MVC + ORM (with project implementation)
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Transcript of MVC + ORM (with project implementation)
PROJECT ON
STUDENT INFORMATION
SYSTEMSubmitted by:Prateek Chauhan
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 have some 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 and libraries are provided by the MVC framework.
• Framework provides foundation classes and libraries.
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 world experience.
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
STRUTS 2 MODEL and VIEW
admin
STRUTS 2 MODEL and VIEW
STRUTS 2 MODEL and VIEW
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 between
the 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 with
small data• Very good for small
applications• Simple syntax so easy to
learn
Cons of JDBC• Complex if it is used in large
projects• Large programming
overhead• 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 any performance 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 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 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
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