Linq-To-Sql Is Not Using The Database-defined Default Values

Jun 6, 2008

All --

Please help.

Linq-To-Sql is not using the database-defined default values.

For example, suppose there exists a column, Table1.Column1, of type nvarchar(32) in the database.

Further suppose that Table1.Column1 has a default set as '', an empty string, set in the database itself.

Now suppose that one has a Linq-To-Sql class mapped to this table.

Note that if one then tries to insert, using the Linq class, and one does not provide a value for Table1.Column1, then it throws a RTE.

Is there a way around this other than writing a partial class and using the Extensibility methods?

Please advise.

Thank you.

-- Mark Kamoski

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User-defined Stored Procedures InsertCustomerin Northwind Database That Is Cached In Database Explorer:No New Values Inserted?

Jan 14, 2008

Hi all,

I put "Northwind" Database in the Database Explorer of my VB 2005 Express and I have created the following stored procedure in the Database Exploror:

--User-defined stored procedure 'InsertCustomer'--

ALTER PROCEDURE dbo.InsertCustomer

(

@CustomerID nchar(5),

@CompanyName nvarchar(40),

@ContactName nvarchar(30),

@ContactTitle nvarchar(30),

@Address nvarchar(60),

@City nvarchar(15),

@Region nvarchar(15),

@PostalCode nvarchar(10),

@Country nvarchar(15),

@Phone nvarchar(24),

@Fax nvarchar(24)

)

AS

INSERT INTO Customers

(

CustomerID,

CompanyName,

ContactName,

ContactTitle,

Address,

City,

Region,

PostalCode,

Country,

Phone,

Fax

)

VALUES

(

@CustomerID,

@CompanyName,

@ContactName,

@ContactTitle,

@Address,

@City,

@Region,

@PostalCode,

@Country,

@Phone,

@Fax

)
=================================================
In my VB 2005 Express, I created a project "KimmelCallNWspWithAdoNet" that had the following code:
--Form_Kimmel.vb--
Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.SqlTypes

Public Class Form_Kimmel


Public Sub InsertCustomer()

Dim connectionString As String = "Integrated Security-SSPI;Persist Security Info=False;" + _

"Initial Catalog=northwind;Data Source=NAB-WK-EN12345"

Dim connection As SqlConnection = New SqlConnection(connectionString)

connection.Open()

Try

Dim command As SqlCommand = New SqlCommand("InsertCustomer", connection)

command.CommandType = CommandType.StoredProcedure

command.Parameters.Add("@CustomerID", "PAULK")

command.Parameters.Add("@CompanyName", "Pauly's Bar")

command.Parameters.Add("@ContactName", "Paul Kimmel")

command.Parameters.Add("@ContactTitle", "The Fat Man")

command.Parameters.Add("@Address", "31025 La Jolla")

command.Parameters.Add("@City", "Inglewoog")

command.Parameters.Add("@Region", "CA")

command.Parameters.Add("@Counrty", "USA")

command.Parameters.Add("@PostalCode", "90425")

command.Parameters.Add("@Phone", "(415) 555-1234")

command.Parameters.Add("@Fax", "(415 555-1235")

Console.WriteLine("Row inserted: " + _

command.ExecuteNonQuery().ToString)

Catch ex As Exception

Console.WriteLine(ex.Message)

Throw

Finally

connection.Close()

End Try



End Sub

End Class
==============================================


I executed the Form_Kimmel.vb and I got no errors. But I did not get the new values insterted in the table "Custermers" of Northwind database. Please help and tell me what I did wrong and how to correct this problem.

Thanks in advance,
Scott Chang

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2
3 using System.Linq;
4
5 using System.Text;
6
7 using nwind;
8
9
10
11 namespace Ex
12
13 {
14
15 class Program
16
17 {
18
19 static void Main(string[] args)
20
21 {
22
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26
27 from c in db.Customers
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31 select c;
32
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34
35 Console.WriteLine("{0}", kh.CompanyName);
36
37 Console.ReadLine();
38
39 }
40
41 }
42
43 }
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