Solved

ExecuteReader: Connection property has not been initialized.

Posted on 2007-03-23
10
231 Views
Last Modified: 2008-02-01
Using vb.net 2005 - I just need to run a quick query...and return the results.
I have the query defined in Access (2003), so if it works to just execute that, I'm okay with that route as well...
Here's my code:

Dim strSQL As String = "SELECT EntryDate, UserName, IIf(Decision=True,'gratned','denied') AS Permitted, Amount FROM tblHistory WHERE ShareName=[@ShareName];"
Dim sConStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\*****\*****\tsset.mdb;" 'server data masked

Dim con As OleDbConnection = New OleDbConnection(sConStr)
con.Open()
Dim ShareParm As New OleDbParameter
With ShareParm  'I've not used parameters before, so maybe I didn't set this up correctly?
  .ParameterName = "@ShareName"
  .OleDbType = OleDbType.VarChar
  .Size = 50
  .Value = txtShare.Text
End With

Dim cmd As OleDbCommand = New OleDbCommand(strSQL)
cmd.Parameters.Add(ShareParm)

Dim dr As OleDbDataReader = cmd.ExecuteReader  ' <<<  This is where it bombs with the error in the title

While dr.Read
   ....
0
Comment
Question by:sirbounty
  • 7
  • 3
10 Comments
 
LVL 34

Accepted Solution

by:
Sancler earned 500 total points
ID: 18779400
Add

cmd.Connection = con

after

Dim cmd As OleDbCommand = New OleDbCommand(strSQL)

Roger
0
 
LVL 67

Author Comment

by:sirbounty
ID: 18779418
Yay!  It's Roger (aka, Mr. Patience)  :^)
Let me give that a shot...thanx.
0
 
LVL 67

Author Comment

by:sirbounty
ID: 18779446
I got a ContextSwitchDeadlock (oh my! )
0
Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 67

Author Comment

by:sirbounty
ID: 18779498
Hmm - worked that time (I was stepping before)...but when it gets to the dr.read section, it skips right over, as if it's not 'read' anything...any idea (or does this take us outside of the scope of the original question?)
0
 
LVL 34

Expert Comment

by:Sancler
ID: 18779525
Turn this

"SELECT EntryDate, UserName, IIf(Decision=True,'gratned','denied') AS Permitted, Amount FROM tblHistory WHERE ShareName=[@ShareName];"

into this

"SELECT EntryDate, UserName, IIf(Decision=True,'gratned','denied') AS Permitted, Amount FROM tblHistory WHERE ShareName = ?;"

or even this

"SELECT EntryDate, UserName, IIf(Decision=True,'gratned','denied') AS Permitted, Amount FROM tblHistory WHERE ShareName = ?"

OleDb uses ? rather than names as placeholders and then applies the parameters in the ORDER in which they are referred to rather than using their NAMES.

Roger
0
 
LVL 34

Expert Comment

by:Sancler
ID: 18779551
And is 'gratned' intended to be 'granted'?  Not that that should affect operation ;-)

Roger
0
 
LVL 67

Author Comment

by:sirbounty
ID: 18779588
No it doesn't - and I've flipflopped that numerous times (because in the Access query, it's misspelled...I keep copying from that and then updating it in my code...haha) - but thanx for noticing...
0
 
LVL 67

Author Comment

by:sirbounty
ID: 18779607
Hmm - nope, neither work.
Since you've obviously solved the question as stated, I'll open this in a new one...(hoping that you'll help me there as well! :^)
0
 
LVL 67

Author Comment

by:sirbounty
ID: 18779642
http://www.experts-exchange.com/Q_22468189.html if you're interested.
Thanx Roger. :^)
0
 
LVL 67

Author Comment

by:sirbounty
ID: 18779671
<smack> - I was testing this in my form_load...so my txtShare was empty! lol...
Thanx Roger
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This tutorial demonstrates one way to create an application that runs without any Forms but still has a GUI presence via an Icon in the System Tray. The magic lies in Inheriting from the ApplicationContext Class and passing that to Application.Ru…
The ECB site provides FX rates for major currencies since its inception in 1999 in the form of an XML feed. The files have the following format (reducted for brevity) (CODE) There are three files available HERE (http://www.ecb.europa.eu/stats/exch…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question