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Insert null into sql db via aspx page

I am trying to substitue null values into the db for Date fields becuase I don't like how sql injects 19000101 automatically if nothing is there to insert.  how can I accomplish this and for that matter aother fields as well.


Dim Dtdate As TextBox = TryCast(row.FindControl("txtMCal"), TextBox)

  If Dtdate.Text = "" Then
                Dtdate.Text.
            End If

            sql = "Insert tblSRpEventData (intPersonnelId, intUnitSRPId, intQuestionId, bitAnswer, strData, strRemarks, dtDoc, dtLogged, strlogged) VALUES (" & PersId & ", " & UnitID & ", " & QuesId & ", " _
                    & "" & answer.SelectedValue & ", '" & data.Text & "', '" & Remarks.Text & "', '" & Dtdate.Text & "', '" & Date.Today & "', '" & userlogon & "')"

            insertUpdateDelete(sql)

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kdeutsch
Asked:
kdeutsch
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1 Solution
 
CodeCruiserCommented:
Does the field allow nulls? Sql wont add the default date if null is allowed. The default date is set when null is read back into your program.
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kdeutschAuthor Commented:
CodeCruiser:
Yes I allow nulls for that field in the Db, but on insert its still setting the default date in there.
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CodeCruiserCommented:
Are you using the calendar control on page. It returns default dates.
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kdeutschAuthor Commented:
Hi,
Yes I am using the calendar control inside a gridview as such.
<asp:TemplateField HeaderText="Record Date">
                                                            <ItemTemplate>
                                                                <asp:TextBox ID="txtCal" runat="server" Width="100" style="cursor:pointer"></asp:TextBox>
                                                                <asp:CalendarExtender ID="txtCal_CalendarExtender" runat="server" TargetControlID="txtCal" />                                                            
                                                            </ItemTemplate>
                                                          </asp:TemplateField>
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CodeCruiserCommented:
You would have to add a check so that if no date is selected, null is added to the field.
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kdeutschAuthor Commented:
What i am doing is rotating through my gridview when i save, because its an options field in the gridview, they don't have to put a date in there.  I tried the following inside of the ratating but a textbox does not have a value.  This would be the step to check it and from what I have seen on google where everyone checks it but my syntax fdoes not give me the value it blue underlines it.

 For Each row As GridViewRow In myGridMedical.Rows
            Dim QuesId As Integer = myGridMedical.DataKeys(row.RowIndex).Value
            Dim data As TextBox = TryCast(row.FindControl("txtMData"), TextBox)
            Dim Remarks As TextBox = TryCast(row.FindControl("txtMRemarks"), TextBox)
            Dim Dtdate As TextBox = TryCast(row.FindControl("txtMCal"), TextBox)
            Dim answer As RadioButtonList = TryCast(row.FindControl("rblMedical"), RadioButtonList)

            If Dtdate.Text = "" Then
                Dtdate.value = IsDBNull()
            End If

            sql = "Insert tblSRpEventData (intPersonnelId, intUnitSRPId, intQuestionId, bitAnswer, strData, strRemarks, dtDoc, dtLogged, strlogged) VALUES (" & PersId & ", " & UnitID & ", " & QuesId & ", " _
                    & "" & answer.SelectedValue & ", '" & data.Text & "', '" & Remarks.Text & "', '" & Dtdate.Text & "', '" & Date.Today & "', '" & userlogon & "')"

            insertUpdateDelete(sql)
        Next
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CodeCruiserCommented:
If you step through the code, what happens on the following condition?

  If Dtdate.Text = "" Then
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kdeutschAuthor Commented:
Hi,

Sorry just getting back to this, nothing happens on that point, it still goes through and puts in defaut date.  Would it be easier if I changed the datatime to a varchar, then I could insert nothing.
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CodeCruiserCommented:
I use varchar to store dates.
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kdeutschAuthor Commented:
CodeCruiser,

I think i am going to back to that method because its to hard to try to insert null dates into a sql db, i was told not to do this, becuase then they have to convert everything.
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CodeCruiserCommented:
> then they have to convert everything.
But currently they have to test for nulls.
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kdeutschAuthor Commented:
Changed to a string value in server, this allows what I need it to do with easier coding.
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