Base on the SqlMapper source, OpenConnection will store it into LocalSession and unless you close it, calling OpenConnection again will cause an error.


So like Sam has stated below, are you sure your “using” statement is not closing the connection somewhere?  We may need more examples (preferably a complete working one) to analyze your issue.


I have manually opened and use the same connection myself with many existing project.  I have also verified this in Sql Profiler result with only one:


RPC:Completed exec sp_reset_connection         



Tom Nguyen
Sr. Developer

From: Clough, Samuel (USPC.PRG.Atlanta) []
Sent: Friday, May 04, 2007 7:03 AM
Subject: RE: Sessions


I be way off, but at first glance,  isn't wrapping things in a using statement going to ensure that the resources are closed?  I'm not sure that's what you want to do.  We always let iBatis manage the connections automatically.  Of course, I haven't profiled to see what it actually does.


From: Dorin Manoli []
Sent: Friday, May 04, 2007 5:44 AM
Subject: Sessions

Hi everybody.

I got a little trouble with connections.


First I will start with a brief description of my Application.


I got a Class Library which includes iBATIS XML files, persistent classes. Also in this Library is a static class Mapper which create and configure DomSqlMap and through which I can cal lISqlMapper..

I followed example from iBATIS document.

Then I assigned a MAP class to each persistent class.

Ex. I have Customer class then I create another class CustomerMap which contains methods for operations like Add/Update/Delete.


I have couple of  such class-combination. Finaly I have a WinForm application from which I call MAP classes and render information on screen.


Finally    the problem:

I used JetBrains dotTrace profiler to optimize my code and I found that each time I call a method from MAP class iBATIS OpenConnection method is called.

I thought if I‘ll use Sessions I will save “precious” 13ms on each OpenConnection call. So I followecd example from iBATIS Maper manual.



using ( IDalSession session = sqlMap.OpenConnection() )


Account account = sqlMap.QueryForObject("GetAccountViaColumnName", 1) as Account;



But instead of calling sqlMap.QueryObject

I am using


using ( IDalSession session = Mapper.Instance().OpenConnection() )


       Customer cust=customerMap.GetCustomer(customerId);

       ……. . . . .



Inside GetCustomer I have


Mapper.Instance().QueryForObject(… . . );



Profiling again I saw that OpenConnection is invoked again.

Something went wrong, but couldn’t find in any manual how to properly use Session. Also looking in unit tests Ididn’t found answers.




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