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Send Null to SQL Stored Proc with XML Parameters

Posted on 2009-07-07
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Last Modified: 2012-06-27
Hi

I have a web form where the user will enter some information in a textbox.
The user may leave the texbox blank

Problem lies is how do i check for null (empty string value) when i send the string to the stored procedure.... i want to convert these to nulls at add the null to my table
vb
 
Dim xmlProdDimWebString = ""
 
 
Dim ProductLabel As TextBox = MyForm.FindControl("ProductLabelTextBox")
Dim ProductWidth As TextBox = MyForm.FindControl("ProductWidthTextBox")
Dim ProductHeight As TextBox = MyForm.FindControl("ProductHeightTextBox")
Dim ProductDepth As TextBox = MyForm.FindControl("ProductDimDepthTextBox")
Dim ProductDiameter As TextBox = MyForm.FindControl("ProductDimDiameterTextBox")
 
 
xmlProdDimWebString = xmlProdDimWebString + "<Product><id>" & _
             "<Label>" & ProductLabel.Text & "</Label>" & _
             "<Width>" & ProductWidth.Text & "</Width>" & _
             "<Height>" & ProductHeight.Text & "</Height>" & _
             "<Depth>" & ProducDepth.Text & "</Depth>" & _
             "<Diameter>" & ProductDiameter.Text & "</Diameter>" & _
             "</id></Product>"
 
 
Dim ProductDimensionParameter As New Parameter()
ProductDimensionParameter.Name = "ProductDimensions"
ProductDimensionParameter.DefaultValue = xmlProdDimWebString
ProductDimensionParameter.Direction = Data.ParameterDirection.Input
ProductDimensionParameter.DbType = Data.DbType.Xml
SQLDS.InsertParameters.Add(ProductDimensionParameter)
SQLDS.Insert()
 
 
sql
 
@ProdDimensions XML
 
 
as
 
 
DECLARE @ProductId INT --testing
SET @ProductId = 1 --testing
 
 
INSERT INTO Inventory.Dimensions
(ProductId, Width, Height, Depth, Diameter, LabelName)
SELECT	@ProductId,
		ParamValues.ID.query('Width').value('.','FLOAT'),
		ParamValues.ID.query('Height').value('.','FLOAT'),
		ParamValues.ID.query('Depth').value('.','FLOAT'),
		ParamValues.ID.query('Diameter').value('.','FLOAT'),
		ParamValues.ID.query('Label').value('.','VARCHAR(30)')
		FROM @ProdDimensions.nodes('/Product/id') as ParamValues(ID)

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Question by:miguel_j
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8 Comments
 
LVL 9

Expert Comment

by:Rahul Goel ITIL
ID: 24801213
Use like this
(ProductLabel.Text.ToString() == string.Empty ? DbNull.Value : ProductLabel.Text.ToString())
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Author Comment

by:miguel_j
ID: 24802984
Thanks Rahu..

It still adds a 0 into the table field...

How do i check for a null on the stored procedure
0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 24810729
If you do not include the Xml element, then the value will be NULL and it will be added as NULL to the table.
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Author Comment

by:miguel_j
ID: 24811117
i removed the element from the xmlstring but it still adds a 0

is there a way to check from empty string or null at the storedproc

e.g

isNull(ParamValues.ID.query('Height').value('.','FLOAT'), Null)
0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 24813957
>>i removed the element from the xmlstring but it still adds a 0<<
You are right.  As a workaround consider using OPENXML() which does not have that problem.
0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 24814075
Alternatively you could try it this way and it will give you the Null you need (Height is not included):

DECLARE @ProdDimensions XML

SET @ProdDimensions =
    '<Product>
      <id>
          <Label>Label Description</Label>
          <Width>1234.56</Width>
          <Depth>3456.78</Depth>
          <Diameter>4567.89</Diameter>
      </id>
    </Product>'

SELECT      @ProdDimensions.value('(/Product/id/Width)[1]','FLOAT'),
      @ProdDimensions.value('(/Product/id/Height)[1]', 'FLOAT'),
      @ProdDimensions.value('(/Product/id/Depth)[1]', 'FLOAT'),
      @ProdDimensions.value('(/Product/id/Diameter)[1]', 'FLOAT'),
      @ProdDimensions.value('(/Product/id/Label)[1]', 'VARCHAR(30)')

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LVL 75

Accepted Solution

by:
Anthony Perkins earned 500 total points
ID: 24814145
Or if you still want to use the nodes method then this will produce the right results:

SELECT      ParamValues.ID.value('(Width)[1]', 'FLOAT'),
      ParamValues.ID.value('(Height)[1]', 'FLOAT'),
      ParamValues.ID.value('(Depth)[1]', 'FLOAT'),
      ParamValues.ID.value('(Diameter)[1]', 'FLOAT'),
      ParamValues.ID.value('(Label)[1]', 'VARCHAR(30)')
FROM      @ProdDimensions.nodes('/Product/id') as ParamValues(ID)
 
Totally unrelated, unless you have to, do not use float, instead use numeric.
0
 

Author Closing Comment

by:miguel_j
ID: 31600980
Thank You acperkins,
Ive worked with your input... Im only sending the parameters that I need and have adapted your sql method to parse my string.

ps. Ive also removed the use of float and accepted decimal or numeric
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