Last Updated : 28 Apr, 2025
Pagination is the process of dividing a large set of data into smaller, more manageable chunks or pages for easier navigation and faster loading times. It is a common technique used in web applications to display a large amount of data to users, while also providing them with a way to navigate through the data in a controlled and efficient manner. Pagination typically involves dividing the data into fixed-size "chunks" or "pages," and then displaying only one page at a time. Users can then navigate through the pages using links, buttons, or other controls, to view additional data.
Pagination offers several benefits, such as:
Overall, pagination is a common technique used to improve the usability and performance of web applications that deal with large amounts of data.
Pagination in HQLCreate an HQL query: Create an HQL query to retrieve the records from the database. For example:
Java
String hql = "FROM User";
Query query = session.createQuery(hql);
Set the first result: Use the setFirstResult() method of the Query interface to set the index of the first record to retrieve. This is a zero-based index, so the first record has an index of 0, the second record has an index of 1, and so on. For example:
Java
int firstResult = 20;
query.setFirstResult(firstResult);
Set the maximum number of results: Use the setMaxResults() method of the Query interface to set the maximum number of records to retrieve. For example:
Java
int maxResults = 10;
query.setMaxResults(maxResults);
Execute the query: Execute the query using the list() method of the Query interface to retrieve the records from the database. For example:
Java
List<User> users = query.list();
Display the results: Display the retrieved records to the user in the desired format, such as a table or a list. By using these steps, we can easily retrieve a subset of records from a larger result set, improving performance and making it easier for users to navigate and access the information they need.
ExampleSuppose we have a database table named "Employee" with thousands of records. We want to display a list of employees on a web page, but we don't want to load all the records at once because it can be slow and resource-intensive. We can use pagination to retrieve only a subset of the records and display them on the current page.
Java
// Calculate pagination parameters
int pageNumber = 1;
int pageSize = 10;
int firstResult = (pageNumber - 1) * pageSize;
// Create a HQL query to retrieve employees
String hql = "FROM Employee";
Query query = session.createQuery(hql);
// Set pagination parameters
query.setFirstResult(firstResult);
query.setMaxResults(pageSize);
// Retrieve employees from the database
List<Employee> employees = query.list();
// Display employees on the current page
for (Employee employee : employees) {
System.out.println(employee.getName() + " - " + employee.getSalary());
}
In this example, we calculate the pagination parameters based on the current page number and page size. We create an HQL query to retrieve all employees from the "Employee" table. We set the pagination parameters using the setFirstResult() and setMaxResults() methods of the Query interface. Finally, we retrieve the employees from the database and display them on the current page. This allows us to display a small subset of the records at a time, which can improve performance and user experience.
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