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Why no error closing datareader or connection objects?
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This message was discovered on ASPFriends.com 'ngfx-oledb' list.


TBrewi@aol.com
-- Moved from [aspngdata] to [ngfx-oledb] by Marcie Jones <Click here to reveal e-mail address> --

In the following code, I expected to get an error on Lines 13 or 15 because I
specified CommandBehavior.CloseConnection on Line 7. Leave it to me to
worry about NOT getting an error! Shouldn't I get a runtime error trying to
close a reader or connection that's already closed?

L1 Dim objConnection As New OleDbConnection()
L2 objConnection.ConnectionString = ...and.so.on...
L3 Dim strSQL As String = "SELECT * FROM Clients"
L4 Dim objCommand As New OleDbCommand(strSQL, objConnection)
L5 Dim objDataReader As OleDbDataReader
L6 objConnection.Open()
L7 objDataReader =
objCommand.ExecuteReader(CommandBehavior.CloseConnection)
L8 objDataReader.Read()
L9 With objDataReader
L10 strLastName = .Item("LastName").ToString
L11 ...and.so.on...
L12 End With
L13 objDataReader.Close()
L14 objDataReader = Nothing
L15 objConnection.Close()
L16 objCommand = Nothing

As a .NET newbie, I welcome any other comments on how to do the above in the
most efficient way.

-- Tim :)

Timothy M. Brewi
Reply to this message...
 
    
Daniel Naumann
Tim,

I don't really remember the answer but there were several detailed discussions
of this topic over on the ASPNG-architecture list. If you search the archives
you'll find a tonne of information (it was a few months ago.......).

Daniel.

-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: 24-Jul-2002 05:28
To: ngfx-oledb
Subject: [ngfx-oledb] Why no error closing datareader or connection
objects?

-- Moved from [aspngdata] to [ngfx-oledb] by Marcie Jones
<Click here to reveal e-mail address> --

In the following code, I expected to get an error on Lines 13 or 15 because I
specified CommandBehavior.CloseConnection on Line 7. Leave it to me to
worry about NOT getting an error! Shouldn't I get a runtime error trying to
close a reader or connection that's already closed?

L1 Dim objConnection As New OleDbConnection()
L2 objConnection.ConnectionString = ...and.so.on...
L3 Dim strSQL As String = "SELECT * FROM Clients"
L4 Dim objCommand As New OleDbCommand(strSQL, objConnection)
L5 Dim objDataReader As OleDbDataReader
L6 objConnection.Open()
L7 objDataReader =
objCommand.ExecuteReader(CommandBehavior.CloseConnection)
L8 objDataReader.Read()
L9 With objDataReader
L10 strLastName = .Item("LastName").ToString
L11 ...and.so.on...
L12 End With
L13 objDataReader.Close()
L14 objDataReader = Nothing
L15 objConnection.Close()
L16 objCommand = Nothing

As a .NET newbie, I welcome any other comments on how to do the above in the
most efficient way.

-- Tim :)

Timothy M. Brewi
| [ngfx-oledb] member Click here to reveal e-mail address = YOUR ID
| http://www.aspfriends.com/aspfriends/ngfx-oledb.asp = JOIN/QUIT
Reply to this message...
 
 
System.Data.CommandBehavior
System.Data.OleDb.OleDbCommand
System.Data.OleDb.OleDbConnection
System.Data.OleDb.OleDbDataReader




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