SQL Server :: Update The Db With A Null Value?
Mar 11, 2011
I have a pretty basic sql update statement that is looking for lots of parameters. It's possible that since a field isn't required, that a user will not make a radio button selection. If that is the case, I just want the field in my sql table to remain as a null value. But, what I have now, updates the sql value to a "0". How do I tell sql that if there isn't a value for this parameter, to update the field as Null? Here are my parameters and part of my sql update statement. What am I doing wrong?
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Sep 27, 2010
I have a vb.net page that has an optional parameter. If a user enters data for that field, and clicks save, it saves fine via the stored procedure. HOWEVER, if the user changes their mind, and wants to erase the data they entered, they go to the text field, and delete the characters, and click save, but no matter what, the stored procedure will not save the fact that they erased the data (it won't set it back to NULL). If the user enters a space, the stored procedure will save the space, and if they enter different data, it will save the other data. I can't figure out how to get it back to letting them set it to Null? I think this is because it's an optional parameter, and the stored proc is used by several forms (Some of those forms do not include this parameter), but this form utilizes that optional paramater.
Here's my stored procedure...
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Aug 10, 2010
I have a table converted from Access and the identity keys were lost. Now I need to make the id column the identity column, but it already has a lot of null values, how do I auto generate integer values for the null rows? The row ids are incremented, so if there is a way to auto increment the ids
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Oct 2, 2010
I have 2 table Table A, Table B.
Table A - Parent Table
ID - Uniqueidentifier not null(PK)
Table B -Child Table
ID - uniqueidentifier null(FK, TableA)
I have a stored procedure to insert data into Table B, but when I tried to insert a null value into column ID of table B, this error came up:
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_tableB_tableA". The conflict occurred in database "database name", table "table A", column 'ID'.
The statement has been terminated.
The insert statement in asp.net is like so:
sqlcommand.parameter.add(New Sqlparameter("ID", Nothing))
I am guessing adding nothing to the null value column is the problem, but i don't know how to fix it... The INSERT statement conflicted with the FOREIGN KEY constraint "FK_tableB_tableA". The conflict occurred in database "database name", table "table A", column 'ID'.
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Nov 6, 2010
i am using the following in a stored procedure.
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[Code]....Handling NULL...Field not updating when NULL?
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Apr 12, 2010
I have a typical gridview/formview master control setup. When I try to update or insert I don't get any errors but it also doesn't work. When I try to insert data all I get are null values and when I update, none of the values are updated. The formview looks like its working, but just doesn't. The primary key is an identity and it auto-increments by one.
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Jul 27, 2010
I had grid view which retrieved data from database and mad update for specific columns but when I did update on columns it give other columns null value what can I do? note :the columns which had null value I made them readonly because user hadnot permission to edit them
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Sep 13, 2010
Can anyone reliably get the EDS to save a nullable column to the databse as a "null" when bound to any of the controls such as "FormView"?I have tried using several different UpdateParameters (Session, ControlParamater, Parameter, etc). I have tried setting "ConvertEmptyStringToNull" to true and leaving the property off entirely. Nothing works. On my "Inserts" it works fine.(I have made sure the column is set to nullable = true in the Entity Designer.....)
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Mar 27, 2011
I'm populating an object model with a linq query. The model looks like this:
MyModel{
DateTime AppointDate {get; set;}
int TotalAppoints {get; set;}
int AppointDuration {get; set;}
}
The linq-to-sql query looks like that:
public static GetAppointsFromDB(params){
var MyQuery = from....where...
select new MyModel{
AppointDate = ...,
TotalAppoints = ...,
AppointDuration =...};
return MyQuery as MyModel;}
In the master page, I'm looking to load the result of this query in the session like this:
if (Session["Appoints"] == null) {Session["Appoints"] = GetAppointsFromDB(...);}
When I run with the code, the session is always null. I added this line a second time, just right after, and the query runs again. When I'm looking to use the session at some other point in the code, it is null too there too. The query works because when I put a breakpoint on the return statement, I see the object properly filled.
