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POWriting dynamic SQL queries
 

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    <p>I am having problems trying to create a fairly simple dynamic SQL query. The variables don't display the values they contain when I PRINT @SQLString. Any ideas?</p> <pre><code> ALTER PROCEDURE [dbo].[usp_ItemSearch] @ItemNum varchar(30) = NULL ,@SearchFilter int ,@VendorNum varchar(10) = NULL ,@RecUserID int = NULL ,@StartDate smalldatetime = NULL ,@EndDate smalldatetime = NULL AS DECLARE @SQLString as varchar(1000) SET @SQLString = 'SELECT RecID, VendorNum, VendorName, PORelNum, InvoiceNum, ItemNum, RecAddDate, LastUpdated FROM tbl_Processor_ItemDscLog' IF @ItemNum IS NOT NULL BEGIN IF @SearchFilter = 2 BEGIN SET @SQLString = @SQLString + ' WHERE ItemNum LIKE ''%' + @ItemNum + '''' --Ends with END IF @SearchFilter = 1 BEGIN SET @SQLString = @SQLString + ' WHERE ItemNum LIKE ''%' + @ItemNum + '%''' --Contains END IF @SearchFilter = 0 BEGIN SET @SQLString = @SQLString + ' WHERE ItemNum LIKE ''' + @ItemNum + '%''' --Starts with END END IF @VendorNum IS NOT NULL BEGIN SET @SQLString = @SQLString + ' WHERE VendorNum = ''' + @VendorNum + '''' END IF @RecSearchUserID IS NOT NULL BEGIN SET @SQLString = @SQLString + ' AND (RecAddUserID = @RecUserID)' END IF (@EndDate IS NOT NULL) BEGIN IF (@StartDate IS NOT NULL) BEGIN SET @SQLString = @SQLString + ' WHERE RecAddDate between @StartDate AND @EndDate ' END ELSE BEGIN SET @SQLString = @SQLString + ' RecAddDate BETWEEN 01/01/1996 AND @EndDate + ' END END SET @SQLString = @SQLString + ' ORDER BY ItemNum, VendorNum' PRINT @SQLString </code></pre>
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    1. USFrank
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    1. COIs your `PRINT @SQLString` inside the stored procedure? (I can't see it)
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      1. USXavier Poinas
    2. COYes it is. I just edited the code. Thanks for that.
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      1. USFrank
    3. COThere are good reasons why should avoid doing dynamic SQL in T-SQL. For example, what happens if `@ItemNum` is `O'Malley`? In general, do not do dynamic SQL this way. Do it in a middle-tier component as a parameterized query.
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      1. USThomas
 

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