Question

ODBCParametersCollection data transfers between 2 data sources - By Reference

Asked by: TimPeer

I have a C++ application I had written sometime ago wherein I am calling the ODBC API directly, SQLDescribeCol, SQLExecute etc. to copy data between data sources. I am updating the application on C Sharp. The approach I used, allocate buffers on the heap and map the addresses to the ODBC API calls  by reference. The resulting transfers are very very efficient. Data has changed and new requirements seem to indicate a C Sharp rewrite of the application. Managed code will not be as efficient, but it will be very stable without the foibles of unmanaged heap allocation.

The approach that I am coding will implement ODBCParameters and prepared statements for the transfer operations.

Question, for efficiency I would think populating the source adapter's ODBCParameterCollection once for each row and reference the collection by the target data source would seem to be the most efficient way to transfer rows from Source to Target data tables.

Is this possible?

Transaction operations include: Delete from where ... , insert into ... update where ...

Thanks!

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Asked On
2009-05-28 at 22:52:54ID24447498
Tags

C Sharp

,

ODBC DataAdapters

,

ODBCParameterCollection

,

Data Transfers by reference

Topics

.NET

,

C# Programming Language

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: TheLearnedOnePosted on 2009-05-29 at 13:14:43ID: 24505821

I am confused about " I would think populating the source adapter's ODBCParameterCollection once for each row".  Are you saying that parameters would change for each row?

 

by: TimPeerPosted on 2009-05-29 at 13:39:12ID: 24506026

Indeed. The app will copy rows from data source (source) to data source (target) and there can be millions of rows in a table(s).

Using a parameter marker (odbcparameter), I should be able to:

 prepare the SQL statement
 Load the odbcparameter collection (opc) from the source (a parameter for each datacolumn)
 
 Transfer the opc to the target adapter.
 Executenonquery to load the data.

I hope to perform the function without transferring the opc (iteratively for each column) to the target before I execute ExecuteNonQuery.

Ideally, it would be preferred to populate the opc on the source and update the target dataadapter by reference with the source's parameter collection.

 

by: TheLearnedOnePosted on 2009-05-29 at 13:43:31ID: 24506063

Can you provide more detail about what you are trying to do, because it doesn't sound possible as described?

 

by: TimPeerPosted on 2009-05-29 at 13:54:56ID: 24506149

I need to (replicate) transfer data from SQL Server (A) to Oracle 11g (B).

Am using System.Data.ODBC implementation.

with C++ I could allocate heap space equiv. to the size of the row.
SQLBindCol by reference from source to heap space at absolute boundries for the col.
SQLbindCol by reference to the Target to same heap space at absolute boundries for the col.

Process (in general):
      Open cursor on source table
      Open target table for update
      prepare connection SQLPrepare
      Bind SQLBindCol to source using GlobalAlloc (heap)
      Bind SQLBindCol to target using addresses from source's GlobalAlloc call.
      for each row on source table.
         Read a row of data from source table to buffers Source's SQLBindCol...
         Update or insert (SQLExecute) to target using referenced heap space.
      end for
      Close cursor
      close source table
      close target table

Source table and target table are identical.

Under C#, I am trying to implement something similar (using managed classes) .


 

by: TheLearnedOnePosted on 2009-05-29 at 14:01:59ID: 24506201

If you are using ODP (Oracle Data Provider), then I would use the System.Data.SqlClient, and SqlDataReader to read the data, and then perform something like a bulk insert on the Oracle side.

Bulk Operations Using Oracle Data Provider for .NET (ODP.NET)
http://dotnetslackers.com/articles/ado_net/BulkOperationsUsingOracleDataProviderForNETODPNET.aspx

 

by: TimPeerPosted on 2009-05-29 at 14:46:56ID: 31586571

This looks promising... thank you.

20120131-EE-VQP-002

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