How to Achieve ResultSet Pagination in Java for Efficient Data Display?

ResultSet Pagination in Java

To convert a ResultSet object to a paginated view in a JSP, follow these steps:

1. Add Request Parameters:

• Add "firstrow" and optionally "rowcount" parameters to the JSP.

2. Create Paging Buttons:

• Include "next" and "previous" buttons to adjust the "firstrow" value with the row count.

3. Execute SQL Query for Sublist:

• Use SQL LIMIT and OFFSET clauses in MySQL and PostgreSQL to retrieve a sublist of results:

  <code class="sql">SELECT id, username, job, place FROM contact ORDER BY id LIMIT %d OFFSET %d</code>

• Use a subquery with rownum clause in Oracle:

  <code class="sql">SELECT id, username, job, place FROM (SELECT id, username, job, place FROM contact ORDER BY id) WHERE ROWNUM BETWEEN %d AND %d</code>

• Use row_number() in DB2:

  <code class="sql">SELECT id, username, job, place FROM (SELECT row_number() OVER (ORDER BY id) AS row, id, username, job, place FROM contact) AS temp WHERE row BETWEEN %d AND %d</code>

4. Process Servlet Request:

• Parse the "firstrow" and "rowcount" parameters, adjust the values, and handle overflows.

5. Display Sublist in JSP:

• Present the sublist using JSTL c:forEach and a table.

6. Avoid Inefficient Sublist Loading:

• Instead of storing the entire result in memory and using List#subList(), execute the sublist query directly from the database. This is more memory-efficient with large datasets.

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