asked on

ExecuteReader: Connection property has not been initialized.

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
....

ASKER CERTIFIED SOLUTION

Sancler

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sirbounty

ASKER

Yay! It's Roger (aka, Mr. Patience) :^)
Let me give that a shot...thanx.

sirbounty

ASKER

I got a ContextSwitchDeadlock (oh my! )

sirbounty

ASKER

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?)

Sancler

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

Sancler

And is 'gratned' intended to be 'granted'? Not that that should affect operation ;-)

Roger

sirbounty

ASKER

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...

sirbounty

ASKER

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! :^)

sirbounty

ASKER

https://www.experts-exchange.com/questions/22468189/oleDBDataReader-is-apparently-empty.html if you're interested.
Thanx Roger. :^)

sirbounty

ASKER

<smack> - I was testing this in my form_load...so my txtShare was empty! lol...
Thanx Roger