Latest Answer: Add the hibernate related jar files into lib
directory of any web application using net
beans.http://www.netbeans.org/kb/41/hibernate.html ...
Read Answers (1) | Asked by : Hem
Latest Answer: cascade specifies which operations should be casecaded from the parent object to the associated
object. The meaningfull values would be persist , merge, delete, save_update,
evict , replicate, lock , refresh , all , delete_orphan. ...
Read Answers (4) | Asked by : ravi
Latest Answer: Hibernate is ORM tool used for data
persistency.Spring is a framework for enterprise applications with
default APIs for presentation, middle tiers and presistence layers and allows
to integrate with various presentations, middle tier and presistence APIs
...
Read Answers (1) | Asked by : HARSHAL
Latest Answer: Preserving the data inside a database is
database persistence. Persistence is once of the fundamental concepts of
application developement. There are many alternatives to implement persistence.
Object/relational mapping (ORM) is the technique that Hibernate ...
Read Answers (2) | Asked by : donna
Latest Answer: Its is one of the most popular ORM technology available to date
in the market.Java bean is a simple resuble component. There is no persistency
on bean hibernate provides the service to make the bean persistent so that we
can make use of it. In hibernate ...
Read Answers (4) | Asked by : enjoy
Latest Answer: Hibernate 3.2 ...
Read Answers (2) | Asked by : enjoy
Q1: What is the
difference between Hibernate and EJB 2.1? Q2: Which one, among EJB 2.1 and
Hibernate, is better?Explain with reason.Q3: When to use EJB 2.1 and when to
use Hibernate? Explain with scenarios.
Read Answers (2) | Asked by : Kumar
I am using
hibernate.What is the use In Data(POJO) class primary key is sending as an
argument with constructor?
View Question | Asked by : Kotireddy
Latest Answer: Hibernate
Advantages:Productivity:
Improves the productivity by eliminating the JDBC tedious code.
...
Read Answers (8) | Asked by : kounteya
I am new to
Hibernate.So can any one tell me how to develop a application using Hibernate in the Myeclipse .and also please
send me pdf to suddu026@gmail.com.Regards,Sudarshan.
Read Answers (3) | Asked by : Sudarshan..
Latest Answer: Ccreate primary key? Not sure but you can
defined it in the hbm file by specifying the field with the primary column in
the db. ...
Read Answers (5) | Asked by : satyanarayana
Latest Answer: Hibernate has good connection pooling rather
than JDBC. It has has more persistance for OOPs. ...
Read Answers (8) | Asked by : davis
Latest Answer: A component is an object saved as a value, not
as a reference A component can be saved directly without needing to declare
interfaces or identifier properties Required to define an empty constructor
Shared references not supported ...
Read Answers (3) | Asked by : sunils
Latest Answer: Hibernate allows the application developer to
concentrate on the business logic instead of writing complex SQLs. Aprt from
this hibernate would take care of the database connections and managing
connection pools. Hibernate can be used with managed (websphere, ...
Read Answers (6) | Asked by : sunils
How do you handle the
situation where persistence class attribute name is one of the reserved keyword
in database; e.g. user ? Will this cause any issue while hibenrate executes SQL
statements behind the scene?
Read Answers (4) | Asked by : sunils
Latest Answer: A component is a contained object that is
persisted as a value type ,not an entity reference.eg)public class
person{private Name name;public Name getName(){ return name;}public void
setName(Name name){this.name=name;}.....}public class Name{chat initial;String
...
Read Answers (1) | Asked by : sunils
Latest Answer: first things first ..i have just seen ppl
venting thier personal grudge over java / jpa or whatever over this forum.suns
official sacceptence that jpa is a failure. please lets keep it out.as for the
answer , JPA is a specification , its nt a frame work ...
Read Answers (5) | Asked by : sunils
Latest Answer: Lazy loading is the responsibility is that to
load the objects for its parentIn mapping file, if you want to load the child
objects while loading the parent it will wont load coz by default load = trueso
you have to specify lazy = falsehere child ...
