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Filter in Hibernate with Example? |
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Filter in Hibernate ------
USER ( ID INT, USERNAME VARCHAR, ACTIVATED BOOLEAN) - TABLE public class User { private int id; private String username; private boolean activated; public boolean isActivated() { return activated; } public void setActivated(boolean activated) { this.activated = activated; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } } ----------------------------------------------------------------- <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="User"> <id name="id" type="int"> <generator class="native"/> </id> <property name="username" type="string" length="32"/> <property name="activated" type="boolean"/> <filter name="activatedFilter" condition=":activatedParam = activated"/> </class> <filter-def name="activatedFilter"> <filter-param name="activatedParam" type="boolean"/> </filter-def> </hibernate-mapping> -------------------------------------------------------------------- Save and Fetch using filter example User user1 = new User(); user1.setUsername("name1"); user1.setActivated(false); session.save(user1); User user2 = new User(); user2.setUsername("name2"); user2.setActivated(true); session.save(user2); User user3 = new User(); user3.setUsername("name3"); user3.setActivated(true); session.save(user3); User user4 = new User(); user4.setUsername("name4"); user4.setActivated(false); session.save(user4); All the four user saved to Data Base User Table. Now Fetch the User using Filter.. Filter filter = session.enableFilter("activatedFilter"); filter.setParameter("activatedParam",new Boolean(true)); Query query = session.createQuery("from User"); Iterator results = query.iterate(); while (results.hasNext()) { User user = (User) results.next(); System.out.print(user.getUsername() + " is "); } Guess the Result : name2 name3 Because Filer is filtering ( only true value) data before query execute. |
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