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
7  13583 
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
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
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
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
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
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
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
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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 instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
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I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: TSSRALBI |
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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 the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
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A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
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How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
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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 effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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