Hibernate persistence operations

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
   <!-- <session-factory> <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> 
		hibernate word is optional <property name="connection.url">jdbc:oracle:thin:@localhost:1521:ORCL</property> 
		<property name="hibernate.connection.username">kcv</property> <property name="hibernate.connection.password">kcv</property> 
		<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property> 
		<property name="show_sql">true</property> <mapping resource="Employee.hbm.xml"/> 
		</session-factory> -->
   <session-factory>
      <property name="hibernate.current_session_context_class">thread</property>
      <property name="hbm2ddl.auto">create</property>
      <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
      <property name="connection.url">jdbc:postgresql://localhost:5432/hibernate</property>
      <property name="connection.username">postgres</property>
      <property name="connection.password">password</property>
      <property name="connection.driver_class">org.postgresql.Driver</property>
      <property name="show_sql">true</property>
      <property name="format_sql">true</property>
      <property name="use_sql_comments">true</property>
      		<mapping resource="EmployeeBean.hbm.xml" />
   </session-factory>
</hibernate-configuration>



 
<?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.cv.hibernate.model.EmployeeBean" table="Employee_refresh">
		<id name="id" column="EID" type="long" />
		<property name="firstName" column="FIRSTNAME" />
		<property name="lastName" column="LASTNAME" />
		<property name="email" column="EMAIL" />
	</class>
</hibernate-mapping>



 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Delete {



  private final static Logger logger = Logger.getLogger(Delete.class);



  public static void main(String args[]) throws Exception {

    //Am creating a record in the database with the ID 101

    HibernateUtil.saveOrUpdate();

    Session session = HibernateUtil.getSession();

    Thread.sleep(5000);

    EmployeeBean eb = new EmployeeBean();

    eb.setId(new Long(101));

    session.beginTransaction();

    session.delete(eb);

    session.getTransaction().commit();

    logger.info("deleted successfully...");

    HibernateUtil.closeSession();

  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/** @author Chandra Vardhan */



public class Get {



  private final static Logger logger = Logger.getLogger(Get.class);



  public static void main(String args[]) throws Exception {

    HibernateUtil.saveOrUpdate();

    Session session = HibernateUtil.getSession();

    EmployeeBean eb = (EmployeeBean) session.get(EmployeeBean.class,

        new Long(101));

    

    logger.info("get is called... observe that hibernate select query already generated before this line...");

    logger.info("Id of the Employee : "+eb.getId());

    logger.info(eb.getFirstName() + " " + eb.getLastName() + " "

        + eb.getEmail());

    HibernateUtil.closeSession();



  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Get_vs_Load {



  private final static Logger logger = Logger.getLogger(Get_vs_Load.class);



  public static void main(String args[]) throws Exception {

    HibernateUtil.saveOrUpdate();

    Session session = HibernateUtil.getSession();

    EmployeeBean get1 = (EmployeeBean) session.get(EmployeeBean.class,

        new Long(101));

    logger.info("EmployeeBean get called");

    logger.info("EmployeeBean ID= " + get1.getId());



    EmployeeBean get2 = (EmployeeBean) session.get(EmployeeBean.class,

        new Long(102));

    logger.info("EmployeeBean get called");

    logger.info("EmployeeBean ID= " + get2.getId());

    logger.info("EmployeeBean ID= " + get2.getLastName());



    // load Example

    EmployeeBean load1 = (EmployeeBean) session.load(EmployeeBean.class,

        new Long(103));

    logger.info("EmployeeBean load called");

    logger.info("EmployeeBean ID= " + load1.getId());



    EmployeeBean load2 = (EmployeeBean) session.get(EmployeeBean.class,

        new Long(104));

    logger.info("EmployeeBean get called");

    logger.info("EmployeeBean ID= " + load2.getId());

    HibernateUtil.closeSession();



  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Load {



  private final static Logger logger = Logger.getLogger(Load.class);



  public static void main(String[] args) throws Exception {

    

    HibernateUtil.saveOrUpdate();

    

    Session session = HibernateUtil.getSession();



    session.beginTransaction();



    EmployeeBean eb = new EmployeeBean();



    session.load(eb, new Long(103));



    logger.info(eb.getId() + " " + eb.getFirstName() + " " + eb.getLastName() + " " + eb.getEmail());



    EmployeeBean eb2 = (EmployeeBean) session.load(EmployeeBean.class, new Long(102));



    logger.info(eb2.getId());



    logger.info(eb2.getId() + " " + eb2.getFirstName() + " " + eb2.getLastName() + " " + eb2.getEmail());

    session.getTransaction().commit();

    HibernateUtil.closeSession();



  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;

import org.hibernate.Transaction;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Merge {

  private final static Logger logger = Logger.getLogger(Merge.class);



  public static void main(String[] args) throws Exception {

    // HibernateUtil.saveOrUpdate();

    Session session = HibernateUtil.getSession();

