Link to home
Start Free TrialLog in
Avatar of FMabey
FMabeyFlag for United Kingdom of Great Britain and Northern Ireland

asked on

Update SQL Server table with blanks

I have the following code which updates a SQL Server table from a windows application:

   Private Sub SaveGAD()

        If BOO_open = False Then

            SqlConnection1.Open()
            SQL_GAD_Update.Parameters("@Cont").Value = PUB_Cont
            SQL_GAD_Update.Parameters("@Str").Value = PUB_Str
            SQL_GAD_Update.Parameters("@Gdr").Value = "" & TXT_gdr1.Text & ""

            SQL_GAD_Update.Parameters("@GDP").Value = "" & TXT_cam.Text & ""
            SQL_GAD_Update.Parameters("@GCT").Value = "" & CB_cam2.Text & ""
            SQL_GAD_Update.Parameters("@GSAP").Value = "" & TXT_subarc.Text & ""
            SQL_GAD_Update.Parameters("@GML").Value = "" & TXT_mag.Text & ""
            SQL_GAD_Update.Parameters("@GMF").Value = "" & TXT_magW.Text & ""
            SQL_GAD_Update.Parameters("@GD1").Value = "" & TXT_dpth2.Text & ""
            SQL_GAD_Update.Parameters("@GD2").Value = "" & TXT_dpth4.Text & ""
            SQL_GAD_Update.Parameters("@GDE1").Value = "" & CB_dpth1.Text & ""
            SQL_GAD_Update.Parameters("@GDE2").Value = "" & CB_dpth3.Text & ""
            SQL_GAD_Update.Parameters("@GN1").Value = "" & TXT_note6.Text & ""
            SQL_GAD_Update.Parameters("@GN2").Value = "" & TXT_note7.Text & ""
            SQL_GAD_Update.Parameters("@GN3").Value = "" & TXT_note8.Text & ""
            SQL_GAD_Update.Parameters("@GFN").Value = "" & TXT_fno.Text & ""
            SQL_GAD_Update.Parameters("@GRN").Value = "" & TXT_revno.Text & ""

            If TXT_revdate.Text = "" Then

                SQL_GAD_Update.Parameters("@GRD").Value = System.DBNull.Value

            Else

                SQL_GAD_Update.Parameters("@GRD").Value = "" & TXT_revdate.Text & ""

            End If

            SQL_GAD_Update.Parameters("@GW").Value = False
            SQL_GAD_Update.Parameters("@GFCT").Value = "" & TXT_cam3.Text & ""
            SQL_GAD_Update.Parameters("@GFCB").Value = "" & TXT_cam4.Text & ""
            SQL_GAD_Update.ExecuteNonQuery()
            SqlConnection1.Close()

        End If

    End Sub

Currently, if a textbox is empty, the SQL Server table gets updated with a blank cell. My question is, should I be checking if the text box is empty with an if statement for each parameter (similar to the if statement for the @GRD parameter shown above), and then insert a system.dbnull.value?

Cheers
Avatar of dportas
dportas
By "blank" do you mean a zero-length string? A zero-length string is not the same thing as a null.

This is really a database modeling question. Does your database allow nulls and if so what is the designer's intended meaning for nulls in the database? The topic of whether and when to use nulls at all is a big one and probably not something we can do justice to in this forum.
Avatar of FMabey
FMabey
Flag of United Kingdom of Great Britain and Northern Ireland image

ASKER

Yes, I mean a zero-length string and yes, the database does allow nulls. The designer does not want to do anything with the nulls... If it's empty, it's empty. I was just curious as to how best handle this.
ASKER CERTIFIED SOLUTION
Avatar of dportas
dportas
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
Avatar of FMabey
FMabey
Flag of United Kingdom of Great Britain and Northern Ireland image

ASKER

Good, clear explainations
Avatar of FMabey
FMabey
Flag of United Kingdom of Great Britain and Northern Ireland image

ASKER

Cheers dportas,

I understand much better now. I'll take it on from here.