Question

Cannot convert between unicode and non-unicode (SSIS)

Asked by: james10004

I am receiving this error when trying to copy data from an Oracle table to a SQL Server table. The Oracle datatypes are varchar2 and in SQL Server they're varchar. I've included the Data Conversion task and tried every possible datatype, but I've still had no luck. I'm using ADO.NET and OracleClient Data Provider as my source, and OLE DB and SQL Server Native Client 10.0 as my destination.

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Asked On
2009-07-31 at 08:56:57ID24617138
Tags

SQL Server 2008 SSIS Oracle

,

SSIS

Topics

MS SQL Server

,

SSIS

Participating Experts
3
Points
500
Comments
4

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Answers

 

by: tigin44Posted on 2009-07-31 at 09:08:54ID: 24990142

what is the error message you get?

 

by: james10004Posted on 2009-07-31 at 09:48:26ID: 24990511

Error at Data Flow Task [OLE DB Destination [5083]]: Column "LISTING_TYPE" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [5083]]: Column "MLS_LISTING_ID" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [SSIS.Pipeline]: "component "OLE DB Destination" (5083)" failed validation and returned validation status "VS_ISBROKEN".

Error at Data Flow Task [SSIS.Pipeline]: One or more component failed validation.

Error at Data Flow Task: There were errors during task validation.

 

by: HwkrangerPosted on 2009-07-31 at 12:01:00ID: 24991471

You ahve to explicity type cast when converting.  I use either a CONVERT column task or a DERIVED column task to conver the column.  This mostly commonly happens when using XML.  Strings are unicode when you generate a XSD.  Instead of modifying the XSD, I explicitly type cast the column that is unicode.

You can also make your destination column an NVARCHAR instead of VARCHAR column as well.

 

by: HoggZillaPosted on 2009-07-31 at 14:46:23ID: 24992719

Unicode in SQL is nvarchar vs. non unicode, varchar. If the output from the Oracle ADO source is DT_STR, then that is non-unicode. If it is DT_WSTR then that is unicode.

Right click on Source ADO and choose Advanced Edit, last tab, choose External Output columns, check the datatypes.

20120131-EE-VQP-002

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