ODC Data Types for parameters?

Hi
I have an ODC (Office data Connection) file which my Excel uses to fetch info from SQL server.
It works mostly fine, but I need to fully understand the DataType used for the parameter aspect of the query.
By default, whenaadd a parameter, it's given a DataType of "12".
When I try to pass mor ethan appro 300 characters back to the SQL database I get an error, if I reduce the size of data being passed (eg; 200 chars) it works fine.
I'm thinking this could be related to the  DataType value of "12" I'm using - I wonder what other values are available and do they allow to pass a larger string size of parameter value?
See below ODC code for ref


<html xmlns:o="urn:schemas-microsoft-com:office:office"
	xmlns="http://www.w3.org/TR/REC-html40" xmlns:msdt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882">
	<head>
		<meta http-equiv=Content-Type content="text/x-ms-odc; charset=utf-8">
		<meta name=ProgId content=ODC.Table>
		<meta name=SourceType content=ODBC>
		<title>CWL</title>
		<xml id=docprops><o:DocumentProperties
		  xmlns:o="urn:schemas-microsoft-com:office:office"
		  xmlns="http://www.w3.org/TR/REC-html40">
		  <o:Description>Channel Warranty List</o:Description>
		  <o:Name>CWL</o:Name>
		 </o:DocumentProperties>
		</xml>
		<xml id=msodc>
			<odc:OfficeDataConnection
				xmlns:odc="urn:schemas-microsoft-com:office:odc"
				xmlns="http://www.w3.org/TR/REC-html40">
				<odc:Connection odc:Type="ODBC">
					 <odc:ConnectionString>DRIVER=SQL Server;SERVER=myserver,3180;Trusted_Connection=Yes;DATABASE=mydb</odc:ConnectionString>
						[b] <odc:Parameter>
							<odc:Name>Parameter1</odc:Name>
							<odc:DataType>12</odc:DataType>
						   </odc:Parameter>[/b]
						<odc:CommandText>{call dbo.sp_name(?,?)}</odc:CommandText>
						<odc:SSOApplicationID>SSO_CPLG-GRL</odc:SSOApplicationID>
						<odc:CredentialsMethod>Stored</odc:CredentialsMethod>
						<odc:AlwaysUseConnectionFile/>
				</odc:Connection>
			</odc:OfficeDataConnection>
		</xml>
	</head>
</html>

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fjkilkenAsked:
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lcohanDatabase AnalystCommented:
I believe by default Excel data type is tied to varchar(255) and please see details below about how to adjust or workaround by eventually using different connectors instead(like ODBC or OLEDB)

"The truncated text problem

A very similar issue is when you have a text column in your Excel sheets that sometimes has more than 255 characters in a single cell. A common example is a “comments” column.
"

...
"The solution part III

The problem is the same as before: the provider scans the first 8 rows and finds only text of normal length. SSIS takes the default data type of (DT_WSTR,255) for all string data. Our comments are sometimes larger than 255 characters, causing the truncation error.

If your comments have a maximum length lower than the 4000 character limit of DT_WSTR, you can simply adjust the length of the column in the advanced editor of the source component or you can configure the source to ignore the failure.
"

http://blogs.lessthandot.com/index.php/datamgmt/dbprogramming/mssqlserver/what-s-the-deal-with/
http://microsoft-ssis.blogspot.ca/2011/06/mixed-data-types-in-excel-column.html
http://office.microsoft.com/en-ca/excel-help/overview-of-connecting-importing-data-HP010201710.aspx#BMusing_external_data_ranges_and_proper
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Microsoft SQL Server 2008

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