DBNull Value - Cannot Save Records
Dec 14, 2009
I have a form with some textboxes in it. Not all the boxes are mandatory fields. I also have a store procedure that saves the records to the DB. when I try to save a record, I get an error PLS-00306. I am passing the required number of parameters to the sp. When I populate all the fields, the record is saved but NOT when some fields are left blank.
If txtInvoiceRef.Text = Nothing Then
strSQL.Parameters.Add(New OracleParameter("varInvoiceID", OracleDbType.Varchar2, 50, ParameterDirection.Input)).Value = System.DBNull.Value
ElseIf txtPaymentDate.Text = Nothing Then
strSQL.Parameters.Add(New OracleParameter("varPaymentDate", OracleDbType.Date,
[Code] .....
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Feb 24, 2010
I have a populated datagrid that has some fields that are needed for calculation in my app. In the dataset they are set to Allow DBNull False because I can't have a DBNull in my calculation for obvious reasons. I have found answers to incorrect data entry and blank fields in these critical fields (see code block below), but they only work if some data is entered somewhere in the new record, even if I populate the field with default values other than <DBNull> on adding a new row. If a user doesn't add any information and just tabs through a new record/row or cursors down the app blows up. If they cursor up without entering any data, the blank field procedure for these protected fields engages fine.
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Apr 2, 2009
'Already declared the DataSet as dtFile and SqlDataAdapter as daFile
Dim SqlQuery as String
SqlQuery = "Select * from FileRegister where FILE_NO='" & frmBsearch.txtFileNo.Text.Trim & "'"
daFile = New SqlClient.SqlDataAdapter(SqlQuery , SQLConnection)
daFile.Fill(dtFile , "FileRegister")
frmBsearch.txtSPrefix.DataBindings.Add("text", dtFile, "FileRegister.Prefix")
frmBsearch.txtSPlotNo.DataBindings.Add("text", dtFile, "FileRegister.Plot_No")
frmBsearch.txtSBlockNo.DataBindings.Add("text", dtFile, "FileRegister.Block_No")
How can I add a new row and save those records in the TextBoxes?
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Jul 18, 2012
I am implementing an application in vb.net about a library management system, when I add new record to the database and then close and reopen the application, the record is not there!
I googled the issue and used the text book of this course but nothing beneficial.
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Mar 7, 2012
I am new in VB .NET 2010, I am trying to code ADD, EDIT, UPDATE, DELETE simple function, I use SQL Server 2008, I have done saving function but Im stack with duplicate records, How to code if records exist then prompt a message, if not then it will save.
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Jul 18, 2010
i have a register form and a dataset called clifs_project21Dataset.xsd
i just want to update
de info from register form to dataset and i use acces 2007
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Dec 21, 2010
How can I make the record save (like on access - it can be saved and from the main screen you can choose the job (Im basing this off the access free file "customer service")
Im essentially re creating that but on vb.net as I prefer to use vb.net as it is slightly easier for me.
My question is how can I make it save the record both as a file and on the main page so that the employee can go through the jobs (or search for the job), choose which job, open it and see the form saved with all the information still on it - yet still editable.
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May 17, 2012
In a single table i want to save three records in at a time. with a single query. how i can do? can u give a simple example?
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Jun 18, 2012
how to save records in listview into ms access database table using a button, i've tried with my codes but nothing is saved in the database `Inline Code Example Here`
private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim con As New OleDbConnection
[Code].....
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Jun 5, 2012
i'm having problem saving my records into database here's my code
[Code]...
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Jun 29, 2010
I managed to displayed records from two tables in one datagridview and the first column being a combobox. Now, I would like to get those records displayed and save it to another table. this what I did.
For i As Integer = 0 To dtgLoad.Rows.Count - 1
Using command As New SqlCommand("INSERT INTO tblteachersload (Teacher ,SubjectName) " & _
"VALUES (@Teacher, @Subject)", cnn)
With command.Parameters
.AddWithValue("@Teacher", Me.dtgLoad("Column1", 0).Value)
[Code] ......
I would like to loop through the records of the datagridview and then save the same to a table.
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Mar 15, 2010
I want to create a sub that gets changes from my typed dataset and datatable. But it says mydatatable is not a public member of dataset. Passing in as objects.
Public Sub GetRateChanges(ByVal myDataSet, ByVal myDataTable)
If myDataSet.HasChanges(DataRowState.Modified Or DataRowState.Added) Then
' Create DataSet variable.
Dim xDataSet As DataSet
[CODE]...
Another question. . I pull this infor from a view via tableadapter and it comes from several different tables.. How could I save my changes and insert the new records to the appropriate tables>?
