How to delete a record from a table the table reference is in another table using hibernate - postgresql

Question

I am newbie on Hibernate,
I want to perform deletion on one table the current table is referenced to another table.
Ex: Client_Loan is my main table i want to perform deletion on this, and the another table is 'Loan_Details'. the loan_details table contains the foreign_Key reference to the client_loan id.
i want to perform delete on client_loan table, if i delete client loan table the references in another table also want to delete at one shot using Hibernate can any one tell me how to perform.
Thanks in advance.

Answer 1

You must be having classes like below
#Entity
#Table(name="Client_Loan")
public class ClientLoan {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
#OneToMany(cascade = CascadeType.ALL,
mappedBy = "client", orphanRemoval = true)
private List<Loan_Details> loans = new ArrayList<>();
public void setName(String name) {
this.name = name;
}
public List<Loan_Details> getComments() {
return loans;
}
public void addComment(Loan_Details loan) {
loans.add(loan);
}
}
below for load details
#Entity
#Table(name="Loan_Details ")
public class LoanDetails {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToOne
private Client_Loan client;
public void setPost(Client_Loan post) {
this.post = post;
}
public String getReview() {
return review;
}
public void setReview(String review) {
this.review = review;
}
}
Now in ClientLoan in OnetoMany mapping cascade = CascadeType.ALL
it means when you will delete CleintLoan all the LoanDetails will be deleted automatically

Answer 2

First delete from Loan_Details then Client_loan
First delete from Loan_Details then Client_loan
int id = 2;
Session session=getSession();
String hql = "delete from Loan_Details where client_loanid = :id";
session.createQuery(hql).setString("id", new Integer(id)).executeUpdate();
hql = "delete from Client_Loan where clientid = :id";
session.createQuery(hql).setString("id", new Integer(id)).executeUpdate();