[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 628
  • Last Modified:

Multiple instances of executereader and an open connection

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


   
   
0
VSWhite
Asked:
VSWhite
  • 2
1 Solution
 
fullcontactCommented:
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
 
fullcontactCommented:
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.
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now