Error When Insertion Of Data Into Database
Aug 3, 2010
Actually in our project we create different database using vb form code..so this database is a chance of transferring to other users to use others database. so when we create the database it will insert the database name into the main database. Problem: One user who is accessing MS 2010 ACCESS has created a database and transferred into other PC where MS 2003 access available..when he is going to insert database name into main database which is transferred it is not inserting into main database exception is occured..
[Code]...
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Aug 24, 2011
I have recently been working on a number of sections of code that deal with the insertion of Nullable types into a database. As I'm sure anyone who has dealt with similar code will be aware of the annoyance of constantly writing conditional logic to deal with the insertion of nulls into a database. I.e.:
MyValue.HasValue ? MyValue.Value : DBNull.Value;
If(MyValue.HasValue, MyValue.Value, DBNull.Value)
Basically I am just wondering why DBNull.Value exists and why Null simply couldn't be used?
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Jun 4, 2011
i have a table with data definition: [code] My problem is that i can't see the inserted data in my table. [code]
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Mar 10, 2009
I'm getting this error when I go to insert data into access DB using vb.net 2008 which is specified by the user.
"OleDbException was Unhandled No value given for one or more required parameters "
If I hard code the values it works just fine.
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
[Code].....
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Jun 22, 2010
In visual studio 2008.i want clear information to work..
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Mar 2, 2010
We have some predefined strings that can be inserted into a text box during data entry via a button click. How can we track the cursor insertion point so the inserted code is in the right place if the user clicked somewhere in the middle of the data before clicking the button?
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Oct 9, 2011
I'm using the following code to insert the data in a table and i am getting the error at cmd.executenonquery()....The exception is labelled as SQL exception and the underlying message says "String or binary data would be truncated. The statement has been terminated." [code]
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Feb 24, 2011
Try
Dim SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLiteCommand
SQLconnect.ConnectionString = "Data Source=" & Application.StartupPath & "Databasedb" & ";"
SQLconnect.Open() ' VS highlights this line
[code]....
Is it because of the database extension ? I used sqlite Admin to create tables
Edit : I just tried it out in VS 2008, it works flawlessly. Why is it not working in VS 2010. Does it something have to do with app.config file ? or .net framework 4 ?This is what I added in the app.config file
<?xml version="1.0"?>
<configuration>
<startup useLegacyV2RuntimeActivationPolicy="true">
[code]....
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Apr 4, 2010
I am trying to insert data into my database but because i have relationships in the database, i can't enter data into one unless the other has been entered but i can't also do all that at the same time.This is the error i get: You cannot change values of this column because it is related to another table, what do i do and what is the next best option if i don't want to use "autonumber" but want to make sure i don't repeat numbers. How do i implement that?
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Jan 22, 2010
I am having a problem when changing data (or altering data in a feild)I have the error message for a better explaination of the problem
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Sep 2, 2010
I'm working on a form that allows to add new users to a users table in my Access database. The table only has 3 fields: user (string), password (string) and admin (boolean). user is the primary key. But when I run it and try to add, I get an error when casting the query to Double (?). I don't have any double variables or table fields, and I'm not trying to cast anything from or to double. So I have no clue about how to fix this. The code I'm using to insert (and it's working correctly on other forms and tables I have) is:
[Code]...
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Oct 23, 2010
How can I catch error if the data that user select not in database?
This is my code.[code...]
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Jul 16, 2009
i have encountered this error Variable 'dsNewRow' is used before it has been assigned a value. A null reference exception could result at runtime when i click on the button to insert data into my ms access database.
[Code]...
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Mar 4, 2012
I am trying not to become intimidated or give up.I created a simple database and added stored procedures to read the data on a Windows form using Visual Basic in VS 2010.First I tried the Data Grid Example and all worked, I was able to view the data using a connection string to call the Stored procedure.I have stepped it up a notch by trying to bind data to form controls and I am getting this error message when I try to navigate through the data.
System.NullReferenceException was unhandled
[code].....
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Sep 15, 2010
I have been trying my hand at this for some days now and just cant get anything to work. Below is the code im currently using to delete a row from a database table, the problem when trying to build the project line 5 is giving this error about the value con" Value of type String cannot be converted to 'System.Data.OleDb.OleDbConnection' "
Dim con As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=Customers.mdb"
Dim cnn As New OleDb.OleDbConnection(con)
cnn.Open()
[CODE]...
I have also tried using this code below, but to no success. Im basically just looking for something rock soild that i can use to accomplish this task. Been stuck on this for quite a while now.
CustDetailsTableAdapter1.Connection.Open()
Me.CustDetailsTableAdapter1.Delete(txtDelCustN.Text, txtDelCustSname.Text, txtDelCustTel.Text, txtDelCustAddr.Text)
CustDetailsTableAdapter1.Connection.Close()
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Mar 12, 2010
how can i put the insertion key at the first textbox?
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Jul 25, 2011
Been looking at this for a few hours now, is it possible to insert into the FIRST line in a rich text box? I have a simple app that regularly copies a reference file to several PCs but I need to have the success/failure and timestamp visible, so I want to insert into the top line each time - ie. in descending order.
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Jan 16, 2012
Im confused on how to write a code on checking duplicates before insertion on vb.net. I know the sequence on how to do it but its kinda confusing when writing a code.
1.) Create a query that will check if the mobile number already exists on the database
2.) If not, insert the new data
3.) Else, a message will prompt that "You are already registered".
writing this in PHP is kinda easy for me but in vb.net.. , unfortunately, not easy.. Im still a beginner on vb.net.
[Code]...
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Apr 11, 2011
When we have code like this:
vb.net
Using connection As New SqlConnection(strConnString)
Using command As New SqlCommand(strQuery, connection)
command.Parameters.AddWithValue("@CuserID", intUserID)
command.Parameters.AddWithValue("@CstartTime", dtStartTime)
[Code]...
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May 12, 2011
I've been trying to learn enough to develop the family tree diagram and making progress.[URL]..It illustrates many of the drawing, saving, re-opening, editing, drag/drop features that the family tree diagram would need, and is a good starting point.
To adapt this for the project, after searching for snippets online, I've tried to add dynamic insertion of a label as a start (eventually, it should be a textbox that the user, in runtime, can enter text into, save, re-open, edit). But, I can't get this to work. No errors display, but I must be doing something wrong.
Here's the label code which I've so far appended at the end:
[Code]...
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May 28, 2009
I know you can do it with an WMI event or overriding WndProc and looking for the right messages, but i was wondering if there wasn't something hidden in the net framework that makes this task easyer.
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Oct 29, 2010
I am using VB .Net to connect to an access databse when using several connection sometimes i get this erro "unspecified error microsoft jet database engine" even though i am an administrator on my local machine.
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Sep 17, 2010
I got a system which i want to insert, delete, update the data into my database and the data from database will be display using datagrid. The below is the coding for one of my button, delete.
Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
Try
btnSearchEmpNo.Enabled = False[code].....
Now I wanna set when user click on this button to delete a employee (for example) then the datagrid that i have in my application will not show the data of the deleted employee but in the background, the employee haven't been deleted from database.The employee only will be deleted from database when the user click on SAVE button.I know this application have to use RowState but how?
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Dec 14, 2011
What I want to happen is that the button from my system will remove the previous data from database and then insert new data to database from text file. Im done with inserting new data. The thing is that I dont how to control or where to put the Delete Command from my code.
[Code]...
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Jun 10, 2010
My ConnectionString is working fine.
I've saved my SQL command in a string as follows: Dim sqlcmd As String = "select LEFT(eventDate,10) from Locations"
Dim sqlreader As SqlDataReader
Then I open my connection and at that point everything is fine.
I can execute the query just fine but the error comes up when I try to fill data into my webapp.
sqlreader.Read()
loc1Date.Text = sqlreader("eventDate").ToString() ---------- This is the line that is giving me the error "System.IndexOutOfRangeException: eventDate"
I just want the date pulled and not the time. get this date to fill into my textbox on my webapp.
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Dec 26, 2011
suppose we have three tables in the Database:
[Code]....
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Jan 8, 2012
Why is it that this VB.NET code only works for detecting flash disks?
Select Case m.WParam
Case WM_DEVICECHANGE_WPPARAMS.DBT_DEVICEARRIVAL
MsgBox("USB Inserted")[code].....
What would be the possible way to detect the insertion and removal of other USB peripherals, such as mouse and keyboard?
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Nov 22, 2006
I am having problem with my FYP that my application is based on the detection of Insertion and Removal of a device. I am aware that this would happen using Win32_VolumeChangeEvent class or WMI. (Please notify me if I am wrong). Kindly solve this problem and send the code for Console Application in VB.NET. Please do not send code in any script language or C#. Also to get the device information.
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Jul 28, 2011
scardgetstatuschange DOES wait(timeout is set INFINITE by -1) for card-insertion after connecting the reader-device to the pc. After a card is being insterted the first time and removed again, it won't wait any longer and returns immediately everytime;
lResult = SCardGetStatusChange(DethContext, -1, rgReaderState(0), 1)
So, scardgetstatuschange CAN work. But why only when i re-attach the cardreader-device to the pc????
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Sep 25, 2009
is there an issue, in [VB2010] for the trouble of the insertion of a transparent swf in an windows form ??
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