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ExecuteReader requires an open and available Connection. The connection's current state is Open, Executing.

I am using VB.Net 2003 and MS Access (connecting using OleDBConnection ).
I read using DataAdapter and DataSet, not DataReader.
When many people try to access the database at the same time, I get the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use ExecuteReader,
why the error says ExecuteReader. What does it mean ?
When I get this error, is there a way for me to loop and wait until there is
an open and available Connection ?
Thank you.

Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet

With cmd
.Connection = ConnectionDemoO LE
.CommandText = sql
Try
da = New OleDb.OleDbData Adapter
ds = New DataSet
da.SelectComman d = cmd
da.Fill(ds)
Catch ex As Exception
msgbox ex.message '-error "ExecuteRea der requires an open and
available Connection. The connection's current state is Open, Executing."
end try
Apr 17 '07 #1
7 13537
On Apr 16, 11:25 pm, "fniles" <fni...@pfmail. comwrote:
When many people try to access the database at the same time, I get the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use ExecuteReader,
why the error says ExecuteReader. What does it mean ?
Internally, the Fill method uses ExecuteReader.
When I get this error, is there a way for me to loop and wait until there is
an open and available Connection ?
Thank you.

Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet

With cmd
.Connection = ConnectionDemoO LE
Where is ConnectionDemoO LE defined? Is this a global variable? If
so, then try creating a new connections instead of using an existing
variable. Generally, it is better to create a connection, use it, and
then close it rather than to open a connection and keep it around for
a long time.
Chris

Apr 17 '07 #2
Thank you.
In this case ConnectionDemoO LE is a global variable.
I tried to create a new connection (connection pooling) and close it right
after I fill a dataset (I do not wait until it access the dataset), but I
get an error "Unspecifie d Error" at the Open method, I think it is caused
when the maximum pool size has been reached. I am using MS Access database.
Do you know what is the maximum pool size for MS Access ?
In my other posting I posted a question, when the maximum pool size has been
reached, can I somehow loop and wait until there is an available connection
again ? Or, maybe can I increase the connection time out in MS Access
connection ?

Try
ConnectionOLE = New OleDb.OleDbConn ection
OpenDBOLE = True
With ConnectionOLE
.ConnectionStri ng = g_dbPath
.Open() --IF MAX POOL SIZE HAS BEEN REACHED, IT WILL GO
to the Catch. How can I loop and wait to open the db until a connection is
available again ?
End With
Catch ex As Exception
Try
"Chris Dunaway" <du******@gmail .comwrote in message
news:11******** **************@ y5g2000hsa.goog legroups.com...
On Apr 16, 11:25 pm, "fniles" <fni...@pfmail. comwrote:
>When many people try to access the database at the same time, I get the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use
ExecuteReade r,
why the error says ExecuteReader. What does it mean ?

Internally, the Fill method uses ExecuteReader.
>When I get this error, is there a way for me to loop and wait until there
is
an open and available Connection ?
Thank you.

Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet

With cmd
.Connection = ConnectionDemoO LE

Where is ConnectionDemoO LE defined? Is this a global variable? If
so, then try creating a new connections instead of using an existing
variable. Generally, it is better to create a connection, use it, and
then close it rather than to open a connection and keep it around for
a long time.
Chris

Apr 17 '07 #3
On Apr 17, 9:40 am, "fniles" <fni...@pfmail. comwrote:
Thank you.
In this case ConnectionDemoO LE is a global variable.
I tried to create a new connection (connection pooling) and close it right
after I fill a dataset (I do not wait until it access the dataset), but I
get an error "Unspecifie d Error" at the Open method, I think it is caused
when the maximum pool size has been reached. I am using MS Access database.
Do you know what is the maximum pool size for MS Access ?
In my other posting I posted a question, when the maximum pool size has been
reached, can I somehow loop and wait until there is an available connection
again ? Or, maybe can I increase the connection time out in MS Access
connection ?

