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  Tutorial: ASP Database Related AddCriteria Simplifies SQL Queries Tutorial

AddCriteria is a small function that simplifies the code needed to produce a SQL query from a set of optional criteria posted by a user. This article explains how to use this function.

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AddCriteria Simplifies SQL Queries With ASP Database

Occasionally one discovers a subroutine that greatly simplifies a complex ASP page, transforming spaghetti-like code into something that is easy to maintain. In this article I share one such function used when I need to produce an SQL query from a number of optional criteria posted by the user.

Building an SQL string from optionally posted criteria is tricky. You need to check if the user posted a value since only then is the criteria included in the query. Numeric entries are different from character entries and multiple-selection fields require additional processing to produce a valid SQL query. Fields that might contain single quotes need special attention to prevent syntax errors.


 

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