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);
}
}