Adding CRUD Capability to Spring MVC

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Adding CRUD Capability to Spring MVC

Paul Sydney Orozco

Dec. 09, 10 · Java Zone ·

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This article is intended for people who are interested in Spring and Hibernate, especially those who are new to the technology. Create, Read, Update and Delete capabilities are essential to a web based application. In this article, I'll be sharing how to add these capabilities to your Spring MVC application. I will be adding the CRUD (Create, Read/Retrieve, Update, Delete) capbility, which will be the operations performed on the database records prior to a certain domain object. We will be using Hibernate as our ORM and our database will be MySQL.

Advanced programmers are also welcome to comment and post suggestions in this article. I accept anything, whether it's positive or negative. :-)

Let us begin!

First, let us create a a Spring configuration resource named “SampleSpringMVC-dao.xml”

<?xml version="1.0" encoding="UTF-8"?>
<!-- Copyright : adobocode.com , 2010 -->
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
                           http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
                           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
       					   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
	<context:annotation-config />
	<context:component-scan base-package="paul.sydney.dataaccess" />
	<tx:annotation-driven />
	<bean
		class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
	<bean id="dataSource"
		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://localhost:3306/my_dummy_db" />
		<property name="username" value="root" />
		<property name="password" value="root" />
	</bean>
	<bean id="entityManagerFactory"
		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
				<property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
				<property name="showSql" value="true" />
			</bean>
		</property>
		<property name="dataSource" ref="dataSource" />
	</bean>
	<bean id="sessionFactoryGrabber" factory-bean="entityManagerFactory"
		factory-method="getSessionFactory" />
	<bean id="personDao" class="paul.sydney.dataaccess.PersonDaoImpl">
		<property name="sessionFactory" ref="sessionFactoryGrabber" />
	</bean>
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactoryGrabber" />
	</bean>
</beans>

Let us then create a “personForm.jsp” (note that the Save and Delete button has the same name and they only differ in value):

<!-- Copyright : adobocode.com , 2010 -->
<%@ page language="java" session="false"
	contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<html>
<head>
<title>Adobocode : Sample Spring MVC using Forms</title>
</head>
<body>
<h2>Adobocode : Person Form</h2>
<form:form modelAttribute="person">
	<form:hidden path="id" />
	<fieldset>
	<table>
		<tr>
			<td>Name</td>
			<td><form:input path="name" /><form:errors path="name" /></td>
		</tr>
		<tr>
			<td>Age</td>
			<td><form:input path="age" /><form:errors path="age" /></td>
		</tr>
		<tr>
			<td>Address</td>
			<td><form:input path="address" /><form:errors path="address" /></td>
		</tr>
		<tr>
			<td></td>
			<td><input type="submit" id="save" name="action" value="Save" />
			<input type="submit" id="delete" name="action" value="Delete" /> <input
				type="submit" name="_eventId_cancel" value="Cancel" /></td>
		</tr>
	</table>
	</fieldset>
</form:form>
</body>
</html>

Now, let us create and annotate our model class Person with JPA:

package paul.sydney.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
/**
 * Copyright : adobocode.com , 2010
 *
 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
 */
@Entity
@Table(name = "person")
public class Person {
	@Id
	@GeneratedValue
	@Column(name = "person_id")
	private int id;
	@Column(name = "person_name")
	private String name;
	@Column(name = "person_age")
	private int age;
	@Column(name = "person_address")
	private String address;
	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 getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
}

