hibernate ppt presentation free download

Mar 22, 2019

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Hibernate. Dasan Weerarathne. Introduction. Hibernate allows to persist the java objects using its’ Object/Relational Mapping (ORM) framework. It is automates ORM and considerably reduces the number of lines of code needed to persist the object in the database.

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Hibernate DasanWeerarathne

Introduction • Hibernate allows to persist the java objects using its’ Object/Relational Mapping (ORM) framework. • It is automates ORM and considerably reduces the number of lines of code needed to persist the object in the database. • Hibernate can be used in Java Swing applications, Java Servlet-based applications, or J2EE applications using EJB session beans.

Advantages of Using Hibernate • Relational Persistence for JAVA • Working with both Object-Oriented software and Relational Database is complicated task with JDBC because there is mismatch between how data is represented in objects versus relational database. • JDBC, developer has to write code to map an object model's data representation to a relational data model and its corresponding database schema • Hibernate is flexible and powerful ORM solution to map Java classes to database tables. • Hibernate itself takes care of this mapping using XML files so developer does not need to write code for this.

Advantages of Using Hibernate • Transparent Persistence • The automatic mapping of Java objects with database tables. • Hibernate provides transparent persistence and developer does not need to write code explicitly to map database tables tuples to application objects during interaction with RDBMS. (With JDBC this conversion is to be taken care of by the developer manually with lines of code. )

Advantages of Using Hibernate • Support for Query Language • JDBC supports only native Structured Query Language (SQL). Developer has to find out the efficient way to access database. • Hibernate provides a powerful query language Hibernate Query Language (independent from type of database) that is expressed in a familiar SQL like syntax and includes full support for polymorphic queries. • Hibernate also selects an effective way to perform a database manipulation task for an application.

Advantages of Using Hibernate • Database Dependent Code • Application using JDBC to handle persistent data (database tables) having database specific code in large amount. The code written to map table data to application objects and vice versa is actually to map table fields to object properties. As table changed or database changed then it’s essential to change object structure as well as to change code written to map table-to-object/object-to-table. • Hibernate provides this mapping itself. The actual mapping between tables and application objects is done in XML files. If there is change in Database or in any table then the only need to change XML file properties.

Advantages of Using Hibernate • Maintenance Cost • With JDBC, it is developer’s responsibility to handle JDBC result set and convert it to Java objects through code to use this persistent data in application. So with JDBC, mapping between Java objects and database tables is done manually. • Hibernate reduces lines of code by maintaining object-table mapping itself and returns result to application in form of Java objects. It relieves programmer from manual handling of persistent data, hence reducing the development time and maintenance cost.

Advantages of Using Hibernate • Optimize Performance • Caching is retention of data, usually in application to reduce disk access. • Hibernate, with Transparent Persistence, cache is set to application work space. • Relational tuples are moved to this cache as a result of query. It improves performance if client application reads same data many times for same write. Automatic Transparent Persistence allows the developer to concentrate more on business logic rather than this application code. (With JDBC, caching is maintained by hand-coding)

Advantages of Using Hibernate • Automatic Versioning and Time Stamping • By database versioning one can be assured that the changes done by one person is not being roll backed by another one unintentionally. • Hibernate enables developer to define version type field to application, due to this defined field Hibernate updates version field of database table every time relational tuple is updated in form of Java class object to that table. So if two users retrieve same tuple and then modify it and one user save this modified tuple to database, version is automatically updated for this tuple by Hibernate. (In JDBC there is no check that always every user has updated data. This check has to be added by the developer)

Disadvantages of Hibernate • Steep learning curve. • Use of Hibernate is an overhead for the applications which are : • Simple and use one database that never change • Need to put data to database tables, no further SQL queries • There are no objects which are mapped to two different tables (Hibernate increases extra layers and complexity. So for these types of applications JDBC is the best choice.)

Disadvantages of Hibernate • Anybody wanting to maintain application using Hibernate will need to know Hibernate. • For complex data, mapping from Object-to-tables and vise versa reduces performance and increases time of conversion. • Hibernate does not allow some type of queries which are supported by JDBC.

Hibernate Architecture Application Persistence Object Hibernate Configuration File Mapping File Relational Database

Hibernate Architecture Cont… • To use Hibernate, it is required to create Java classes that represents the table in the database and then map the instance variable in the class with the columns in the database. • Then Hibernate can be used to perform operations on the database like select, insert, update and delete the records in the table. • Hibernate automatically creates the query to perform these operations.

