①UI层
string userName=txtUserName.Text.Trim();
string password = txtPassword.Text;
Login.BLL.LoginService mgr = new Login.BLL.LoginService();
Login.Model.UserInfo user = mgr.UserLogin(userName, password);
MessageBox.Show("登陆用户:" + user.UserName);
②BLL层
Login.DAL.UserDAO uDao = new Login.DAL.UserDAO();
Login .Model .UserInfo user= uDao.SelectUser(userName, password);
③DAL层-UserDAO
using (SqlConnection conn = new SqlConnection(DbUtil.ConnString))
{
SqlCommand cmd = conn.CreateCommand();//创建SqlCommand对象
cmd.CommandText = @"SELECT *
FROM Uers WHERE UserName=@UserName AND Password=@Password";
cmd.CommandType = CommandType.Text;
cmd.Parameters.Add(new SqlParameter("@UserName", userName));
cmd.Parameters.Add(new SqlParameter("@Password", password));
conn.Open();
SqlDataReader reader= cmd.ExecuteReader();
Login.Model.UserInfo user = null;
while (reader.Read())
{
if (user == null)
{
user = new Login.Model.UserInfo();
}
user.ID= reader.GetInt32(0);
user.UserName = reader.GetString(1);
user.Password=reader.GetString (2);//not suggestion
if (!reader.IsDBNull(3))
{
user.Email = reader.GetString(3);
}
}
return user;
}
④BLL层
if (user != null)
{
Login.DAL.ScoreDAO sDao = new Login.DAL.ScoreDAO();
sDao.UpateScore(userName, 10);
return user;
}
else
{
throw new Exception("登陆失败。");
}
⑤DAL层-ScoreDAO
using (SqlConnection conn = new SqlConnection(DbUtil.ConnString))
{
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = @"INSERT INTO Scores (UserName,Score)Values(@UserName,@Score)";
cmd.Parameters.Add(new SqlParameter("@UserName", userName));
cmd.Parameters.Add(new SqlParameter("@Score", value));
conn.Open();
cmd.ExecuteNonQuery();
}
⑥返回BLL层
运行代码,使分数加10
⑦返回UI层
显示信息