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Jan 9, 2010
here is my update query syntax.my problem is.if i update only logo1 and logo3 with null logo2 and img null then my query should be update the other record.just dont update null value record but other should be update.but below my query can not update any record.
UPDATE tbitem set itemname= @itemname,note=@note,
price=@price,qty=@qty,logo1=@logo1,
logo2=@logo2,logo3=@logo3,img=@img
where id =@id
and @logo1 is
null and @logo2
is null
and @logo3
is null
and @img is
null
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Sep 8, 2010
I have a ASP.NET page that contains a formview and ObjectDataSource. On the page I only have 4 fields that are bound to fields in my datasource. My datasource contains 10 fields. When I call an update it is setting the 6 fields I am not binding to to null. The only way I can find it get around this is to add hidden fields for the 6 unbound fields and bind them to the datasource.Is there anyway around this without using hidden fields?
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Sep 23, 2010
I have a FormView which is bound to an SQLDataSource. When a user clicks on a save button the form, I need to write any changes made to the FormView back to the table.
I have a Stored Procedure on my MSSQL 2005 database that should be executed when the user clicks on the save button.
It appears the Update is firing, but when I trap the DbCommand object in the SQLDataSource's 'Updating' event, all of the parameters that should be passed to the Stored Procedure are coming through as NULLs. Consequently, the Stored Procedure isn't updating anything.
In the click event of the save button I'm explicitly firing the SQLDataSource's Update method:
[Code]....
The parameters in the SQLDataSource <UpdateParameters></UpdateParameters> section appear to be correct.
Can anyone give me an idea on what to investigate to figure out why it appears the Update is only picking up NULLs?
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Feb 24, 2011
I am using an EntityDataSource with a FormView on VB.NET application. The FormView contains an AjaxControlToolKit TabContains with multiple tabs. Due to the fact that each tab is a naming container, Bind doesn't work properly for updating values (as discovered from reading other posts on stackoverflow). I instead have to declare UpdateParameters on my EntityDataSource. Example markup is as follows:
<asp:FormView ID="fv" runat="server" DataSourceID="eds" DataKeyNames="ID">
<EditItemTemplate>
<asp:TabContainer ID="tc" runat="server">
<asp:TabPanel ID="tp" runat="server" HeaderText="Tab 1">
[Code]....
This works great, until a customer is edited and their name is set to nothing (assuming in this case, a null name is allowed). The Name UpdateParameter is set to Null but the ObjectStateEntry is not set to modified for Null properties, even if previously the Entity had a value specified. As long as the name is changed to something other than Null, everything is updated correctly.
I found a workaround by putting the following code in the Updating event of the EntityDataSource.
Dim ose As ObjectStateEntry = context.ObjectStateManager.GetObjectStateEntry(action)
For Each p As Parameter In eds.UpdateParameters
ose.SetModifiedProperty(p.Name)
Next
This makes sure that each property in the UpdateParameters has its state set to modified. It works, but it seems like a hack and I can see it causing problems down the road. Is there anything else I could do?
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Apr 13, 2010
I have a Gridview showing the data on one of my tables, and when I try to edit the data in one of the columns after I click update, rather than updating the record with the new value I typed in, the rows become null as in, everything in the row I just edited disappears. This inmediatly makes my application crash because one of the fields in my table (IssueDescription) doesn't allows null values.
This is the code, which is actually 100% auto-generated from when I created the GridView control and specified in the options to implement update, delete, edit options.
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AutoGenerateColumns="False" DataKeyNames="ticketNum"
DataSourceID="SqlDataSource1" [code].....
What is making the rows turn into null after the update? I did some research and tried to define the Update behaviour myself using RowUpdating function. After hours of learning how to use it I got it to "work", but because the Update turns everything to null when it updates, the sqlconnection command I use to do the query sends null anyways. I can paste the C# code if you'd like to see it, though I'd rather not use it if the auto-generated by asp above can be fixed instead.
