C#--C/S--学员管理系统--9--考勤打卡和管理员修改密码

以下是学习笔记：

一，考勤打卡

打卡效果如下：

打卡器：刷卡后，自动回车键

 打卡成功：

 实现：

1，后台部分：

在DAL--StudentService学员信息访问类添加代码

        #region 查询学员【根据班级、学号、卡号】

        /// <summary>
        /// 根据班级名称查询学员信息
        /// </summary>
        /// <param name="className"></param>
        /// <returns></returns>
        public List<StudentExt> GetStudentByClass(string className)
        {
            string sql = "select StudentName,StudentId,Gender,Birthday,ClassName from Students";
            sql += " inner join StudentClass on Students.ClassId=StudentClass.ClassId";
            sql += " where ClassName='{0}'";
            sql = string.Format(sql, className);
            SqlDataReader objReader = SQLHelper.GetReader(sql);
            List<StudentExt> list = new List<StudentExt>();
            while (objReader.Read())
            {
                list.Add(new StudentExt()
                    {
                        StudentId = Convert.ToInt32(objReader["StudentId"]),
                        StudentName = objReader["StudentName"].ToString(),
                        Gender = objReader["Gender"].ToString(),
                        Birthday = Convert.ToDateTime(objReader["Birthday"]),
                        ClassName = objReader["ClassName"].ToString()
                    });
            }
            objReader.Close();
            return list;

        }
        /// <summary>
        ///根据学号查询学员对象
        /// </summary>
        /// <param name="studentId"></param>
        /// <returns></returns>
        public StudentExt GetStudentById(string studentId)
        {
            string sql = "select StudentId,StudentName,Gender,Birthday,ClassName,StudentIdNo,PhoneNumber,StudentAddress,CardNo from Students";
            sql += " inner join StudentClass on Students.ClassId=StudentClass.ClassId";
            sql += " where StudentId=" + studentId;
            SqlDataReader objReader = SQLHelper.GetReader(sql);
            StudentExt objStudent = null;
            if (objReader.Read())
            {
                objStudent = new StudentExt()
                {
                    StudentId = Convert.ToInt32(objReader["StudentId"]),
                    StudentName = objReader["StudentName"].ToString(),
                    Gender = objReader["Gender"].ToString(),
                    Birthday = Convert.ToDateTime(objReader["Birthday"]),
                    ClassName = objReader["ClassName"].ToString(),
                    CardNo = objReader["CardNo"].ToString(),
                    StudentIdNo = objReader["StudentIdNo"].ToString(),
                    PhoneNumber = objReader["PhoneNumber"].ToString(),
                    StudentAddress = objReader["StudentAddress"].ToString()
                };
            }
            objReader.Close();
            return objStudent;
        }

        /// <summary>
        /// 根据卡号查询学生信息（请思考如何将上面的方法合并，像下面的方法这么简单）
        /// </summary>
        /// <param name="CardNo"></param>
        /// <returns></returns>
        public StudentExt GetStudentByCardNo(string CardNo)
        {
            string whereSql = string.Format(" where CardNo='{0}'", CardNo);
            return this.GetStudent(whereSql);
        }
        private StudentExt GetStudent(string whereSql)
        {
            string sql = "select StudentId,StudentName,Gender,Birthday,ClassName,";
            sql += "StudentIdNo,PhoneNumber,StudentAddress,CardNo from Students";
            sql += " inner join StudentClass on Students.ClassId=StudentClass.ClassId ";
            sql += whereSql;
            SqlDataReader objReader = SQLHelper.GetReader(sql);
            StudentExt objStudent = null;
            if (objReader.Read())
            {
                objStudent = new StudentExt()
                {
                    StudentId = Convert.ToInt32(objReader["StudentId"]),
                    StudentName = objReader["StudentName"].ToString(),
                    Gender = objReader["Gender"].ToString(),
                    Birthday = Convert.ToDateTime(objReader["Birthday"]),
                    ClassName = objReader["ClassName"].ToString(),
                    CardNo = objReader["CardNo"].ToString(),
                    StudentIdNo = objReader["StudentIdNo"].ToString(),
                    PhoneNumber = objReader["PhoneNumber"].ToString(),
                    StudentAddress = objReader["StudentAddress"].ToString()
                };
            }
            objReader.Close();
            return objStudent;
        }
        #endregion

　2，前端UI部分：

        public FrmAttendance()//窗体构造函数
        {
            InitializeComponent();
            timer1_Tick(null, null);//避免时间显示的延迟
        }

