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SQL Server Valid XML

Posted on 2013-06-10
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Last Modified: 2013-06-10
My following schema works and throws an error if an invalid schema is passed in

So if I use this
<root0MwljpDk4TE</root>

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This error is thrown
Msg 6909, Level 16, State 1, Line 2
XML Validation: Text node is not allowed at this location, the type was defined with element only content or with simple content. Location: /*:root[1]

But I can't seem to get error handling to work.
If I use womething like this I don;t get the @@Error part returned. Just the initial XML Validation error
DECLARE @x XML(videoSchema)
        
SELECT  @x = '<root>0MwljpDk4TE=</root>'

IF @@error <> 0
   PRINT '@err is ' + ltrim(str(@@error)) + '.'

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Heres my schema

CREATE XML SCHEMA COLLECTION videoSchema
    AS'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="root" >
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="encString" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>'

DECLARE @x XML(videoSchema)
SELECT @x = '<root><encString>0MwljpDk4TE=</encString></root>'

SELECT @x

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Question by:lrbrister
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2 Comments
 
LVL 32

Accepted Solution

by:
Brendt Hess earned 2000 total points
ID: 39235835
I believe you need to move to the TRY... CATCH error handling for XML syntax errors.  These errors come from the XML engine, which is not perfectly integrated in SQL 2005.

Since all of your code should be in the TRY block, and all error handling in the CATCH block - and the @@error is not always correctly set in XML errors (as you discovered), I tend to work like this with XML coding in 2005

DECLARE @x XML(videoSchema)
DECLARE @stepFlag int

BEGIN TRY
    SET @stepFlag=1
    SELECT  @x = '<root0MwljpDk4TE=</root>'

    SET @stepFlag = 2
....

END TRY

BEGIN CATCH
    IF @stepFlag=1
    BEGIN
        PRINT 'XML Error at Step 1 - ' + @x
        PRINT '@errorvalue: ' + ltrim(str(@@error)) + '.'
    END

    IF @stepFlag=2
    BEGIN
         .....

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0
 

Author Closing Comment

by:lrbrister
ID: 39235943
Got me started.

Thanks
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