public static void delete (int id) {
// Create an EntityManager
EntityManager manager = ENTITY_MANAGER_FACTORY.createEntityManager();
EntityTransaction transaction = null;
try {
// // Get a transaction
transaction = manager.getTransaction();
// // Begin the transaction
transaction.begin();
// This part---------------------------------------------------------------------------------------------------------------------------------------------------
Student stu = manager.find(Student.class, id);
// // Delete the student
manager.remove(stu);
// // Commit the transaction
transaction.commit();
} } catch (Exception ex) {
// // If there are any exceptions, roll back the changes
if (transaction != null) {
transaction.rollback();
}
// // Print the Exception
ex.printStackTrace();
} } finally {
// // Close the EntityManager
manager.close();
}
}
The syntax is to access Student.java class from Hibernate to the constructor and delete it with the key value of id.
ex) delete(2); // delete Student data matching id=2.
If I write it like this, I think I need to create a lot of Delete methods for each class
So,
public static void delete (intid, String class name ) {
Class name stu = manager.find(class name.class,id);
}
As above, we tried to implement a single delete method by adding a variable as String class name and delete(3, Course)//(delete the course data matching id=3), but when we write the constructor, we have to input the class name ourselves. 클래스 When we declare the class constructor, can we receive it as a different variable and declaring the class constructor? I'd appreciate it if you could give me.
hibernate database method java
public static void delete (int id, String k) {
.... ...
if(k=="Student"){
Student stu = manager.find(Student.class, id);
...
}else if(k=="Course"){
Course cou = manager.find(Course.class, id);
...
}else if(k=="Score"){
Score sco = manager.find(Score.class, id);
... }else{...}
... ...
}
I couldn't see anything too simple because I was trying to put it too directly. I'm sorry.
© 2024 OneMinuteCode. All rights reserved.