Nullable Object Must Have A Value Inserting Into An SQL Table Using VB In Visual Studio 2008?
Dec 6, 2009
I have an insert query set up for my VB table adapter. It includes all the columns in my table. Some of these columns are Nullable VARCHAR and DATE and I want to set them to null on the insert.
In my code I have two varaibles defined as Dim Sdate as nullable (of date) Dim Sdata as nullable (of Char)
And I set them as follows:
Sdate = nothing
Sdata = nothing
On the insert query the "Catch" is activated and displays "Nullable Object must have a value"
I Sdate and Sdata have values, then the insert works just fine.
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Oct 15, 2010
I am new to SQLSever, Visual Studio and Visual Basic. I have read through Microsoft Visual Basic 2008 by Michael Halvorson and Microsoft Visual Studio 2008 by Lars Powers and Mike Snell. These books mention the ability to use SQLServer as the DB but I am not clear on the process. I am not knew to programming an have had training in OO programming but have never done any OO programing professionally. So, you can assume I am new to OO programing.
I have created an SQL DB using the Server Explorer in VS, and created a Windows form with Labels, TextBoxes, and ComboBoxes for the application's user to add the demographic information about a new employee. I created a new query with the Query builder that is in the Employee table of the DB which contains all the field for the record for inserting. I have a few questions to understand the process for inserting into the DB.
The DB fields are defined as numeric(6, 0), nurmeric(5, 2), and char(30) for some examples.
The maxlength on the form windows are in sync with the maxlength of the DB for the various fields.
1. What is the process to update the DB with the fields from the form?
2. Do I need to declare and set the results from the form first? If so, how do I call the function (query) that I created in the Employee table.
3. The emp_num I would like to be a dynamically incrementing number starting from 1000. How do I make this a dynamic? The emp_num is also the key on the Employee table.
4. I have a decimal field on the Employee table to hold emp_rate (pay rate). Does the user enter the decimal on the Form or is this resolved by SQL to take the 7 numbers and insert the decimal beause of the table's field definition?
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how to create table in visual studio 2008
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Display Control - combo box,
Row Source Type - Table/Query,
Row Source - SELECT [State].[state_id], [State].[state_abbr] FROM State ORDER BY
[code].....
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I wonder if anyone can help me - I've not done much with reflection but understand the basic principles.What I'm trying to do:I'm in the process of developing a class that gathers a lot of information about the local system, network, etc... to be used for automated bug reporting. Instead of having to change my test harness every time I add a new property, I'd (ideally) like to be able to serialise the lot as an XML string and just display that in a textbox.
Unfortunately, the Framework won't use the default XML serializer on read-only properties (which almost all of mine are) as they wouldn't deserialize properly [Not sure I agree with the assumption that anything serialized must be de-serializable - MS says this is a feature "by design" which I suppose I can understand - Perhaps a tag to indicate that it should be serialized anyway would be advantageous?]
The initial approach was to make properties gettable and settable (with a throw exception on the setter) but the amount of work tidying this up afterwards seems a little excessive and I would want the properties to be read-only in the final version.What I need help with:My current plan is to use reflection to recursively iterate through each (public) property of my topmost gathering class. The problem is, the samples I've seen don't handle things recursively. Additionally, I only want to inspect an object's properties if it's in one of my assemblies - Otherwise just call .ToString on it.
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May 20, 2009
I am getting an unusual error "Nullable object must have a value" when running the code below.
[Code].....
Interestingly the Stored proc used by the table adapter still runs and does the insert but the function returns the error.
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When I double click on a form control while in the design view in a Web Application project within Visual Studio 2010, say a 'button' or a 'submit' for example, it inserts a javascript function into my .aspx file. When I do this at work it automatically creates an event handler for the control in the code-behind.How do I change this to that setting? I have used '/resetsettings' already, and other answers to similar questions do not solve my problem. I have reinstalled, gone through every menu I can find (though I may have missed something)I don't want to type those event handler subroutines every time!
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I tryed to do something like this: ReportViewer1.LocalReport = myLocalReport but without luck since LocalReport property on ReportViewer is read only..(I know to preform this using the ReportViewer1.LocalReport method. All I want is to create a single code and bind it either to the printer directly or to the preview form)
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[Code]...
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[Code]...
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I am trying to "make table" query. Below is my texT
[Code]...
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Public Function TestFunc() As String
Dim lMapper = cRouter.StaticPortMappingCollection
Dim lMappedPort As NATUPNPLib.IStaticPortMapping
Dim Test As String
[Code]...
How to get this value? By my way I get *System.__ComObject*
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[Code]...
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[code]...
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Can anyone provide me a method or sample code to do this?
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[Code]...
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Dim check As String
Dim check_cmd As New MySqlCommand
Dim checklist As New MySqlDataAdapter
[code]....
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