VS 2008 Filling DataTable With DataReader?
Feb 19, 2010I use firebird server for 2 years and I used this code
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Filling ListView With DataReader?
Mar 11, 2010I am trying to fill a listView with data of a DataReader, this is the
Dim CMD As New OleDb.OleDbCommand
CMD.Connection = CN
CMD.CommandText = "select Name, DNI, Sum(Price) from ORDERS group by name, dni"
Dim miDataReader As OleDb.OleDbDataReader
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.net - Fill DataTable From DataReader Row By Row
Aug 25, 2010i want to fill a Datatable with a Datareader row by row but get an exception because the reader's columns have a different order than the Datatable's columns.
Why and how does a Datatable loads itself with a Datareader correctly, even so it has a column collection with different order?
I need to calculate values for every row so i dont want to load the Datatable completely but row for row. It has 25 columns so i dont want to set it all manually.
There must be a chance to load/fill/add a new row from a datareader without having the same column order(reader.GetSchemaTable?).
Following is what i have but what doesnt work:
Using reader As System.Data.SqlClient.SqlDataReader = command.ExecuteReader
'next line works(configInfo.DataSource is a Datatable)but is inappropriate
configInfo.DataSource.Load(reader)
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How To Convert A Datareader To Datatable
Feb 23, 2012I have a question about converting a datareader to a datatable. In my code, I have a datareader created in one class and passed to another class that I want to convert it to a datatable.
When I do this, it does not seem to work, as the table remains empty. If I do the conversion in the same function, it works fine.
Its only when I pass the datareader to another function that it stops working. Is this because the dr is closed or something? How do I overcome this problem? Any help would be great.
Load DataReader Into DataTable?
Jul 7, 2009[code]...Load DataReader into DataTable
This code return an error, and with breakpoint i get this error on the items line:
"Item = In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user."
VS 2008 Filling DataTable "Reading From Stream Failed"?
May 26, 2011Heres the InnerException:{"Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall."}Stack Trace:
" at MyNetworkStream.HandleOrRethrowException(Exception e) at MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count) at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count) at
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.Net System.OutOfMemoryException Filling A Datatable?
Sep 24, 2009I need to extract data from a .dbf file and transform it into xml. I wrote a routine that does it just fine. However now we are encountering very large .dbf files - like 2GB +. And this code throws an OutOfMemoryException on those files.
Public Function GetData() As DataTable
Dim dt As New DataTable(Name)
Dim sqlcommand As String= "Select * From MyTable"
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Filling Datatable With DataGridView Data In VB/C# .NET?
Dec 2, 2010How can I fill Datatable with DataGridView data (VB/C# .NET)?
View 1 RepliesIncorrect Syntax Error When Filling Datatable?
Sep 8, 2009Dim adapter As New SqlDataAdapter("SELECT price, product FROM" & txtstore.Text & "WHERE barcode='" & txtbarcode.Text & "'", con)
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I dont the msgbox to be sure that correct string is being passed to it and it is.. But I got an error at the "adapter.fill(txtstore.text)" saying Incorrect syntax at 'barcode'.
.net - SQLDataAdapter Filling Datatable With Primary Key Produces Error And Exits Sub?
Aug 12, 2011Ok so this is going to take some explaining. The process I am trying to do is grab data from a table function in SQL and then fill a dataset with the returned values. I then have to run this query twice more to query an alternative number table. Then add to the same table as the previous queries.This needs to be as fast as possible, so I am currently using an adapter.fill to populate the datasets and then a dataset.merge to put them all into one table.
The problem is the query can return duplicates which waste time and space, because of this I made column 3(part_ID) the primary key to stop duplicates.When this is run with the .merge it quits at the first instance of a duplication and doesn't continue with the population.
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Sql - Invalid Cast Exception When Filling Datatable Wth Table Adaptor
Jan 13, 2011I am using VB.NET 2010 (Visual Basic 2010 Express) on a WPF-based project. I am also using the SQL Server Express built-in to Visual Basic 2010 express.I have just about finished refining my code for hooking up my wpf-based form to an existing SQL database (agentroster.sdf). I have a global data source (AGENT_ROSTER) connected to this database. Connections are confirmed to work properly.This is the first part of the code I'm using, irrelevant code omitted,
Dim table_adaptor As New AGENT_ROSTERTableAdaptors.AGENT_ROSTERTableAdaptor
Dim roster_table As New DataTable("roster_table")
Dim rowposition As Integer
[code]....
how do I fill roster_table with table_adaptor (or alternate method)?
VS 2010 : Create Multi-dimensional Array From Datareader From Datareader?
Feb 20, 2012I have an SQL statement like:
SELECT FNAME, LNAME, CITY from EMPLOYEE
How do I create a multi-dimensional array from a datareader which should store values like:
John, Doe, LA
Mike, Johnson, PASADENA
Freddy, Kruger, Long Beach
Datareader - Error - "there Is A Datareader Associate With This Connection That Need To Be Closed"
Aug 17, 2009I have a problem with my project. here is the problem:
My code for login is as follows:
dim conn as SqlConnection = New SqlConnection("Data Source.................)
dim cmd as SqlCommand = New SqlCommand("Loguser",conn)
cmd.CammandType = CommandType.StoredProcedure
[CODE]...
Now the error i get is that "there is a datareader associate with this connection that need to be closed"
VS 2008 Using A DataReader
Jan 27, 2010I am working on a project which requires me to connect to a MySQL database. From there I query the database and need to do work on the returned values.
I can query the database just fine. However, now I need to do work on the results. The two columns returned are user_name and user_password. The rows are the user accounts. I would like to take my query results and put each column into its own arrary().
[code..]
Instead of writing the results to the console, I would like to write each column to an individual array. Is there an easier way to accomplish this task? Or, what is the code I must place within the loop to do this.
VS 2008 Datareader SQL Express?
Oct 15, 2010I am doing the basic reading form one table,.it is opening the connection,no problems.i got 5 rows in Categories table with two columns .i got some data as well.using datareader i am trying to read the data.It is not going into while loop
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VS 2008 Use Two Datareader In One Loop?
Feb 7, 2010I m trying to use two datareader in same loop but its not working. Here is the error and code below Error line: DR1 = MyCommand.ExecuteReader()Error message: There is already an open DataReader associated with this Command which must be closed first.
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VS 2008 DataReader Error In Looping
Mar 29, 2009[code]I am facing difficulty in coding when intRow loop for the 2nd round. Error message "There is already an open DataReader associated with this Command which must be closed " appear in the above red highlight vb.net code.
View 6 RepliesVS 2008 Fill Array With DataReader?
Jan 11, 2011How can I fill this Percentage array with Sql data reader..
Dim StudentID As Integer = Me.ComboBox1.SelectedValue
Dim Percentage() As Integer
Dim con As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=D:Database
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VS 2008 Fill ComboBox With DataReader?
Mar 16, 2010The code works fine, but I don't know if is necessary while sentence, maybe there is another option..
Dim CMD As New OleDb.OleDbCommand
CMD.Connection = otraConexion
CMD.CommandText = "SELECT * from procedencias"
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[2008] Populate Datagridview Using A Datareader?
May 14, 2008This is some of my code. But how do I populate a datagridview using the datareader.
Dim strSQL As String = "SELECT peopleid,firstnames,surname FROM people;"
Dim cmd As New MySqlCommand(strSQL, con)
'cmd.Parameters.AddWithValue("Parameter1", strName)
Dim reader As MySqlDataReader = cmd.ExecuteReader
and how can I handle null field values.
VS 2008 - DataReader In Loop Through Text File
Apr 28, 2011I've wrote a program designed to loop through a text file containing email addresses and unsubscribe said email addresses in our CRM system. I'm having a problem with the following code...