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Mar 13, 2011
I need to be able to save, edit, and delete records in an access database through vb2008. Editing and deleting records works perfect, but I cannot save new records. Can anyone assist?
Here is my code
Imports System.Data.OleDb
Public Class Main_Form
Dim con As OleDbConnection
Dim cmd As OleDbCommand
[code].....
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Jun 23, 2011
My code below will save records to my database as long as all the parameter have values. One of the parameter is @MI (middle initial), however, there are times that student have no middle initial so when I click my button I get error. I want to still save the record even if one of the parameter value is missing.
[code]...
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Apr 5, 2011
I don't know why it is not saved to the table. Here is my code.
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles btnSave.Click
Try
[Code]....
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Jan 18, 2012
In my ASP.Net Web-Application, I'm getting this error: Conversion from type 'DBNull' to type 'Boolean' is not valid.
[Code]...
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Dec 15, 2011
I created table named "tb_sale" using ms access 2007, it has 5 columns (date, product, qty, price, total)
I created a listview which has same columns with tb_sale (date, product, qty, price, total) Then, I dragged a datagrid (tb_saledatagridview) from tb_sale to the form, hoping i can insert multiple records from listview to tb_saledatagridview.
I manage to insert record from listview to unbound datagrid, but not for bound datagrid. code that I can use to insert and save data from the listview to tb_saledatagridview.
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May 17, 2006
I can retrieve records from my Database fine, but I'm having trouble updating records. I am getting a syntax error on [code] I get this error when I change the Last Name (Row 0, Column 1). [code]
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Oct 27, 2009
how to get records into oracle database delete from db & update the records i have successfully connected my vb 2008 win form with oracle 10g.
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Dec 29, 2011
How do I update records in a dataset with records in a transaction file?
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Feb 9, 2010
I want to search the records from the textbox and display the records to the datagridview, if there are no records, just display empty on the datagridview.
this is not working:
Dim sqlsearch As String
sqlsearch = "SELECT * FROM setting WHERE mname LIKE '%" & TextBox.Text
[code].....
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Mar 27, 2012
I have this piece of code wich works perfectly when inserting records into one table using records from another table. My question is that now i need to create another table by using records from 3 other tables (tables are related). Can i use aliases on the column names, like on Oracle SqlPlus? How will be the syntax of the 'INSERT INTO SQL statement?
Dim MyConn As ADODB.Connection
Dim MyRecSet As ADODB.Recordset
Dim tmpSQL As String
MyConn = New ADODB.Connection
[code]....
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Apr 17, 2010
I am working on creating a program that records animal data (wombats) and stores it into a database, using vb.net. I am trying to add new records into a database but every time I click add, to execute that, there are duplicate records that gets added. How do i write the code so itonly adds it one time. I am using a data reader. Here is the
[Code]...
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Dec 13, 2011
I am teaching myself vb.net with visual studio 2010 and i have ran into a wall. I have a datagrid on my form that shows all of my customers that are in the dataset that was created in access 07. I have a search bar and check boxes to select which column name to search in. Whenever I search it throws up a strong typing exception,
System.Data.StrongTypingException was unhandled by user code
Message=The value for column 'PickupTime' in table 'CustomerRouteTable' is DBNull.
Source=EXBSTESTDatabase
[Code]....
I think this means that there is nothing in the field, but this is a field that nothing should be in. If i comment the throw exception out it moves on to the next one that has nothing in the field. I tried just putting 0's in all of them but it still gives the same exception.
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Mar 11, 2010
I want to search the records from the textbox and display the records to the datagridview, if there are no records, just display empty on the datagridview.[code]
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Nov 9, 2011
I am receiving this error on this line
ctl.Value = CType(Me.Value, DateTime)
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Jan 19, 2012
I have been having an error that DBNull cannot be returned as a String and after hunting around I came up with the folowing but have had no sucess. it is very inportant that this code can handle DBNull as it will encounter this often.
[Code]...
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Mar 10, 2010
Dim k as nullable(of double)I am INSERTING a rec in database containing K (sometimes it has some value otherwise a null) It works ok.But when i UPDATE a rec and assign a field the value of k and when k is NULL
it gives me an error that you cannot assign a NULL , you should use DBNULL.But i think DBNULL.value can only be assigned to an object not to double.
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Nov 12, 2009
I need to make something like :
if isdbnull(value) or value = something then
'do something
else
[code].....
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Sep 29, 2009
So I'm importing Excel data using ADO into a DataTable then pushing out to an Access DB. A couple of the Excel columns have several blank cells that I would like to change to a zero before pushing it out. How can I check/change the DT null values to zero? I've done some searching but was wondering if I could do it without a loop.
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