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S2Hibernate makes it easier to use JTA and ConnectionPool supported by Seasar2 with Hibernate. S2Hibernate will automatically manage Session so developers will not have to explicitly open and close Session and explicitly manage transactions. Sessions are maintained through JTA transaction and flushed and closed when the transaction ends. RequirementsS2Hibernate requires the following software:
SetupFollows the steps below to setup S2Hibernate to use on Eclipse:
All jar files necessary to use S2Hibernate are in s2hibernate/lib folder.
Hibernate offers many implementations of connection pool and cache which may not be include in S2Hibernate. To use Hibernate features not included with S2Hibernate, download necessary software separately from the Hibernate site.
UsageA class that needs to use Hibernate needs to define S2SessionFactory type field and retrieve implementation class (S2SessionFactoryImpl) through constructor or through deployment. Then, Hibernate functions may be used by calling S2SessionFactory.getSession() method and obtaining a S2Session object, which is a wrapper to Hibernate Session object. Methods supported by Hibernate Session object may be called through this S2Session. ExampleEmployee.java
package examples.hibernate.entity;
import java.io.Serializable;
public class Employee implements Serializable {
private long empno;
private String ename;
private String job;
private Short mgr;
private java.util.Date hiredate;
private Float sal;
private Float comm;
private short deptno;
public Employee(long empno, java.lang.String ename, java.lang.String job,
Short mgr, java.util.Date hiredate, Float sal, Float comm, short deptno) {
this.empno = empno;
this.ename = ename;
this.job = job;
this.mgr = mgr;
this.hiredate = hiredate;
this.sal = sal;
this.comm = comm;
this.deptno = deptno;
}
public Employee() {
}
public Employee(long empno) {
this.empno = empno;
}
public long getEmpno() {
return this.empno;
}
public void setEmpno(long empno) {
this.empno = empno;
}
public java.lang.String getEname() {
return this.ename;
}
public void setEname(java.lang.String ename) {
this.ename = ename;
}
public java.lang.String getJob() {
return this.job;
}
public void setJob(java.lang.String job) {
this.job = job;
}
public Short getMgr() {
return this.mgr;
}
public void setMgr(Short mgr) {
this.mgr = mgr;
}
public java.util.Date getHiredate() {
return this.hiredate;
}
public void setHiredate(java.util.Date hiredate) {
this.hiredate = hiredate;
}
public Float getSal() {
return this.sal;
}
public void setSal(Float sal) {
this.sal = sal;
}
public Float getComm() {
return this.comm;
}
public void setComm(Float comm) {
this.comm = comm;
}
public short getDeptno() {
return this.deptno;
}
public void setDeptno(short deptno) {
this.deptno = deptno;
}
public boolean equals(Object other) {
if ( !(other instanceof Employee) ) return false;
Employee castOther = (Employee) other;
return this.getEmpno() == castOther.getEmpno();
}
public int hashCode() {
return (int) this.getEmpno();
}
}
Employee.hbm.xml<hibernate-mapping> EmployeeDao.javapackage examples.hibernate.dao;
import examples.hibernate.entity.Employee;
public interface EmployeeDao {
public Employee getEmployee(int empno);
}
EmployeeDaoImpl.java
package examples.hibernate.dao;
import java.util.List;
import net.sf.hibernate.Hibernate;
import org.seasar.hibernate.S2SessionFactory;
import examples.hibernate.entity.Employee;
public class EmployeeDaoImpl implements EmployeeDao {
private static final String HQL = "from Employee where empno = ?";
private S2SessionFactory sessionFactory_;
public EmployeeDaoImpl(S2SessionFactory sessionFactory) {
sessionFactory_ = sessionFactory;
}
public Employee getEmployee(int empno) {
List result = sessionFactory_.getSession().find(
HQL, new Integer(empno), Hibernate.INTEGER);
if (result.size() > 0) {
return (Employee) result.get(0);
} else {
return null;
}
}
}
EmployeeService.java
package examples.hibernate.service;
import examples.hibernate.entity.Employee;
public interface EmployeeService {
public Employee getEmployee(int empno);
}
EmployeeServiceImpl.java
package examples.hibernate.service;
import examples.hibernate.dao.EmployeeDao;
import examples.hibernate.entity.Employee;
public class EmployeeServiceImpl implements EmployeeService {
private EmployeeDao employeeDao_;
public EmployeeServiceImpl(EmployeeDao employeeDao) {
employeeDao_ = employeeDao;
}
public Employee getEmployee(int empno) {
return employeeDao_.getEmployee(empno);
}
}
Employee.dicon<components> EmployeeClient.java
package examples.hibernate.client;
import org.seasar.framework.container.S2Container;
import org.seasar.framework.container.factory.S2ContainerFactory;
import examples.hibernate.service.EmployeeService;
public class EmployeeClient {
private static final String PATH =
"examples/hibernate/client/Employee.dicon";
public static void main(String[] args) {
S2Container container = S2ContainerFactory.create(PATH);
container.init();
try {
EmployeeService service =
(EmployeeService) container.getComponent(EmployeeService.class);
System.out.println(service.getEmployee(7788).getEname());
} finally {
container.destroy();
}
}
}
ResultDEBUG 2004-04-07 18:53:52,511 [main] transaction started |
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