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PORazor VB - Pass a Null value if a Request variable is empty
 

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  1. PORazor VB - Pass a Null value if a Request variable is empty
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    <p>I've been trying so hard to find a solution for this, but no luck. I'm fairly new to VB and SQL, but this shouldn't be too hard. I've inherited a lot of code and there's not too much room to change db attribute types or anything.</p> <p>I'm trying to run an UPDATE query using parameters in Razor, like so:</p> <pre><code> Dim updateCommand = "UPDATE [tblJobRating] SET [ProjectManagement] = @0, [ProjComments] = @1, [Schedule] = @2, [SchedComments] = @3 WHERE [JobRatingID] = @4" </code></pre> <p>All of the columns in question need INT values, but I have one exception where I need to pass it a null value (passing another number or zero won't do). Essentially a "N/A" value for the user.</p> <p>I assign the variables from Post requests, like so:</p> <pre><code>Dim projMgmt = Request.Form('projMgmt') ' ... Dim sched = Request.Form('sched') </code></pre> <p>I have the "N/A" value posting no value right now (or it can be a string and I can check for IsNumber if need be, I guess). But when I call the query execution, it enters the value as a 0.</p> <pre><code>db.Execute(updateCommand, projMgmt, projComments, sched, schedComments, ratingId) </code></pre> <p>It needs to be a NULL value for the backend to work properly. I've tried type checking and passing <code>Nothing</code>, <code>System.Data.SqlTypes.SqlInt32.Null</code>, etc., but it either gives conversion errors or sets to 0. How can I pass it properly?</p> <p><strong>Edit:</strong> I left out the first param in the db.Execute method, passing in the updateCommand. Edited for clarity.</p>
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    1. USMarc Ripley
    1. USMarc Ripley
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    1. COCan you supply additional information about your db.Execute method -- doesn't look familiar to me. What params does it accept?
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    2. COThe db.execute command uses placeholders to pass values to the sql statement (@0 = projMgmt, @1 = projComments...) and is used in Razor to prevent sql injection. I forgot to pass in the first param, the updateCommand that it executes. I edited that now. http://www.asp.net/web-pages/tutorials/introducing-aspnet-web-pages-2/form-basics
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