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Nov 2, 2010
So I have followed this tutorial to try and me edit a record in a datalist.
[URL]
When I click update after updating anyfield it throws a NullReferenceException was unhandled by the user code. Here is my code.
protected void DataList1_UpdateCommand(object source,
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Apr 14, 2010
Using vb.net/asp.net 2005.
I have to bind the value
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and I have the sqldatasource as follows:
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Dec 15, 2010
I am trying to update a table with a textbox value:
The details view:
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Jan 17, 2010
I am going to outline my setup then where i am failing
UpdatePanel1 - Contents : 3 textboxes and AddButton
UpdatePanel2 - Contents : 1 GridView and SubmitButton
AddButton adds new row to DataTable with data from textboxes, binds DataTable to GridView SubmitButton sends data to database. The Adding of a row works to add the row to the gridview, but it won't add a second or third and so on, only adds the 1. SubmitButton belives the DataTable that GridView is databound to is null and won't send anything to the database. How can i get the datatable to persist between the two update panels? Do i use Sessions as my storage location? Page
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Aug 9, 2010
Here is my stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
Create PROCEDURE [dbo].[sp_GetNextSeq] (
@p_NextSeqNo int = NULL OUTPUT
)
AS
BEGIN
SET NOCOUNT ON;
BEGIN TRY
BEGIN TRANSACTION
Generate Next Sequence Number
[code]...
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Jan 14, 2010
I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
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My gridview code is -
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Sep 30, 2010
we have a AutoGenerateColumns-enabled WmxDataGrid in which we are able to update table rows in a DataBase connected with a SqlDataSource.
Each time we clear a field an empty string is written to the database where we want to write DBNull values.
At the moment we generate the update string via UPDATE... SET.. and the SQL Server function NULLIF(value, '').
Works proper but when I want to add the values to e.NewValues in BeginUpdate event I'm not able to read the values from the auto generated text boxes. How do I do that? Is there an easier way to automatically convert empty strings to NULL values?
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Jul 9, 2010
I have a FormView that is loaded with a records from my DB. Some of the fields may be blank or null. I am trying to check the value of some of the text boxes to verify that the user has updated the fields prior to allowing a DB update from the Edit Template.
I can not seem to get the correct syntax on the if statment to check the value of the text box....
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Oct 14, 2010
I have a function that checks for a username and if it finds the username it will allow the user to update the user, there are 3 main columns: Name,Age,isFemale. I have the enduser supply the information and then I try to update the record but I get a sql error for "not a valid" column.console app:
[Code]....
I pass the spIsFemale by using an enum, here is the Person Class with function.
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I get an error that column isFemale is not valid. The isFemale column is a bit type. If it's a 1, it's a female, if 0 male. this is more of a test area and I'm trying to update records or create new one's if the name does not exist.II am new to C # and I am just trying to learn new ideas and methods within C sharp.
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Dec 2, 2010
I have the query to retrieve selected record in textbox. How to use this query to update record: I want when I enter sumit in textbox1 and click submit button then the record with ID 1 will be updated to name sumit
Dim SQLData As New System.Data.SqlClient.SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True")
Dim cmdSelect As New System.Data.SqlClient.SqlCommand("SELECT TOP 1 Name FROM Table1 Order by Id DESC", SQLData)
SQLData.Open()
Dim dtrReader As System.Data.SqlClient.SqlDataReader = cmdSelect.ExecuteReader()
If dtrReader.HasRows Then
While dtrReader.Read()
TextBox1.Text = dtrReader("Name")
End While
Else
Response.Write("No customer found for the supplied ID.")
End If
dtrReader.Close()
SQLData.Close()
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Nov 6, 2010
I have my Access database bound to a Gridview and an able to Edit and Update the Grid as long as all columns are set to ReadOnly=False. If I make one or more columns ReadOnly=True I get the following error on updating: You tried to assign the Null value to a variable that is not a Variant data type How do I get past that problem?
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