How To Pass Null Value To The Database If A Form Field Is Empty?

May 31, 2004

How can I pass into the database (@User_fax = null) if the fax form field is empty, from a command type Stored Procedure? For example:





Dim CmdUpdate As New SqlCommand("Form2_NewUser", strConnection)


CmdUpdate.CommandType = CommandType.StoredProcedure





CmdUpdate.Parameters.Add("@User_fax", SqlDbType.char, 9)


CmdUpdate.Parameters("@User_fax").Value = fax.Text()





...





strConnection.open()


CmdUpdate.ExecuteNonQuery


strConnection.close()











And, the stored procedure inside Sql server:





USE market1


GO


ALTER PROC Form2_NewUser


@User_id bigint, @User_fax char(9),...





AS





SET NOCOUNT ON


UPDATE Users


SET User_fax = @User_fax, ...





WHERE User_id = @User_id


SET NOCOUNT OFF


GO











Thank you,


Cesar

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Jan 12, 2008

Hi:
Trying to insert null value into sql table, but not working, if I use:
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Where is the problem?
Thanks a lot.
Jt

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Null, Empty Strings, And Efficiency

Oct 12, 2004

************* Edited by moderator Adec ***************
Inserted missing < code></ code> tags. Always include such
tags when including code in your postings. Don't force the
moderators to do this for you. Many readers disregard
postings without the code tags.
**************************************************

Well met,

Let's say I have a web form that allows users to insert and update records in a SQL database. Is it better to set empty web controls (textbox, etc.) to DBNull or let it go as an empty string into the database?

Example code:

if (tboxNAME.Text == "")
{
sqlCommand1.Parameters["@NAME"].Value = DBNull.Value;
}
else
{
sqlCommand1.Parameters["@NAME"].Value = tboxNAME.Text;
}

Is the above overkill? It seems like it would be a good idea to set fields which the user empties back to Null rather than an empty string.

Thanks,

-Tony

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Nov 10, 2005

Hi folks,

I've have about 100 tables, for some reasons, column values that are originally NULL was inserted as emtpy string. So, I am wondering if I can write JUST ONE SQL (hopefully don't have to specify the field names in the SQL as well) for each table so that all the empty strings will be converted back to NULL.

THANKS JOHN

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I found some solutions of displaying 0 for NULL but I want to dispaly NULL (or empty) for 0.

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