVC Tutorial
      • Quick Start
        • Flow Diagram
        • Hello World Example
        • Form Handling Example
      • Handler Mapping
        • BeanNameUrlHandlerMapping
        • ControllerClassNameHandlerMapping
        • SimpleUrlHandlerMapping
      • Validation & Exception Handling
        • Validation+Annotations
        • Validation+ResourceBundle
        • @ExceptionHandler
        • @ControllerAdvice
        • Custom Exception Handling
      • Form Tag Library
        • Textbox Example
        • TextArea Example
        • Password Example
        • Dropdown Box Example
        • Checkboxes Example
        • Radiobuttons Example
        • HiddenValue Example
      • Misc
        • Change Config file name
    • Spring Boot Tutorial
  • Hibernate Tutorial
  • REST Tutorial
    • JAX-RS REST @PathParam Example
    • JAX-RS REST @QueryParam Example
    • JAX-RS REST @DefaultValue Example
    • JAX-RS REST @Context Example
    • JAX-RS REST @MatrixParam Example
    • JAX-RS REST @FormParam Example
    • JAX-RS REST @Produces Example
    • JAX-RS REST @Consumes Example
    • JAX-RS REST @Produces both XML and JSON Example
    • JAX-RS REST @Consumes both XML and JSON Example
  • Miscellaneous
    • JSON Parser
      • Read a JSON file
      • Write JSON object to File
      • Read / Write JSON using GSON
      • Java Object to JSON using JAXB
    • CSV Parser
      • Read / Write CSV file
      • Read/Parse/Write CSV File – OpenCSV
      • Export data into a CSV File
      • CsvToBean and BeanToCsv – OpenCSV

JavaInterviewPoint

Java Development Tutorials

Hibernate CRUD Example in Eclipse (XML Mapping) with Maven + Oracle

May 30, 2017 by javainterviewpoint Leave a Comment

In this Hibernate CRUD Example, we will learn how to use Hibernate to perform CRUD operations using XML Mapping. We will be using Oracle database and build an Employee Management System which has the capabilities of Creating a new employee, Getting all the employees, Update the existing employee, Delete an employee.

Creating table

Create EMPLOYEE Table, simply Copy and Paste the following SQL query in the query editor to get the table created.

CREATE TABLE "EMPLOYEE" 
 ( 
    "ID" NUMBER(10) NOT NULL ENABLE, 
    "AGE" NUMBER(10), 
    "DEPT" VARCHAR2(255 CHAR), 
    "NAME" VARCHAR2(255 CHAR), 
     PRIMARY KEY ("ID")
 );

Folder Structure:

Hibernate CRUD Example

  1. Create a simple Maven Project “HibernateTutorial” and create a package for our source files “com.javainterviewpoint” under  src/main/java 
  2. Now add the following dependency in the POM.xml
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0	http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0</modelVersion>
       <groupId>HibernateTutorial</groupId>
       <artifactId>HibernateTutorial</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <properties>
          <hibernate.version>4.3.11.Final</hibernate.version>
          <oracle.connector.version>11.2.0</oracle.connector.version>
       </properties>
    
       <dependencies>
         <!-- Hibernate -->
         <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
         </dependency>
    
         <!-- Oracle -->
         <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc14</artifactId>
            <version>${oracle.connector.version}</version>
         </dependency>
       </dependencies>
       <build>
         <sourceDirectory>src</sourceDirectory>
         <plugins>
           <plugin>
             <artifactId>maven-compiler-plugin</artifactId>
             <version>3.3</version>
             <configuration>
             <source>1.7</source>
             <target>1.7</target>
             </configuration>
           </plugin>
         </plugins>
       </build>d
     </project>
  3. Create the Java classes Employee.java, EmployeeLogic.java and HibernateUtil.java under  com.javainterviewpoint folder.
  4. Place the employee.hbm.xml and hibernate-cfg.xml under the src/main/resources  directory

