VS 2010 Class From Database Record
Jun 13, 2010
Is there a direct way of generating a class from a record in the database?I use a program to edit records and would like to use a class that has the record fields as member for saving the last values entered while adding new records and the initial values of the fields for editing so that if i press ESC the control while editing the value returns to the original.I tried to use dim r as datarow but i get the error that there is no object
and if i declare dim r as new datarow i get the error that new is not implemented.Do I have to write the class definition explicitly?
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Sep 26, 2011
I have a collection of objects (classes I created), and each one ties to a record in a database. I want an easy way to update the information, so I thought about declaring a record in the class, that would tie to the record on the database. However, I'm having a problem updating it now.
1) Can I declare a global variable for the data context, and leave it open the entire time the program is running? This would solve my problem, but I don't know if I can do that.
2) If not, besides coming up with a complicated class to do this, is there an easier way? Here is an example of what I am trying to do:
VB.NET
Public C as Record
Public Sub GetValue()
Dim SQL As New DBDataContext
Dim X = From T in SQL.Records Select T
[Code] .....
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Aug 9, 2010
I am trying to check a record in database before inerting a new record here is my code but problem is when i enter a names first alphabet it imediatly populate massage. i want to check it after entering whole name
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Try
Dim cnString As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" &
[CODE]...
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Nov 9, 2010
first of all here is the code that populates the fields when the user logs in. This code is correct and works fine.
Dim passwordrow() As Data.DataRow
passwordrow = MyDBDataSet.Tables("Customer").Select("Username = '" & txtusername.Text & "'")
'This try statement checks to see if a row has successfully been found
[Code].....
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Mar 27, 2011
The form it is on is frmMidwest.vb, the database is MarchMadnessDB, with the table being tblMidwest and the column being Username. I am trying to get it so when the user loads frmMidwest.vb it will then check the database to see if the user has entered their picks and if they have it will load their picks back into frmMidwest.vb if the database cannot find their user then it needs to add a record to the database and allow the user to enter their picks. I have already established this with
TblMidwestBindingSource.AddNew()
But if the user exists I do not want them to be able to enter another record. The primary key in the database is the username.
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Jul 16, 2010
I'm new at vb.net programming so be gentle. I have the flowing code
Dim dAdapter = New OleDbDataAdapter("Select * from items", dbConOra)
Dim dTable = New DataTable()
dAdapter.Fill(dTable)
BSourceItems.DataSource = dTable
DataGridVew1.DataSource = BSourceItems
[Code]...
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Jul 8, 2011
How will I transfer deleted record into another table instead of deleting it permanently? I think it is what we call "history"..somehow..For example I have 2 tables. 1 is Original_Record the other is Deleted_Record. If I deleted one record in Original_Record, the deleted record will be transfered into Deleted_Record table.
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Aug 10, 2011
The system should not insert selected records from my datagridviewcheckboxcolumn if it's already existed in the database.It's like when you're registering online. If you're username/email address already registered,it would inform you that youre username/email is already registered and the site would ask you to change your username/email to new ones.The difference in my system is that i have 2 datagridviewcheckbox columns not just textboxes . Parent and Child in the datagridview. What i want to happen is that once the Code has been registered as Parent it cant be registered again as Child anymore.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
connectionString = ";"
sql_connection = New SqlConnection(connectionString)
[code]....
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Feb 26, 2011
I recently download/Installed Crystal Report for Visual Studio 2010 to work with Visual Studio 2010 Prof. Database from SQL Sever 2008 Express. Now my problem is when I run Crystal Report Viewer - Windows form : 1st message Database Login request and otherwise WRONG RECORDS DISPLAYING which I have not in my database table.
do print reports for my new Windows Application.
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Nov 15, 2009
I have a problem with my program, and it's really bad because I need to burn it to disk within 12 hours and I can't get it to work: If I create a record, add information to it and click on Next Record, the ID, Status and Notes boxes content will change but the rest of the controls contents are carried over to the next record and I don't know why or how. It was working perfectly but now it stopped and I never done anything.
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May 23, 2010
I have records in a database. Each record has a Picture path in it eg. "C:\Pics\Image1.jpg". I would like to display a record from my database and also the picture for that record, in a .rdlc report in vb .net 2008. i have succeded in displaying the record but just can't get the picture to show. I am using an Imagebox in the report.
