SQL - How To Save Data To Generate Primary Key Automatically
Dec 19, 2011
I would like someone to modify the following code to save data to generate the primary key for each record automatically. In the database,the ID column is the primary key and the Is Identity is set Yes.
Try
cmd = New SqlCommand("Insert into StudentDetails.programmes(ID,Programme,Form,AcademicYear,Class) values(@ID,@Programme,@Form,@AcademicYear,@Class)", cn)
cmd.Parameters.AddWithValue("@Programme", txtProgramme.Text)
cmd.Parameters.AddWithValue("@Form", txtForm.Text)
cmd.Parameters.AddWithValue("@AcademicYear", txtAcademicYear.Text)
cmd.Parameters.AddWithValue("@Class", txtClass.Text)
cmd.ExecuteNonQuery()
MessageBox.Show("Record successfully saved", "Saved", MessageBoxButtons.OK, MessageBoxIcon.Information)
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Dec 20, 2011
The primary key of the table is generated automatically using the Is Identity and I want to update based on the primary key. There is certainly something wrong with the following code, so I'd like someone to modify it for me.
Try
Dim qry As String
qry = "Update StudentDetails.Programmes set Programme=@Programme,Form=@Form,AcademicYear=@AcademicYear,Class=@Class where ID=ID"
cmd = New SqlCommand(qry, cn)
[code]....
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Mar 27, 2009
(VS2005 Professional)
My database's layout is as follows:
Identification (Parent table)
ID# (Primary Key, auto increase)
First Name
[Code]....
I am placing this three tables in three tabs by a tabcontrol. If I put two child tables in dataGridView in their tab, the insert(new record)/update to the tables works very well. When I put the child tables in details View, I can't get a new record updated. The problem with details view is that there is no AddressID and VehiclesID generated. In dataGridView, these IDs are automatically generated whenever a mouse enters into a cell in a row.
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May 7, 2011
What is the best way to manually generate Primary Keys in Entity Framework 4.1 Code First?
I am programming ASP.NET MVC 3 and I use a repository pattern.
I currently generate keys in a sequential order by using the [code]....
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Feb 1, 2012
I am writing an encryption application that requires a 64 bit key. I am currently using the following code to automatically generate a key.
Function GenerateKey() As String
' Create an instance of a symmetric algorithm. The key and the IV are generated automatically.
Dim desCrypto As DESCryptoServiceProvider = DESCryptoServiceProvider.Create()
[code]....
I am wanting the user to create their own key. Can I convert a user defined password (a string) into a 64 bit key that can be used?
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Feb 5, 2010
How to generate mouse click automatically in another program wind?
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Apr 27, 2009
I've run across some VB.NET code that explicitly creates three GUID constants and uses them in a class's ComClass attribute. I've written COM-aware classes in the past just by checking the "Make COM-Visible" and "Register for COM interop" options in the project options. Is this explicit code simply unnecessary, or is it doing something above-and-beyond what those two options do? Here's a snippet:
<ComClass(MenuHandler.ClassId, MenuHandler.InterfaceId, MenuHandler.EventsId)> _
Public Class MenuHandler
Public Const ClassId As String = "A2204623-A902-44d4-B524-FDFFCD176E53"
[Code].....
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Jun 22, 2010
I am making a project on cyber cafe and I want to generate username and password automatically on different clicks. I am using
txtusername.text=cstr(int(rnd()*1000))
It gives random numbers but in a same sequence like whenever I run and click on generate button it shows
973
again click
950
again click
939
But when I close my program and again running program then same sequence starting from 973
973
again click
950
again click
939
So I want codes for generating random string or integer without repeating sequence after programme closing again and again.
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Jun 3, 2011
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code].....