Hibernate Architecture Cont… • Hibernate architecture has three main components: • Connection Management: • Hibernate Connection management service provide efficient management of the database connections. • Database connection is the most expensive part of interacting with the database as it requires a lot of resources of open and close the database connection.   • Transaction Management: • Transaction management service provide the ability to the user to execute more than one database statements at a time.

Hibernate Architecture Cont… • Object Relational Mapping : • Object relational mapping is technique of mapping the data representation from an object model to a relational data model. • This part of the hibernate is used to select, insert, update and delete the records form the underlying table. • When we pass an object to a Session.save() method, Hibernate reads the state of the variables of that object and executes the necessary query.

Hibernate Architecture Cont…

Hibernate Architecture Cont… • SessionFactory (org.hibernate.SessionFactory) A threadsafe (immutable) cache of compiled mappings for a single database. A factory for Session and a client of ConnectionProvider. Might hold an optional (second-level) cache of data that is reusable between transactions, at a process- or cluster-level. • Session (org.hibernate.Session) A single-threaded, short-lived object representing a conversation between the application and the persistent store. Wraps a JDBC connection. Factory for Transaction. Holds a mandatory (first-level) cache of persistent objects, used when navigating the object graph or looking up objects by identifier.

Hibernate Architecture Cont… • Transaction (org.hibernate.Transaction) A single-threaded, short-lived object used by the application to specify atomic units of work. Abstracts application from underlying JDBC, JTA or CORBA transaction. A Session might span several Transactions in some cases. However, transaction demarcation, either using the underlying API or Transaction, is never optional! • ConnectionProvider (org.hibernate.connection.ConnectionProvider) A factory for (and pool of) JDBC connections. Abstracts application from underlying Datasource or DriverManager. Not exposed to application, but can be extended/implemented by the developer.

Hibernate Architecture Cont… • TransactionFactory (org.hibernate.TransactionFactory) A factory for Transaction instances. Not exposed to the application, but can be extended/implemented by the developer.

Creating First Hibernate App • Before you start coding you have to download Hibernate Framework from the following URL.http://olex.openlogic.com/packages/hibernate#package_detail_tabs • Create Database “vtshibernate” and Create table “contact” at the MySQL database.

First Hibernate App Cont… • Create Java Project using E-clips “FirstHibernateProject” • Create package under the src directory. (com.virtusa.contact) • Create hibernate.cfg.xml under the src folder. • Create contact.hbm.xml under the src folder. • Add doc type URL for both .xml files.

First Hibernate App Cont… • Completed hibernate.cfg.xml

Hibernate for Different Databases • DB2 - org.hibernate.dialect.DB2Dialect • HypersonicSQL - org.hibernate.dialect.HSQLDialect • Informix - org.hibernate.dialect.InformixDialect • Ingres - org.hibernate.dialect.IngresDialect • Interbase - org.hibernate.dialect.InterbaseDialect • Pointbase - org.hibernate.dialect.PointbaseDialect • PostgreSQL - org.hibernate.dialect.PostgreSQLDialect • Mckoi SQL - org.hibernate.dialect.MckoiDialect • Microsoft SQL Server - org.hibernate.dialect.SQLServerDialect • MySQL - org.hibernate.dialect.MySQLDialect • Oracle (any version) - org.hibernate.dialect.OracleDialect • Oracle 9 - org.hibernate.dialect.Oracle9Dialect • Progress - org.hibernate.dialect.ProgressDialect • FrontBase - org.hibernate.dialect.FrontbaseDialect • SAP DB - org.hibernate.dialect.SAPDBDialect • Sybase - org.hibernate.dialect.SybaseDialect • Sybase Anywhere - org.hibernate.dialect.SybaseAnywhereDialect

First Hibernate App Cont… • Completed contact.hbm.xml

First Hibernate App Cont… • <hibernate-mapping>

First Hibernate App Cont… • <class>

First Hibernate App Cont…

First Hibernate App Cont… • <id>

First Hibernate App Cont… • < generator> There are shortcut names for the built-in generators as shown below:

First Hibernate App Cont… • < property >

First Hibernate App Cont… • Create the Java class called Contact having getters and setters:

First Hibernate App Cont… • Create Test Class to Insert new Record to the Database:

First Hibernate App Cont… • Your Final Project Should appear as below:

Second Hibernate Example • Create new project to maintain following Book table. • Hint: It is enough to add Book Record to the table.

Third Hibernate Example • Create new project to maintain Insurance Information: • Hit: The program should provide functionality to add Insurance Information and also should provide functionality to modify the given Insurance information. • Now Modify the program to delete a given insurance Information

Hibernate Query Language • HQL is much like SQL  and are case-insensitive, except for the names of the Java Classes and properties. • Hibernate Query Language is used to execute queries against database. • Hibernate automatically generates the sql query and execute it against underlying database if HQL is used in the application. • HQL is based on the relational object models and makes the SQL object oriented. • Hibernate Query Language uses Classes and properties instead of tables and columns.

Advantage of using HQL • Full support for relational operations: HQL allows representing SQL queries in the form of objects. Hibernate Query Language uses Classes and properties instead of tables and columns • Return result as Object: The HQL queries return the query result(s) in the form of object(s), which is easy to use. This eliminates the need of creating the object and populate the data from result set.

Advantage of using HQL • Polymorphic Queries: HQL fully supports polymorphic queries. Polymorphic queries results the query results along with all the child objects if any. • Support for Advance features: HQL contains many advance features such as pagination, fetch join with dynamic profiling, Inner/outer/full joins, Cartesian products. It also supports Projection, Aggregation (max, avg) and grouping, Ordering, Sub queries and SQL function calls.

Understanding HQL Syntax • Any Hibernate Query Language may consist of following elements: • Clauses (from, select, where, order by, group by) • Aggregate functions (avg, min, max, sum, count) • Sub queries (query within another query)

Create following Data Set

Writing HQL Queries • Write HQL Query to View all the available data at the table. • Write a HQL query to get total count of the all the records. • Write a HQL query to get count of the insurance based on the Amount.

Writing HQL Queries Cont… • Write a HQL query to get count of the insurance based on the Insurance Name. • Write HQL query to get the Avg/Max/Min of the total Amounts.

Criteria Query • The interface org.hibernate.Criteria represents a query against a particular persistent class. The Session is a factory for Criteria instances. • An individual query criterion is an instance of the interface org.hibernate.criterion.Criterion. • The class org.hibernate.criterion.Restrictions defines factory methods for obtaining certain built-in Criterion types. Ref: http://docs.jboss.org/hibernate/core/3.3/reference/en/html/querycriteria.html

Criteria Query Cont… • Criteria Interface provides the following methods

Criteria Query Cont… • Class Restriction provides built-in criterion via static factory methods

Criteria Query Cont…

Criteria Query Cont… • Criteria Query Exercises 01: • Create Sample program to display Insurance records which are having Amount in-between 1000 and 2500. (Make sure that you should display maximum only 5 records) • Criteria Query Exercises 02: • Create sample program to return Insurance records which are having investment date in-between 2005/01/01 to 2005/03/03. (Make sure that you should display maximum only 5 records)

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http://www.learntek.org/product/hibernate-training/ Learntek is global online training provider on Big Data Analytics, Hadoop, Machine Learning, Deep Learning, IOT, AI, Cloud Technology, DEVOPS, Digital Marketing and other IT and Management courses. We are dedicated to designing, developing and implementing training programs for students, corporate employees and business professional. www.learntek.org

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Summer Woods Minitheme

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Spring-Hibernate tutorial - PowerPoint PPT Presentation

Spring-Hibernate tutorial

Appfuse is an open-source java ee web application framework. ... download struts and spring1. 1. download and install the following components: ... – powerpoint ppt presentation.

• Spring Live (chapter 2 posted online)
• AppFuse is an open-source Java EE web application framework. It is designed for quick and easy start up of development, while also using open-source Java technologies such as Spring framework, Hibernate and Struts. AppFuse was originally created by Matt Raible, who wanted to eliminate the "ramp up" time in building new web applications.
• AppFuse provides a project skeleton, similar to the one that's created by an IDE when one clicks through a "new web project" wizard. AppFuse 1.x uses Ant to create the project, as well as build/test/deploy it, whereas AppFuse 2.x uses Maven 2 for these tasks. IDE support was improved in 2.0 by leveraging Maven plugins to generate IDE project files. AppFuse 1.x uses XDoclet and JDK 1.4.
• Unlike other "new project" wizards, the AppFuse wizard creates a number of additional classes and files that implement features, but also serve as examples for the developer. The project is pre-configured to talk to a database, to deploy in an appserver, and to allow logging in.
• When AppFuse was first developed, it only supported Struts and Hibernate. In version 2.x, it supports Hibernate, iBATIS or JPA as persistence frameworks. For implementing the MVC model, AppFuse is compatible with JSF, Spring MVC, Struts 2 or Tapestry.
• Features integrated into AppFuse includes the following
• Authentication and Authorization
• Remember Me (saving your login information so you don't have to login every time)
• /Registration
• SSL Switching
• URL rewriting
• Skinnability
• Page Decoration
• Templated Layout
• File Upload
• This out-of-the-box functionality is one of the main features in AppFuse that separates it from the other "CRUD Generation" frameworks, including Ruby on Rails and Grails. The aforementioned framework, as well as AppFuse, allow you to create master/detail pages from database tables or existing model objects.
• This tutorial is posted at
• http//www.scribd.com/doc/7074123/Spring-Live-Matt -Raible
• A newer tutorial has been posted at
• http//www.sourcebeat.com/titles/springlive/public /Rev_12/SpringLive_SampleChapter.pdf
• code online for both tutorials
• http//svn.sourcebeat.com/svn/sourcebeat/trunk/dow nloads/
• Below are the ordered steps you will perform
• 1. Download Struts and Spring.
• 2. Create project directories and an Ant build file.
• 3. Create a unit test for the persistence layer.
• 4. Configure Hibernate and Spring.
• 5. Create Hibernate DAO implementation.
• 6. Run the unit test and verify CRUD with DAO.
• 7. Create manager and declare transactions.
• 8. Create a unit test for the Struts action.
• 9. Create an action and model (DynaActionForm) for the web layer.
• 10. Run the unit test and verify CRUD with action.
• 11. Create JavaServer Pages (JSPs) to allow CRUD through a web browser.
• 12. Verify the JSPs functionality through your browser.
• 13. Add Validation use Commons Validator.
• Download Struts and Spring1
• 1. Download and install the following components
• ?? Java Development Kit (JDK) 1.4.2 (or above)
• ?? Tomcat 5.0
• ?? Ant 1.6.1
• 2. Set up the following environment variables
• ?? JAVA_HOME
• ?? ANT_HOME
• ?? CATALINA_HOME
• 3. Add the following to your PATH environment variable
• ?? JAVA_HOME/bin
• ?? ANT_HOME/bin
• ?? CATALINA_HOME/bin
• To develop a Java-based web application, developers usually download JARs, create a directory
• structure, and create an Ant build file. For a Struts-only application, this can be simplified
• by using the struts-blank.war, which is part of the standard Struts distribution. For a web app
• using Springs MVC framework, you can use the webapp-minimal application that ships with
• Spring. Both of these are nice starting points, but neither simplifies the Struts-Spring integration
• nor takes into account unit testing. Therefore, I created Equinox, both for this book and
• to help developers get started quickly with Spring.
• Equinox is a bare-bones starter application for creating a Spring-based web application. It has
• a pre-defined directory structure, an Ant build file (for compiling, deploying and testing), and
• all the JARs you will need for a Struts, Spring and Hibernate-based web app. Much of the
• directory structure and build file in Equinox is taken from my open source AppFuse application.
• Therefore, Equinox is really just an AppFuse Light that allows rapid web app development
• with minimal setup. Because it is derived from AppFuse, you will see many references to
• it in package names, database names and other areas. This is done purposefully so you can
• migrate from an Equinox-based application to a more robust AppFuse-based application.
• In order to start MyUsers, download Equinox 1.0 from sourcebeat.com/downloads and
• extract it to an appropriate location.
• Download equinox http//www.sourcebeat.com/downlo ads
• To set up your initial directory structure and Ant build file, extract the Equinox downloadonto your hard drive. I recommend putting projects in C\Source on Windows and /devon Unix or Linux. For Windows users, now is a good time set your HOME environment variable to C\Source. The easiest way to get started with Equinox is to extract it to your preferred source location, cd into the equinox directory and run ant new -Dapp.namemyusers from the command line.
• Warning You must have the CATALINA_HOME environment variable set, or building MyUsers will not work. This is because its build.xml depends on a catalina-ant.jar file for running Tomcats Ant tasks (covered shortly). As an alternative, you can specify a Tomcat.home property in build.properties that points to your Tomcat installation.
• echo Available targets are
• echo compile --gt Compile all Java files
• echo war --gt Package as WAR file
