Best practice for pagination in Oracle?

Question

Problem: I need write stored procedure(s) that will return result set of a single page of rows and the number of total rows.

Solution A: I create tw

Answer 1

A clean way to organize your SQL code could be trough WITH statement.

The reduced version implements also total number of results and total pages count.

For example

WITH SELECTION AS (
    SELECT FIELDA, FIELDB, FIELDC FROM TABLE), 
NUMBERED AS (
    SELECT 
    ROW_NUMBER() OVER (ORDER BY FIELDA) RN, 
    SELECTION.*
    FROM SELECTION)
SELECT
    (SELECT COUNT(*) FROM NUMBERED) TOTAL_ROWS,
    NUMBERED.*
FROM NUMBERED
WHERE 
    RN BETWEEN ((:page_size*:page_number)-:page_size+1) AND (:page_size*:page_number)

This code gives you a paged resultset with two more fields:

• TOTAL_ROWS with the total rows of your full SELECTION
• RN the row number of the record

It requires 2 parameter: :page_size and :page_number to slice your SELECTION

Reduced Version

Selection implements already ROW_NUMBER() field

WITH SELECTION AS (
    SELECT 
        ROW_NUMBER() OVER (ORDER BY FIELDA) RN,
        FIELDA, 
        FIELDB, 
        FIELDC 
    FROM TABLE) 
SELECT
    :page_number PAGE_NUMBER,
    CEIL((SELECT COUNT(*) FROM SELECTION ) / :page_size) TOTAL_PAGES,
    :page_size PAGE_SIZE,
    (SELECT COUNT(*) FROM SELECTION ) TOTAL_ROWS,
    SELECTION.*
FROM SELECTION 
WHERE 
    RN BETWEEN ((:page_size*:page_number)-:page_size+1) AND (:page_size*:page_number)