I have a function which return datareader
Public Shared Function ReturnDReader(B yVal query As String) As
OleDbDataReader
Dim Connection_Stri ng As String =
System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
Dim conn As OleDbConnection
Dim cm As OleDbCommand
Dim dr As OleDbDataReader
Try
conn = New OleDbConnection (Connection_Str ing)
cm = New OleDbCommand(qu ery, conn)
conn.Open()
dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
Return dr
Catch ExceptRaise As OleDbException
'ExceptRaise.Me ssage()
Finally
cm.Dispose()
End Try
End Function
I call this function like this from Page_Load method
Dim d As Data.OleDb.OleD bDataReader
d = CodeMaster.Func .ReturnDReader( "select * from employess")
DataList1.DataS ource = d
DataList1.DataB ind()
d.Close()
But for some reason after closing the datareader, the database is not
closing. (I'm using Access and record locking file is still there)
How do I resolve this ? [If the function's code is copied to the Page_Load
method then everything works fine, but problem occurs when this function is
in external class. the database doesnt close]
7  4128 
Close the connection:
conn.Close();
Eliyahu
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eB******** ******@tk2msftn gp13.phx.gbl... I have a function which return datareader
Public Shared Function ReturnDReader(B yVal query As String) As
OleDbDataReader
Dim Connection_Stri ng As String =
System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
Dim conn As OleDbConnection
Dim cm As OleDbCommand
Dim dr As OleDbDataReader
Try
conn = New OleDbConnection (Connection_Str ing)
cm = New OleDbCommand(qu ery, conn)
conn.Open()
dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
Return dr
Catch ExceptRaise As OleDbException
'ExceptRaise.Me ssage()
Finally
cm.Dispose()
End Try
End Function
I call this function like this from Page_Load method
Dim d As Data.OleDb.OleD bDataReader
d = CodeMaster.Func .ReturnDReader( "select * from employess")
DataList1.DataS ource = d
DataList1.DataB ind()
d.Close()
But for some reason after closing the datareader, the database is not
closing. (I'm using Access and record locking file is still there)
How do I resolve this ? [If the function's code is copied to the Page_Load
method then everything works fine, but problem occurs when this function
is in external class. the database doesnt close]
Hi Arsalan.
I think it's a bad idea to return DataReader.
That is because the DataReader holds the connection open,
and you depend on the caller to close it.
I suggest you make a function that returns a DataView.
Sharon.
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eB******** ******@tk2msftn gp13.phx.gbl... I have a function which return datareader
Public Shared Function ReturnDReader(B yVal query As String) As
OleDbDataReader
Dim Connection_Stri ng As String =
System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
Dim conn As OleDbConnection
Dim cm As OleDbCommand
Dim dr As OleDbDataReader
Try
conn = New OleDbConnection (Connection_Str ing)
cm = New OleDbCommand(qu ery, conn)
conn.Open()
dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
Return dr
Catch ExceptRaise As OleDbException
'ExceptRaise.Me ssage()
Finally
cm.Dispose()
End Try
End Function
I call this function like this from Page_Load method
Dim d As Data.OleDb.OleD bDataReader
d = CodeMaster.Func .ReturnDReader( "select * from employess")
DataList1.DataS ource = d
DataList1.DataB ind()
d.Close()
But for some reason after closing the datareader, the database is not
closing. (I'm using Access and record locking file is still there)
How do I resolve this ? [If the function's code is copied to the Page_Load
method then everything works fine, but problem occurs when this function
is in external class. the database doesnt close]
Good idea buddy, but you cannot close the connection and read data from
DataReader [please see the code], and as connection object is out of scope,
you cannot close it through Page_Load event.
"Eliyahu Goldin" <re************ *@monarchmed.co m> wrote in message
news:eE******** ******@TK2MSFTN GP09.phx.gbl... Close the connection:
conn.Close();
Eliyahu
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eB******** ******@tk2msftn gp13.phx.gbl... I have a function which return datareader
Public Shared Function ReturnDReader(B yVal query As String) As
OleDbDataReader
Dim Connection_Stri ng As String =
System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
Dim conn As OleDbConnection
Dim cm As OleDbCommand
Dim dr As OleDbDataReader
Try
conn = New OleDbConnection (Connection_Str ing)
cm = New OleDbCommand(qu ery, conn)
conn.Open()
dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
Return dr
Catch ExceptRaise As OleDbException
'ExceptRaise.Me ssage()
Finally
cm.Dispose()
End Try
End Function
I call this function like this from Page_Load method
Dim d As Data.OleDb.OleD bDataReader
d = CodeMaster.Func .ReturnDReader( "select * from employess")
DataList1.DataS ource = d
DataList1.DataB ind()
d.Close()
But for some reason after closing the datareader, the database is not
closing. (I'm using Access and record locking file is still there)
How do I resolve this ? [If the function's code is copied to the
Page_Load
method then everything works fine, but problem occurs when this function
is in external class. the database doesnt close]
Thanks,
"Sharon" <sh****@void.nu ll> wrote in message
news:uk******** ******@TK2MSFTN GP09.phx.gbl... Hi Arsalan.
I think it's a bad idea to return DataReader.
That is because the DataReader holds the connection open,
and you depend on the caller to close it.
I suggest you make a function that returns a DataView.
Sharon.