• echo deploy --gt Deploy application as directory
• echo deploywar --gt Deploy application as a WAR file
• echo install --gt Install application in Tomcat
• echo remove --gt Remove application from Tomcat
• echo reload --gt Reload application in Tomcat
• echo start --gt Start Tomcat application
• echo stop --gt Stop Tomcat application
• echo list --gt List Tomcat applications
• echo clean --gt Deletes compiled classes and WAR
• echo new --gt Creates a new project
• Tomcat ships with a number of Ant tasks that allow you to install, remove and reload web apps using its Manager application. The easiest way to declare and use these tasks is to create a properties file that contains all the definitions. In Equinox, a tomcatTasks.properties file is in the base directory with contents
• deployorg.apache.catalina.ant.DeployTask
• undeployorg.apache.catalina.ant.UndeployTask
• removeorg.apache.catalina.ant.RemoveTask
• reloadorg.apache.catalina.ant.ReloadTask
• startorg.apache.catalina.ant.StartTask
• stoporg.apache.catalina.ant.StopTask
• listorg.apache.catalina.ant.ListTask
• lt!-- Tomcat Ant Tasks --gt
• lttaskdef file"tomcatTasks.properties"gt
• ltclasspathgt
• ltpathelement
• path"tomcat.home/server/lib/catalina-ant.jar"/ gt
• lt/classpathgt
• lt/taskdefgt
• lttarget name"install" description"Install application in Tomcat"
• depends"war"gt
• ltdeploy url"tomcat.manager.url"
• username"tomcat.manager.username"
• password"tomcat.manager.password"
• path"/webapp.name"
• war"filedist.dir/webapp.name.war"/gt
• lt/targetgt
• lttarget name"remove" description"Remove application from Tomcat"gt
• ltundeploy url"tomcat.manager.url"
• ltreload url"tomcat.manager.url"
• path"/webapp.name"/gt
• lttarget name"start" description"Start Tomcat application"gt
• ltstart url"tomcat.manager.url"
• lttarget name"stop" description"Stop Tomcat application"gt
• ltstop url"tomcat.manager.url"
• lttarget name"list" description"List Tomcat applications"gt
• ltlist url"tomcat.manager.url"
• Properties for Tomcat Server
• tomcat.manager.urlhttp//localhost8080/manager
• tomcat.manager.usernameadmin
• tomcat.manager.passwordadmin
• Edit CATALINA_HOME/conf/tomcat-users.xml to make sure this line is there.
• ltuser username"admin" password"admin" roles"manager"/gt
• C\equinox-1.0\myusersgtant list
• Buildfile build.xml
• list OK - Listed applications for virtual host localhost
• list /running0ROOT
• list /managerrunning0manager
• list /StatefulCounterEJBrunning0Stateful CounterEJB
• list /myusersrunning0myusers
• list /ejb-examples-1.1running0ejb-exampl es-1.1
• list /blazedsrunning0blazeds
• list /HelloBeanrunning0HelloBean
• list /jndiservletrunning0jndiservlet
• list /docsrunning0docs
• list /openejbrunning0openejb
• list /LookupServletrunning0LookupServlet
• list /ejb-examplesrunning0ejb-examples
• list /myexamplesrunning0myexamples
• list /hello-openejbrunning0hello-openejb
• Running ant deploy will deploy myusers.
• Warning In order for the in-memory HSQLDB to work correctly with MyUsers, start Tomcat from the same directory from which you run Ant. Type CATALINA_HOME/bin/startup.sh on Unix/Linux and CATALINA_HOME\bin\startup.bat on Windows. You can also change the database settings to use an absolute path.
• 1. Create a UserDAOTest.java class in the test/org/appfuse/dao directory. This class should
• extend BaseDAOTestCase, which already exists in this package. This parent class
• initializes Springs ApplicationContext from the web/WEB-INF/applicationContext.xml file.
• Listing 2.6 is the code you will need to begin writing your UserDAOTest.java
• Listing 2.6
• Note Automatically importing necessary classes is a nice feature of modern IDEs like
• Eclipse and IDEA. Equinox contains the project necessary for both of these IDEs.
• This class wont compile yet because you havent created your UserDAO interface. Before you
• do that, write a couple of tests to verify CRUD works on the User object.
• 2. Add the testSave and testAddAndRemove methods to the UserDAOTest class, as
• shown in Listing 2.7
• Listing 2.7
• package org.appfuse.dao
• // use your IDE to handle imports
• public class UserDAOTest extends BaseDAOTestCase
• private User user null
• private UserDAO dao null
• protected void setUp() throws Exception
• super.setUp()
• Add the testSave and testAddAndRemove methods to the UserDAOTest class, as
• dao (UserDAO) ctx.getBean("userDAO")
• protected void tearDown() throws Exception
• super.tearDown()
• public void testSaveUser() throws Exception
• user new User()
• user.setFirstName("Rod")
• user.setLastName("Johnson")dao.saveUser(user)
• assertNotNull("primary key assigned", user.getId())
• From these test methods, you can see that you need to create a UserDAO with the following
• saveUser(User)
• removeUser(Long)
• getUser(Long)
• getUsers() (to return all the users in the database)
• 3. Create a UserDAO.java file in the src/org/appfuse/dao directory and populate it with the
• code in Listing 2.8
• public interface UserDAO extends DAO
• public List getUsers()
• public User getUser(Long userId)
• public void saveUser(User user)
• public void removeUser(Long userId)
• Finally, in order for the UserDAOTest and UserDAO to compile, create a User object to persist.
• Create a User.java class in the src/org/appfuse/model directory and add id, firstName
• and lastName as member variables, as shown
• package org.appfuse.model
• public class User extends BaseObject
• private Long id
• private String firstName
• private String lastName
• Generate your getters and setters using your favorite IDE
• Right-click -gt Source -gt Generate Getters and Setters
• Notice that youre extending a BaseObject class which is already defined. It has methods toString(), equals() and hashCode(). The latter two are required by Hibernate.
