| |
Struts Tutorials:
Struts2 Tag CheckBoxList
, Checkbox, Iterator, IF
Struts2 Tag Library Example
Struts2 Tiles Example
Struts2 Tiles I18N Example
Struts2 Questions
Struts Tiles I18N Example
Struts Eclipse MVC
Struts2 Tags
Struts2 Example and Tutorial
Struts MVC
Struts2 Validation
Hibernate Tutorials:
Hibernate Case Study
Class Hierarchy Persist Example
Using Hibernate Interceptor
Hibernate Questions with Answer
Hibernate Many-to-Many Mapping Example
Hibernate one-to-many Mapping Example
Hibernate and ORM tools
Spring Hibernate Example
Hibernate SessionFactory Example
Hibernate Mapping Class Hierarchy
Hibernate Questions
Hibernate SessionFactory Questions
Spring Hibernate Example:
Spring Hibernate Case Study
Written By : Amit
Title :
Interview Questions
Description :
On Hibernate
More...
|
Written By : Amit
Title :
mapping class hierarchy table per subclass
Description :
Example
More...
|
Written By : Amit
Title :
ways create Hibernate SessionFactory
Description :
Example
More...
|
Written By : Amit
Title :
Spring Hibernate Integration example
Description :
Example
More...
|
Written By : Amit
Title :
ORM Hibernate Best FIT
Description :
Discussion
More...
|
Written By : Amit
Title :
One to Many mapping example
Description :
Code
More...
|
| Hibernate Criteria, Hibernate Filter, Hibernate, Example, Code, Tutorial, Article
Author : ISHTEK
Date (Year/Month/Date): 2009-06-08
Hibernate Criteria and Hibernate Filter Example Explained : | | Hibernate Query and Hibernate Criteria demo with example code
By just extending an example that was already on display in this site,
I just tried to add some Hibernate Filter and Hibernate Criteria
features provided by Hibernate Framework.
My Software environment for this example:
1. Eclipse 3.2
2. JDK 1.5
3. Hibernate 3.2
And I tried to see ways of using both or one of these two ways of
putting where condition to any SQL that is ultimately executed at
database level.
In order to use Hibernate Filter functionality, one has to define
the Filter in HBM descriptor XML file, within <filter-def> Tag.
This Filter-def tag can be defined at the class Tag level or within the
dependent or related SET/BAG collection tag (in case of one to many
type of mapping). So the existing DeptsEmployee.HBM.XML file will
be having entries for Filter-Def, Filter-Param and Filter Tags, as
follows:
DeptsEmployee.HBM.XML
<?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 package="demo">
<class name="Dept" table="dept">
<id name="deptId" column="dept_id">
<generator class="assigned"/>
</id>
<property name="deptName" column="dept_name" type="java.lang.String"/>
<set name="employees" table="employee" cascade="persist,delete">
<key column="dept_id" />
<one-to-many class="Employee"/>
</set>
</class>
<class name="Employee" table="employee">
<id name="employeeId" column="employee_id">
<generator class="assigned"/>
</id>
<property name="employeeName" column="employee_name" type="java.lang.String"/>
<one-to-one name="dept" class="Dept" />
<filter name="listStartsWithCapitalT" condition="employee_name like :employeeName1"/>
</class>
<filter-def name="listStartsWithCapitalT">
<filter-param name="employeeName1" type="string"/>
</filter-def>
</hibernate-mapping>
|
Remaining files of this example can be used from the following link,
http://www.interview-questions-tips-forum.net/index.php/Hibernate-Tutorial/One-to-Many-mapping-example/Code
as I have just used files from that Page for rapidly setting up
environment for one to Many Hibernate mapping example with Hibernate Filter
and Hibernate Criteria and Hibernate Query.
List of files includes:
Dept.java
Employee.java
hibernate.cfg.xml
As the above HBM XML file shows, filter-def has a filter-param with a name and
type attribute. This filter-def name attribute will be used in filter Tag in
the class or set tags etc. Tag filter-param name attribute will be used
with a ":" prefix, as the place holder in the where criteria expression,
whose value is to be passed from the Client code.
<filter name="listStartsWithCapitalT" condition="employee_name like :employeeName1"/>
Now we can go through the Client code, showing ways to use Hibernate Filter
with Hibernate criteria. Before using any Hibernate Filter, it has to be
enabled for the Hibernate Session that is to be used for executing the
Query or Criteria.
Client.java
/**
* This source is provided as is, without any warranty
* and /or guaranty of any kind.
* Copyright (C) 2008, ISHTIAK, All Rights Reserved.
* You can use it for Personal Learning purpose only.
* E-mail: usingframeworks@gmail.com
*/
package demo;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Restrictions;
public class Client {
// Hibernate SessionFactory
SessionFactory sessionFactory;
public Client() {
//Hibernate Configuration
Configuration conf = new Configuration();
//Loading configuration properties file
//and building Hibernate SessionFactory.
sessionFactory =
conf.configure("hibernate.cfg.xml")
.buildSessionFactory();
if(sessionFactory != null) {
Session session = sessionFactory.getCurrentSession();
Transaction trans = session.getTransaction();
trans.begin();
session.enableFilter("listStartsWithCapitalT");
Criteria criteria = session.createCriteria(Employee.class);
session.getEnabledFilter("listStartsWithCapitalT")
.setParameter("employeeName1", "%test%");
criteria.add(Restrictions.like("employeeName", "%test1"));
List list = criteria.list();
System.out.println(list.size());
trans.commit();
}
}
/**
* Client main method
* @param args
*/
public static void main(String[] args) {
new Client();
}
}
|
As shown in the above Client code, we have used both Filter and
Hibernate Criteria with Restrictions to add another filter criteria
So following is the final SQL that is getting printed in screen output
/ console as
(Auto generated by Hibernate, just for reference)
select this_.employee_id as employee1_1_1_, this_.employee_name as
employee2_1_1_, dept2_.dept_id as dept1_0_0_, dept2_.dept_name as dept2_0_0_
from employee this_ left outer join dept dept2_ on
this_.employee_id=dept2_.dept_id where this_.employee_name like ? and
this_.employee_name like ?
|
As the section in bold (above) shows that we have enabled the filter criteria
as defined in HBM file, as well as the Client code using Hibernate
Restrictions feature to add LIKE function for the employee name
like filter criteria.
 | Author of this article/writeup has expressed his/her willingness |
to help or guide users with any technical difficulties he/she faces
while working with the example code environment setting up, running
and resolving any such exception raised during compile or at runtime.
You may ask for any technical doubt or seek technical help related to
this article by using following form to reach for technical help
from the Author for FREE.
This article's Author shall be reading your request and responding
within reasonable time (no resolution timeframe defined as such).
|
|
| | Replied By ->
Amit | Can you provide a sample example on using Outer Join fetch
, using Hibernate Filter??
For example, select on all employees whose salary is greater
than some amount and employee's department is having listed in
some special benifit or allowance criterias...
So we have here Employee table and Allowance_Criteria and
Department tables.
Employee table has a department_id column and Allowance_criteria table has also department_id column,
where
department_id are foreign key to the Department table(department_id primary key).
so while selecting for employees records for some particular
salary, one has to join department_id in employee and
Allowance_criteria tables as well..
Can you please help to comeup with some example code on this
example requirement??
Thanks in advance.
|
| | |
| |
|
|
<- requires login