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eB******** ******@tk2msftn gp13.phx.gbl... I have a function which return datareader
Public Shared Function ReturnDReader(B yVal query As String) As
OleDbDataReader
Dim Connection_Stri ng As String =
System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
Dim conn As OleDbConnection
Dim cm As OleDbCommand
Dim dr As OleDbDataReader
Try
conn = New OleDbConnection (Connection_Str ing)
cm = New OleDbCommand(qu ery, conn)
conn.Open()
dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
Return dr
Catch ExceptRaise As OleDbException
'ExceptRaise.Me ssage()
Finally
cm.Dispose()
End Try
End Function
I call this function like this from Page_Load method
Dim d As Data.OleDb.OleD bDataReader
d = CodeMaster.Func .ReturnDReader( "select * from employess")
DataList1.DataS ource = d
DataList1.DataB ind()
d.Close()
But for some reason after closing the datareader, the database is not
closing. (I'm using Access and record locking file is still there)
How do I resolve this ? [If the function's code is copied to the
Page_Load
method then everything works fine, but problem occurs when this function
is in external class. the database doesnt close]
Take connection object out of that function scope.
Eliyahu
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eF******** ******@TK2MSFTN GP09.phx.gbl... Good idea buddy, but you cannot close the connection and read data from
DataReader [please see the code], and as connection object is out of
scope, you cannot close it through Page_Load event.
"Eliyahu Goldin" <re************ *@monarchmed.co m> wrote in message
news:eE******** ******@TK2MSFTN GP09.phx.gbl... Close the connection:
conn.Close();
Eliyahu
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eB******** ******@tk2msftn gp13.phx.gbl... I have a function which return datareader
Public Shared Function ReturnDReader(B yVal query As String) As
OleDbDataReader
Dim Connection_Stri ng As String =
System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
Dim conn As OleDbConnection
Dim cm As OleDbCommand
Dim dr As OleDbDataReader
Try
conn = New OleDbConnection (Connection_Str ing)
cm = New OleDbCommand(qu ery, conn)
conn.Open()
dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
Return dr
Catch ExceptRaise As OleDbException
'ExceptRaise.Me ssage()
Finally
cm.Dispose()
End Try
End Function
I call this function like this from Page_Load method
Dim d As Data.OleDb.OleD bDataReader
d = CodeMaster.Func .ReturnDReader( "select * from employess")
DataList1.DataS ource = d
DataList1.DataB ind()
d.Close()
But for some reason after closing the datareader, the database is not
closing. (I'm using Access and record locking file is still there)
How do I resolve this ? [If the function's code is copied to the
Page_Load
method then everything works fine, but problem occurs when this
function is in external class. the database doesnt close]
Good suggestion but coding everything would be tedious, is there any
alternate way to do it ??
"Eliyahu Goldin" <re************ *@monarchmed.co m> wrote in message
news:OW******** ******@TK2MSFTN GP09.phx.gbl... Take connection object out of that function scope.
Eliyahu
"Arsalan" <ar***********@ hotmail.com> wrote in message
news:eF******** ******@TK2MSFTN GP09.phx.gbl... Good idea buddy, but you cannot close the connection and read data from
DataReader [please see the code], and as connection object is out of
scope, you cannot close it through Page_Load event.
"Eliyahu Goldin" <re************ *@monarchmed.co m> wrote in message
news:eE******** ******@TK2MSFTN GP09.phx.gbl... > Close the connection:
>
> conn.Close();
>
> Eliyahu
>
> "Arsalan" <ar***********@ hotmail.com> wrote in message
> news:eB******** ******@tk2msftn gp13.phx.gbl...
>> I have a function which return datareader
>>
>> Public Shared Function ReturnDReader(B yVal query As String) As
>> OleDbDataReader
>> Dim Connection_Stri ng As String =
>> System.Configur ation.Configura tionSettings.Ap pSettings("strC onn")
>> Dim conn As OleDbConnection
>> Dim cm As OleDbCommand
>> Dim dr As OleDbDataReader
>> Try
>>
>> conn = New OleDbConnection (Connection_Str ing)
>> cm = New OleDbCommand(qu ery, conn)
>>
>> conn.Open()
>>
>> dr = cm.ExecuteReade r(CommandBehavi or.CloseConnect ion)
>>
>> Return dr
>>
>> Catch ExceptRaise As OleDbException
>>
>> 'ExceptRaise.Me ssage()
>>
>> Finally
>>
>> cm.Dispose()
>>
>> End Try
>>
>> End Function
>>
>> I call this function like this from Page_Load method
>> Dim d As Data.OleDb.OleD bDataReader
>>
>> d = CodeMaster.Func .ReturnDReader( "select * from employess")
>>
>> DataList1.DataS ource = d
>>
>> DataList1.DataB ind()
>>
>> d.Close()
>>
>>
>> But for some reason after closing the datareader, the database is not
>> closing. (I'm using Access and record locking file is still there)
>>
>> How do I resolve this ? [If the function's code is copied to the
>> Page_Load
>> method then everything works fine, but problem occurs when this function > is
>> in external class. the database doesnt close]
>>
>>
>
>
> I think it's a bad idea to return DataReader. That is because the DataReader holds the connection open,
That depends upon his application really. Nothing wrong as such as long as,
as you say, it's closed correctly.
DataReader's are supposed to be fast but for small data sets, I've not found
much difference between a DataReader and a DataSet,
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