https://github.com/kawodyaarachchige/hql-assignment-hibernate

Assignment: ORM Supplementary Assignment
https://github.com/kawodyaarachchige/hql-assignment-hibernate

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Assignment: ORM Supplementary Assignment

• Host: GitHub
• URL: https://github.com/kawodyaarachchige/hql-assignment-hibernate
• Owner: kawodyaarachchige
• Created: 2024-02-13T20:51:42.000Z (11 months ago)
• Default Branch: main
• Last Pushed: 2024-02-13T20:52:38.000Z (11 months ago)
• Last Synced: 2024-11-09T06:06:42.844Z (2 months ago)
• Language: Java
• Size: 5.86 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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# Assignment: ORM Supplementary Assignment

Q1

    String hql = "from Books b where b.publicationYear > 2010";

        Query query = session.createQuery(hql);

        List  list = query.list();

        for(Books b:list){

            System.out.println(b.getId()+" "+b.getTitle()+" "+b.getPublicationYear()+" "+b.getPrice());

        }

Q2 

    String hql = " UPDATE Books b SET price = b.price /100 *110 WHERE b.author.id = :id";

        Query query = session.createQuery(hql);

        query.setParameter("id", 1);

        int isUpdated = query.executeUpdate();

        System.out.println(isUpdated> 0 ? "Updated" : "Not Updated");

Q3

    

     String hqlDeleteBooks = "delete from Books b where b.author.id = :authorId";

        Query queryDeleteBooks = session.createQuery(hqlDeleteBooks);

        queryDeleteBooks.setParameter("authorId", 1);

        int deletedBooksCount = queryDeleteBooks.executeUpdate();

        System.out.println("Deleted " + deletedBooksCount + " associated books");

        String hqlDeleteAuthor = "delete from Author a where a.id = :authorId";

        Query queryDeleteAuthor = session.createQuery(hqlDeleteAuthor);

        queryDeleteAuthor.setParameter("authorId", 1);

        int deletedAuthorCount = queryDeleteAuthor.executeUpdate();

        System.out.println(deletedAuthorCount > 0 ? "Author deleted" : "Author not found");

Q4

 

        String hql = " select avg(b.price) from Books b";

        Query query = session.createQuery(hql);

        double avg = (double) query.getSingleResult();

        System.out.println(avg);

Q5

        String hql = "select  a.name , count(b) from Author a left join a.books b group by a.name";

        Query query = session.createQuery(hql);

        List  list = query.list();

        for(Object[] obj:list){

            System.out.println(obj[0]+" "+obj[1]);

Q6

        String hql = "select a.name, b.title from Author a inner join a.books b where a.country =:country";

        Query query = session.createQuery(hql);

        query.setParameter("country", "Pakistan");

        List  list = query.list();

        for (Object[] obj:list){

            System.out.println(obj[0]+" "+obj[1]);

Q7 

        

        @JoinColumn(name = "author_id") private Author author;

Q10

        Query query = session.createQuery("SELECT a.name FROM Author a WHERE ( SELECT COUNT(b.id) FROM Books b" +

                " WHERE a.id = b.author.id ) > ( SELECT AVG(authorBookCount) FROM ( SELECT COUNT(b.id) AS authorBookCount " +

                "FROM Books b GROUP BY b.author.id ))");

        List resultList = query.getResultList();

        for (String s : resultList) {

            System.out.println(s);

        }