EF常用查询语句

//方法一 Linq to Entities
            var info = from p in entity.Users where p.ID >= 10 orderby p.ID descending select p;
            foreach (var item in info)
            {
                Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
            }

// 方法二：Lamada表达式
            var info2 = entity.Users.Where<User>(p => p.ID >= 10).OrderByDescending(p => p.ID);
            foreach (var item in info)
            {
                Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
            }

// 方法三：Entity SQL Language
            string strSQL = "SELECT value a FROM Users as a WHERE a.ID>=10 ORDER BY a.ID DESC";
            var info3 = ((IObjectContextAdapter)entity).ObjectContext.CreateQuery<User>(strSQL);
            foreach (var item in info)
            {
                Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
            }

// 方法四：SqlQuery
            try
            {
                string strSQL2 = "SELECT * FROM Users WHERE ID>=10 ORDER BY ID DESC";
                var info4 = entity.Database.SqlQuery<User>(strSQL2);
                foreach (var item in info)
                {
                    Console.WriteLine("ID:" + item.ID + " " + "登录名:" + item.LoginName + " " + "密码:" + item.Password);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

巴特西

EF常用查询语句

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