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Apr 15, 2012
I have a access database with these columns. USER_ID,COUNT,TIMES
Let say the current record is this:
USER_ID,COUNT,TIMES
STEVE20,24,1.5
Now I want to updated the current count record and times, but before updating I want the old record to be added to the new record. What should be my query?
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Sep 21, 2011
how to view the next record and previous record in the database.? just like in the picture below.? what condition should we use.?
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Apr 16, 2011
I'm maintaining a Datagridview on my Windows Form. When I open the form all the contained records are displaying, which is from SQLserver Table ok. when I open the form the datagridview should show just black and after I insert a new record that particular record should only display on that form gridview. [Code]
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Jun 2, 2010
Somewhat new to SQL and processing loops. I have a non-keyed file and I want to get the next record in sequence .. grab data needed and update it as used. This class is called from a GUI interface so I only need to grab the NEXT record each time..
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Apr 18, 2009
I hav a web service which pull records from a database and I am hosting these services in IIS which works fine but I am trying to retrieve the record and display the record in a listbox displaying the time field as the text for that record.I have created the following function
public sub get_data()
dim dt as new data.dataTable
dim service as ws webservice.webservice
[code]...
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Apr 27, 2011
I want to read a number of items from a file and then associate each of those items with a new button at run-time, so that when the user clicks one of the buttons I can display some information about that item.Can I use a LIST to manage these buttons and items? Can I create a new class and have each list item of that class, such as 'btnID', 'btnText', etc... ?
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Oct 9, 2011
I have the following defined in my "Form1":So that I can access all my database functions anywhere in the main form (database connection is initialized via the "private sub new()" function in the DatabaseManager class.The works fine for all queries done in form1, however I have many other classes I'd like to be able to access the database from.Does anyone know how to access the initiated class in my example? Since right now it is initiated in the main form, if I try to access any functions inside any ot
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May 9, 2012
can someone please help me with a textbox? I have created a new class and require this textbox field within a sub in the new class but i get Error1 'TextBox1' is not declared. It may be inaccessible due to its protection level.I have tried MyClass.TextBox1 = Form1.TextBox1 but I get declaration expected.
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Jun 21, 2010
I am trying to add a new record to a database using VB.net. I have used code for one table in the database which worked and then copied and pasted it and changed the column names to the ones in the other table and then I got an error saying that the insert into statement was wrong even though I am using a comand builder. [code]
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Jan 31, 2012
I currently have a Microsoft Access database which is being accessed through an ASP .NET front end. I am trying to add a row to a table, but this doesn't appear to be working, the code I am using is shown below.[code]....
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May 22, 2012
I've been trying to add a record to an MDB Database, but for some reason all my code runs fine, but when I check my database no records have been added, I'm doing it on on gotfocus event to make data entry easier with a bar code scanner?
Public Class Form1
Dim con As New OleDb.OleDbConnection
Dim dbProvider As String
Dim dbSource As String
[code].....
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Mar 3, 2010
There are 12 columns in the table, and I need to update only 3-4 of them, the rest are autokeys I guess, or I need to update them at a later stage in my program...
"Stock, Date, GP, Scratch & UV" TextBox's
These contain the data which need to be added to the columns #4 - #8[code]...
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Dec 22, 2011
I have problem that my code doesn't add record into the database i don't know why
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Aug 29, 2010
I'm trying to get the last records in the database
my code doesn't give an error but also doesn't do what it supposed to[code]...
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Dec 27, 2011
I want to get some value from some table in access database
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May 10, 2011
Get the last record from a Microsoft SQL database table using ASP.net (VB) onto a web form.
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Nov 22, 2011
I'm trying to get the ATM Class to Instantiate on the Form class.
[code]...
ISSUE = " 'ThisATM' is used before it has been assigned a value. A Null reference exception could result at runtime"
The Other problem i am having is with a class in the program called CardReader. What am i supposed to type to let the code below be able to "read" the read function on the Form1?
[code]...
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Nov 27, 2011
Haven't coded in a while, and ran into a wall when setting up my program data structure
So I have something like this in a class file;
Public Class X
Public Stuff as Integer
Public Stuff1 as String
[Code].....
I want to structure my program this way, what's the best way to go about that?
I want to access multiple data types in the same array from within a class, as it should be a subset of my base class etc... and want to be able to change the size of the array
Or is this class array within class nesting a dead end?
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Jun 11, 2012
I want to create a class that will "search" for something. Basically I load up the "search item" when the class is created and inside the class is logic to do the "search". The result of this logic will be more "searches" that I want to start. How can I have the logic in the class create another instance of the class itself?
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