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Insert null into sql db via aspx page

Posted on 2011-02-11
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Last Modified: 2012-05-11
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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Question by:kdeutsch
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Expert Comment

by:CodeCruiser
ID: 34871793
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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Author Comment

by:kdeutsch
ID: 34872126
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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LVL 83

Expert Comment

by:CodeCruiser
ID: 34872423
Are you using the calendar control on page. It returns default dates.
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Author Comment

by:kdeutsch
ID: 34872536
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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LVL 83

Expert Comment

by:CodeCruiser
ID: 34872575
You would have to add a check so that if no date is selected, null is added to the field.
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Author Comment

by:kdeutsch
ID: 34873479
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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LVL 83

Expert Comment

by:CodeCruiser
ID: 34883574
If you step through the code, what happens on the following condition?

  If Dtdate.Text = "" Then
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Author Comment

by:kdeutsch
ID: 34916909
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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LVL 83

Accepted Solution

by:
CodeCruiser earned 350 total points
ID: 34917002
I use varchar to store dates.
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Author Comment

by:kdeutsch
ID: 34917512
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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LVL 83

Expert Comment

by:CodeCruiser
ID: 34917572
> then they have to convert everything.
But currently they have to test for nulls.
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Author Closing Comment

by:kdeutsch
ID: 34917894
Changed to a string value in server, this allows what I need it to do with easier coding.
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