在休眠中创建保存点和回滚 [英] Creating savepoint and rollingback in hibernate

问题描述

如何创建一个保存点以及如何在hibernate中发生异常时使用回滚我知道它是如何在jdbc中工作的，但我被困在Hibernate程序中创建保存点。

我的程序是'public class StudentStoredData {
public static void main（String [] args）{

  String name =; 
 int count = 0; 
 int cond = 0; 
 //创建配置对象
配置cfg = new Configuration（）; 
 cfg.configure（Student.cfg.xml）; //填充配置文件的数据
 
 
 SessionFactory factory = cfg.buildSessionFactory（）; 
会话会话= factory.openSession（）; 
 Transaction t = session.beginTransaction（）; 
 
尝试{
 do {
 Scanner scn = new Scanner（System.in）; 
 System.out.println（输入1插入，0退出）; 
 cond = scn.nextInt（）; 
 if（cond == 0）
 break; 
学生e1 =新生Student（）; 
 
 System.out.println（Enter Id）; 
 int id = scn.nextInt（）; 
 e1.setId（id）; 
 System.out.println（Enter name）; 
 name = scn.next（）; 
 e1.setName（name）; 
 
 session.persist（e1）; //持久化对象
 System.out.println（saved saved）; 
 
 t.commit（）; 
 
} while（cond！= 0）; 
} catch（Exception e）{
 System.out.println（保存值发生错误，回滚最近的更改）; 
} finally {
 session.close（）; 
} 
  

}
}
'
是学生类，id和name作为属性，setter和getter方法作为持久类。我在哪里获得连接变量..我是新的冬眠。

解决方案

为实现保存点，您需要实现工作界面。在执行过程中，您可以执行自定义任务，例如更新数据库等。

  Work work = new Work（）{
 public void execute（Connection arg0）throws SQLException {
 // custom task 
} 
}; 
  

通话

session.doWork（work）

如果有任何缩写，请致电

connection.rollback（work）

How to create a savepoint and how to use rollback if exception occurs in hibernate I know how it works in jdbc but i got stuck creating savepoint in hibernate program.

My program is 'public class StudentStoredData { public static void main(String[] args) {

String name = " ";
int count = 0;
int cond = 0;
// creating configuration object
Configuration cfg = new Configuration();
cfg.configure("Student.cfg.xml");// populates the data of the configuration file


SessionFactory factory = cfg.buildSessionFactory();
Session session = factory.openSession();
Transaction t = session.beginTransaction();

try {
  do {
    Scanner scn = new Scanner(System.in);
    System.out.println("enter 1 to insert and 0 to quit");
    cond = scn.nextInt();
    if (cond == 0)
      break;
    Student e1 = new Student();

    System.out.println("Enter Id ");
    int id = scn.nextInt();
    e1.setId(id);
    System.out.println("Enter name ");
    name = scn.next();
    e1.setName(name);

    session.persist(e1);// persisting the object
    System.out.println("successfully saved");

      t.commit();

  } while (cond != 0);
} catch (Exception e) {
  System.out.println("error occured in saving values . rolling back the recent changes");
  } finally {
  session.close();
}

} } ' Their is student class with id and name as attribute and setter and getter method as persistent class. Where do i get the connection variable .. I am new to hibernate .

解决方案

For implementing savepoint, you need to implement Work interface. In the implementation , you would do your custom tasks like updating database etc.

Work work = new Work() {
    public void execute(Connection arg0) throws SQLException {
             //custom task
    }
};

The call

session.doWork(work)

And if there is any exxception just call

connection.rollback(work)

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