Implementation of pagination in coldfusion - sql

Question

We are trying to implement pagination in coldfusion.So that I need to make changes in sql query to fetch only a perticular number of data and when clicking on next button, next set of data should be queried.
SELECT History.*,User.FirstName,User.LastName
FROM History
LEFT OUTER JOIN User ON History.UserID = User.UserID
WHERE History.UserID = <CFQUERYPARAM VALUE="#UserID#" CFSQLTYPE="CF_SQL_INTEGER">
AND Type IS NOT NULL
AND SubType IS NOT NULL
ORDER BY #OrderBy# #sort#
Can anyone help me to do the same with above given query.
example query :
SELECT * FROM (
SELECT ROW_NUMBER() OVER(ORDER BY SearchID) AS NUMBER,
* FROM search_history
WHERE UserID=111
AND Date >= #DateVal#
) AS TBL
WHERE NUMBER BETWEEN ((#pageNum# - 1) * #MaxRows# + 1) AND (#pageNum# * #MaxRows#)
ORDER BY #OrderBy# #sort#

Answer 1

First, this is an issue with SQL Server and not ColdFusion. You're just generating the query inline with ColdFusion. It would be better if you create this query as a stored procedure, which by nature would perform better than an inline query.
Second, this answer is the basis for the example I'm posting. SQL Server famously has not supported OFFSET and LIMIT, which makes paging dead simple. These have been in MySQL and postgreSql forever.
Third, as of SQL Server 2012, there is now support for OFFSET and FETCH (essentially LIMIT). Here is a good example of how that works.
This example uses SQL #parameters. Ideally you would declare these in a stored procedure, but you can declare and set them in your inline query. Just make sure to use cfqueryparam to protect against SQL Injection attacks.
SELECT *
FROM (
SELECT
h.column1
, h.column2
, u.FirstName
, u.LastName
, SELECT ROW_NUMBER() OVER ( ORDER BY #ORDER_BY #SORT_ORDER ) AS RowNum
FROM
dbo.History h
INNER JOIN
dbo.User u ON h.UserID = u.UserID
WHERE
h.UserID = #USER_ID
AND
h.Type IS NOT NULL
AND
h.SubType IS NOT NULL
) AS HistorySearch
WHERE
RowNum >= #ROW_START
AND
RowNum < #ROW_END
ORDER BY
RowNum
You'll want to calculate the values of ROW_START and ROW_END based on the page number and a page size variable.
Finally, don't use SELECT * in your main select query. It's a bad practice.

Answer 2

Depending on how much data you are returning you can do your query normally and do pagination on the output with cold fusion. And if you can avoid using * in the query that is a good idea.
<cfparam name="StartAt" default="1">
<cfparam name="MaxRows" default="100">
<cfoutput name="QueryName" startrow="#StartAt#" maxrows="#maxRows#" >
The variables MaxRows and StartAt would be set in your form, and passed when the user clicks Next or previous.
If you have a very large result set then limiting the data returned would be a better idea as you have put forward.