What is Hibernate – Hibernate Introduction

In this tutorial am going to explain, why Hibernate came into picture though we have JDBC for connecting to the database, and what is this hibernate frame work first let us see what are the draw backs of JDBC…

Mapping And Configuration Files In Hibernate

Mapping and Configuration are very familiar keywords we used to here in the hibernate, every hibernate program must need these 2 xml files. Mapping: Mapping file is the heart of hibernate application. Every ORM tool needs this mapping, mapping is…

Main Advantage And Disadvantages Of Hibernates

Let us see what are the advantages and disadvantages of hibernate framework Advantages of hibernates: Hibernate supports Inheritance, Associations, Collections In hibernate if we save the derived class object,  then its base class object will also be stored into the…

Simple Hibernate Application Requirements

Any hibernate application, for example consider even first hello world program must always contains 4 files totally. POJO class Mapping XML Configuration XML One java file to write our logic Actually these are the minimum requirement to run any…

Where To Download, How To Install Hibernate

Let us see what are the jar files we need to download to work with hibernate framework, and how to install. Working with the framework software is nothing but, adding the .jar(s) files provided by that framework to our…

Hibernate Hello World Program in Eclipse

Mates, now am going to show like how to execute the previous hibernate program in Eclipse IDE to make our world little easy. You might be fresher or not aware of executing java programs in the eclipse what ever…

Example On Hibernate Select Query

This is an example for loading the object from the database remember in the hibernate loading 1 object from the database means applying select command (select * from _____) for fetching one complete record from the database. Files required…

Example On Hibernate Delete Query

This is the program to Delete a row (Object) from the database, just like using delete query in the jdbc program.. Files required to execute this program.. Product.java (My POJO class) Product.hbm.xml (Xml mapping file ) hibernate.cfg.xml (Xml configuration…

Example On Hibernate Update Query

This is the program to update an object (1 complete row) in the database, which is already persisted in the database, then we have the following two approaches… Approach 1 Load that object from the database, and modify its…

Importance Of Wrapper And Primitive Types In Hibernate

Now we are going to see the main advantages of wrapper types over primitives in the hibernates, will see with an example Files required to execute this program.. Product.java (My POJO class) Product.hbm.xml  (Xml mapping file ) hibernate.cfg.xml  (Xml…

Hibernate Lifecycle Of pojo Class Objects

Actually our POJO class object having 3 states like… Transient state Persistent state Detached state   Transient & Persistent states: When ever an object of a pojo class is created then it will be in the Transient state When…

Hibernate Converting Object From Detached to Persistent state

Now we will see, how to convert the detached state object into Persistent state again…, As usual hibernate configuration, mapping XML are same and pojo class too, if you want just refer Hello World Program ClientLogicProgram.java: import org.hibernate.*; import…

Inheritance Mapping In Hibernate – Introduction

Compared to JDBC we have one main advantage in hibernate, which is hibernate inheritance.  Suppose if we have base and derived classes, now if we save derived(sub) class object, base class object will also be stored into the database….

Hibernate Inheritance: Table Per Class Hierarchy

Here is the explanation and one example on hibernate table per class hierarchy, consider we have base class named Payment and 2 derived classes like CreditCard, Cheque If we save the derived class object like CreditCard or Cheque then…

Hibernate Inheritance: Table Per subClass Hierarchy

This is also just like previous example, but some changes are there, in table per class hierarchy all the data was saved in a single table but here, x number of classes = x number of tables in the…

Hibernate Inheritance: Table Per Concrete Class Hierarchy

Something like previous example but the changes are at mapping file only, and one more thing is.. x number of derived classes = x number of tables in the database Once we save the derived class object, then derived…

Example On Composite Primary Keys In Hibernate

Composite primary keys means having more than one primary key, let us see few points on this concept If the table has a primary key then in the hibernate mapping file we need to configure that column by using…

Composite Primary Key In Hibernate With Select Query

Composite primary keys means having more than one primary key right..? Example On this__ Files required…. Product.java (Pojo) ForOurLogic4Load.java (for our logic) hibernate.cfg.xml Product.hbm.xml All files are same like previous program, but ForOurLogic4Load.java is the new file for loading…

Generators <generator> In Hibernate

<generator /> is one of main element we are using in the hibernate framework ,  let us see the concept behind this generators.   Up to now in our hibernate mapping file, we used to write…

Part 1 Hibernate Query Language Introduction

So far we done the operations on single object (single row), here we will see modifications, updates on multiple rows of data (multiple objects) at a time.  In hibernate we can perform the operations on a single row (or)…

Part 2 Hibernate Query Language, Executing HQL Commands

Let us see, how to execute HQL commands.. Procedure To Execute HQL Command: If we want to execute execute an HQL query on a database, we need to create a query object ” Query ” is an interface given…

Part 3 HQL, Different Ways Of Executing HQL Commands

We can execute our HQL command in 3 ways,  like by selecting total object, partial object (more than one column), partial object (with single column).  Let us see..   Different Ways Of Executing HQL Case 1: [ Selecting Complete…

Part 4 Hibernate Query Language, Using HQL Select Query

Let us see the program on HQL select command,  which is going to cover complete object, partial object (More than one column), partial object (Single column) here are the required files…. Product.java (POJO class) Product.hbm.xml  (Xml mapping file )…

Part 5 Hibernate Query Language, Passing Runtime Values

Now we will see, how to pass the values at time time while using the HQL  select query, actually same concept for 3 cases. Required files… Product.java (POJO class) Product.hbm.xml  (Xml mapping file ) hibernate.cfg.xml  (Xml configuration file) ForOurLogic.java…

Part 6 Hibernate Query Language, HQL Update,Delete Queries

so far we have been executed the programs on Hibernate Query Language (HQL) select only, now we will see the DML operations in HQL like insert, delete, update., you know some thing..? this delete, update query’s are something similar…

Part 7 Hibernate Query Language Insert Query

Now we will see how to use HQL insert query, as i told earlier its little different then remaining query’s, actually the thing is….. HQL supports only the INSERT INTO……… SELECT……… ; there is no chance to write INSERT…

Criteria Query, Hibernate Criteria Query Introduction

Unlike HQL, Criteria is only for selecting the data from the database, that to we can select complete objects only not partial objects, in fact by combining criteria and projections concept we can select partial objects too we will…

Example On Hibernate Criteria Query

Let us see an example program on hibernate criteria query, files required…. Product.java(POJO class) Product.hbm.xml hibernate.cfg.xml ForOurLogic.java (For writing our business logic) Product.java package str; public class Product{ private int productId; private String proName; private double price; public void…

Hibernate Criteria, Adding Conditions To Criteria

If we want to add some sorting order for the objects, before the objects are going to store in list object then we need to add an Order class object to the Criteria class object by calling addOrder() method..,…

Hibernate Projections Introduction

So far in criteria, we are able to load complete object right….! let us see how to load the partial objects while working with criteria.  The projections concept is introduced in hibernate 3.0 and mainly we can do the…

Hibernate Projections, Example On Hibernate Projections

Now we will see how to use this criteria to select partial objects from the database with the help of projections, (Remember, We cant select partial objects in criteria with out projections support) files required… Product.java(POJO class) Product.hbm.xml hibernate.cfg.xml…

Example On Hibernate Criteria With Multiple Projections

If we want to load partial object, with multiple columns using criteria then we need to create the ProjectionList with the multiple properties and then we need to add that ProjectionList to the criteria files required… Product.java(POJO class) Product.hbm.xml…

Difference between HQL and Criteria Query in Hibernate

Let us see the main differences between HQL and Criteria Query HQL is to perform both select and non-select operations on the data,  but Criteria is only for selecting the data, we cannot perform non-select operations using criteria HQL…

Hibernate Native SQL Query Example

Native SQL is another technique of performing bulk operations on the data using hibernate By using Native SQL, we can perform both select, non-select operations on the data In face Native SQL means using the direct SQL command specific to…

Example On Hibernate Pagination With Servlet In Eclipse

Let us see an example on hibernate pagination with servlet.. when response for request is too large then instead of displaying all records at a time on browser  we can…

How To Enable Second Level Caching In Hibernate

First level cache will be enabled by default, but for enable second level cache we need to follow some settings, let us see few points regarding this..   Second level cache was introduced in hibernate 3.0 When ever we…

Hibernate Hello World Program With Annotations

Folks we will see one simple program with hibernate annotations, let us take inserting a record into the database application.  And remember in the annotations no need to write mapping xml, hope you remember…

Hibernate One To Many Annotation Example

Let us see an example on one to many annotations mapping… Files required.. Customers.java Vendor.java ForOurLogic.java hibernate.cfg.xml Customers.java package str; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name = “Customers”) public class Customers{ @Id @Column(name = “custid”)…

Hibernate Many To One Annotation Example

Will find the example on hibernate many to one mapping using annotations Files required… Customers.java Vendor.java hibernate.cfg.xml ForOurLogic.java Customers.java package str; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; @Entity @Table(name = “Customers”)…

Hibernate Many To Many Mapping Using Annotations

Let us see the example on many to many using annotations Files required…. Categories.java Item.java hibernate.cfg.xml ForOurLogic.java Categories.java package str; import java.util.Set; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; import javax.persistence.Table; @Entity…

Hibernate One To One Mapping Using Annotations

Let us see the example on one to one mapping using annotations.. Files required… Address.java Student.java hibernate.cfg.xml ClientForSave.java Address.java package str; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OneToOne; import javax.persistence.Table; @Entity @Table(name=”Address”) public class…

Difference Between Merge And Update Methods In Hibernate

Both update() and merge() methods in hibernate are used to convert the object which is in detached state into persistence state.  But there is little difference.  Let us see which method will be used in what situation. Let Us…