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Multiple instances of executereader and an open connection

Posted on 2006-06-11
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Last Modified: 2013-12-25
Greetings Experts,

My question involves using an executeReader in a for/next loop.  My code: \

Dim SConn As SqlConnection = New SqlClient.SqlConnection(sConnectionString)
 SConn.Open()

 Dim cmd2 As New SqlCommand
 cmd2.Connection = SConn

  For Incr = 0 To Counter
        Str = "Select Officer from RescueCheckout Where RDate = '" & RDate & "' and RescueNumber = '" & Units(Incr) & "'"
        cmd2.CommandText = Str
        cmd2.Connection = SConn
         sqlreader = cmd2.ExecuteReader
         If sqlreader.HasRows  Then
                info(Jncr) = Units(Incr)
                Jncr = Jncr + 1
            End If
            SConn.Close()
 Next
 
It appears that I must close and then reopen a connection for each iteration of the for/next.  Is this correct?  I would think that I could use the same connection for each ExecuteReader.

Thansk

V Whitehead


   
   
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Question by:VSWhite
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2 Comments
 
LVL 3

Accepted Solution

by:
fullcontact earned 2000 total points
ID: 16885340
You do not need to close your connection within to loop, but you need to close the reader. You can only have one reader open at a time, ie :-

Replace

SConn.Close

With

sqlreader.close
0
 
LVL 3

Expert Comment

by:fullcontact
ID: 16885397
Could you try and use a single SQL to do this ie not using a loop 0 to counter

Select RescueNumber from RescueCheckout Where RDate = '" & RDate & "' and RescueNumber between 0 AND " & Counter

 This would return all the rescuenumbers which exists between 0 and counter.
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