I'm new to ADO.NET--trying to make the switch from ADO, which I've been using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New SqlConnection(S QLConnectionStr ing)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE MR_StudentNumbe r = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now 'CreatedBy
End If
NewRecord.Rows( 0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Accep tChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes don't persist. How can I update the database with my changes?
7  1515 
Kevin,
The point is here the dataadapter, that has to have commands, that includes
the working of the update, delete and insert as is used by SQL. If you have
made the dataadapter in any generic way, then the problem is probably alone
in your acceptchanges.
It means something as: "set the rows in the dataadapter updated in the
database and accept the changes as done correct". Therefore those rows will
never been updated in your code. (The dataadapter does this automaticly for
you so there is not really need for that).
Cor
"Kevin" <kmahoney@nospa m_fireacademy.o rgschreef in bericht
news:kb******** *************** *********@4ax.c om...
I'm new to ADO.NET--trying to make the switch from ADO, which I've been
using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New
SqlConnection(S QLConnectionStr ing)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE
MR_StudentNumbe r = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now
'CreatedBy
End If
NewRecord.Rows( 0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Accep tChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes
don't persist. How can I update the database with my changes?
So, what does that mean in terms of code? Am I missing something or coding something incorrectly?
On Thu, 29 Nov 2007 22:00:19 +0100, "Cor Ligthert[MVP]" <no************ @planet.nlwrote :
>Kevin,
The point is here the dataadapter, that has to have commands, that includes
the working of the update, delete and insert as is used by SQL. If you have
made the dataadapter in any generic way, then the problem is probably alone
in your acceptchanges.
It means something as: "set the rows in the dataadapter updated in the
database and accept the changes as done correct". Therefore those rows will
never been updated in your code. (The dataadapter does this automaticly for
you so there is not really need for that).
Cor
"Kevin" <kmahoney@nospa m_fireacademy.o rgschreef in bericht
news:kb******* *************** **********@4ax. com...
>I'm new to ADO.NET--trying to make the switch from ADO, which I've been
using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New
SqlConnection( SQLConnectionSt ring)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE
MR_StudentNumb er = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now
'CreatedBy
End If
NewRecord.Rows (0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Acce ptChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes
don't persist. How can I update the database with my changes?
Kevin,
Don't call the data table's AcceptChanges method before calling the data
adapter's Update method.
Kerry Moorman
"Kevin" wrote:
So, what does that mean in terms of code? Am I missing something or coding something incorrectly?
On Thu, 29 Nov 2007 22:00:19 +0100, "Cor Ligthert[MVP]" <no************ @planet.nlwrote :
Kevin,
The point is here the dataadapter, that has to have commands, that includes
the working of the update, delete and insert as is used by SQL. If you have
made the dataadapter in any generic way, then the problem is probably alone
in your acceptchanges.
It means something as: "set the rows in the dataadapter updated in the
database and accept the changes as done correct". Therefore those rows will
never been updated in your code. (The dataadapter does this automaticly for
you so there is not really need for that).
Cor
"Kevin" <kmahoney@nospa m_fireacademy.o rgschreef in bericht
news:kb******** *************** *********@4ax.c om...
I'm new to ADO.NET--trying to make the switch from ADO, which I've been
using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New
SqlConnection(S QLConnectionStr ing)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE
MR_StudentNumbe r = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now
'CreatedBy
End If
NewRecord.Rows( 0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Accep tChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes
don't persist. How can I update the database with my changes?
Then it stops on the line 'dataAdapter.Up date(NewRecord) ' and I get an error:
Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
On Thu, 29 Nov 2007 15:36:00 -0800, Kerry Moorman <Ke**********@d iscussions.micr osoft.comwrote:
>Kevin,
Don't call the data table's AcceptChanges method before calling the data
adapter's Update method.
Kerry Moorman
"Kevin" wrote:
>So, what does that mean in terms of code? Am I missing something or coding something incorrectly?
