Hibernate 例子

own new list of the employees */ ME.listEmployees(); } /* Method to CREATE an employee in the database */ public Integer addEmployee(String fname, String lname, int salary){ Session session = factory.openSession(); Transaction tx = null; Integer employeeID = null; try{ tx = session.beginTransaction(); Employee employee = new Employee(fname, lname, salary); employeeID = (Integer) session.save(employee); tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } return employeeID; } /* Method to READ all the employees */ public void listEmployees( ){ Session session = factory.openSession(); Transaction tx = null; try{ tx = session.beginTransaction(); List employees = session.createQuery("FROM Employee").list(); for (Iterator iterator = employees.iterator(); iterator.hasNext();){ Employee employee = (Employee) iterator.next(); System.out.print("First Name: " + employee.getFirstName()); System.out.print(" Last Name: " + employee.getLastName()); System.out.println(" Salary: " + employee.getSalary()); } tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } } /* Method to UPDATE salary for an employee */ public void updateEmployee(Integer EmployeeID, int salary ){ Session session = factory.openSession(); Transaction tx = null; try{ tx = session.beginTransaction(); Employee employee = (Employee)session.get(Employee.class, EmployeeID); employee.setSalary( salary ); session.update(employee); tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } } /* Method to DELETE an employee from the records */ public void deleteEmployee(Integer EmployeeID){ Session session = factory.openSession(); Transaction tx = null; try{ tx = session.beginTransaction(); Employee employee = (Employee)session.get(Employee.class, EmployeeID); session.delete(employee); tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } }}编译和执行下面是编译和运行上述提到的应用程序的步骤。在编译和执行应用程序之前确保你已经设置好了 PATH 和 CLASSPATH。 创建设置章节中所讲的 hibernate.cfg.xml 配置文件。 创建上文所述的 Employee.hbm.xml 映射文件。 创建上文所述的 Employee.java 源文件并且进行编译。 创建上文所述的 ManageEmployee.java 源文件并且进行编译。 执行二进制的 ManageEmployee 来运行程序。 你将会得到如下结果，记录将会在 EMPLOYEE 表中建立。 $java ManageEmployee.......VARIOUS LOG MESSAGES WILL DISPLAY HERE........First Name: Zara Last Name: Ali Salary: 1000First Name: Daisy Last Name: Das Salary: 5000First Name: John Last Name: Paul Salary: 10000First Name: Zara Last Name: Ali Salary: 5000First Name: John Last Name: Paul Salary: 10000如果你检查你的 EMPLOYEE 表，它将会有如下记录： mysql> select * from EMPLOYEE;+----+------------+-----------+--------+| id | first_name | last_name | salary |+----+------------+-----------+--------+| 29 | Zara | Ali | 5000 || 31 | John | Paul | 10000 |+----+------------+-----------+--------+2 rows in set (0.00 secmysql>