【C#重构】——注册

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教师端给学生注册功能
数据库worklog_info 表

功能实现：
注册学号、姓名、状态、充值金额 点击注册后卡号自动生成，返回在卡号一栏

U层

        /// <summary>
        /// 点击注册
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSave_Click(object sender, EventArgs e)
        {
            //判断是否为空
            if (txtSID.Text.Trim() == ""|| txtName.Text.Trim() == ""|| cmbState.Text.Trim() == ""|| txtRecharge.Text.Trim()=="")
            {
                MessageBox.Show("请把信息填写完整", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            try
            {
                //实例化实体层
                Entity.StudentInfo student = new Entity.StudentInfo();
                student.StudentID= Convert.ToInt32(txtSID.Text.Trim());
                student.Studentname = txtName.Text.Trim();
                student.Status = cmbState.Text.Trim();
                student.Balance = Convert.ToInt32(txtRecharge.Text.Trim());

                //外观层实例化
                //查找数据库中学号是否注册过
                DataTable table;
                Boolean flag;
                Facade.StudentFacade facade = new Facade.StudentFacade();
                flag = facade.SelectStudentIDFacade(student);
                
                //如果没有被注册
                if (flag!=false)
                {
                    //把注册信息插入数据库表
                    table = facade.InsterStudentFacade(student);
                    DataTable table1 = facade.SelectUserIDFacade(student);
                    //插入一行后不为空，卡号返回
                    if (table1.Rows.Count != 0)
                    {
                        student.UserID = Convert.ToInt32(table1.Rows[0][0].ToString().Trim());
                        txtCardNO.Text = Convert.ToString (student.UserID);
                        MessageBox.Show("卡号注册成功！", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    }
                    else
                    {
                        MessageBox.Show("找不到卡号请联系管理员！", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    }
                }
                else
                {
                    MessageBox.Show("学号已经注册过！", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Facade层

public  class RechargeFacade
    {
        /// <summary>
        /// 查询student表，核对学号是否被注册
        /// </summary>
        /// <param name="student"></param>
        /// <returns></returns>
        public DataTable SelectStudentFacade(Entity.StudentInfo student)
        {
            BLL.RechargeBLL bll = new BLL.RechargeBLL();
            DataTable table = bll.SelectStudnetBLL(student);
            return table;
        }
        /// <summary>
        /// 插入注册信息入表
        /// </summary>
        /// <param name="money"></param>
        /// <returns></returns>
        public DataTable InsertRechargeFacade(Entity.RechargeInfo money)
        {
            BLL.RechargeBLL bll = new BLL.RechargeBLL();
            DataTable table = bll.InsertRechargeBLL(money);
            return table;
        }
        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="student"></param>
        /// <returns></returns>
        public DataTable UpdateStudentFacade(Entity.StudentInfo student)
        {
            BLL.RechargeBLL bll = new BLL.RechargeBLL();
            DataTable table = bll.UpdateStudentBLL(student);
            return table;
        }
    }

BLL层

public class RechargeBLL
    {
        public DataTable SelectStudnetBLL(Entity.StudentInfo student)
        {
            Factory.RechargeFactory factory = new Factory.RechargeFactory();
            IDAL.IRechargeIDL dll = factory.CreateUser();
            DataTable table = dll.SelectStudent(student);
            return table;
        }
        public DataTable InsertRechargeBLL(Entity.RechargeInfo money)
        { 
            Factory.RechargeFactory factory = new Factory.RechargeFactory();
            IDAL.IRechargeIDL dll = factory.CreateUser();
            DataTable table = dll.InsertRecharge(money);
            return table;
        }

        public DataTable UpdateStudentBLL(Entity.StudentInfo student)
        {
            Factory.RechargeFactory factory = new Factory.RechargeFactory();
            IDAL.IRechargeIDL dll = factory.CreateUser();
            DataTable table = dll.UpdateStudent(student);
            return table;
        }
    }

DAL层

public class RechargeDAL:IDAL.IRechargeIDL
    {
        /// <summary>
        /// 查询学生表的初始注册钱+学生注册状态
        /// </summary>
        /// <param name="student"></param>
        /// <returns></returns>
        public DataTable SelectStudent(Entity.StudentInfo student)
        {
            SQLHelper sqlHelper = new SQLHelper();
            SqlParameter[] sqlParams = { new SqlParameter("@UserID", student.UserID) };
            String sql = "Select * from student_info where userID =@UserID ";
            DataTable table = sqlHelper.ExecuteQuery(sql, sqlParams, CommandType.Text);
            return table;
        }
        public DataTable InsertRecharge(Entity.RechargeInfo money)
        {
            DateTime date = DateTime.Now;
            SQLHelper sqlHelper = new SQLHelper();
            SqlParameter[] sqlParams = { new SqlParameter("@CardNO",money.UserID),
                                         new SqlParameter("@Date",date.ToShortDateString()),
                                         new SqlParameter("@Status",money.Status),
                                         new SqlParameter("@Addmoney",money.Addmoney)};
            String sql = "Insert into recharge_info(userID,addmoney,date,status) Values(@CardNO,@Addmoney,@Date,@Status)";
            DataTable table = sqlHelper.ExecuteNonQuery(sql,sqlParams,CommandType.Text);
            return table;
        }

        public DataTable UpdateStudent(Entity.StudentInfo student)
        {
            SQLHelper sqlHelper = new SQLHelper();
            SqlParameter[] sqlParams = { new SqlParameter("@Balance",student.Balance)};
            String sql = "Update student_info Set balance =@Balance ";
            DataTable table = sqlHelper.ExecuteNonQuery(sql,sqlParams,CommandType.Text);
            return table;
        }
    }