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Jan 20, 2011
so i have a quite huge program. but lets say i have one label. and i want to save that. i have the code and everything for saving the text of the label. now i want to assign ctrl+s to automatically save the labels text once pressed instead of going through a menu to choose save.this is like a regular texteditor where u press ctrl+s and it saves.
ive used this
If (e.KeyCode = e.Control & Keys.S) Then
MessageBox.Show("Ctrl+S pressed")
End If
and
[code]....
but it doesn't do anything once pressed.im also using the keydown declaration for the form.
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May 18, 2010
I followed an example from a VB 2008 Wrox book on creating, binding and updating a data set but I am having a problem. The code is supposed to automatically generate the update/insert/delete statements for me (according to the book) but when I call the update command, the data is not saved.
Here is my code
Code:
Imports System.Data
Imports System.Data.SqlClient
Public Class FrmAddExpenses
[Code]....
After the form is loaded, I change the EntryDate field (which is a DateTimePicker) and close the form which should save the change but it doesn't work.
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Jan 19, 2010
Recently I implemented an interface which had some 130 members that i should implement (C#, but i think thats irrelevant).How can i generate the stubs for all those automatically, in VS 2008...If its not possible in VS 2008, i've also installed Coderush Express, can some one guide me on how to do that with CR Express ?
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Nov 13, 2009
I'm using Visual Studio 2008 and MS Access 2007.
I have linked the database to vs2008.
The first problem I have now is how to add all the data to the combobox from access 2007? [I have solved this myself accidentally.]
The second problem I have is I cannot save the primary key.
Assume that I have these:
Table name: tCustomer
Fields:
ID Datatype [Text]
[Code]....
Now, the user fills in the form. The ID cannot be edited by them where it's automatically counts the number of customer in database and give the id. For example, I already have 3 customers in the database so when I add new Customer, it will be 4 for the ID.
When I click save, it shows me the message of "Index or primary key cannot contain a Null value." I have set an input mask for my Customer. So, can I make it to save in a format like CT001, CT002, CT003 automatically?
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Aug 23, 2011
On a client i have an anonymous list containing a multi-column primary key previously selected from the DB.Then i need to select all the records from the DB that equals the primary key list i have stored in the memory.[code]
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Mar 2, 2012
How i can import row from TABLE1 to TABLE2 without primary keyfield or adding correct value to primary key
i tried with two different codes, but result is same, it says: "In the column "Key"a constraint on the uniqueness.[code]...
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May 26, 2006
I want to be able to get some data from my database table, given the value of the primary key. This is what I have so far:
projectName = DbDataSet.Projects.FindByid(projectId).name
where projectName is a String, and DbDataSet is my dataset. The variable projectId is the ID of the row I want to extract the data from, but every time I run my code I get a NullReferenceException.
I know that the row with the primary key value of projectId exists because I can see it when I view through server explorer.
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Sep 2, 2011
I'm using the following code to generate a CSV file containing data from a dataset. The CSV generates fine and a prompt box displays so that the user can either open or save the csv file. What I'm wondering is whether it's possible to save the CSV file?
Edited with solution (NB I don't need the prompt box to open as I'll be writing additional code to generate and save a number of files and then display links to them). This saves the dataset as a CSV on our server.
Protected Sub exportBtn_click(ByVal sender As Object, ByVal e As System.EventArgs)
Dim ds1 As DataSet
ds1 = csvdownload.ReturnNewPledges()
[Code]....
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Jan 8, 2009
I have an .net windows device application. I have a small form where i want to scan one item in a text box and then scan the other in the next text box and when that is done once it is done i want to save to dababase automatically. And get the focus to the first text box automatically.
[Code]...
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Dec 5, 2009
I want my app to take a picture, then save it automatically. Can I do that with the save file dialog or how would I do that?
[Code]...
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Nov 9, 2011
how to delete rows of data without using the primary key VB.netI am using Access 2003 & VB 2005
Private Sub BtnDel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnDel.Click
Dim dt As New DataTable
[code]......