Read Answers (6) | Asked by : j2eeinterviewee
What are the
types of inheritence models and describe how they work like vertical
inheritence and horizontal
Read Answers (3) | Asked by : James
Complete Hibernate 3.0 Tutorial
This tutorial provide step by step instructions on using
Hibernate 3.0. Hibernate
is popular open source object relational mapping tool for Java platform. It
provides powerful, ultra-high performance object/relational persistence and
query service for Java. Hibernate lets you develop persistent classes following
common Java idiom - including association, inheritance,
polymorphism, composition and the Java collections framework. The Hibernate
Query Language, designed as a "minimal" object-oriented
extension to SQL, provides an elegant bridge between the object and relational
worlds. Hibernate also allows you to express queries using native SQL or
Java-based Criteria and Example queries. Hibernate is now the most popular
object/relational mapping solution for Java. Download Source Code
Example of tutorial- Introduction
to Hibernate 3.0
This lesson introduces you with the Hibernate 3.0 and provides the detailed features of the Hibernate 3.0
- Hibernate
Architecture
In this lesson you will learn the architecture of Hibernate.
- First
Hibernate Application
This section describes you how to develop sample Hibernate Application. Also see Hibernate Getting Started Tutorial.
- Running
the Example in Eclipse
This section shows you how to run the example in the Eclipse.
- Understanding
Hibernate O/R Mapping
This section describes the each component of the hibernate mapping file..
- Understanding
Hibernate <generator> element
In this lesson you will learn about hibernate <generator> method in detail. Hibernate generator element generates the primary key for new record.
- Using
Hibernate <generator> to generate id incrementally
In this lesson I will show you how to write running program to demonstrate it.
- Hibernate
Update Query
In this tutorial we will show how to update a row with new information by retrieving data from the underlying database using the hibernate. Lets first write a java class to update a row to the database.
- Hibernate
Delete Query
In this lesson we will show how to delete rows from the underlying database using the hibernate. Lets first write a java class to delete a row from the database.
Hibernate Query Language - Introduction
to Hibernate Query Language
In this lesson you will learn about Hibernate Query Language and its features.
- Preparing
table for HQL Examples
In this lesson you will create insurance table and populate it with the data for future examples.
- Developing
POJO class
In this lesson we will write the java class and add necessary code in the contact.hbm.xml file.
- HQL
from Clause Example
The from clause is the simplest possible Hibernate Query. In this example you will learn how to use the HQL from clause.
- HQL Select
Clause Example
In this lesson we will write example code to select the data from Insurance table using Hibernate Select Clause.
- Hibernate
Count Query
In this section we will show you, how to use the Count Query. Hibernate supports multiple aggregate functions. when they are used in HQL queries, they return an aggregate value (such as sum, average, and count) calculated from property values of all objects satisfying other query criteria.
- Hibernate
Avg() Function (Aggregate Functions)
In this section, we will show you, how to use the avg() function. Hibernate supports multiple aggregate functions. When they are used in HQL queries, they return an aggregate value ( such as avg(...), sum(...), min(...), max(...) , count(*), count(...), count(distinct ...), count(all...) ) calculated from property values of all objects satisfying other query criteria.
- Hibernate
Max() Function (Aggregate Functions)
In this section, we will show you, how to use the Max() function. Hibernate supports multiple aggregate functions.
- Hibernate
Min() Function (Aggregate Functions)
In this section, we will show you, how to use the Min() function. Hibernate supports multiple aggregate functions.
- HQL
Where Clause Example
Where Clause is used to limit the results returned from database. In this lesson you will learn how to use HQL Where Clause.
- HQL
Group By Clause Example
Group by clause is used to return the aggregate values by grouping on returned component. In this lesson you will learn how to use HQL Group By Clause.
- HQL
Order By Example
Order by clause is used to retrieve the data from database in the sorted order by any property of returned class or components. In this lesson you will learn how to use HQL Order By Clause.
Hibernate Criteria Query - Hibernate
Criteria Query Example
In this lesson you will learn how to use Hibernate Criteria Query.
- Narrowing
the result set
In this lesson you will learn how to use Hibernate Criteria Query to narrow down the result data.
- Hibernate's
Built-in criterion: Between (using Integer)
In this tutorial,, you will learn to use "between" with the Integer class. "Between" when used with the Integer object, It takes three parameters e.g.between("property_name",min_int,max_int).
- Hibernate's
Built-in criterion: Between (using Date)
In this section, you will learn to use "between" i.e.one of the built-in hibernate criterions. Restriction class provides built-in criterion via static factory methods.
