.Net Entity Framework Example

Entity Framework ของ .Net เป็น ORM ที่ใช้งานได้ง่ายดีครับแต่ Tool Wizard ต่างๆทำให้มี Code ที่ถูกซ่อนเยอะแยะเลยหวั่นใจจริงๆ

public static void Main(){
 using (var em = new MyEntities())
            {

                Material m = new Material();
                m.Name = "Material 3";
                m.Price = 436;
                m.GrpId = 1;

                em.AddObject("Materials", m);
                Console.WriteLine("Add mtrl id {0}",m.MtrlId);
                //or
                //em.Materials.AddObject(m);

                em.SaveChanges();

                /* Native Query */
                ObjectQuery<DbDataRecord> results = new ObjectQuery<DbDataRecord>("SELECT m.MtrlId,m.Name as Name,m.Price FROM Materials as m", em);
                Console.WriteLine("result= " + results);
                foreach (var item in results)
                {
                    Console.WriteLine("result= Id {0}, Name {1}", item[0], item["Name"]);
                }

                /* LINQ */
                var query = from mtrl in em.Materials
                            select mtrl;
                foreach (var item in query) {
                    Console.WriteLine("LINQ result Id {0}, Name {1}, Price {2}", item.MtrlId, item.Name,item.Price);
                }
            }
} //end main method

About WK

Kajook is a Senior Software Engineer. Job is Design & Develop in Java EE environment on Glassfish. I'm Interested in Agile software development ,iOS and Android.
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