Other interesting articles which you may like …

  • Hibernate Hello World Example in Eclipse (XML Mapping)
  • Hibernate Hello World Example in Eclipse (Annotation)
  • Hibernate One To One Bidirectional Mapping XML Example with Primary Key
  • Hibernate One To One Mapping XML Example with Foreign Key
  • Hibernate One To Many Mapping XML Example
  • Hibernate Many To Many Mapping Example – XML Mapping
  • Hibernate One To One Bidirectional Mapping – Primary Key(Annotation)
  • Hibernate One To One Bidirectional Mapping Example – Foreign Key(Annotation)
  • Hibernate One To Many Mapping Example Using Annotation
  • Hibernate Many To Many Mapping Example – Annotation
  • Hibernate Inheritance – Table Per Class Hierarchy (XML Mapping & Annotation)
  • Hibernate Inheritance – Table Per Subclass Hierarchy (XML Mapping & Annotation)
  • Hibernate Inheritance – Table Per Concrete Class Hierarchy Example(XML Mapping & Annotation)
  • Hibernate Composite Primary Key Tutorial – Using composite-id tag & Annotations
  • Hibernate Embeddable Composite Primary Key | @Embeddable, @EmbeddedId
  • Component Mapping in Hibernate Using Annotations | @Embeddable & @Embedded
  • Hibernate Component Mapping using XML
  • Difference between session.get() and session.load() in Hibernate

Hibernate CRUD Example

employee.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
 <class name="com.javainterviewpoint.model.Employee" table="EMPLOYEE">
   <id name="id" column="ID">
     <generator class="assigned" />
   </id>
   <property name="name" column="NAME" />
   <property name="age" column="AGE" />
   <property name="dept" column="DEPT" />
 </class>
</hibernate-mapping>
  • The “employee.hbm.xml” tells hibernate to map “Employee” class with the “EMPLOYEE” table in the database.
  • Here ID column act as the primary hence it is marked with the <id>tag.
  • <property> tag maps the property ofEmployee to the corresponding column in EMPOYEE table.

hibernate-cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

 <session-factory>

 <!-- Database connection settings -->
 property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
 <property name="hibernate.connection.username">root</property>
 <property name="hibernate.connection.password">root</property>
 <property name="hibernate.connection.url">jdbc:oracle:thin:@rsh2:40051:mydb</property>

 <!-- JDBC connection pool (use the built-in) -->
 <property name="connection.pool_size">1</property>

 <!-- SQL dialect -->
 <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>

 <!-- Disable the second-level cache -->
 <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

 <!-- Echo all executed SQL to stdout -->
 <property name="show_sql">true</property>

 <!-- Drop and re-create the database schema on startup -->
 <property name="hibernate.hbm2ddl.auto">update</property>

 <!-- Mapping file -->
 <mapping resource="employee.hbm.xml" />
 </session-factory>

</hibernate-configuration>
  • First and foremost property is for specifying the JDBC Driver class, in my case it OracleDriver
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
  • Give the connection URL for connecting the database and provide username and password for connecting the above database
<property name="hibernate.connection.url">jdbc:oracle:thin:@mydb:40051:dev</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
  • Specify the connection pool size, this property limits the number of connections in the Hibernate connection pool.
<property name="connection.pool_size">1</property>
  • Dialect Property makes the Hibernate generate the SQL for the corresponding database which is being used. In this example we are using Oracle database hence Oracle query will be generated. If you are using MySQL database then you need to change the dialect accordingly.
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
  • The show_sql property will print the executed sql in the console when set to true.
<property name="show_sql">true</property>
  • If the property “hibernate.hbm2ddl.auto” is set to “create”  This will drop and recreate the database schema on every execution. If it is set to “update” then the database schema will be updated every time rather than dropping and recreating.
<property name="hibernate.hbm2ddl.auto">update</property>
  • Under the Mapping resource tag, we need to specify all the mapping resources for which we need the table to be created or updated.
<mapping resource="employee.hbm.xml"/>

EmployeeLogic.java

package com.javainterviewpoint;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;

public class EmployeeLogic
{
    public static void main(String[] args)
    {
        EmployeeLogic el = new EmployeeLogic();
        el.createEmployee();
        el.readAllEmployeeDetails();
        el.updateEmployeeById(2, "JIP22");
        el.deleteEmployeeById(2);
    }
    //Save Employee
    public void createEmployee()
    {
        Employee e1 = new Employee();
        e1.setName("JIP1");
        e1.setId(1);
        e1.setAge(111);
        e1.setDept("Java");
        
