How to update SQL Server CE database

Question

I have a question regarding updating a SQL Server CE database using Visual Studio & C#.

I have a database called Database1 which has a table called Cars . The table Cars has 4 columns CarID , Manufacturer , Model and Color . CarID is the primary key and Identity is set to true.

I want to update a record in the database using the CarID column as I may want to update all the other columns - Manufacturer , Model and Color . In the attached project file, I have used the CarID Identity Number 1 but how do I do this without using the CarID Identity number? I understand that I need to declare the CarID somehow but cannot figure out how to do this.

Thanks!

Download Project File

SqlCeConnection conn = new SqlCeConnection(@"Data Source=C:\Users\Dell\Desktop\update\update\Database1.sdf");
        conn.Open();

        SqlCeCommand update = new SqlCeCommand("UPDATE [Cars] SET Manufacturer = @Manufacturer, Model = @Model, Color = @Color WHERE CarID = @CarID", conn);
        update.Parameters.AddWithValue("@CarID", 1);
        update.Parameters.AddWithValue("@Manufacturer", txtManufacturer.Text);
        update.Parameters.AddWithValue("@Model", txtModel.Text);
        update.Parameters.AddWithValue("@Color", txtColor.Text);
        update.ExecuteNonQuery();

        conn.Close();

Answer 1

您无需声明CarID，因为您已经在此列中设置了身份，它将自动填充。