1.界面
1.1登陆界面
图1.PNG
1.2录入界面
图2.PNG
2.代码
2.1登陆查询
String connStr = ConfigurationManager.ConnectionStrings["Attendance"].ConnectionString;
SqlConnection sqlConn = new SqlConnection(connStr);
try
{
// 连接数据库
sqlConn.Open();
// 构造命令发送给数据库
String sqlStr = "select * from EMPLOYEE where ID=@id and PASSWORD=@pwd";
SqlCommand cmd = new SqlCommand(sqlStr, sqlConn);
// 注意是用用户ID登录，而不是用户名，用户名可能会重复
cmd.Parameters.Add(new SqlParameter("@id", this.tb_User.Text.Trim()));
cmd.Parameters.Add(new SqlParameter("@pwd", this.tb_Password.Text.Trim()));
SqlDataReader dr = cmd.ExecuteReader();
// 如果从数据库中查询到记录，则表示可以登录
if (dr.HasRows)
{
dr.Read();
UserInfo.userId = int.Parse(dr["ID"].ToString());
UserInfo.userName = dr["NAME"].ToString();
UserInfo.userPwd = dr["PASSWORD"].ToString();
UserInfo.userRole = dr["ROLE"].ToString();
UserInfo.userDepartment = dr["DEPARTMENT"].ToString();
UserInfo.userGender = dr["GENDER"].ToString();
MessageBox.Show(UserInfo.userRole + "登录成功");
if (UserInfo.userRole == "收银员")
{
// 显示收银员主界面
//MainFormUser formUser = new MainFormUser();
//formUser.Show();
//// 隐藏登录界面
//this.Hide();
}
if (UserInfo.userRole == "库管员")
{
//// 显示库管员主界面
//MainFormAdmin formAdmin = new MainFormAdmin();
//formAdmin.Show();
//// 隐藏登录界面
//this.Hide();
}
}
else
{
MessageBox.Show("用户名或密码错误", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
catch (Exception exp)
{
MessageBox.Show("访问数据库错误：" + exp.Message);
}
finally
{
sqlConn.Close();
}
2.2录入信息
String ID = this.tb_id.Text.Trim();
String NAME = this.tb_name.Text.Trim();
String GENDER = this.tb_gender.Text.Trim();
String DEPARTMENT = this.tb_department.Text.Trim();
String ROLE = this.tb_role.Text.Trim();
String PASSWORD = this.tb_password.Text.Trim();
// 连接字符串，注意与实际环境保持一致
String connStr = ConfigurationManager.ConnectionStrings["Attendance"].ConnectionString;
SqlConnection sqlConn = new SqlConnection(connStr);
try
{
// 连接数据库
sqlConn.Open();
// 构造命令
String sqlStr = "insert into employee(id, name,gender, department, role, password ) values(@ID, @NAME, @GENDER, @DEPARTMENT, @ROLE, @PASSWORD)";
SqlCommand cmd = new SqlCommand(sqlStr, sqlConn);
// SQL字符串参数赋值
cmd.Parameters.Add(new SqlParameter("@ID", ID));
cmd.Parameters.Add(new SqlParameter("@NAME", NAME));
cmd.Parameters.Add(new SqlParameter("@GENDER", GENDER));
cmd.Parameters.Add(new SqlParameter("@DEPARTMENT", DEPARTMENT));
cmd.Parameters.Add(new SqlParameter("@ROLE", ROLE));
cmd.Parameters.Add(new SqlParameter("@PASSWORD", PASSWORD));
// 将命令发送给数据库
int res = cmd.ExecuteNonQuery();
// 根据返回值判断是否插入成功
if (res != 0)
{
MessageBox.Show("信息注册成功");
}
else
{
MessageBox.Show("信息注册失败");
}
}
catch (Exception exp)
{
MessageBox.Show("访问数据库错误：" + exp.Message);
}
finally
{
sqlConn.Close();
}
2.3读取数据库信息
tb_gender.SelectedIndex = 0;
tb_role.SelectedIndex = 0;
String connStr = ConfigurationManager.ConnectionStrings["Attendance"].ConnectionString;
SqlConnection sqlConn = new SqlConnection(connStr);
sqlConn.Open();
String sqlStr0 = "select MAX(id+1) as id from employee";
SqlCommand cmd = new SqlCommand(sqlStr0, sqlConn);
SqlDataReader co = cmd.ExecuteReader();
if (co.HasRows)
{
co.Read();
tb_id.Text = co["ID"].ToString();
}
sqlConn.Close();
sqlConn.Open();
String sqlStr1 = "select distinct (department) from employee";
SqlCommand com = new SqlCommand(sqlStr1, sqlConn);
SqlDataReader xo = com.ExecuteReader();
if (xo.HasRows)
{
while (xo.Read())
tb_department.Items.Add(xo["department"].ToString());
}
tb_department.SelectedIndex = 0;
sqlConn.Close();