Do While obj_filereader2.Peek() <> -1
strcuremail = obj_filereader2.ReadLine()
Dim dbqCustNo As String = "SQL CODE HERE - SELECT CUSTOMER NUMBER"
Dim exeCustNo As New SqlCommand()
Dim SQLdr As SqlDataReader
exeCustNo.Connection = ConnStr
[Code] ......
The program is falling over when trying to execute the update commands during the datareader loop, with the fabled 'There is already an open DataReader associated with this Command...' error. This program has evolved as I've found problems/better ways of working, so it might be a case of myself just not using the DataAdapter right - I'm guessing I should be using a function of the open DataReader rather than the ExecuteNonQuery command.
VS 2008 - DataReader While Loop (Hang After Few Minutes)
Sep 9, 2009How 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
VS 2008 : Creating Own DataReader Like TCP Client/Server?
Jun 2, 2010I'm not even sure where to start. I would like to create something like the ADO DataReader but that works in a TCP Client/Server scenario.Basically, in the TCP Client, I want to be able to call a certain command in the TCP Server which will return a DataReader like object, which I can then iterate through such as:
while dr.Read from the client. In each loop, I would parse out the various fields as in a normal DataReader.The reason I want to do this is to gain the inherent efficiency of the DataReader object since it doesn't first load ALL of the data. To my understanding, the typical TCP Client/Server setup using streams, would first load all of the data on the server, then transport ALL of that data to the client for processing. I want to avoid that, and just stream the data as the client requests through the Read() command which means the connection will remain open to the server while the Read() command is being issued by the client, or until explicitly closed by the client.
VS 2008 Recursion Failing With Command/DataReader Objects Already Open
Jun 26, 2009I'm trying to put together a quick example for another thread about treeviews, and I'm getting a problem when I have a recursive routine, getting the message.
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)
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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.
VS 2008 Nesting A Datatable Inside A Datatable?
Mar 16, 2011Is there a way to nest a datatable into another datatable? I know you can do this with gridviews but thats not what I'm looking for.
Also, I don't want to merge the datatables. What I'm trying to do is have a datatable with 2 columns and each column containing different datatables.
VS 2008 Filling A Combo Box
Feb 20, 2011i'm finishing up on my A2 Computing project now and am trying to make a few improvements. first of all, i want to fill a combo box with a list of variables from my database, so when they enter a new record on my vb form, they will have an option to choose from..
my attempt at coding:
Do
ComboBox.ObjectCollection.Equals(ds.Tables("TTDB").Rows(inc).Item("GroupID"))
inc = inc + 1
Loop Until inc = MaxRows
VS 2008 Filling A Datagrid
Jul 7, 2009I am trying to fill my datagridview but I got an error, I probably missed out something in my code. The dataset gets filled allright, only when it comes to the line:[code]
View 2 Replies[2008] Filling Form With Vb?
Jan 29, 2009its possible to develop an app that can open firefox or ie and fill form and submit... for example vb logging into my gmail a/c without any manual input!
View 4 RepliesPre-filling Adobe Form Using .net (vs 2008)?
Mar 1, 2011I have written a 'windows' app, that uses some Adobe 'forms' that I created using Adobe Pro 9.0 they are certificates of completion. I can open them, but I want to pre-fill the fields in the form before opening them. Such that, all the person can do, is to print the form with their name/date/other-info.which 'references' I need to add? which properties to set? etc.?
View 1 RepliesVB 2008 Webbrowser Filling IFrames?
Mar 11, 2010I'm new to this forum and was wondering if somebody could help me out on the visual basic 2008 webbrowser filling iFrames.Here is an example iFrame below
<TD class=controlbar><TEXTAREA style="WIDTH: 500px; DISPLAY: none; HEIGHT: 350px" dir=ltr id=vB_Editor_001_textarea tabIndex=1 rows=10 cols=60 name=message>