Stored Procedures- Switch statements?

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Basically in a bid to lower the amount of code I have im trying to combine my search query into one procedure instead of 3.

Users can search reports by Title,Description or Author.
The current procedure looks something like this

	(
	@SearchQuery NVARCHAR(100),
	@FolderID INT,
	@SearchType NVARCHAR(100)
	)
AS
BEGIN
	SELECT 
	ReportDetailsID,
        Name

	FROM 
	Reports
	WHERE

	FolderID = @FolderID AND
		
	CASE @SearchType
	WHEN 'Name' THEN Name  LIKE '%'+@SearchQuery+'%' 
	WHEN 'Desc' THEN Description  LIKE '%'+@SearchQuery+'%' 
	WHEN 'Author' THEN CreatedBy  LIKE '%'+@SearchQuery+'%' 
	
END

The idea was that I run the procedure and give it a string value of what kind of search it is I want to search by and the final where statement is based off that choice

How do I do this kind of statement properly? My attempt was based off similar SQL but they didn't have the like element to the problem

Posted 28-Sep-11 2:51am

Phoenix234

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Nicholas Butler · Accepted Answer · 2011-09-28T03:23:00

You could include all options in the SQL and use boolean expressions to turn off the ones you don't need:

SQL

<br />
SELECT ...<br />
FROM ...<br />
WHERE<br />
    ( @SearchType = 'Name' AND Name LIKE '%'+@SearchQuery+'%' )<br />
    OR<br />
    ( @SearchType = 'Desc' AND Description LIKE '%'+@SearchQuery+'%' )<br />
    OR<br />
        ...<br />

Nick

André Kraak · Accepted Answer · 2011-09-28T03:29:00

Solution 2

Have at these possible solutions:
Optimizing Conditional WHERE Clauses: Avoiding ORs and CASE Expressions[^]
SQL WHERE clauses: Avoid CASE, use Boolean logic[^]

Posted 28-Sep-11 3:29am

André Kraak