Hibernate - HQL pagination

Question

This is a problem similar to: HQL - row identifier for pagination

I\'m trying to implement pagination using HQL. I have a PostgreSQL database.

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Answer 1

We can achieve the pagination by using Query and Criteria interface:

Pagination using Query Interface:

There are two methods of the Query interface for pagination.

1. Query setFirstResult(int startPosition): This method takes an integer that represents the first row in your result set, starting with row 0.

2. Query setMaxResults(int maxResult): This method tells Hibernate to retrieve a fixed number maxResults of objects. Using above two methods together, we can construct a paging component in our web or Swing application.

Example:

Query query = session.createQuery("FROM Employee");
query.setFirstResult(5);
query.setMaxResults(10);
List list = query.list();
for(Employee emp: list) {            
   System.out.println(emp);
}

Pagination using Criteria Interface:

There are two methods of the Criteria interface for pagination.

1. Criteria setFirstResult(int firstResult):

Set the first result to be retrieved.

2. List item Criteria setMaxResults(int maxResults):

Set a limit upon the number of objects to be retrieved.

Example:

Criteria criteria = session.createCriteria(Employee.class);
criteria.setFirstResult(5);
criteria.setMaxResults(10);            
List list = criteria.list();
for(Employee emp: list) {            
    System.out.println(emp);
}