How To Insert Null Value Into Database?

Mar 13, 2007

hi guys. i'm using vb.net with vs 2003 and MSSQL Managment Studio Express as my database server.
i want to insert null value into database, so i use System.DBNull.Value
but it doesn't show NULL, but a empty field. I tried System.DBNull.Value.ToString, it gives me same result.
what can i do to have NULL in that field?
thanks for any advise, i would appreciate it very much.

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I have a function that updates a table in sql server
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Server Error in '/' Application.


Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.Source Error:



Line 89: sContact.Phone = sPhone.Text.Trim
Line 90: sContact.Email = sEmail.Text.Trim
Line 91: sContact.Save()
Line 92:
Line 93: Dim bContact As Contact = New Contact()Source File: F:InetpubwwwrootOutman KnifeCheckout.aspx.vb    Line: 91 Stack Trace:



[SqlException (0x80131904): Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +857354
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734966
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
System.Data.SqlClient.SqlDataReader.HasMoreRows() +150
System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout) +214
System.Data.SqlClient.SqlDataReader.Read() +9
System.Data.SqlClient.SqlCommand.CompleteExecuteScalar(SqlDataReader ds, Boolean returnSqlValue) +39
System.Data.SqlClient.SqlCommand.ExecuteScalar() +148
SubSonic.SqlDataProvider.ExecuteScalar(QueryCommand qry) +209
SubSonic.DataService.ExecuteScalar(QueryCommand cmd) +37
SubSonic.ActiveRecord`1.Save(String userName) +120
SubSonic.ActiveRecord`1.Save() +31
Checkout.btnCheckout_Click(Object sender, EventArgs e) in F:InetpubwwwrootOutman KnifeCheckout.aspx.vb:91
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
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Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

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/*------------------------
use riqdb2
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------------------------*/
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Code Snippet

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------------------------------------------------------------
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------------------------------------------------------------
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If a datetime variable is empty I want to insert null into the database table.

How do i do this? Below code doesn't work. Get this error...
Cannot implicitly convert type 'System.DBNull' to 'System.DateTime'




Code Block
if (myDataGridView.Rows[iRow].Cells["myDateDataGridViewTextBoxColumn"].Value.ToString() != "")
{
myDateReport = DateTime.Parse(myDataGridView.Rows[iRow].Cells["myDateDataGridViewTextBoxColumn"].Value.ToString());
}
else
{
myDateReport = DBNull.Value;
}

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Jul 2, 2007

I need to insert a null valvue when the user does not impute any text.
here is my code
If cell_phone.Text = "" Then
cell_phone.Text = "dbnull.value"
End IfDim mySqlConnection As New SqlConnection
mySqlConnection.ConnectionString = ConfigurationManager.ConnectionStrings("Call_ListConnectionString").ConnectionString
Dim strSQL As String = "INSERT INTO Employees(Clock_ID, Last_Name, First_Name, Cell_Phone, Home_Phone, Work_Phone, Email, Primary_Day_Phone, Primary_Night_Phone, Blackberry_Number) VALUES ('" & clock_id.Text & "','" & last_name.Text & "','" & first_name.Text & "','" & work_phone.Text & "','" & home_phone.Text & "','" & cell_phone.Text & "','" & email.Text & "','" & prime_day_lst.SelectedValue & "','" & prime_night_lst.SelectedValue & "','" & blackberry.Text & "')"Dim mySqlCommand As New SqlCommand(strSQL, mySqlConnection)
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mySqlCommand.ExecuteNonQuery()
mySqlConnection.Close()
THanks
Mike
 

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How To Insert Null Into Date Field?

Dec 11, 2007

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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?
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Jt

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