26. Hibernate
Criteria Expression (eq)
In this section, you will learn to use the "eq" method. This is one of the most important method that is used to apply
In this section, you will learn to use the "eq" method. This is one of the most important method that is used to apply
an
"equal" constraint to the named property.- Hibernate
Criteria Expression (lt)
In this section, you will learn to use the "lt" method. This is one of the most important method that is used to applya "less than" constraint to the named property.
- Hibernate
Criteria Expression (le)
In this section, you will learn to use the "le" method. This is one of the most important method that is used to applya "less than or equal" constraint to the named property.
- Hibernate
Criteria Expression (gt)
In this section, you will learn to use the "gt" method. This is one of the most important method that is used to apply
- Hibernate
Criteria Expression (ge)
In this section, you will learn to use the "ge" method. This is one of the most important method that is used to apply
- Hibernate
Criteria Expression (and)
In this section, you will learn to use the "and" method. This is one of the most important method that returns the conjunctions of two expressions. You can also build the nested expressions using 'and' and 'or'.
- Hibernate
Criteria Expression (or)
In this section, you will learn to use the "or" method. This is one of the most important method that returns the disjunction of the two expressions. You can also build the nested expressions using 'and' and 'or'.
33. Insert
Data into Database Using Hibernate Native SQL
In this example we will show you how you can use Native SQL with hibernate. You will learn how to use Native to insert data into database. Native SQL is handwritten SQL for all database operations like insert, update, delete and select.
In this example we will show you how you can use Native SQL with hibernate. You will learn how to use Native to insert data into database. Native SQL is handwritten SQL for all database operations like insert, update, delete and select.
- Hibernate
Native SQL Example
Native SQL is handwritten SQL for all database operations like create, update, delete and select. Hibernate Native Query also support stored procedures.
- Associations
and Joins
This section includes a brief introduction about Associations and Joins along with examples.
- Hibernate
Aggregate Functions (Associations and Joins)
This example tries to make understand about the aggregate function of Hibernate with the help of example.
- Hibernate
Subqueries
In this section, you will learn about the subqueries with an appropriate example.
Hibernate Projections Tutorials and Examples - Hibernate
Projections
In this section, you will learn about the hibernate projections with an appropriate example.
- Hibernate
Projections (rowCount or countDistinct)
In this section, you will learn about the hibernate projection with an example. Projection Interface: This is an interface that extends the Serializable.
- Hibernate
Projection Count
In this section, you will learn to hibernate projection count. The example demonstrates the rowCount() method of the projection interface.
- Hibernate
Projection Example (Sum)
In this section, you will learn to hibernate aggregate function like: sum() using hibernate projection.
- Hibernate
How To?
- Hibernate
types
This section gives you description of all the Types that are supported by Hibernate. A Hibernate Type is used to map a Java property type to a JDBC type or types.
- Hibernate
Books
List of many best hibernate books.
In this Hibernate Mapping tutorials series you will learn Hibernate in depth. We will show everything on Hibernate Mappings with running code example.
About Author
Struts Hibernate Integration Tutorial NEW
In this tutorial I will show you how to integrate Struts and Hibernate. After completing this tutorial you will be able to use Hibernate in your Struts project. Download the source code of Struts Hibernate Integration Tutorial.
- Setting
up MySQL Database and table
This section describes how to setup database and populate it with the data. We are using MySQL Database for this tutorial.
- Downloading
Struts, Hibernate and Integrate It
This section explains you to setup the develop workbench for our Struts Hibernate tutorial
- Writing
Hibernate configuration file, POJO class and Tutorial.hbm.xml (Hibernate
mapping class)
In this section we will write required hibernate objects like configuration files and then integrate all the stuffs.
- Developing
Hibernate Struts Plugin
In this section we will write Hibernate Struts Plugin Java code and integrate it with the Struts.
- Writing
Web Client to Search the database using Struts Hibernate Plugin
In this section we will write web client to test struts Plugin. We will be developing a search form to search the tutorials from the table.
- Build
and testing the application
In this section we will build our Struts Hibernate Plugin Application and then test.
Hibernate Annotations - Hibernate
Annotations
Hibernate Annotations examples and tutorials.
- Quick
Hibernate Annotation Tutorial
This tutorial covers only the Annotations part. The reader must have hands on experience before starting this tutorial.
