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Hibernate

  • Advantage of Hibernate over JDBC
  • Hibernate Setup with an web Application
  • First Hibernate Application
  • Hibernate mapping with Database TABLE
  • Hibernate Data Type-Java Data Type - SQL Data Type mapping
  • One to Many Relation in Hibernate
  • One to Many Relation in Hibernate bi-directional
  • Many to Many Relation in Hibernate
  • HQL: The Hibernate Query Language
  • Criteria Queries
  • Criteria Queries : Equal (eq), Not Equal(ne), Less than (le), greater than (gt),greater than or equal(ge) and Ordering the results
  • Criteria Queries: And OR conditions
  • Hibernate generator to generate id (primary key)
  • prevent concurrent update in Hibernate,slate object updatation in Hibernate,version checking in Hibernate

    Struts


  • Model View Controller (MVC)
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  • Struts Tutorial - Struts Setup- First Struts Action class setup
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  • Struts Tutorial - Mutli-click prevention using struts tokens-Prevent Duplicate Submission
  • Logic Iterate Map and List

    JSP


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    Spring


  • Spring Tutorial
  • Introduction to Spring
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  • Introduction to BeanFactory
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  • Spring IOC Setup Step by Step
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  • ApplicationContext
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  • Web Spring MVC framework
  • Developing Your First Spring Web Application
  • Developing Your Second Spring Web Application with Spring Form
  • Developing Your First Spring Web Application with Spring Validation Framework with Code Example
  • Spring integration with Hibernate
  • Hibernate Tutorial Step by Step -- Code Examples

    Criteria Queries : Equal (eq), Not Equal(ne), Less than (lt), Less than or equal(le), greater than (gt),greater than or equal(ge) and Ordering the results The interface org.hibernate.Criteria represents a query against a particular persistent class. The Session is a factory for Criteria instances. In this section it show how to create TABLE and POJO Java class and Mapping with the Query.

    Create TABLE EMPLOYEE.

    Create TABLE EMPLOYEE(
    id number;
    name varchar;
    age number;
    );

    Create Employee.java bean class.

    Hibernate uses the Plain Old Java Objects (POJOs) classes to map to the database table (Emp.java to EMPLOYEE TABLE). We can configure the variables to map to the database column.

    public class Employee {
    private long id;
    private String name;
    private int age;
    public long getId() {
    return id;
    }
    private void setId(long id) {
    this.id = id;
    }
    public String getName() {
    return name;
    }
    public void setName(String name) {
    this.name = name;
    }
    public int getAge() {
    return age;
    }
    private void setAge(int age) {
    this.age = age;
    }
    }


    Employee.hbm.xml - This mapps EMPLOYEE TABLE and Emp.java

    <?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="Employee" table="EMPLOYEE">
    <id name="id" column="id" type="long">
    <generator class="increment"/> // This generates the primary key
    </id>
    <property name="name" column="name"/>
    <property name="age" column="age" type="int"/>
    </class>
    </hibernate-mapping>

    Equal (eq)

    Equal (eq) : Is used to check equal in the query.

    // SELECT * FROM EMPLOYEE WHERE AGE=24; ----SQL COMMAND
    criteria query for above query is :
    List empList = session.createCriteria(Employee.class).add( Restrictions.eq("age", new Integer(24) ) ).list();

    NotEqual (ne)

    NotEqual (ne) : Is used to check not equal in the query.

    // SELECT * FROM EMPLOYEE WHERE AGE !=24; ----SQL COMMAND
    // Not Equal in hibernate criteria criteria query for above query is :
    List empList = session.createCriteria(Employee.class).add( Restrictions.ne("age", new Integer(24) ) ).list();

    Less than (lt)

    Less than (lt) : Is used to check less than in the query.

    // SELECT * FROM EMPLOYEE WHERE AGE < 24; ----SQL COMMAND
    // Not Equal in hibernate criteria criteria query for above query is :
    List empList = session.createCriteria(Employee.class).add( Restrictions.lt("age", new Integer(24) ) ).list();

    Less than or equal(le)

    Less than or equal(le) : Is used to check less than or equal in the query.

    // SELECT * FROM EMPLOYEE WHERE AGE <= 24; ----SQL COMMAND
    // Not Equal in hibernate criteria criteria query for above query is :
    List empList = session.createCriteria(Employee.class).add( Restrictions.le("age", new Integer(24) ) ).list();

    Greater than (gt)

    Greater than (gt) : Is used to check greater than in the query.

    // SELECT * FROM EMPLOYEE WHERE AGE > 24; ----SQL COMMAND
    // Not Equal in hibernate criteria criteria query for above query is :
    List empList = session.createCriteria(Employee.class).add( Restrictions.gt("age", new Integer(24) ) ).list();

    Greater than or equal (gt)

    Greater than or equal (gt) : Is used to check greater than or equal in the query.

    // SELECT * FROM EMPLOYEE WHERE AGE >= 24; ----SQL COMMAND
    // Not Equal in hibernate criteria criteria query for above query is :
    List empList = session.createCriteria(Employee.class).add( Restrictions.ge("age", new Integer(24) ) ).list();

    Ordering the results

    // SELECT * FROM EMPLOYEE WHERE AGE=24 ORDER BY NAME DESC; ----SQL COMMAND
    criteria query for above query is :
    List empList = session.createCriteria(Employee.class). add( Restrictions.eq("age", new Integer(24) ) ).addOrder( Order.desc("name") ).list();

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