I have a column in my database which contains null value. Now after retrieving value from database i want to store that value in my txtbox. I am getting
[DBTableFieldIsNullException: Field 'Title' is NULL] exception.
I am using Visual studio 2010 express and I have a details view databinded to an sql database table. When I use the Insert option on the view it causes an error due to it trying to insert a null into the primary key field. If the Insert function does not create a new primary key entry how is it created?
View 9 Replieshow can insert null value into integer field
View 3 Repliesbelow is House_info table in database
Id Behtop Service1 Service2
1 1111 Estate Null
2 2222 Home Home1
and I have 2 Textbox in page that users can enter text on them and update House_info tables column service1 and service2
below is SP:
@Service1 nvarchar(20)=NULL,
@Service2 nvarchar(20)=NULL
as
begin
update House_info set
Service1=@Service1,Service2=@Service2
END
and behind code
_cmd.Parameters.AddWithValue("@Service1", TxtMT1.Text);
_cmd.Parameters.AddWithValue("@Service2", TxtMT2.Text);
problem is that if users enter text in TB and click on button it update columns data but if they don't enter any thing in textbox it enter space in Table like:
Id Behtop Service1 Service2
1 1111 Estate
2 2222 Home Home1
I want if users don't enter any thing in text box it insert in table "NULL".How I can do it?
I have a form and stored procedure that inserts the data from the form. It works fine except that if a field isn't filled in it doesn't insert a NULL into sql it inserts "".
I've tried a few different ways but none seem to insert NULL, the one below still inserts "", can anyone point me in the right direction.
Here is the required part of the code, if you require more just let me know.
[code]....
So if I enter nothing into address1 field it should write NULL to screen but it always writes NOT NULL.
I have one text box for accepting date. I want to store date column in database is null when the text box value is null and how to bind the this null value to text box when i retrieve.
View 1 RepliesMy database includes a table with sever filds which are defined as (varchar(1),null), I tried using DBNull.Value, null, ' ' but cannot get a null inserted in that field of the database,
[Code]....
How should i insert null values into a database. I have textbox1 and the textbox2 will convert the value out of textbox1, when i the time i click save and the textbox1 is empty i got an error, "Conversion from string "" to type 'Date' is not valid." i just want to insert null value if the textbox is empty.
View 1 RepliesI have a calendar control that sits inside a gridview and when i insert into the sql db it inserts the defaults of 111900, how can i insert Null instead of the default date.
Protected Sub lnkSubmitDental_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lnkSubmitDental.Click
Dim userlogon As String = Split(Current.User.Identity.Name, "")(1)
[code]...
here is my latest bit of insanity. I'm using a formview control. In the insert template, I'm grabbing applicable values from my AD to populate a dropdown list. I select the user I want to insert, enter the other pieces of info required for my request and click Insert. The query responds back stating that the userid is NULL. So the big question in my mind is how can I bind userid to the dropdownlist if I'm populating that from the code behind? Here's my code behind code for that list:
[Code]....
I am new to .NET and MVC, so this is most likely a simple question: How can I have a default value appear for an Html.TextBox or TextArea field, for example if the code is currently - <%=Html.TextBox("ApplyToFax", Model.Competition.ApplyToFax, New With {.class = "regular", .maxlength = "50"})%>. I am looking to have a default fax number appear in the box when the page loads, for example (999) 999-9999.
View 5 RepliesBasically, the user Selects a row on GV that executes an Insert into a table the GV cell values of the selected row.
The SQL field data type is varchar. If the GV field is Null, the Insert adds the value to the SQL field. How do I keep the @nbsp; from being displayed in the cell of a data control when it is called at a later time? Do I add some more asp to my control parameter? do I add some vb code behind? Here are some relevant code snippets of existing code.
[Code]....
[Code]....
How can I use required field validators in the insert item template in a listview control? The empty fields in the insert item template are preventing the user from deleting or updating ay other row.
View 6 RepliesI have a DetailsView on the page and I have made one of the fields a TemplateField. In the EditItemTemplate and InsertItemTemplate I have a DropdownList that is databound to a table in my Sql Server database. I wanted to add an initial value to the DropdownList
namely "- select -" .
I set the AppendDataBoundItems property to true and added the initial value as a ListItem.Markup of the DropdownList
<asp:DropDownList ID="DropDownList_HP" runat="server"
AppendDataBoundItems="True" DataSourceID="SqlDataSource_HP" [code]...
