EntityFramework 数据操作

EntityFramework 4.3 数据操作

 using (TestEntities te = new TestEntities())
            {
                //增加数据
                //Table01 t01 = new Table01();
                //t01.Name = "Name01";
                //t01.Age = 21;
                //t01.NDate1 = DateTime.Now;
                //te.Table01.AddObject(t01);
                //te.SaveChanges();
                //增加数据完成

                //修改数据
                //Table01 t01 = te.Table01.Where(t => t.ID == 1).SingleOrDefault<Table01>();
                //t01.Name = "Name02";
                //te.SaveChanges();
                //修改数据完成

                //删除数据
                //Table01 t01 = te.Table01.Where(t => t.ID == 1).SingleOrDefault<Table01>();
                //te.DeleteObject(t01);
                //te.SaveChanges();
                //删除数据完成

                //查询单表
                //var result = te.Table01.Where(t => t.ID == 1).SingleOrDefault<Table01>();
                // 或
                //var result = (from t in te.Table01
                //              where t.ID == 1
                //              select t).SingleOrDefault<Table01>();
                //查询单表完成

                //多表联合查询
                //var result = (from t01 in te.Table01
                //              join t02 in te.Table02
                //              on t01.ID equals t02.Table01ID
                //              orderby t01.ID ascending
                //              select new { t01, t02 }).ToList();
                //多表联合查询完成

                //多表联合查询-左关联
                //var result = (from t01 in te.Table01
                //              join t02 in te.Table02
                //              on t01.ID equals t02.Table01ID
                //              into xing
                //              from t02 in xing.DefaultIfEmpty()
                //              orderby t01.ID descending
                //              select new { t01, t02 }).ToList();
                //多表联合查询完成-左关联

                //多表联合查询-右关联
                //var result = (from t02 in te.Table02
                //              join t01 in te.Table01
                //              on t02.Table01ID equals t01.ID
                //              into xing
                //              from t01 in xing.DefaultIfEmpty()
                //              orderby t01.ID ascending
                //              select new { t02, t01 }).ToList();
                //多表联合查询完成-右关联


                //执行存储过程
                var result = te.TestProc().ToList();
                //执行存储过程完成
            }