        //显示当前时间
        private void timer1_Tick(object sender, EventArgs e)
        {
            this.lblYear.Text = DateTime.Now.Year.ToString();
            this.lblMonth.Text = DateTime.Now.Month.ToString();
            this.lblDay.Text = DateTime.Now.Day.ToString();
            this.lblTime.Text = DateTime.Now.ToLongTimeString();
            switch (DateTime.Now.DayOfWeek)
            {
                case DayOfWeek.Tuesday:
                    this.lblWeek.Text = "二";
                    break;
                case DayOfWeek.Wednesday:
                    this.lblWeek.Text = "三";
                    break;
                case DayOfWeek.Thursday:
                    this.lblWeek.Text = "四";
                    break;
                case DayOfWeek.Monday:
                    this.lblWeek.Text = "一";
                    break;
                case DayOfWeek.Saturday:
                    this.lblWeek.Text = "六";
                    break;
                case DayOfWeek.Friday:
                    this.lblWeek.Text = "五";
                    break;
                case DayOfWeek.Sunday:
                    this.lblWeek.Text = "日";
                    break;
            }
        }
        //学员打卡
        private AttendanceService objAttendanceService = new AttendanceService();
        private void txtStuCardNo_KeyDown(object sender, KeyEventArgs e)
        {
            if (this.txtStuCardNo.Text.Trim().Length != 0 && e.KeyValue == 13)
            {
                //显示学员信息
                StudentExt objStu = new StudentService().GetStudentByCardNo(this.txtStuCardNo.Text.Trim());
                if (objStu == null)
                {
                    MessageBox.Show("卡号不正确！", "信息提示");
                    this.txtStuCardNo.SelectAll();
                    return;
                }
                this.lblStuName.Text = objStu.StudentName;
                this.lblStuClass.Text = objStu.ClassName;
                this.lblStuId.Text = objStu.StudentId.ToString();
                //添加打卡信息
                string result = objAttendanceService.AddRecord(this.txtStuCardNo.Text.Trim());
                if (result != "success")
                {
                    this.lblInfo.Text = "打卡失败！";
                    MessageBox.Show(result, "错误提示");
                }
                else
                    this.lblInfo.Text = "打卡成功！";
                this.txtStuCardNo.Text = ""; //等待下一个打卡
                this.txtStuCardNo.Focus();
            }
        }　　

　二，管理员修改密码：

 1，后台部分

在DAL--SysAdminService管理数据访问类中添加

namespace DAL
{
    /// <summary>
    /// 管理员数据访问类
    /// </summary>
    public class SysAdminService
    {
        /// <summary>
        /// 根据登录账号和密码登录
        /// </summary>
        /// <param name="objAdmin">封装了登录账号和密码的管理员对象</param>
        /// <returns>返回包含管理员信息的对象</returns>
        public SysAdmin AdminLogin(SysAdmin objAdmin)
        {
            //组合SQL语句
            string sql = "select AdminName from Admins where LoginId={0}  and LoginPwd='{1}'";
            sql = string.Format(sql, objAdmin.LoginId, objAdmin.LoginPwd);
            //从数据库中查询
            SqlDataReader objReader = SQLHelper.GetReader(sql);
            if (objReader.Read())
            {
                objAdmin.AdminName = objReader["AdminName"].ToString();
            }
            else
            {
                objAdmin = null;//如果登录不成功，则将当前对象清空
            }
            objReader.Close();
            //返回结果
            return objAdmin;
        }

        /// <summary>
        /// 修改管理员密码
        /// </summary>
        /// <param name="objAdmin"></param>
        /// <returns></returns>
        public int ModifyPwd(SysAdmin objAdmin)
        {
            string sql = "update Admins set LoginPwd='{0}' where LoginId={1}";
            sql = string.Format(sql, objAdmin.LoginPwd, objAdmin.LoginId);
            try
            {
                return SQLHelper.Update(sql);
            }
            catch (SqlException)
            {
                throw new Exception("应用程序和数据库连接出现问题！");
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
}

　　2，前端UI：

确认修改的按钮事件

        //修改密码
        private void btnModify_Click(object sender, EventArgs e)
        {
            #region 密码验证
            if (this.txtOldPwd.Text.Trim().Length == 0)
            {
                MessageBox.Show("请输入原密码！", "提示信息");
                this.txtOldPwd.Focus();
                return;
            }
            if (this.txtOldPwd.Text.Trim() != Program.objCurrentAdmin.LoginPwd)
            {
                MessageBox.Show("请输入的原密码不正确！", "提示信息");
                this.txtOldPwd.Focus();
                this.txtOldPwd.SelectAll();
                return;
            }
            if (this.txtNewPwd.Text.Trim().Length == 0)
            {
                MessageBox.Show("请输入不少于6位的新密码！", "提示信息");
                this.txtNewPwd.Focus();
                return;
            }
            if (this.txtNewPwd.Text.Trim().Length < 6)
            {
                MessageBox.Show("新密码长度不能少于6位！", "提示信息");
                this.txtNewPwd.Focus();
                return;
            }
            if (this.txtNewPwdConfirm.Text.Trim().Length == 0)
            {
                MessageBox.Show("请再次输入新密码！", "提示信息");
                this.txtNewPwdConfirm.Focus();
                return;
            }
            if (this.txtNewPwdConfirm.Text.Trim() != this.txtNewPwd.Text.Trim())
            {
                MessageBox.Show("两次输入的新密码不一致！", "提示信息");
                return;
            }
            #endregion

            //修改密码
            try
            {
                SysAdmin objAdmin = new SysAdmin()
                {
                    LoginId = Program.objCurrentAdmin.LoginId,
                    LoginPwd = this.txtNewPwd.Text.Trim()
                };
                if (new SysAdminService().ModifyPwd(objAdmin) == 1)
                {
                    MessageBox.Show("密码修改成功，请妥善保管！", "成功提示");
                    //同时修改当前保存的用户密码
                    Program.objCurrentAdmin.LoginPwd = this.txtNewPwd.Text.Trim();
                    this.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }