How to generate a single object from two tables in hibernate?

Question

How to generate a single object from two tables in hibernate ?

I have two tables

1. Question table
2. options table

Question table
----------------
questionId | question 
--------------------
 1         | who invented java ?
 2         | who invented computer ?


 Options table
 --------------

 OptionId | option |questionId
 ------------------------------
  1       | santos | 1
  2       | james  | 1
  3       | jashuwa| 1
  4       | jhon   | 1
  5       | charles| 2
  6       | ram    | 2
  7       | raj    | 2
  8       | rohit  | 2

Now, I have a VO object like below

class QuestionAndOptions {

String questionId;
String question;
Sting option1Id;
String option1;
Sting option2Id;
String option2;
Sting option3Id;
String option3;
Sting option4Id;
String option4;

//getter and setter methods

}

Now, How can i create a QuestionAndOptions object using hibernate ?

Now, How can i create a list of QuestionAndOptions objects using hibernate ?

Any idea how i should this make ?

Answer 1

Based on provided tables graph I can see that relationship between Question table and Options table is one-to-many. So for your case objects will be following:

@Table(name="QUESTION")
public class Question{
    @Id
    @Column(...)
    private Long questionId;
    @Column(...)
    private String questionText;
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "question")
    private List<Option> options
//getters and setters
}

@Table(name="OPTION")
public class Option{
    @Id
    @Column(...)
    private Long optionId;
    @Column(...)
    private String optionText;
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "QUESTION_ID", nullable = false)
    private Question question;
    //getters and setters
}

Answer 2

From your table structure it looks like QuestionId is a foreign key in Options table and there is a one-to-many relationship between Question and options. Hibernate classes for this can be as follows -

class Option{
    String optionId;
    String option;
    Question question;
} 

class Question{
    String questionId;
    String question;
    Set<Option> options;
}

The QuestionAndOptions structure mentioned by you might be a little hard to maintain. You can obviously have some code to transform the hibernate objects retrieved into the structure you wish.