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Hibernate

  • Advantage of Hibernate over JDBC
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  • 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

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  • Struts Tutorial - Mutli-click prevention using struts tokens-Prevent Duplicate Submission
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  • Spring Tutorial
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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 The interface org.hibernate.Criteria represents a query against a particular persistent class. The Session is a factory for Criteria instances.

    Criteria : Select * from Employee.

    Criteria criemp = session.createCriteria(Employee.class);
    List emplist = criemp.list();

    Restrictions to narrow result set

    The class org.hibernate.criterion.Restrictions used to narrow result set.

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

    Ordering the results

    // SELECT * FROM EMPLOYEE WHERE AGE=24 ORDER BY EMP_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("empname") ).list();

    Associations

    // SELECT e.name FROM EMPLOYEE e , address a where e.address_id=a.address_id and a.country='US'; ----SQL COMMAND
    criteria query for above query is :
    List empList = session.createCriteria(Employee.class).createAlias("address","add"). add( Restrictions.eq("add.country", "US" ) ).list();

    Example queries

    The class org.hibernate.criterion.Example allows you to construct a query criterion from a given instance.

    // SELECT * FROM EMPLOYEE e WHERE e.dept='IT'; ----SQL COMMAND
    criteria query for above query is :
    Employee emp = new Employee();
    cat.setDept('IT');
    List emplist = session.createCriteria(Employee.class)
    .add( Example.create(emp) )
    .list();

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