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by: Mountain Bikn' Guy |
last post by:
When one gets a row from a database (ie, a DataTable), the row contains a
typed value in each column. How is this typically implemented behind scenes.
I want to build this functionality myself. The reason I want to do this is
because I need an in-memory table without any of the overhead of a DataSet
or DataTable.
Thanks!
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by: Stefan Turalski \(stic\) |
last post by:
Hi,
I'm wondering if there is a way to send a method parametrs by ref when
DataTabel is a type of this value ?
I done some sort of select over DataTable columns, just by removing them
froma table is each of them isn't on a stirng, but right no I have to do
it in a wat of:
1. passing DataTable to method (lets call it SelectOverDataTabel)
2. declare a local (in SelectOver...) DataTable, inicialize it with my value
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by: Mico |
last post by:
I would be very grateful for any help with the following problem:
I use a DataAdapter to fill a DataSet in the Page_Load method.
Later, I use this DataSet to construct a DataTable, then create a
DataRow and search through the DataTable for a specific row. Having
found the row, I intend to display the various fields in some text
boxes. This is all triggered from a dropdownlist. The code for this
is shown below:
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by: Young J. Putt |
last post by:
I've got a list box bound to a Datatable, like this:
lstProjects.DataSource = m_oProjectSet.DataTable
lstProjects.DisplayMember = "ProjectDesc"
lstProjects.ValueMember = "ProjectID"
I want to pass the ProjectID value (integer) of the selected item in
lstProjects to another function.
I assumed I could reference the integer value of the ProjectID column as
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by: Fred Nelson |
last post by:
Hi:
I have created a datatable and I'm able to access it by key values.
I need to be able to go to the "top" of the datatable and process
records sequentially until they are completed.
I can't figure out the command to set me to the top or "beginning" and
then read. (datatable.select?)
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by: Doug Bell |
last post by:
Hi,
I am having problems trying to create a (temporary) DataTable from a
selection from a DataGrid (dgOrders).
dtOrdDetails is declared as a Public DataTable
Sub is:
Dim stFilter as String
Dim OrdersRows() as DataRow
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by: Shell |
last post by:
As i am passing datatable from webservice to UI
My Web Method is as follows :-
Public Function GetData() As DataTable
Dim objData As New MyClass
Return objData.GetData()
End Function
In my Web Reference i am getting reference as (Partial Class name)
Partial Class GetDataResponseGetDataResult
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by: oopman2002 |
last post by:
I have created a DataSet DataTable which is comprised of data from a
number of sources. The resultant datatable is about 500,000 records and
writing them out one at a time takes forever. Does anyone have some
example code or tell me how to dump a datatable to Access.
One problem is that the datatable structure changes and I would like to
create a generic method, which scans the datatable column types and
builds the Access table on the...
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by: cj |
last post by:
I have a program to display queries to a SQL db. I type my query in a
textbox and click a button and the results display in a datagrid. I
could use either dataset or datatable to read the data in then I make
the datagrid.datasource = myds.Tables(0) or mydt. Now what I want is to
be able to change the query and click the button again and get the new
results. I can use clear() to clear the data from a ds/dt but I need
the structure gone...
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by: =?Utf-8?B?anAybXNmdA==?= |
last post by:
I've got a routine that builds a table using different queries, different SQL
Tables, and adding custom fields.
It takes a while to run (20 - 45 seconds) so I wrote a thread to handle the
table population.
Whenever I call the thread, I pass it a structure containing the table and a
few other parameters. The table goes in as a reference, but the other items
are passed normally.
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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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 launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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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 instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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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 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 |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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