1.What is ORM ?
ORM stands for object/relational mapping. ORM
is the automated persistence of objects in a Java application to the tables in
a relational database.
2.What does ORM consists of ?
An ORM solution consists of the followig four
pieces:
- API for performing basic CRUD operations
- API to express queries refering to classes
- Facilities to specify metadata
- Optimization facilities : dirty checking,lazy associations fetching
3.What are the ORM levels ?
The ORM levels are:
- Pure relational (stored procedure.)
- Light objects mapping (JDBC)
- Medium object mapping
- Full object Mapping (composition,inheritance, polymorphism, persistence by reachability)
4.What is Hibernate?
Hibernate is a pure Java object-relational
mapping (ORM) and persistence framework that allows you to map plain old Java
objects to relational database tables using (XML) configuration files.Its
purpose is to relieve the developer from a significant amount of relational
data persistence-related programming tasks.
5.Why do you need ORM tools like hibernate?
The main advantage of ORM like hibernate is
that it shields developers from messy SQL. Apart from this, ORM provides
following benefits:
- Improved productivity
- High-level object-oriented API
- Less Java code to write
- No SQL to write
- Improved performance
- Sophisticated caching
- Lazy loading
- Eager loading
- Improved maintainability
- A lot less code to write
- Improved portability
- ORM framework generates database-specific SQL for you
6.What Does Hibernate Simplify?
Hibernate simplifies:
- Saving and retrieving your domain objects
- Making database column and table name changes
- Centralizing pre save and post retrieve logic
- Complex joins for retrieving related items
- Schema creation from object model
7.What is the need for Hibernate xml
mapping file?
Hibernate mapping file tells Hibernate which
tables and columns to use to load and store objects. Typical mapping file look
as follows:
8.What are the most common methods of Hibernate configuration?
The most common methods of Hibernate
configuration are:
- Programmatic configuration
- XML
configuration (
hibernate.cfg.xml)
9.What are the important tags of hibernate.cfg.xml?
Following are the important tags of
hibernate.cfg.xml:
10.What are the Core interfaces are of Hibernate framework?
The five core interfaces are used in just
about every Hibernate application. Using these interfaces, you can store and
retrieve persistent objects and control transactions.
- Session interface
- SessionFactory interface
- Configuration interface
- Transaction interface
- Query and Criteria interfaces
11.What role does the Session interface play
in Hibernate?
The Session interface is the primary interface
used by Hibernate applications. It is a single-threaded, short-lived object
representing a conversation between the application and the persistent store.
It allows you to create query objects to retrieve persistent objects.
Session session =
sessionFactory.openSession();
Session interface role:
- 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
12.What role does the SessionFactory interface play in Hibernate?
The application obtains Session instances
from a SessionFactory. There is typically a single SessionFactory for the whole
application—created during application initialization. The SessionFactory
caches generate SQL statements and other mapping metadata that Hibernate uses
at runtime. It also holds cached data that has been read in one unit of work
and may be reused in a future unit of work
SessionFactory
sessionFactory = configuration.buildSessionFactory();
13.What is the general flow of Hibernate
communication with RDBMS?
The general flow of Hibernate communication
with RDBMS is :
- Load the Hibernate configuration file and create configuration object. It will automatically load all hbm mapping files
- Create session factory from configuration object
- Get one session from this session factory
- Create HQL Query
- Execute query to get list containing Java objects
14.What is Hibernate Query Language (HQL)?
Hibernate offers a query language that
embodies a very powerful and flexible mechanism to query, store, update, and
retrieve objects from a database. This language, the Hibernate query Language
(HQL), is an object-oriented extension to SQL.
15.How do you map Java Objects with Database tables?
- First we need to write Java domain objects (beans with setter and getter).
- Write hbm.xml, where we map java class to table and database columns to Java class variables.
Example :
<hibernate-mapping>
<class name="com.test.User" table="user">
<property column="USER_NAME" length="255"
name="userName" not-null="true" type="java.lang.String"/>
<property column="USER_PASSWORD" length="255"
name="userPassword" not-null="true" type="java.lang.String"/>
</class>
</hibernate-mapping>
16.What’s the difference between load() and
get()?
load() vs. get() :-
No comments:
Post a Comment