On Thu, 29 Nov 2007 22:00:19 +0100, "Cor Ligthert[MVP]" <no************ @planet.nlwrote :
>Kevin,
The point is here the dataadapter, that has to have commands, that includes
the working of the update, delete and insert as is used by SQL. If you have
made the dataadapter in any generic way, then the problem is probably alone
in your acceptchanges.
It means something as: "set the rows in the dataadapter updated in the
database and accept the changes as done correct". Therefore those rows will
never been updated in your code. (The dataadapter does this automaticly for
you so there is not really need for that).
Cor
"Kevin" <kmahoney@nospa m_fireacademy.o rgschreef in bericht
news:kb******* *************** **********@4ax. com...
I'm new to ADO.NET--trying to make the switch from ADO, which I've been
using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New
SqlConnection( SQLConnectionSt ring)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE
MR_StudentNumb er = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now
'CreatedBy
End If
NewRecord.Rows (0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Acce ptChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes
don't persist. How can I update the database with my changes?
Kevin,
The data adapter needs a valid UpdateCommand, InsertCommand and
DeleteCommand, in addition to the SelectCommand that you provided.
You can either provide the commands yourself or use a SQLCommandBuild er,
which will provide the commands for you, assuming a very simple situation.
If you look up SQLDataAdapter in the help system and then look up the data
adapter's UpdateCommand property you will see examples of how to do this.
Kerry Moorman
"Kevin" wrote:
Then it stops on the line 'dataAdapter.Up date(NewRecord) ' and I get an error:
Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
On Thu, 29 Nov 2007 15:36:00 -0800, Kerry Moorman <Ke**********@d iscussions.micr osoft.comwrote:
Kevin,
Don't call the data table's AcceptChanges method before calling the data
adapter's Update method.
Kerry Moorman
"Kevin" wrote:
So, what does that mean in terms of code? Am I missing something or coding something incorrectly?
On Thu, 29 Nov 2007 22:00:19 +0100, "Cor Ligthert[MVP]" <no************ @planet.nlwrote :
Kevin,
The point is here the dataadapter, that has to have commands, that includes
the working of the update, delete and insert as is used by SQL. If you have
made the dataadapter in any generic way, then the problem is probably alone
in your acceptchanges.
It means something as: "set the rows in the dataadapter updated in the
database and accept the changes as done correct". Therefore those rows will
never been updated in your code. (The dataadapter does this automaticly for
you so there is not really need for that).
Cor
"Kevin" <kmahoney@nospa m_fireacademy.o rgschreef in bericht
news:kb******** *************** *********@4ax.c om...
I'm new to ADO.NET--trying to make the switch from ADO, which I've been
using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New
SqlConnection(S QLConnectionStr ing)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE
MR_StudentNumbe r = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now
'CreatedBy
End If
NewRecord.Rows( 0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Accep tChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes
don't persist. How can I update the database with my changes?
Kevin,
Beside the commandbuilder you can use the generic tools in VS, a pity is,
that every version has his own so first tell us what version you are using.
To make the update, insert and delete with hand is not easy, for the most
part it is SQL script. (Now you see maybe the need for the LINk to sQl)
there shall be made an other meaning for the characters, however in practise
it is this.
LINQ is not using datasets by the way, it uses DBML which are an other kind
of classes, however as most things, based on the same principles done in
another way.
