DataReader Read() Command Hangs For Up To 30 Minutes
Jun 24, 2010
I have a datareader pulling data from Oracle. It all works fine but I have one issue. When I issue the read() command ala;
While dr.Read
Column1List.Add(dr.GetValue(0).ToString().Replace(vbCrLf, ""))
Column2List.Add(dr.GetValue(1).ToString().Replace(vbCrLf, ""))
[Code]....
When the code hits that " While dr.Read" line it will hang there for up to 30 minutes which is just a ridiculous amount of time to advance to the next record, which is what the documentation says is all that is happening here. It only occurs the first time it hits that line...once it gets past it once, it does not hang again as it goes through it's while loop.
How come my datareader looping at the while loop line it become totally no response and without error eventhough I got use the try catch error catching... it only will hang on after few minute... after few loop. Is it the data reader got time out limit?? If exceed the limit it will no response..? Inside my while loop it do a lot of transaction and each transaction also take quite long time... it will affect?
myCommand = New MySqlCommand("SELECT * FROM stk_cus_inv_hd WHERE DocType=?DocType;", conn1) myCommand.Parameters.AddWithValue("?DocType", "CS") myCommand.CommandTimeout = 99999 myReader = myCommand.ExecuteReader While myreader.read <<---- it jam at here and totally no response my coding... but my interface is clickable... my lot of work here... End While
I have two datareaders: [Code] When i'm running the code i get this error in the highlighted line: "There is already an open DataReader associated with this Command which must be closed first." I used different variables in both readers, why do i get this error? do i have to open a new sqlConnection for this task?
and in class that starts new thread started every time users change some data(very often)
[Code]...
1. other parts of application are targeting other SQL server...just this adapter is updating only one row(table has two columns, some id and last time any of users changed something.
This reader is done in the form load event and is the very first thing done so I don't understand why it's telling me there is an open DataReader. I've also set MARS=True in my connection string so obviously it is something else.Here's my code and like I said the routine is called at the top of the form load event. The error occurs on the
I get the following message "There is already an open DataReader associated with this Command which must be closed first." Is the insert statement the most effiecient way to write to the table row by row?
Dim comment As String Dim cnx As Data.SqlClient.SqlConnection = SqlCnx.SourceDB Dim cmd As New Data.SqlClient.SqlCommand("select number,comment from [Comments]", cnx) Dim daComments As New SqlClient.SqlDataAdapter Dim bsComments As New BindingSource cmd.CommandTimeout = "360" cmd.CommandType = CommandType.Text cnx.Open()
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Quote:
There is already an open DataReader associated with this Command which must be closed first.
I'm a tad confused as I am explicitly creating a new command every time through the loop, so I'm not sure (unless its something ADO is doing behind the scenes) how the datareaders higher up the tree are interfering.
Here's my code :
Private Sub SetupChildren(ByVal ParentID As Integer, ByRef ParentNode As TreeNode) Dim MyCommand As New SqlCommand("SELECT * FROM Groups WHERE ParentGroup=@ParentGroup", m_myConnection)
[Code]...
Obviously I could close the data reader down before calling the next level of recursion but it would prevent the code continuing the loop at the current level when it had finished processing children.
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Here is the code:
Using cmd As New SqlCommand("doGetAllSizesForProduct", oConn) cmd.CommandType = CommandType.StoredProcedure cmd.Parameters.AddWithValue("@id", CType(Request.QueryString("id"), Integer))
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[CODE]...
Now the error i get is that "there is a datareader associate with this connection that need to be closed"
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