, mapping- ConnectionFactory. , hibernate, autoReconnect=true, , , .
/* # 8: mapping :
ConnectionFactory.java */
package com.hib;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.MappingException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
import java.util.Date;
public class ConnectionFactory {
public static long timer = 0;
public static SessionFactory sessionFactory = null;
public static void initConnectionFactory() {
Date dt = new Date();
timer = dt.getTime();
try {
// mapping-
Configuration cfg = new Configuration().addClass(Student. class).addClass(Course. class);
//
sessionFactory = cfg.buildSessionFactory();
} catch (MappingException e) {
System.err.print(e);
} catch (HibernateException e) {
System.err.print(e);
destroy();
}
}
public static Session getOrInitSession() {
try {
Date curDate = new Date();
long curTime = curDate.getTime();
long tenminutes = 10 * 60 * 1000;
if (curTime - timer > tenminutes){
destroy();
}
else {
curDate = new Date();
timer = curDate.getTime();
}
if (sessionFactory == null) {
initConnectionFactory();
}
return sessionFactory.openSession();
} catch (HibernateException e) {
System.err.print(e);
destroy();
return null;
}
}
public static void destroy() {
timer = 0;
try {
// , ..
sessionFactory.close();
} catch (Exception e) {
e.printStackTrace();
}
sessionFactory = null;
}
}
. 10 , . . Hibernate , hbm.xml , .
, c Hibernate, JDBC MySQL MySQL.
.
/* # 9: mapping : StudentDAO.java */
package com.hib;
import net.sf.hibernate.*;
public class StudentDAO {
//
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public static Boolean studentExists(String login) {
Session session =
ConnectionFactory.getOrInitSession();
Student _student = null;
try {
//
Query query =
session.createQuery(
" from Student a where a.login =:login ");
query.setParameter("login", login);
/* . , */
_student = (Student) query.uniqueResult();
} catch (HibernateException e) {
e.printStackTrace();
ConnectionFactory.destroy();
} finally {
if (session!= null) {
try {
session.close();
} catch (HibernateException e) {
e.printStackTrace();
ConnectionFactory.destroy();
}
}
}
if (_student!= null) {
return new Boolean(true);
} else {
return null;
}
}
public static Student getStudent(String login,
String password) {
Session session =
ConnectionFactory.getOrInitSession();
Student _student = null;
try {
Query query =
session.createQuery(
"from Student a where a.login =:login");
query.setParameter("login", login);
_student = (Student) query.uniqueResult();
} catch (HibernateException e) {
e.printStackTrace();
ConnectionFactory.destroy();
} finally {
if (session!= null) {
try {
session.close();
} catch (HibernateException e) {
e.printStackTrace();
ConnectionFactory.destroy();
}
}
}
if (_student!= null) {
if (password.equals(_student.getPassword())) {
return _student;
} else
return null;
} else
return null;
}
//
// id mapping
public static void updateStudent(Student _student) {
Session session =
ConnectionFactory.getOrInitSession();
try {
Transaction tx = null;
tx = session.beginTransaction();
session.update(_student);
tx.commit();
} catch (HibernateException e) {
e.printStackTrace();
tx.rollback();
ConnectionFactory.destroy();
} finally {
if (session!= null) {
try {
session.close();
} catch (Exception e) {
e.printStackTrace();
ConnectionFactory.destroy();
}
}
}
}
//
// native mapping
public static Boolean addStudent(Student _student) {
Session session =
ConnectionFactory.getOrInitSession();
try {
Transaction tx = null;
tx = session.beginTransaction();
session.save(_student);
tx.commit();
} catch (HibernateException e) {
e.printStackTrace();
tx.rollback();
ConnectionFactory.destroy();
return null;
} finally {
if (session!= null) {
try {
session.close();
} catch (Exception e) {
e.printStackTrace();
ConnectionFactory.destroy();
return null;
}
}
}
return new Boolean(true);
}
//
public static void deleteStudent(Student _student) {
Session session =
ConnectionFactory.getOrInitSession();
try {
Transaction tx = null;
tx = session.beginTransaction();
session.delete(_student);
tx.commit();
} catch (HibernateException e) {
e.printStackTrace();
tx.rollback();
ConnectionFactory.destroy();
} finally {
if (session!= null) {
try {
session.close();
} catch (Exception e) {
e.printStackTrace();
ConnectionFactory.destroy();
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}
}
}
}
}
SessionFactory , . ,
, SessionFactory, , , .
Session :
Session , Session per request .
3.1, Hibernate hibernate.current_session_context_class, , " jta ", " thread " "managed",
, org.hibernate.context.CurrentSessionContext / .
, SessionFactory.getCurrentSession(), , .
<property name= "current_session_context_class">thread </property> deleteStudent() .
public static void deleteStudent(Student _student) {
Session session =
ConnectionFatory.sessionFactory
.getCurrentSession();
try {
Transaction tx = null;
tx = session.beginTransaction();
session.delete(_student);
tx.commit();
} catch (HibernateException e) {
e.printStackTrace();
tx.rollback();
}
}
org.hibernate.context.ThreadLocalSessionContext, , beginTransaction() ,
commit() rollback().
- Apache Ant
- Apache Ant, , :
+lib
<Hibernate and third-party libraries>
+src
<All source files and packages including hbm files>
hibernate.cfg.xml
build.xml
build.xml Ant. :
<project name="hibernate-tutorial" default="compile">
<property name="sourcedir" value="${basedir}/src"/>
<property name="targetdir" value="${basedir}/bin"/>
<property name="librarydir" value="${basedir}/lib"/>
<path id="libraries">
<fileset dir="${librarydir}">
<include name="*.jar"/>
</fileset>
</path>
<target name="clean">
<delete dir="${targetdir}"/>
<mkdir dir="${targetdir}"/>
</target>
<target name="compile" depends=
"clean, copy-resources">
<javac srcdir="${sourcedir}"
destdir="${targetdir}"
classpathref="libraries"/>
</target>
<target name="copy-resources">
<copy todir="${targetdir}">
<fileset dir="${sourcedir}">
<exclude name="**/*.java"/>
</fileset>
</copy>
</target>
</project>
ant, . , build.xml :
<target name="run" depends="compile">
<java fork="true" classname="ClassName"
classpathref="libraries">
<classpath path="${targetdir}"/>
</java>
</target>
ClassName , ( main, ). , ant run.
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STRUTS
Struts 2000 . . (Craig R. McClanahan) , Model/View/Controller. 2001 . Struts 1.0. Struts Jakarta, Apache Software Foundation. Jakarta Struts Web- Java Servlet and JSP.