        Employee e2 = new Employee();
        e2.setName("JIP2");
        e2.setId(2);
        e2.setAge(222);
        e2.setDept("Test");
        
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
        Session session = sessionFactory.openSession();
        
        session.beginTransaction();
        session.save(e1);
        session.save(e2);
        
        session.getTransaction().commit();
        System.out.println("Employees Created!!!");
    }
    //Read all the saved Employees
    @SuppressWarnings("unchecked")
    public void readAllEmployeeDetails()
    {
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
        Session session = sessionFactory.openSession();
        
        session.beginTransaction();
        List<Employee> employeeList = (List) session.createQuery(
                "FROM Employee").list();
        System.out.println("*** Employee Details ***");
        for(Employee employee : employeeList)
        {
            System.out.println("Employee ID   : "+ employee.getId());
            System.out.println("Employee Name : "+ employee.getName());
            System.out.println("Employee Age  : "+ employee.getAge());
        }
        session.getTransaction().commit();
    }
    // Update Employee by Id
    public void updateEmployeeById(int id,String name)
    {
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        
        Employee employee = (Employee)session.get(Employee.class, id);
        employee.setName(name);
        
        session.update(employee);
        session.getTransaction().commit();
        System.out.println("Employee Updated!!!");
    }
    // Delete Employee by Id
    public void deleteEmployeeById(int id)
    {
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        
        Employee employee = (Employee)session.get(Employee.class, id);
        
        session.delete(employee);
        session.getTransaction().commit();
        System.out.println("Employee Deleted!!!");
    }
}

HibernateUtil.java

package com.javainterviewpoint;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil
{
    private static SessionFactory sessionFactory;

    private HibernateUtil()
    {

    }
    public static SessionFactory getSessionFactory()
    {
        Configuration configuration = new Configuration().configure("hibernate.cfg.xml");

        StandardServiceRegistryBuilder srb = new StandardServiceRegistryBuilder();
        srb.applySettings(configuration.getProperties());
        ServiceRegistry serviceRegistry = srb.build();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        return sessionFactory;
    }
}

We have created a separate HibernateUtil class to read the configuration file and return the sessionFactory.

  • Create the Configuration object and read the configuration file using the configure() method.
Configuration configuration = new Configuration().configure("hibernate.cfg.xml");
  • Get the SessionFactory object through the buildSessionFactory() method of the configuration object.
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

Empoyee.java

Our Employee class is a simple POJO consisting of getters and setters for the property id, name, age, dept.

package com.javainterviewpoint;

import java.io.Serializable;

public class Employee implements Serializable 
{
    private static final long serialVersionUID = -889976693182180703L;
    
    private int id;
    private String name;
    private int age;
    private String dept;
    
    public Employee()
    {
        super();
    }

    public Employee(int id, String name, int age, String dept)
    {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.dept = dept;
    }
    
    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 int getAge()
    {
        return age;
    }
    public void setAge(int age)
    {
        this.age = age;
    }
    public String getDept()
    {
        return dept;
    }
    public void setDept(String dept)
    {
        this.dept = dept;
    }
    @Override
    public String toString()
    {
        return "Employee [id=" + id + ", name=" + name + ", age=" + age + ", dept=" + dept + "]";
    }
    @Override
    public int hashCode()
    {
        final int prime = 31;
        int result = 1;
        result = prime * result + age;
        result = prime * result + ((dept == null) ? 0 : dept.hashCode());
        result = prime * result + id;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj)
    {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Employee other = (Employee) obj;
        if (age != other.age)
            return false;
        if (dept == null)
        {
            if (other.dept != null)
                return false;
        } else if (!dept.equals(other.dept))
            return false;
        if (id != other.id)
            return false;
        if (name == null)
        {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }
}

Output :

Hibernate: insert into EMPLOYEE (NAME, AGE, DEPT, ID) values (?, ?, ?, ?)
Hibernate: insert into EMPLOYEE (NAME, AGE, DEPT, ID) values (?, ?, ?, ?)
Employees Created!!!

Hibernate: select employee0_.ID as ID1_0_, employee0_.NAME as NAME2_0_, employee0_.AGE as AGE3_0_, employee0_.DEPT as DEPT4_0_ from EMPLOYEE employee0_
*** Employee Details ***
Employee ID   : 1
Employee Name : JIP1
Employee Age  : 111
Employee ID   : 2
Employee Name : JIP2
Employee Age  : 222

Hibernate: select employee0_.ID as ID1_0_0_, employee0_.NAME as NAME2_0_0_, employee0_.AGE as AGE3_0_0_, employee0_.DEPT as DEPT4_0_0_ from EMPLOYEE employee0_ where employee0_.ID=?
Hibernate: update EMPLOYEE set NAME=?, AGE=?, DEPT=? where ID=?
Employee Updated!!!

Hibernate: select employee0_.ID as ID1_0_0_, employee0_.NAME as NAME2_0_0_, employee0_.AGE as AGE3_0_0_, employee0_.DEPT as DEPT4_0_0_ from EMPLOYEE employee0_ where employee0_.ID=?
Hibernate: delete from EMPLOYEE where ID=?
Employee Deleted!!!

   Download Source Code

Filed Under: Hibernate, Hibernate Tutorial, J2EE, Java Tagged With: Hibernate CRUD Example

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Java Basics

  • JVM Architecture
  • Object in Java
  • Class in Java
  • How to Set Classpath for Java in Windows
  • Components of JDK
  • Decompiling a class file
  • Use of Class.forName in java
  • Use Class.forName in SQL JDBC

Oops Concepts

  • Inheritance in Java
  • Types of Inheritance in Java
  • Single Inheritance in Java
  • Multiple Inheritance in Java
  • Multilevel Inheritance in Java
  • Hierarchical Inheritance in Java
  • Hybrid Inheritance in Java
  • Polymorphism in Java – Method Overloading and Overriding
  • Types of Polymorphism in java
  • Method Overriding in Java
  • Can we Overload static methods in Java
  • Can we Override static methods in Java
  • Java Constructor Overloading
  • Java Method Overloading Example
  • Encapsulation in Java with Example
  • Constructor in Java
  • Constructor in an Interface?
  • Parameterized Constructor in Java
  • Constructor Chaining with example
  • What is the use of a Private Constructors in Java
  • Interface in Java
  • What is Marker Interface
  • Abstract Class in Java

Java Keywords

  • Java this keyword
  • Java super keyword
  • Final Keyword in Java
  • static Keyword in Java
  • Static Import
  • Transient Keyword

Miscellaneous

  • newInstance() method
  • How does Hashmap works internally in Java
  • Java Ternary operator
  • How System.out.println() really work?
  • Autoboxing and Unboxing Examples
  • Serialization and Deserialization in Java with Example
  • Generate SerialVersionUID in Java
  • How to make a class Immutable in Java
  • Differences betwen HashMap and Hashtable
  • Difference between Enumeration and Iterator ?
  • Difference between fail-fast and fail-safe Iterator
  • Difference Between Interface and Abstract Class in Java
  • Difference between equals() and ==
  • Sort Objects in a ArrayList using Java Comparable Interface
  • Sort Objects in a ArrayList using Java Comparator

Follow

  • Coding Utils

Useful Links

  • Spring 4.1.x Documentation
  • Spring 3.2.x Documentation
  • Spring 2.5.x Documentation
  • Java 6 API
  • Java 7 API
  • Java 8 API
  • Java EE 5 Tutorial
  • Java EE 6 Tutorial
  • Java EE 7 Tutorial
  • Maven Repository
  • Hibernate ORM

About JavaInterviewPoint

javainterviewpoint.com is a tech blog dedicated to all Java/J2EE developers and Web Developers. We publish useful tutorials on Java, J2EE and all latest frameworks.

All examples and tutorials posted here are very well tested in our development environment.

Connect with us on Facebook | Privacy Policy | Sitemap

Copyright ©2023 · Java Interview Point - All Rights Are Reserved ·