Now let us create our DAO layer. First, let us create an interface “PersonDao”

package paul.sydney.dao;
import java.util.List;
import paul.sydney.model.Person;
/**
 * Copyright : adobocode.com , 2010
 *
 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
 */
public interface PersonDao {
	public void savePerson(Person person);
	public void deletePerson(Person person);
	public List retrieveAll();
	public Person retrievePerson(int id);
}

and it's implementing class:

package paul.sydney.dataaccess;
import java.util.List;
import org.hibernate.LockMode;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.stereotype.Repository;
import paul.sydney.dao.PersonDao;
import paul.sydney.model.Person;
/**
 * Copyright : adobocode.com , 2010
 *
 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
 */
@Repository("personDao")
public class PersonDaoImpl extends HibernateDaoSupport implements PersonDao {
	public PersonDaoImpl() {
		super();
	}
	@Override
	public void deletePerson(Person person) {
		getHibernateTemplate().delete(person, LockMode.NONE);
	}
	@Override
	public List retrieveAll() {
		List personList = getHibernateTemplate().loadAll(Person.class);
		return personList;
	}
	@Override
	public Person retrievePerson(int id) {
		return (Person) getHibernateTemplate().get(Person.class, id);
	}
	@Override
	public void savePerson(Person person) {
		getHibernateTemplate().saveOrUpdate(person);
	}
}

and the business modules that relies on those DAO layer:

package paul.sydney.service;
import java.util.List;
import paul.sydney.model.Person;
/**
 * Copyright : adobocode.com , 2010
 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
 */
public interface IDummyService {
	public List getDummyList();
	public Person retrievePerson(int id);
	public void savePerson(Person person);
	public void deletePerson(Person person);
}

and it's implementing class:

package paul.sydney.service;
import paul.sydney.dao.PersonDao;
import paul.sydney.model.Person;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.annotation.Propagation;
/**
 * Copyright : adobocode.com , 2010
 *
 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
 */
@Service("dummyService")
@Transactional(propagation = Propagation.SUPPORTS, readOnly = false)
public class DummyService implements IDummyService {
	@Autowired
	private PersonDao personDao;
	public List getDummyList() {
		return this.personDao.retrieveAll();
	}
	public Person retrievePerson(int id) {
		return this.personDao.retrievePerson(id);
	}
	public void savePerson(Person person) {
		this.personDao.savePerson(person);
	}
	@Override
	public void deletePerson(Person person) {
		this.personDao.deletePerson(person);
	}
}

and finally the Controller which will consume the service/business layer:

package paul.sydney.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.bind.support.SessionStatus;
import paul.sydney.controller.validation.PersonValidator;
import paul.sydney.model.Person;
import paul.sydney.service.IDummyService;
/**
 * PersonForm class, form controller for the 'personForm.jsp'
 *  Copyright : www.adobocode.com , 2010
 *
 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
 *
 */
@Controller
@RequestMapping("/personForm.htm")
@SessionAttributes("person")
public class PersonForm {
	@Autowired
	private IDummyService dummyService;
	private final String SAVE_ACTION = "Save";
	private final String PARAM_ACTION = "action";
	private final String PERSON_ATTRIBUTE = "person";
	private final String PERSON_ID = "personId";
	private final String PERSON_FORM = "personForm";
	private final String PERSON_DISPLAY = "redirect:personDisplay.htm";
	@RequestMapping(method = RequestMethod.GET)
	public Person setupForm(
			@RequestParam(value = PERSON_ID, required = false) Integer id) {
		if (id == null) {
			return new Person();
		} else {
			return this.dummyService.retrievePerson(id);
		}
	}
	@RequestMapping(method = RequestMethod.POST)
	public String save(@ModelAttribute(PERSON_ATTRIBUTE) Person person,
			BindingResult result, SessionStatus status,
			@RequestParam(PARAM_ACTION) String request) {
		if (SAVE_ACTION.equals(request)) {
			new PersonValidator().validate(person, result);
			if (result.hasErrors()) {
				return PERSON_FORM;
			} else {
				this.dummyService.savePerson(person);
				status.setComplete();
				return PERSON_DISPLAY;
			}
		} else {
			this.dummyService.deletePerson(person);
			status.setComplete();
			return PERSON_DISPLAY;
		}
	}
}

These are the things needed in your existing Spring MVC application in order to cater for CRUD capability. Hope you guys learn something.

For the basic Spring MVC Tutorial : Basic Spring Tutorial

For adding validations for Spring Forms : Adding Validations to Spring MVC forms

More stuff can be found at : www.adobocode.com

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