This works fine for new input. The problem is however that the database already has records that were entered through a Windows Application and many of these records has a null value in this field and exceptions are thrown when I tried to open these records
and the system tried to set the SelectedValue of the DropdownList.After some more searching I found this help
http://msdn.microsoft.com/en-us/library/ms366709.aspx
So I changed the ListItem in the DropDownList markup to the following:
<asp:DropDownList ID="DropDownList_RefHospDV4" runat="server"
AppendDataBoundItems="True" DataSourceID="SqlDataSource_RefHosp" [code]...
This now solved the problem of opening a record where the value is null in the database, BUT now the RequiredFieldValidator is not validating anymore to make sure that a databound item is selected for this field and not the initial value "- select -". So basically now it is not checking anymore to see if valid input has been entered for the DropDownList and it accepts "- select -" thus it acts as if the field is not a required field anymore.
In short what is required is that I want to make sure that the user enters a valid selection in the DropDownList, but it must also cater for old records that do not have this field entered yet so that those old records can be opened in the DetailsView .Opening Old records (with null in that field):When these old records are opened in the DetailsView the DropDownlist should show "- select -" when the value in the database is null.
Saving records (old or new records):When saving the record in Insert mode or Update mode the RequiredFieldValidator should show that a valid input is not selected if the DropDownList is still on "- select -".
i am using the following in a stored procedure.
[code]....
[Code]....Handling NULL...Field not updating when NULL?
In reference to this question that I just asked, [URL] it appears that for some reason, an empty text box's value is not being fed to SQL Server as NULL, as it ought to be.
View 6 RepliesI want to disable the requiredfield validator control for the textbox based on some condition of a variable
if(var==null)
{
//Activate it
}
else
{
//disable it
}
How to prevent displaying this " " on the textbox control if the GridView columns is Null?
View 2 RepliesI have a form with many form fields and controls, with some offering an "other" if a value does not meet the needs for the user. How can I bind the sql insert so that it will take the ddl selection along with the txt field selection for the "other" value? Even if the txt field is empty it should not be a big deal since the ddl would provide something other than null. Since the column in the db does not allow nulls. I'm using asp.net (vb) 3.5 sp1
View 3 RepliesIn Microsoft Access Database Form, I have a series of five fields. I would like to set up a field that is equal to the first field unless that field is null or 0. Then I want the field to be equal to the second field unless that field is null or 0, continuing the same way through the five fields. Being a newb, I have no idea how.
View 1 RepliesIn the below code when I remove the optional end date and click save it should just take the value as blank, but it doesn't
when I remove the date and click save it saves but still shows the same date as before...when I make it to null it should remain null...how do i do that
#region Save Package
protected void btnBack_Click(object sender, EventArgs e)
{
this.Response.Redirect("/?id=Promotion.PackageList");
}
[Code]....
here is my code for selectiong some records from db table
string strSql = "select * from mtblNBD where SentTo=@SentTo and InternalStatus Is NULL order by DeadLine desc";
SqlCommand com = new SqlCommand(strSql, con);
com.Parameters.Add("@SentTo", SqlDbType.NVarChar, 50).Value = (string)Session["uname"];
here I am using parameters for SenTo field but not for NULL so it is ok... or should I use parameters for this field where value is NULL , if yes then how can I use parameter for this
how can insert null value in image column.i using sql server 2005 and in my database i have column image and datafield id image.when i browse a image and insert it then it is working but when i insert it without image then it is not saved.an error ocure-Operand type clash: nvarchar is incompatible with image.
I INSERT LIKE
[Code]....
if (!String.IsNullOrEmpty(hospitallist))
{
//If TextBox is not empty pass value.
cmd.Parameters.Add(new SqlParameter("@Hospital_list ", SqlDbType.VarChar, 2000));
}
else
[Code] .....
Dim newMem As New Subscription With { _
.First = txtName.Text, _
.Email = txtEmail.Text, _
.dateLastEmail = "1/1/1980", _
.subDate = Now}
dbp.Subscriptions.InsertOnSubmit(newMem)
dbp.SubmitChanges()
The table contains a field called conDate that is nullable, and in this case I want it to remain null. It will get a date value later, when a confirmation is received. If I add .conDate = "1/1/1980", _ I can successfully add the record, but without that line I get System.InvalidOperationException: Nullable object must have a value. I tried this:
Dim DateConfirm As System.Nullable(Of DateTime) = Nothing and adding
.conDate = DateConfirm, _ but that didn't help either. How can I add a record without giving a date to a field I want to remain null?