Cor
I solved the problem myself by adding the following line:
Dim CmdBuilder As New SqlCommandBuild er = New SqlCommandBuild er (dataAdapter)
On Thu, 29 Nov 2007 14:29:37 -0500, Kevin <kmahoney@nospa m_fireacademy.o rgwrote:
>I'm new to ADO.NET--trying to make the switch from ADO, which I've been using in my VB2005 apps up until now. Here's what I have:
Sub Save_Record()
Dim OldRecord as DataTable
Dim NewRecord as DataTable
Using testConnection As SqlConnection = New SqlConnection(S QLConnectionStr ing)
Dim testCommand As SqlCommand = testConnection. CreateCommand()
testCommand.Com mandText = "SELECT * FROM MasterRoster WHERE MR_StudentNumbe r = '" & txtStudentNumbe r.Text & "'"
Dim dataAdapter As New SqlDataAdapter( testCommand)
dataAdapter.Fil l(OldRecord)
dataAdapter.Fil l(NewRecord)
If NewRecord.Rows. Count = 0 Then
NewRecord.Rows. Add()
NewRecord.Rows( 0).Item(53) = sysUser & " " & Now 'CreatedBy
End If
NewRecord.Rows( 0).Item(0) = txtLName.Text
NewRecord.Rows( 0).Item(1) = txtFName.Text
NewRecord.Rows( 0).Item(2) = txtMI.Text
NewRecord.Accep tChanges()
dataAdapter.Upd ate(NewRecord)
'Code to compare OldRecord to NewRecord cut from here
End Using
End Sub
Comparing the two datatables shows the changes I made, but the changes don't persist. How can I update the database with my changes?
This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: John Kandell |
last post by:
Hi,
I posted this in the asp.net group, but didn't get a response. Maybe someone
here can help me with this...
---
Would someone be able to shed some light on what is the cost of saving a
DataTable to session vs saving a custom object of the same data.
|
by: Steven Thomas |
last post by:
Can some one help me find a code snipit for saving the contents of a
data set to a comma seperated file?
I have created a web service in asp.net that will read the data from a
AS/400 DB2 database via a OleDB connection. Then I create the
dataset, Now what do I do
Here is the function now
------------------------------------------------
Public Function GetTicketData() As DataSet
'Public Function GetTicketData(ByVal varbpno, ByVal
|
by: Jay Walker |
last post by:
I created a custom DataGridColumn based on Marcie Robillard's MSDN
Article:
Creating Custom Columns for the ASP.NET Datagrid
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/creatingcustomcolumns.asp
The problem I am having is that the data in the custom datagridcolumn
is not saved to viewstate and after postback, the column does not
contain data.
|
by: Mark |
last post by:
Hi -
I've a data table that I want to save to an external Access database.
I'm interested in sample code that would perform this save.
Thanks, Mark
(VB.NET, .Net framework 1.0)
|
by: Jim Andersen |
last post by:
Hi,
I want to make a backup of some data from an SQL server. The backup should
be saved as an Excell file (or similar, csv or xml...)
So I create a datatable and select the data from SQL server and manipulate
it a bit. No problem.
But how do I save it on the Client PC ?
Do I have to go through an intermediary step of saving it on the server and
then transferring the file (somehow) and deleting the file on the server.
| | |
by: arun.hallan |
last post by:
Hi,
I have a datagrid whose datasource is a datatable which is saved to
viewstate on page_load.
I also have a cached string which handles what is shown on the
rowfilter of the dataview of this datatable.
I also have a cached string that holds the way the dataview is sorted.
|
by: Magnus |
last post by:
I'm testing walkthrough saving data to a Database (Multiple Tables).
http://msdn2.microsoft.com/en-us/library/4esb49b4(VS.80).aspx
In the famous Customer/Order example, I'm getting referential integrity
problems "The INSERT statement conflicted with the FOREIGN KEY
constraint..." if the identity/primary key column is "out of sync" with the
identity value in the database. I can easily acheive this f.ex. by pressing
add new record,...
|
by: vacuit |
last post by:
Visual Basic 2005
I want to save a copy of a datatable (that the user has changed) with a new name back to the database (Access)
I have this code to save a copy with a new name to the dataset...how do I then update the database (without changing the original datatable)? Essentially I want to add a new datatable to the database.
Dim dt As New DataTable
dt = MyDataSet.OriginalDataTable.Copy
dt.TableName = mytextbox.text...
|
by: Lucvdv |
last post by:
This would better be described by 'serialization' than 'interop', but I
didn't find a newsgroup that seems closer on topic.
The problem in a few words: I save data with DataSet.WriteXML, but I get
different data back when I read it later with DataSet.ReadXml.
More detail:
|
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...
|
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...
| | |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: conductexam |
last post by:
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();...
|
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...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
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
| | |
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |
