Question

我是Linq的新手，我正试图在Northwind数据库上搞砸它。我已经在线查看了如何进行插入，但以下鳕鱼似乎不起作用。为什么这些数据不会进入供应商表？

using (LinqDataClassesDataContext northwind = new LinqDataClassesDataContext())
        {

            Supplier newSupplier = new Supplier 
            { 
                SupplierID = northwind.Suppliers.Max(id => id.SupplierID) + 1,
                CompanyName = "Doe Electrical",
                ContactName = "John Doe",
                ContactTitle = "Mr.",
                Address = "123 Fake Street",
                City = "Dublin",
                Region = null,
                PostalCode = "123456",
                Country = "Ireland",
                Phone = "123456789",
                Fax = "987654321",
                HomePage = "Hello World!"
            };

            northwind.Suppliers.InsertOnSubmit(newSupplier);

            try
            {
                northwind.SubmitChanges();
                Console.WriteLine("Inserted");
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
                Console.ReadLine();
                throw;
            }

        }

程序运行完成，没有例外，但数据未插入。感谢

我已更新供应商ID

CREATE TABLE [dbo].[Suppliers] (
[SupplierID]   INT           IDENTITY (1, 1) NOT NULL,
[CompanyName]  NVARCHAR (40) NOT NULL,
[ContactName]  NVARCHAR (30) NULL,
[ContactTitle] NVARCHAR (30) NULL,
[Address]      NVARCHAR (60) NULL,
[City]         NVARCHAR (15) NULL,
[Region]       NVARCHAR (15) NULL,
[PostalCode]   NVARCHAR (10) NULL,
[Country]      NVARCHAR (15) NULL,
[Phone]        NVARCHAR (24) NULL,
[Fax]          NVARCHAR (24) NULL,
[HomePage]     NTEXT         NULL,
CONSTRAINT [PK_Suppliers] PRIMARY KEY CLUSTERED ([SupplierID] ASC)
);

Answer 1

 using (var northwind = new DataClassesDataContext())
            {

                var newSupplier = new Supplier();

                    //SupplierID = northwind.Suppliers.Max(id => id.SupplierID) + 1,
                newSupplier.CompanyName = "Doe Electrical";
                newSupplier.ContactName = "John Doe";
                newSupplier.ContactTitle = "Mr.";
                newSupplier.Address = "123 Fake Street";
                newSupplier.City = "Dublin";
                newSupplier.Region = null;
                newSupplier.PostalCode = "123456";
                newSupplier.Country = "Ireland";
                newSupplier.Phone = "123456789";
                newSupplier.Fax = "987654321";
                newSupplier.HomePage = "Hello World!";


                northwind.Suppliers.InsertOnSubmit(newSupplier);


                try
                {
                    northwind.SubmitChanges();

                    //get identity id  for supplierid
                    var supplierid = newSupplier.SupplierID.ToString();

                    Console.WriteLine("Inserted");
                    Console.ReadLine();
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex);
                    Console.ReadLine();
                    throw;
                }
            }

Linq insert语句不起作用

1 个答案: