Presentation on MVC and ORM

7/27/2019 Presentation on MVC and ORM

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PROJECT ON

STUDENTINFORMATION

SYSTEM



A STORY



MVC

• Model- Entity solely concerned with getting the

data, providing the data and being the data itself.

(The role of cook)

• View- Renders the model into a form that is actually

displayable. (The role of decorator)

• Controller- Orchestrates the entire architecture,

passes the necessary details to models and then calls

the right view in order to do the presentation. (The

roll of stickman)



Why MVC

• Controller is separated from Model. (Concept of

multiple cooks)

• View is separated from Model. (Cook doesn’t worry

about the presentation of food)

• View is separated from Controller. (Stickmen

doesn’t worry about the presentation)



MVC Frameworks

• Different MVC frameworks have different

implementations of these concepts.

• They provide prebuilt classes.

• They are extensible.



Popular Java MVC frameworks

• Struts

• Struts 2

• Springs MVC

• Play

• JSF

• Wicket

• Many More



Pattern vs. Framework

• Pattern is a set of guidelines

on how to architect the

application

• When we implement a

pattern we need to havesome classes and libraries

• Thus, pattern is the way

you can architect your

application.

• Framework helps us to

follow a particular pattern

when we are building a web

application

• These prebuilt classes andlibraries are provided by the

MVC framework.

• Framework provides

foundation classes andlibraries.



Advantages of Frameworks

• Gets us started really quickly- If we are developing a

number of web applications on a similar pattern, then instead

of rewriting the same classes again and again, we have a set

of classes and libraries that make our work easier.

• Leverages industries best practices- If we use MVC

framework, it proves to be really helpful, because the way the

framework has been designed, it consumes a lot of real worldexperience.



JSPs

BUSINESS LOGIC

SERVLETS



STRUTS 2 DISPATCHER: web.xml

• Verifies the request URI and determine which action to

invoke.

• Two types of dispatchers are used

– Filter Dispatcher (org.apache.struts2.dispatcher.FilterDispatcher)



STRUTS 2 DISPATCHER: web.xml

– StrutsPrepareAndExecuteFilter (org.apache.struts2.dispatcher.ng.filter

.StrutsPrepareAndExecuteFilter)



STRUTS 2 MODEL and VIEW




admin



STRUTS 2 CONTROLLERS- struts.xml



ABOUT STRUTS 2

• It’s an MVC framework

•Version 2

• Gives us prebuilt classes for MVC that we can

use / extend



HIBERNATE: AN APPROACH OF

ORM



JDBC

•Standard Java API for database-independent connectivity betweenthe Java programming language and a wide range of databases.

• JDBC provides a flexible architecture to write a database

independent applications that can run on different platforms and

interact with different DBMS without any modification.

• JDBC includes APIs for each of the task commonly associated with

database usage:

– Making a connection to a database.

– Creating SQL statements.

– Executing SQL queries in the database.

– Viewing & modifying the resulting records.



JDBC

Pros of JDBC

• Clean and simple SQL

processing

•

Good performance withsmall data

• Very good for small

applications

•

Simple syntax so easy tolearn

Cons of JDBC

• Complex if it is used in large

projects

•

Large programmingoverhead

• No encapsulation

• Hard to implement MVC

concept• Query is DBMS specific



HIBERNATE

• An ORM tool

• Used in the data layer of application, for

persisting application data into database

• Implements JPA

– This means that it follows a set of standards for

implementing persistence, so that in future if we want to

change from Hibernate, we can easily do it without anyperformance issues.



The Problem



The Problem

• Mapping member variables to columns

• Mapping Relationships

• Handling data types (esp. Boolean)

• Managing changes to object state



The Problem

Object

Relational

Mapping!



ORM

• Converts data between relational databases and

object oriented programming languages

• Advantages over JDBC

–Lets business code access objects rather than DB tables

– Hides details of SQL queries from OO logic

– Based on JDBC ‘under the hood’

– No need to deal with database implementation

– Transaction Management and automatic key generation

– Fast development of applications



JAVA ORM Frameworks

• Enterprise JavaBeans Entity Beans

• Java Data Objects

• Castor

• TopLink

• Springs DAO

•

Hibernate• Many More



Saving without Hibernate

• JDBC Database Configuration

• The Model Object

• Service method to create the model object

• Database Design

• DAO method to save the object using SQL

queries



The Hibernate Way

• JDBC Database Configuration – Hibernate

Configuration

• The Model object – Annotations

• Service method to create the model object –

Use the Hibernate API

• Database Design – Not Needed !

• DAO method to save the objects using SQL

queries – Not Needed !



Supported Databases

• HSQL

• DB2

• MySQL

• PostgreSQL

• FrontBase

• Oracle

• H2• Sybase and many more



Supported Technologies

• Xdoclet Spring

• J2EE

• Eclipse plug-ins

• Maven

Hibernate Architecture



Hibernate Architecture



HIBERNATE CONFIGURATION

• Refers to the hibernate configuration file that is

hibernate.cfg.xml

• This file is read first by the hibernate framework and the data

flow is done accordingly

• Consists of properties and mapping resource

• Mapping resource can consist of a xml file or a POJO class

with annotations

• Consists of properties such as connection url, driver class,

username, password, dialect and hbm2ddl.auto



HIBERNATE show sql



HIBERNATE show_sql



Hibernate Mapping Resource



Hibernate Table Creation



Features of Hibernate

• Implementation of JPA

• ORM tool

• Has data caching abilities

• Provides an entire different SQL implementation known as

HQL, which is the basis of NoSQL databases

• Can persist the following relations in database, using

annotations as well as xml files.

– One to One

– One to Many

– Many to One

– Many to many



PROJECT MODULE:CONTACT MANAGER

HOME PAGE



HOME PAGE

Deleting a Record



Deleting a Record

Deleting a Record



Deleting a Record



PROJECT SUMMARY

HARDWARE SPECIFICATION SOFTWARE VERSION

MEMORY 10 GB IDE MyEclipse 8.0

RAM 128 MB Server Apache Tomcat 6.x

PROCESSOR 1.6 GHz Front End Struts 2.1.5

OS WINDOWS 8 Back End Hibernate 4 +

Oracle 10G XE



Trainee At

• ROAD AHEAD TECHNOLOGIES, JAIPUR

• Mentor: Mr. Abhishek Jain



THANK YOU

Presentation on MVC and ORM

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