• In the src/org/appfuse/model directory, create a file named User.hbm.xml
• lt?xml version"1.0" encoding"UTF-8"?gt
• lt!DOCTYPE hibernate-mapping PUBLIC
• "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
• "http//hibernate.sourceforge.net/hibernate-mappin g-2.0.dtd"gt
• lthibernate-mappinggt
• ltclass name"org.appfuse.model.User" table"app_user"gt
• ltid name"id" column"id" unsaved-value"0"gt
• ltgenerator class"increment" /gt
• ltproperty name"firstName" column"first_name"
• not-null"true"/gt
• ltproperty name"lastName" column"last_name" not-null"true"/gt
• lt/hibernate-mappinggt
• Add this mapping to Springs applicationContext.x ml file in the web/WEB-INF directory. Open this file and look for ltproperty name"mappingResources "gt and change it to
• ltproperty name"mappingResources"gt
• ltvaluegtorg/appfuse/model/User.hbm.xmllt/valuegt
• lt/propertygt
• In the applicationContext.xml file, you can see how the database is set up and Hibernate is configured to work with Spring. Equinox is designed to work with an HSQL database named db/appfuse. It will be created in your projects db directory. Details of this configuration will be covered in the How Spring is configured in Equinox section.
• INFO - SchemaExport.execute(98) Running hbm2ddl schema export
• INFO - SchemaExport.execute(117) exporting generated schema to database
• INFO - ConnectionProviderFactory.newConnectionProv ider(53) Initializing
• connection provider org.springframework.orm.hiber nate
• .LocalDataSourceConnectionProvider
• INFO - DriverManagerDataSource.getConnectionFromDr iverManager(140)
• Creating new JDBC connection to jdbchsqldbdb/appfuse
• INFO - SchemaExport.execute(160) schema export complete
• It is very easy to configure any J2EE-based web application to use Spring. At the very least, you can simply add Springs ContextLoaderListener to your web.xml file
• ltlistenergt
• ltlistener-classgt
• org.springframework.web.context.ContextLoaderListe ner
• lt/listener-classgt
• lt/listenergt
• This is a ServletContextListener that initializes when your web app starts up. By default, it looks for Springs configuration file at WEB-INF/applicationContext.xml. You can change this default value by specifying a ltcontext-paramgt element named contextConfig-
• Look at the full contents of your applicationContext.xml file
• ltcontext-paramgt
• ltparam-namegtcontextConfigLocationlt/param-namegt
• ltparam-valuegt/WEB-INF/sampleContext.xmllt/param-val uegt
• lt/context-paramgt
• lt!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
• "http//www.springframework.org/dtd/spring-beans.d td"gt
• ltbean id"dataSource"
• class"org.springframework.jdbc.datasource.DriverM anagerDataSource"gt
• ltproperty name"driverClassName"gt
• ltvaluegtorg.hsqldb.jdbcDriverlt/valuegt
• ltproperty name"url"gt
• ltvaluegtjdbchsqldbdb/appfuselt/valuegt
• ltproperty name"username"gtltvaluegtsalt/valuegtlt/prope rtygt
• lt!-- Make sure ltvaluegt tags are on same line - if they're not,
• ltprop key"hibernate.dialect"gt
• net.sf.hibernate.dialect.HSQLDialect
• ltprop key"hibernate.hbm2ddl.auto"gtcreatelt/propgt
• lt!-- Transaction manager for a single Hibernate SessionFactory --gt
• ltbean id"transactionManager"
• class"org.springframework.orm.hibernate.Hibernate TransactionManager"gt
• ltproperty name"sessionFactory"gt
• ltref local"sessionFactory"/gt
• The first bean (dataSource) represents an HSQL database, and the second bean (session-Factory) has a dependency on that bean. Spring just calls setDataSource (DataSource) on the LocalSessionFactoryBean to make this work. If you wanted to use a Java Naming and Directory Interface (JNDI) DataSource instead, you could easily change this beans definition to something similar to
• class"org.springframework.jndi.JndiObjectFactoryB ean"gt
• ltproperty name"jndiName"gt
• ltvaluegtjavacomp/env/jdbc/appfuselt/valuegt
• Also note the hibernate.hbm2ddl.auto property in the sessionFactory definition. This property creates the database tables automatically when the application starts. Other possible values are update and create-drop.The last bean configured is the transactionManager (and nothing is stopping you from using a Java Transaction API JTA transaction manager), which is necessary to perform distributed transactions across two databases. If you want to use a JTA transaction manager, simply change this beans class attribute to org.springframework.transaction.jta.J ta-TransactionManager. Now you can implement the UserDAO with Hibernate.
• package org.appfuse.dao.hibernate
• // organize imports using your IDE
• public class UserDAOHibernate extends HibernateDaoSupport implements
• private Log log LogFactory.getLog(UserDAOHiberna te.class)
• return getHibernateTemplate().find("from User")
• public User getUser(Long id)
• return (User) getHibernateTemplate().get(User.clas s, id)
• getHibernateTemplate().saveOrUpdate(user)
• if (log.isDebugEnabled())
• log.debug("userId set to " user.getId())
• public void removeUser(Long id)
• Object user getHibernateTemplate().load(User.cla ss, id)
• Springs HibernateDaoSupport class is a convenient super class for Hibernate DAOs. It has
• handy methods you can call to get a Hibernate Session, or a SessionFactory. The most convenient
• method is getHibernateTemplate(), which returns a HibernateTemplate. This
• template wraps Hibernate checked exceptions with runtime exceptions, allowing your DAO
• interfaces to be Hibernate exception-free.
• Nothing is in your application to bind UserDAO to UserDAOHibernate, so you must create
• that relationship.
• 2. For Spring to recognize the relationship, add the lines in Listing 2.18 to the web/WEBINF/
• applicationContext.xml file.
• ltbean id"userDAO" class"org.appfuse.dao.hibernat e.UserDAOHibernate"gt

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How To Get Free Access To Microsoft PowerPoint

E very time you need to present an overview of a plan or a report to a whole room of people, chances are you turn to Microsoft PowerPoint. And who doesn't? It's popular for its wide array of features that make creating effective presentations a walk in the park. PowerPoint comes with a host of keyboard shortcuts for easy navigation, subtitles and video recordings for your audience's benefit, and a variety of transitions, animations, and designs for better engagement.

But with these nifty features comes a hefty price tag. At the moment, the personal plan — which includes other Office apps — is at $69.99 a year. This might be the most budget-friendly option, especially if you plan to use the other Microsoft Office apps, too. Unfortunately, you can't buy PowerPoint alone, but there are a few workarounds you can use to get access to PowerPoint at no cost to you at all.

Read more: The 20 Best Mac Apps That Will Improve Your Apple Experience

Method #1: Sign Up For A Free Microsoft Account On The Office Website

Microsoft offers a web-based version of PowerPoint completely free of charge to all users. Here's how you can access it:

• Visit the Microsoft 365 page .
• If you already have a free account with Microsoft, click Sign in. Otherwise, press "Sign up for the free version of Microsoft 365" to create a new account at no cost.
• On the Office home page, select PowerPoint from the side panel on the left.
• Click on "Blank presentation" to create your presentation from scratch, or pick your preferred free PowerPoint template from the options at the top (there's also a host of editable templates you can find on the Microsoft 365 Create site ).
• Create your presentation as normal. Your edits will be saved automatically to your Microsoft OneDrive as long as you're connected to the internet.

It's important to keep in mind, though, that while you're free to use this web version of PowerPoint to create your slides and edit templates, there are certain features it doesn't have that you can find on the paid version. For instance, you can access only a handful of font styles and stock elements like images, videos, icons, and stickers. Designer is also available for use on up to three presentations per month only (it's unlimited for premium subscribers). When presenting, you won't find the Present Live and Always Use Subtitles options present in the paid plans. The biggest caveat of the free version is that it won't get any newly released features, unlike its premium counterparts.

Method #2: Install Microsoft 365 (Office) To Your Windows

Don't fancy working on your presentation in a browser? If you have a Windows computer with the Office 365 apps pre-installed or downloaded from a previous Office 365 trial, you can use the Microsoft 365 (Office) app instead. Unlike the individual Microsoft apps that you need to buy from the Microsoft Store, this one is free to download and use. Here's how to get free PowerPoint on the Microsoft 365 (Office) app:

• Search for Microsoft 365 (Office) on the Microsoft Store app.
• Install and open it.
• Sign in with your Microsoft account. Alternatively, press "Create free account" if you don't have one yet.
• Click on Create on the left side panel.
• Select Presentation.
• In the PowerPoint window that opens, log in using your account.
• Press Accept on the "Free 5-day pass" section. This lets you use PowerPoint (and Word and Excel) for five days — free of charge and without having to input any payment information.
• Create your presentation as usual. As you're using the desktop version, you can access the full features of PowerPoint, including the ability to present in Teams, export the presentation as a video file, translate the slides' content to a different language, and even work offline.

The only downside of this method is the time limit. Once the five days are up, you can no longer open the PowerPoint desktop app. However, all your files will still be accessible to you. If you saved them to OneDrive, you can continue editing them on the web app. If you saved them to your computer, you can upload them to OneDrive and edit them from there.

Method #3: Download The Microsoft PowerPoint App On Your Android Or iOS Device

If you're always on the move and need the flexibility of creating and editing presentations on your Android or iOS device, you'll be glad to know that PowerPoint is free and available for offline use on your mobile phones. But — of course, there's a but — you can only access the free version if your device is under 10.1 inches. Anything bigger than that requires a premium subscription. If your phone fits the bill, then follow these steps to get free PowerPoint on your device:

• Install Microsoft PowerPoint from the App Store or Google Play Store .
• Log in using your existing Microsoft email or enter a new email address to create one if you don't already have an account.
• On the "Get Microsoft 365 Personal Plan" screen, press Skip For Now.
• If you're offered a free trial, select Try later (or enjoy the free 30-day trial if you're interested).
• To make a new presentation, tap the plus sign in the upper right corner.
• Change the "Create in" option from OneDrive - Personal to a folder on your device. This allows you to save the presentation to your local storage and make offline edits.
• Press "Set as default" to set your local folder as the default file storage location.
• Choose your template from the selection or use a blank presentation.
• Edit your presentation as needed.

Do note that PowerPoint mobile comes with some restrictions. There's no option to insert stock elements, change the slide size to a custom size, use the Designer feature, or display the presentation in Immersive Reader mode. However, you can use font styles considered premium on the web app.

Method #4: Use Your School Email Address

Office 365 Education is free for students and teachers, provided they have an email address from an eligible school. To check for your eligibility, here's what you need to do:

• Go to the Office 365 Education page .
• Type in your school email address in the empty text field.
• Press "Get Started."
• On the next screen, verify your eligibility. If you're eligible, you'll be asked to select whether you're a student or a teacher. If your school isn't recognized, however, you'll get a message telling you so.
• For those who are eligible, proceed with creating your Office 365 Education account. Make sure your school email can receive external mail, as Microsoft will send you a verification code for your account.
• Once you're done filling out the form, press "Start." This will open your Office 365 account page.

You can then start making your PowerPoint presentation using the web app. If your school's plan supports it, you can also install the Office 365 apps to your computer by clicking the "Install Office" button on your Office 365 account page and running the downloaded installation file. What sets the Office 365 Education account apart from the regular free account is that you have unlimited personal cloud storage and access to other Office apps like Word, Excel, and Outlook.

Read the original article on SlashGear .