    EmployeeBean eb = new EmployeeBean();

    eb.setId(100);

    session.beginTransaction();

    logger.info("before set...");

    eb.setFirstName("chandra");

    eb.setLastName("vardhan");

    eb.setEmail("meetkodam@gmail.com");

    logger.info("before merge(eb)...");

    logger.info(eb.getId() + " " + eb.getFirstName() + " " + eb.getLastName() + " " + eb.getEmail());

    EmployeeBean eb1 = (EmployeeBean) session.merge(eb);

    logger.info("after merge(eb)...");

    eb1.setLastName("kodam");

    eb1.setEmail("nara@gmail.com");

    EmployeeBean eb2 = (EmployeeBean) session.merge(eb1);

    logger.info(eb2.getId() + " " + eb2.getFirstName() + " " + eb2.getLastName() + " " + eb2.getEmail());



    session.getTransaction().commit();

    HibernateUtil.closeSession();



  }

}


 

    
package com.cv.hibernate.model;



/**

 * @author Chandra Vardhan

 */

public class EmployeeBean {

  private long id;

  private String firstName;

  private String lastName;

  private String email;



  public long getId() {

    return id;

  }



  public void setId(long id) {

    this.id = id;

  }



  public String getFirstName() {

    return firstName;

  }



  public void setFirstName(String firstName) {

    this.firstName = firstName;

  }



  public String getLastName() {

    return lastName;

  }



  public void setLastName(String lastName) {

    this.lastName = lastName;

  }



  public String getEmail() {

    return email;

  }



  public void setEmail(String email) {

    this.email = email;

  }



}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Persist {

  

  private final static Logger logger = Logger.getLogger(Persist.class);



  public static void main(String args[]) throws Exception {

    Session session = HibernateUtil.getSession();

    EmployeeBean eb = new EmployeeBean();

    eb.setId(100);

    eb.setFirstName("chandra");

    eb.setLastName("vardhan");

    eb.setEmail("meetkodam@gmail.com");

    session.beginTransaction();

    session.persist(eb);//persist(-) doesn't return any value

    session.getTransaction().commit();

    logger.info("saved successfully...");

    HibernateUtil.closeSession();

    

  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Save {



  private final static Logger logger = Logger.getLogger(Save.class);



  public static void main(String args[]) throws Exception {



    Session ses = HibernateUtil.getSession();

    EmployeeBean eb = new EmployeeBean();

    eb.setId(101);

    eb.setFirstName("chandra");

    eb.setLastName("vardhan");

    eb.setEmail("meetkodam@gmail.com");

    ses.beginTransaction();

    ses.save(eb);

    ses.getTransaction().commit();

    logger.info("Saved successfully...");

    HibernateUtil.closeSession();



  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class SaveORUpdate {



  private final static Logger logger = Logger.getLogger(SaveORUpdate.class);



  public static void main(String[] args) throws Exception {

    Session session = HibernateUtil.getSession();

    EmployeeBean eb = new EmployeeBean();

    eb.setId(new Long(101));

    eb.setFirstName("chandra");

    eb.setLastName("vardhan");

    eb.setEmail("meetkodam@gmail.com");

    session.beginTransaction();

    session.saveOrUpdate(eb);

    logger.info("Saved successfully... ");

    session.getTransaction().commit();

    HibernateUtil.closeSession();

  }

}


 

    
package com.cv.hibernate;



import org.apache.log4j.Logger;

import org.hibernate.Session;



import com.cv.hibernate.model.EmployeeBean;

import com.cv.hibernate.util.HibernateUtil;



/**

 * @author Chandra Vardhan

 */

public class Update {



  private final static Logger logger = Logger.getLogger(Update.class);



  public static void main(String[] args) throws Exception {



    Session session = HibernateUtil.getSession();

    EmployeeBean eb = new EmployeeBean();

    eb.setId(101);

    eb.setFirstName("nara");

    eb.setLastName("kodam");

    eb.setEmail("meetkodam@gmail.com");

    session.beginTransaction();

    session.update(eb);

    logger.info(eb.getId() + " " + eb.getFirstName() + " " + eb.getLastName() + " " + eb.getEmail());

    session.getTransaction().commit();

    HibernateUtil.closeSession();

  }

}


 

    
package com.cv.hibernate.util;



import org.apache.log4j.Logger;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import org.hibernate.cfg.Configuration;



import com.cv.hibernate.model.EmployeeBean;



/**

 * @author Chandra Vardhan

 */

/**

 * Configures and provides access to Hibernate sessions, tied to the current

 * thread of execution. Follows the Thread Local Session pattern, see

 * {@link http://hibernate.org/42.html }.

 */

public class HibernateUtil {

  private final static Logger logger = Logger.getLogger(HibernateUtil.class);



  /**

   * Location of hibernate.cfg.xml file. Location should be on the classpath

   * as Hibernate uses #resourceAsStream style lookup for its configuration

   * file. The default classpath location of the hibernate config file is in

   * the default package. Use #setConfigFile() to update the location of the

   * configuration file for the current session.

