Asp.Net - MVC-用sql代码实现增删改查

查询：

 public ActionResult Index()
        {
            //ViewBag.EmpList = db.Employee;

            //联合查询
           
            string sql = "select * from Employee e join Dept d on e.DeptId = d.DeptId";
            ViewBag.EmpList = db.Database.SqlQuery(typeof(EmployeeViewModel), sql);
            ViewBag.DeptList = db.Dept;
            return View();
       

模糊查询： 

        [HttpPost]
        public ActionResult Index(string EmpName,int DeptId)
        {
            string sql = "select * from Employee e join Dept d on e.DeptId = d.DeptId where 1=1 ";
            sql += (EmpName != "") ? " and EmpName like @EmpName" : "";
            sql += (DeptId != 0) ? " and e.DeptId=@DeptId" : "";
            SqlParameter[] paras =
            {
                new SqlParameter("@EmpName","%"+EmpName+"%"),
                new SqlParameter("@DeptId",DeptId)
            };
            ViewBag.EmpList = db.Database.SqlQuery(typeof(EmployeeViewModel), sql, paras);

            ViewBag.EmpName = EmpName;
            ViewBag.DeptId = DeptId;
            ViewBag.DeptList = db.Dept;

            return View();
        }

 Index页面添加员工姓名，部门名称及查询按钮：

 
员工信息列表
        

            员工姓名： 
            部门名称： 
                --请选择--
                @foreach (var item in ViewBag.DeptList)
                {
                    @item.DeptName
                }
            
            
        
        添加员工

 

添加： 

 //添加员工
       public ActionResult AddEmp()
        {
            // Employee emp = new Employee()
            // {
            //     EmpName = Request["EmpName"],
            //     DeptId = int.Parse(Request["DeptId"]),
            //     EmpPhone = Request["EmpPhone"],
            //     EmpArea = Request["EmpArea"],
            //     EmpSalary =decimal.Parse(Request["EmpSalary"])
            // };
            // db.Employee.Add(emp);
            //int count = db.SaveChanges();
            string sql = "insert into Employee(EmpName,DeptId,EmpPhone,EmpArea,EmpSalary)values (@EmpName,@DeptId,@EmpPhone,@EmpArea,@EmpSalary)";
            SqlParameter[] ps =
            {
                new SqlParameter ("@EmpName", Request["EmpName"]),
                new SqlParameter ("@DeptId",int.Parse(Request["DeptId"])),
                new SqlParameter ("@EmpPhone",Request["EmpPhone"]),
                new SqlParameter ("@EmpArea",Request["EmpArea"]),
                new SqlParameter ("@EmpSalary",decimal.Parse(Request["EmpSalary"]))
            };
            int count = db.Database.ExecuteSqlCommand(sql,ps );
            if (count>0)
            {
                return Content("");
            }
            else
            {
                return Content("");
            }

        }

 修改：

 //编辑员工页面
        public ActionResult EditEmpForm()
        {
            ViewBag.DeptList = db.Dept;
            //获取主键
            ViewBag.Emp = db.Employee.Find(int.Parse(Request["EmpId"]));
            return View();
        }
        //编辑员工
       public ActionResult EditEmp()
        {
            //获取主键
            int EmpId = int.Parse(Request["EmpId"]);

            //1.EF框架执行修改操作
            //var emp = db.Employee.Find(EmpId);
            //emp.EmpName = Request["EmpName"];
            //emp.DeptId = int.Parse(Request["DeptId"]);
            //emp.EmpPhone = Request["EmpPhone"];
            //emp.EmpArea = Request["EmpArea"];
            //emp.EmpSalary = decimal.Parse(Request["EmpSalary"]);

            //int count = db.SaveChanges();

            //2.EF框架执行sql语句
            string sql = "update Employee set DeptId=@DeptId,EmpName=@EmpName,EmpPhone=@EmpPhone,EmpArea=@EmpArea,EmpSalary=@EmpSalary where EmpId=@EmpId";
            SqlParameter[] paras =
            {
                new SqlParameter("@DeptId", int.Parse(Request["DeptId"])),
                new SqlParameter("@EmpName", Request["EmpName"]),
                new SqlParameter("@EmpPhone", Request["EmpPhone"]),
                new SqlParameter("@EmpArea", Request["EmpArea"]),
                new SqlParameter("@EmpSalary", decimal.Parse(Request["EmpSalary"])),
                new SqlParameter("@EmpId", EmpId)
            };
            int count = db.Database.ExecuteSqlCommand(sql, paras);
            if (count > 0)
            {
                return Content("");
            }
            else
            {
                return Content("");
            }
        }

删除： 

 //删除员工
        public ActionResult DeleteEmp()
        {
            //获取主键
            int EmpId = int.Parse(Request["EmpId"]);
            string sql = "delete from Employee where EmpId=@EmpId";
            SqlParameter empId = new SqlParameter("@EmpId", EmpId);
            int count = db.Database.ExecuteSqlCommand(sql, empId);
            //var emp = db.Employee.Find(EmpId);
            //db.Employee.Remove(emp);
            //int count = db.SaveChanges();
            if (count > 0)
            {
                return Content("");
            }
            else
            {
                return Content("");
            }
        }