Wednesday, January 7, 2009

sql_variant causes SSIS metadata validation error

Just a quick note about an error that stumped me for a minute.

I was setting up a Lookup task in SSIS 2005 using the results of a SQL query as the lookup, but I kept getting the following error when attempting to create the column mappings:

TITLE: Microsoft Visual Studio

Error at Load Position Limit Data [Lookup [49]]: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x8000FFFF.

Error at Load Position Limit Data [Lookup [49]]: The call to Lookup transform method, ReinitializeMetadata, failed.


Exception from HRESULT: 0xC02090F0 (Microsoft.SqlServer.DTSPipelineWrap)

This didn't seem like a very helpful error, until I thought about what ReinitializeMetadata probably did, and then realized that my query selected a sql_variant column without casting it. Casting the sql_variant to a more appropriate data type (varchar, in this case) resolved the error.

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