   */

  private static String CONFIG_FILE_LOCATION = "hibernate.cfg.xml";

  private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();

  private static Configuration configuration = new Configuration();

  private static SessionFactory sessionFactory;



  static {

    try {

      configuration = configuration.configure(CONFIG_FILE_LOCATION);

      StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()

          .applySettings(configuration.getProperties());

      sessionFactory = configuration.buildSessionFactory(builder.build());

      logger.info("%%%% Connection successful %%%%");

    } catch (Exception e) {

      logger.error("%%%% Error Creating SessionFactory %%%%");

      e.printStackTrace();

    }

  }



  private HibernateUtil() {

  }



  /**

   * Returns the ThreadLocal Session instance. Lazy initialize the

   * <code>SessionFactory</code> if needed.

   * 

   * @return Session

   * @throws HibernateException

   */

  public static Session getSession() throws HibernateException {

    Session session = (Session) threadLocal.get();



    if (session == null || !session.isOpen()) {

      if (sessionFactory == null) {

        rebuildSessionFactory();

      }

      session = (sessionFactory != null) ? sessionFactory.openSession() : null;

      threadLocal.set(session);

    }



    return session;

  }



  /**

   * Rebuild hibernate session factory

   * 

   */

  public static void rebuildSessionFactory() {

    try {

      configuration = configuration.configure(CONFIG_FILE_LOCATION);

      StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()

          .applySettings(configuration.getProperties());

      sessionFactory = configuration.buildSessionFactory(builder.build());

      logger.info("%%%% Connection successful %%%%");

    } catch (Exception e) {

      logger.error("%%%% Error Creating SessionFactory %%%%");

      e.printStackTrace();

    }

  }



  /**

   * Close the single hibernate session instance.

   * 

   * @throws HibernateException

   */

  public static void closeSession() throws HibernateException {

    Session session = (Session) threadLocal.get();

    threadLocal.set(null);



    if (session != null) {

      session.close();

      System.exit(0);

    }

  }



  /**

   * return session factory

   * 

   */

  public static SessionFactory getSessionFactory() {

    return sessionFactory;

  }



  /**

   * return hibernate configuration

   * 

   */

  public static Configuration getConfiguration() {

    return configuration;

  }



  public static void saveOrUpdate() {

    Session session = getSession();

    for (int i = 101; i < 106; i++) {

      EmployeeBean eb = new EmployeeBean();

      eb.setId(new Long(i));

      eb.setFirstName("chandra");

      eb.setLastName("vardhan");

      eb.setEmail("meetkodam@gmail.com");

      session.beginTransaction();

      session.saveOrUpdate(eb);

      session.getTransaction().commit();

    }

    session.close();

    logger.info("Saved successful...");



  }

}







#By default enabling Console appender
# Root logger option
log4j.rootLogger=INFO, stdout

# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n

# Redirect log messages to a log file
#log4j.appender.file=org.apache.log4j.RollingFileAppender
#log4j.appender.file.File=C:\\servlet-application.log
#log4j.appender.file.MaxFileSize=5MB
#log4j.appender.file.MaxBackupIndex=10
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n 


	
<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>com.cv.hibernate</groupId>
  <artifactId>All_operations</artifactId>
  <version>1.0</version>
 
	<dependencies>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-entitymanager</artifactId>
			<version>4.3.5.Final</version>
		</dependency>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-c3p0</artifactId>
			<version>4.3.5.Final</version>
		</dependency>

		<dependency>
			<artifactId>hibernate-core</artifactId>
			<groupId>org.hibernate</groupId>
			<version>4.3.5.Final</version>
		</dependency>

		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-validator</artifactId>
			<version>4.2.0.Final</version>
		</dependency>
		<dependency>
			<groupId>org.hibernate.common</groupId>
			<artifactId>hibernate-commons-annotations</artifactId>
			<version>4.0.4.Final</version>
		</dependency>
		<dependency>
			<groupId>org.hibernate.javax.persistence</groupId>
			<artifactId>hibernate-jpa-2.0-api</artifactId>
			<version>1.0.1.Final</version>
		</dependency>

		<dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
			<version>1.0.0.GA</version>
			provided
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.6.4</version>
		</dependency>
		<dependency>
			<groupId>org.jboss.logging</groupId>
			<artifactId>jboss-logging</artifactId>
			<version>3.1.0.CR2</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.6.4</version>
		</dependency>
		<dependency>
			<groupId>postgresql</groupId>
			<artifactId>postgresql</artifactId>
			<version>9.1-901.jdbc4</version>
		</dependency>
		
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-simple</artifactId>
			<version>1.7.5</version>
		</dependency>
	</dependencies>
	<build>

		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>


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