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May 26, 2009
I am new at asp.net, so I would be glad, if anybody could help me in this case... I scanned already the internet for answers, unfortunately with no success..I have a grid view, and this is loaded by a sql data table, this table has 2 keys (RezeptNr and Zutatnr). When I wanna update a row in the data grid, the RowUpdating event fires, so I need to read the Basket Session, what has the complete object stored. I put this in a DataTable (dt1), so far so good..The problem is line: Dim dr As System.Data.DataRow = dt1.Rows.Find(id) Here the compiler alerts, that I have two keys, and he cannot select the data sentence with the find method. I tried it with datatable.select command, that works, but then I have the data sentence in an array, but I need to update the data row of the data table.
[Code]...
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Apr 15, 2009
Is there a way to have a record automatically save like in Access? I would like to save the record before going to the next record or before exiting.
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Jan 9, 2009
I had the following codes,by the default,after i choose a file from the openfiledialog,then savefiledialog will display to let me chosoe where should i save the file.
But,now I would like to do so which is after I choose a file from the openfiledialog,the selected file should be automatically copy to my desktop without showing savefiledialog to let me choose the destination.What should I change from the following code?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fullFilename As String
[Code].....
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Apr 3, 2009
I have created a form that enables me to enter data for adding a new customer. so far i am able to save the data as a line and separte each field with a "#", with out any problem but the thing is i am not sure how to assin a primary key to the data, every time i add a new customer to my txt file i want the primary key to be one number higher than the previous.
so that i can l8r enter the primary key to search for the costumer and view that data
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Feb 3, 2012
How do I fetch the loginID and display the student data on the textbox?E.g. I login with loginID of 18 but it only display the data of 12
Private Sub frmLibrary_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'LibraryDataSet.Student' table. You can move, or remove it, as needed.
Me.StudentTableAdapter.Fill(Me.LibraryDataSet.Student)
End Sub
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May 21, 2011
I have managed to successfully create a logon page and have created a form to insert data into one of my tables using text boxes and a "Save" button, however the first field in the table is the named "CustomerID" and is set to Autonumber, this is the primary key of the table. If I enter a record into the table in Access it automatically enters the next valid ID however when I can't seem to make this happen when entering data via my VB form!
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Apr 25, 2012
i have a project where I need to concatenate strings from 4 different tables based on a sequence of numbers. I created a 5th table that holds the number sequence and dictates in what order the strings get appended. I have created primary keys on the tables, but 3 of the tables are composite primary keys. I have written up to where I start referencing the primary keys, but am not sure how I should reference the keys on the actual tables. I saw some examples for creating composite keys from an array which I did. The main questions are did I declare the composite keys correctly, am I creating the composite key reference from the array correctly, and how should I reference it all to append to the stringbuilder variable.
[Code]...
And yes I kn ow it would be easier if I used Strongly Typed Dataset, but this is a clr sql stored procedure and have not found any examples on how to add a .XSD to a stored procedure. The add item option is not available, besides a bunch of typing
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Mar 21, 2010
we have a vb.net application with send and receive mailing also. Now we have added a session timer of 30 min but the users are complaining that they are facing a problem when they write a long text message or while composing they get busy in something else and when they return back to continue composing message , they are redirected to a session expiry page, and their long text message is gone forever. So I am new to this and I was thinking like , when the user is in compose message the text should be automatically saved to drafts like hotmail.
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May 26, 2011
I defined a database using SQL Server 2008 R2 Express, and connected to it using Visual Basic 2010 Express. For some reason though, when I use the database in the program, it wants to start off using a negative primary key.Is there any way to make the primary key only a positive number?
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Jun 3, 2011
I'm using MS ACCESS for my dbase..i have a tblborrow where you can find transac_num ..now, i have in my form a label which here, you can see how many transactions you have done already(i'll name it sa lbltransacno) and a save button..what i want now is that.. every time the user save a transaction.. the lbltransacno will automatically go to its next number.. but of course.. the user should fill up the information needed.. if those are not filled up, and he click the save button.. the transaction will not be counted.. how to code it?
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