Try
ConnectionOLE = New OleDb.OleDbConn ection
OpenDBOLE = True
With ConnectionOLE
.ConnectionStri ng = g_dbPath
.Open() --IF MAX POOL SIZE HAS BEEN REACHED, IT WILL GO
to the Catch. How can I loop and wait to open the db until a connection is
available again ?
End With
Catch ex As Exception
Try

"Chris Dunaway" <dunaw...@gmail .comwrote in message

news:11******** **************@ y5g2000hsa.goog legroups.com...
On Apr 16, 11:25 pm, "fniles" <fni...@pfmail. comwrote:
When many people try to access the database at the same time, I get the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use
ExecuteReader,
why the error says ExecuteReader. What does it mean ?
Internally, the Fill method uses ExecuteReader.
When I get this error, is there a way for me to loop and wait until there
is
an open and available Connection ?
Thank you.
Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet
With cmd
.Connection = ConnectionDemoO LE
Where is ConnectionDemoO LE defined? Is this a global variable? If
so, then try creating a new connections instead of using an existing
variable. Generally, it is better to create a connection, use it, and
then close it rather than to open a connection and keep it around for
a long time.
Chris
I don't know the max pool size (I am thinking it's 110 by default),
but looking at your code your I don't see where you are disposing the
connection objects. AFAIK, If you don't dispose of them, they will sit
around idle taking up a space in the pool until the GC runs. This is
very bad as the GC will run when it wants to, meaning it might take a
while before any of the connections are released. I highly suggest you
wrap the connection objects in a Using block - that way you won't need
to wait for the GC.

Also, if you want to keep trying to open the connection you could do
something like this:

' Typed in message

Dim conn as new OleDbConnection (connString)
Using (conn)
Dim maxTries as Integer = 10
For i as Integer = 1 to maxTries
Try
conn.Open()
' The connection opened
Exit For
Catch
' The connection did not open
If i = maxTries Then
Msgbox("I give up!")
Return
Else
' Wait for a bit before trying again
Threading.Threa d.Sleep(1000)
Continue For
End If
End Try
Next i
' Do whatever with the connection
End Using

I used a for loop to prevent a case where the program might get stuck
in an infinite loop, and a call to Thread.Sleep to prevent making too
many calls. You should adjust these settings to meet your needs.

Thanks,

Seth Rowe

Apr 17 '07 #4
Thank you very much

For this application, we are still using VB.Net 2003, and I do not see the
"Using" block or "Continue For". Do the following codes look OK ?

Function OpenDBDemoOLE(B yRef ConnectionDemoO LE As OleDb.OleDbConn ection)
As Boolean
Dim iMaxTries As Int16 = 5

Try
ConnectionDemoO LE = New OleDb.OleDbConn ection
OpenDBDemoOLE = True
With ConnectionDemoO LE
.ConnectionStri ng = g_dbPathDemo
For iCnt As Int16 = 1 To iMaxTries
Try
.Open()
Exit For
Catch ex3 As Exception
If iCnt iMaxTries Then
OpenDBDemoOLE = False
swError = New
StreamWriter(Ap plication.Start upPath & "\ErrorLog.txt" , True)
swError.Write(N ow & " OpenDBDemoOLE - iCnt = " &
iCnt & " iMaxTries = " & iMaxTries & " error = " & ex3.Message & vbCrLf)
swError.Close()
swError = Nothing
Else
Thread.Sleep(10 00)
End If
End Try
Next iCnt
End With
Catch ex As Exception
OpenDBDemoOLE = false
End Try

I do close the connection like in the following codes:

Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet
Dim ConnectionDemoO LE As OleDb.OleDbConn ection
With cmd
bDBSuccess = OpenDBDemoOLE(C onnectionDemoOL E)
If bDBSuccess Then
.Connection = ConnectionDemoO LE
.CommandText = sql
Try
da = New OleDb.OleDbData Adapter
ds = New DataSet
da.SelectComman d = cmd
da.Fill(ds)
CloseConDemoOLE (ConnectionDemo OLE)
Catch ex As Exception
end try

Sub CloseConDemoOLE (ByRef ConnectionDemoO LE As OleDb.OleDbConn ection)
If Not ConnectionDemoO LE Is Nothing Then
ConnectionDemoO LE.Close()
ConnectionDemoO LE = Nothing
End If
End Sub

Function OpenDBDemoOLE(B yRef ConnectionDemoO LE As OleDb.OleDbConn ection)
As Boolean
Dim iMaxTries As Int16 = 5

Try
ConnectionDemoO LE = New OleDb.OleDbConn ection
OpenDBDemoOLE = True
With ConnectionDemoO LE
.ConnectionStri ng = g_dbPathDemo
For iCnt As Int16 = 1 To iMaxTries
Try
.Open()
Exit For
Catch
If iCnt <= iMaxTries Then
Thread.Sleep(10 00)
End If
End Try
Next iCnt
End With
Catch ex As Exception
OpenDBDemoOLE = false
End Try
end Function

"rowe_newsgroup s" <ro********@yah oo.comwrote in message
news:11******** **************@ q75g2000hsh.goo glegroups.com.. .
On Apr 17, 9:40 am, "fniles" <fni...@pfmail. comwrote:
>Thank you.
In this case ConnectionDemoO LE is a global variable.
I tried to create a new connection (connection pooling) and close it
right
after I fill a dataset (I do not wait until it access the dataset), but I
get an error "Unspecifie d Error" at the Open method, I think it is caused
when the maximum pool size has been reached. I am using MS Access
database.
Do you know what is the maximum pool size for MS Access ?
In my other posting I posted a question, when the maximum pool size has
been
reached, can I somehow loop and wait until there is an available
connection
again ? Or, maybe can I increase the connection time out in MS Access
connection ?

Try
ConnectionOLE = New OleDb.OleDbConn ection
OpenDBOLE = True
With ConnectionOLE
.ConnectionStri ng = g_dbPath
.Open() --IF MAX POOL SIZE HAS BEEN REACHED, IT WILL
GO
to the Catch. How can I loop and wait to open the db until a connection
is
available again ?
End With
Catch ex As Exception
Try

"Chris Dunaway" <dunaw...@gmail .comwrote in message

news:11******* *************** @y5g2000hsa.goo glegroups.com.. .
On Apr 16, 11:25 pm, "fniles" <fni...@pfmail. comwrote:
When many people try to access the database at the same time, I get
the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use
ExecuteReade r,
why the error says ExecuteReader. What does it mean ?
Internally, the Fill method uses ExecuteReader.
>When I get this error, is there a way for me to loop and wait until
there
is
an open and available Connection ?
Thank you.
>Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet
>With cmd
.Connection = ConnectionDemoO LE
Where is ConnectionDemoO LE defined? Is this a global variable? If
so, then try creating a new connections instead of using an existing
variable. Generally, it is better to create a connection, use it, and
then close it rather than to open a connection and keep it around for
a long time.
Chris

I don't know the max pool size (I am thinking it's 110 by default),
but looking at your code your I don't see where you are disposing the
connection objects. AFAIK, If you don't dispose of them, they will sit
around idle taking up a space in the pool until the GC runs. This is
very bad as the GC will run when it wants to, meaning it might take a
while before any of the connections are released. I highly suggest you
wrap the connection objects in a Using block - that way you won't need
to wait for the GC.

Also, if you want to keep trying to open the connection you could do
something like this:

' Typed in message

Dim conn as new OleDbConnection (connString)
Using (conn)
Dim maxTries as Integer = 10
For i as Integer = 1 to maxTries
Try
conn.Open()
' The connection opened
Exit For
Catch
' The connection did not open
If i = maxTries Then
Msgbox("I give up!")
Return
Else
' Wait for a bit before trying again
Threading.Threa d.Sleep(1000)
Continue For
End If
End Try
Next i
' Do whatever with the connection
End Using

I used a for loop to prevent a case where the program might get stuck
in an infinite loop, and a call to Thread.Sleep to prevent making too
many calls. You should adjust these settings to meet your needs.

Thanks,

Seth Rowe

Apr 17 '07 #5
On Apr 17, 3:00 pm, "fniles" <fni...@pfmail. comwrote:
Thank you very much

For this application, we are still using VB.Net 2003, and I do not see the
"Using" block or "Continue For". Do the following codes look OK ?

Function OpenDBDemoOLE(B yRef ConnectionDemoO LE As OleDb.OleDbConn ection)
As Boolean
Dim iMaxTries As Int16 = 5

Try
ConnectionDemoO LE = New OleDb.OleDbConn ection
OpenDBDemoOLE = True
With ConnectionDemoO LE
.ConnectionStri ng = g_dbPathDemo
For iCnt As Int16 = 1 To iMaxTries
Try
.Open()
Exit For
Catch ex3 As Exception
If iCnt iMaxTries Then
OpenDBDemoOLE = False
swError = New
StreamWriter(Ap plication.Start upPath & "\ErrorLog.txt" , True)
swError.Write(N ow & " OpenDBDemoOLE - iCnt = " &
iCnt & " iMaxTries = " & iMaxTries & " error = " & ex3.Message & vbCrLf)
swError.Close()
swError = Nothing
Else
Thread.Sleep(10 00)
End If
End Try
Next iCnt
End With
Catch ex As Exception
OpenDBDemoOLE = false
End Try

I do close the connection like in the following codes:

Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet
Dim ConnectionDemoO LE As OleDb.OleDbConn ection
With cmd
bDBSuccess = OpenDBDemoOLE(C onnectionDemoOL E)
If bDBSuccess Then
.Connection = ConnectionDemoO LE
.CommandText = sql
Try
da = New OleDb.OleDbData Adapter
ds = New DataSet
da.SelectComman d = cmd
da.Fill(ds)
CloseConDemoOLE (ConnectionDemo OLE)
Catch ex As Exception
end try

Sub CloseConDemoOLE (ByRef ConnectionDemoO LE As OleDb.OleDbConn ection)
If Not ConnectionDemoO LE Is Nothing Then
ConnectionDemoO LE.Close()
ConnectionDemoO LE = Nothing
End If
End Sub

Function OpenDBDemoOLE(B yRef ConnectionDemoO LE As OleDb.OleDbConn ection)
As Boolean
Dim iMaxTries As Int16 = 5

Try
ConnectionDemoO LE = New OleDb.OleDbConn ection
OpenDBDemoOLE = True
With ConnectionDemoO LE
.ConnectionStri ng = g_dbPathDemo
For iCnt As Int16 = 1 To iMaxTries
Try
.Open()
Exit For
Catch
If iCnt <= iMaxTries Then
Thread.Sleep(10 00)
End If
End Try
Next iCnt
End With
Catch ex As Exception
OpenDBDemoOLE = false
End Try
end Function

"rowe_newsgroup s" <rowe_em...@yah oo.comwrote in message

news:11******** **************@ q75g2000hsh.goo glegroups.com.. .
On Apr 17, 9:40 am, "fniles" <fni...@pfmail. comwrote:
Thank you.
In this case ConnectionDemoO LE is a global variable.
I tried to create a new connection (connection pooling) and close it
right
after I fill a dataset (I do not wait until it access the dataset), but I
get an error "Unspecifie d Error" at the Open method, I think it is caused
when the maximum pool size has been reached. I am using MS Access
database.
Do you know what is the maximum pool size for MS Access ?
In my other posting I posted a question, when the maximum pool size has
been
reached, can I somehow loop and wait until there is an available
connection
again ? Or, maybe can I increase the connection time out in MS Access
connection ?
Try
ConnectionOLE = New OleDb.OleDbConn ection
OpenDBOLE = True
With ConnectionOLE
.ConnectionStri ng = g_dbPath
.Open() --IF MAX POOL SIZE HAS BEEN REACHED, IT WILL
GO
to the Catch. How can I loop and wait to open the db until a connection
is
available again ?
End With
Catch ex As Exception
Try
"Chris Dunaway" <dunaw...@gmail .comwrote in message
>news:11******* *************** @y5g2000hsa.goo glegroups.com.. .
On Apr 16, 11:25 pm, "fniles" <fni...@pfmail. comwrote:
When many people try to access the database at the same time, I get
the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use
ExecuteReader,
why the error says ExecuteReader. What does it mean ?
Internally, the Fill method uses ExecuteReader.
When I get this error, is there a way for me to loop and wait until
there
is
an open and available Connection ?
Thank you.
Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet
With cmd
.Connection = ConnectionDemoO LE
Where is ConnectionDemoO LE defined? Is this a global variable? If
so, then try creating a new connections instead of using an existing
variable. Generally, it is better to create a connection, use it, and
then close it rather than to open a connection and keep it around for
a long time.
Chris
I don't know the max pool size (I am thinking it's 110 by default),
but looking at your code your I don't see where you are disposing the
connection objects. AFAIK, If you don't dispose of them, they will sit
around idle taking up a space in the pool until the GC runs. This is
very bad as the GC will run when it wants to, meaning it might take a
while before any of the connections are released. I highly suggest you
wrap the connection objects in a Using block - that way you won't need
to wait for the GC.
Also, if you want to keep trying to open the connection you could do
something like this:
' Typed in message
Dim conn as new OleDbConnection (connString)
Using (conn)
Dim maxTries as Integer = 10
For i as Integer = 1 to maxTries
Try
conn.Open()
' The connection opened
Exit For
Catch
' The connection did not open
If i = maxTries Then
Msgbox("I give up!")
Return
Else
' Wait for a bit before trying again
Threading.Threa d.Sleep(1000)
Continue For
End If
End Try
Next i
' Do whatever with the connection
End Using
I used a for loop to prevent a case where the program might get stuck
in an infinite loop, and a call to Thread.Sleep to prevent making too
many calls. You should adjust these settings to meet your needs.
Thanks,
Seth Rowe
I didn't have time to read through your code, but I'll see if I can
get to it later. As for your other questions...
For this application, we are still using VB.Net 2003, and I do not see the
"Using" block or "Continue For"
You can replace Using with a try...finally pair:

Dim conn as new OleDbConnection (connString)
try
conn.Open()
finally
conn.Dispose()
end try

And you should be able to ignore the continue for - it will continue
automatically.

Thanks,

Seth Rowe

Apr 17 '07 #6
basically; MS conned us all into buying .net 2.0 and SQL 2005 by
including 'MARS'

but then you STILL can't open two things on the same connection; like
you used to be able to in ADO Classic

..NET is crap l choose to go back to ADO classic


On Apr 16, 9:25 pm, "fniles" <fni...@pfmail. comwrote:
I am using VB.Net 2003 and MS Access (connecting using OleDBConnection ).
I read using DataAdapter and DataSet, not DataReader.
When many people try to access the database at the same time, I get the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use ExecuteReader,
why the error says ExecuteReader. What does it mean ?
When I get this error, is there a way for me to loop and wait until there is
an open and available Connection ?
Thank you.

Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet

With cmd
.Connection = ConnectionDemoO LE
.CommandText = sql
Try
da = New OleDb.OleDbData Adapter
ds = New DataSet
da.SelectComman d = cmd
da.Fill(ds)
Catch ex As Exception
msgbox ex.message '-error "ExecuteRea der requires an open and
available Connection. The connection's current state is Open, Executing."
end try

Apr 18 '07 #7
I disagree with your 'better'

it is 'more verbose' yes you are correct

better-- NO

not having to rewrite everything would be _BETTER_

On Apr 17, 6:17 am, Chris Dunaway <dunaw...@gmail .comwrote:
On Apr 16, 11:25 pm, "fniles" <fni...@pfmail. comwrote:
When many people try to access the database at the same time, I get the
error "ExecuteRea der requires an open and available Connection. The
connection's current state is Open, Executing." I do not use ExecuteReader,
why the error says ExecuteReader. What does it mean ?

Internally, the Fill method uses ExecuteReader.
When I get this error, is there a way for me to loop and wait until there is
an open and available Connection ?
Thank you.
Dim cmd As New OleDb.OleDbComm and
Dim da As OleDb.OleDbData Adapter
Dim ds As DataSet
With cmd
.Connection = ConnectionDemoO LE

Where is ConnectionDemoO LE defined? Is this a global variable? If
so, then try creating a new connections instead of using an existing
variable. Generally, it is better to create a connection, use it, and
then close it rather than to open a connection and keep it around for
a long time.

Chris

Apr 18 '07 #8

This thread has been closed and replies have been disabled. Please start a new discussion.

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by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
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5679
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes...
0
3806
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
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1141
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...

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