Net学习日记_三层_3

三层之间的关系

CommandType 区别和应用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace GZItcastSim
{
    public partial class FTest : Form
    {
        public FTest()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("server=.;database=heimablog;uid=sa;pwd=suncoder");
            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "EXEC dbo.usp_GetStuPage @pageindex,@pagesize ,@pagecount OUTPUT";

            //创建参数对象
            SqlParameter sp=new SqlParameter();
            sp.ParameterName="@pagecount";
            sp.SqlDbType= SqlDbType.Int;
            sp.Direction = ParameterDirection.Output;

            cmd.Parameters.Add(new SqlParameter("@pageindex", SqlDbType.Int) { Value = 1 });
            cmd.Parameters.Add(new SqlParameter("@pagesize", SqlDbType.Int) { Value = 10 });
            cmd.Parameters.Add(sp);

            //cmd.CommandType = CommandType.Text;
            conn.Open();
            cmd.ExecuteReader();
            //只有调用了Execute之后，输出参数对象的 Value 才有值
            object obj = sp.Value;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("server=.;database=heimablog;uid=sa;pwd=suncoder");
            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "dbo.usp_GetStuPage";

            //创建参数对象
            SqlParameter sp = new SqlParameter();
            sp.ParameterName = "@pagecount";
            sp.SqlDbType = SqlDbType.Int;
            sp.Size = 4000;//如果输出参数是字符串的，那么必须制定长度，否则长度为0
            sp.Direction = ParameterDirection.Output;

            cmd.Parameters.Add(new SqlParameter("@pageindex", SqlDbType.Int) { Value = 1 });
            cmd.Parameters.Add(new SqlParameter("@pagesize", SqlDbType.Int) { Value = 10 });
            cmd.Parameters.Add(sp);
            //cmd在执行的时候，会自动的把参数加上去

            cmd.CommandType = CommandType.StoredProcedure;

            conn.Open();
            cmd.ExecuteReader();
            //只有调用了Execute之后，输出参数对象的 Value 才有值
            object obj = sp.Value;
        }
    }
}

MD5加密问题

epwd = FormsAuthentication.HashPasswordForStoringInConfigFile(epwd, "MD5");

其实就是一句代码的问题，就是在用户输入数据库的时候，转换成MD5值；

然后判断时候输入值与数据库值均是用MD5值来进行判断，准确性能高。

发送邮件静态类

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Net.Mail;

namespace Comm
{
    public class MailUnit
    {
        public string smtp;
        public string from;
        public string pwd;
        public string to;
        public string title;
        public string body;
        public ArrayList paths;
        /// <summary>
        /// 发送邮件单元类
        /// </summary>
        /// <param name="Psmtp">SMYP服务器地址</param>
        /// <param name="Pfrom">发件人地址</param>
        /// <param name="Ppwd">发件人密码</param>
        /// <param name="Pto">收件人地址</param>
        /// <param name="Ptitle">主题</param>
        /// <param name="Pbody">正文</param>
        /// <param name="Ppaths"></param>
        public MailUnit(string Psmtp, string Pfrom, string Ppwd, string Pto, string Ptitle, string Pbody, ArrayList Ppaths)
        {
            smtp = Psmtp; from = Pfrom; pwd = Ppwd; to = Pto; title = Ptitle; body = Pbody; paths = Ppaths;
        }
        /*发邮件*/
        public bool SendMail()
        {
            //创建smtpclient对象
            System.Net.Mail.SmtpClient client = new SmtpClient();
            client.Host = smtp;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(from, pwd);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            //创建mailMessage对象 
            System.Net.Mail.MailMessage message = new MailMessage(from, to);
            message.Subject = title;
            //正文默认格式为html
            message.Body = body;
            message.IsBodyHtml = true;
            message.BodyEncoding = System.Text.Encoding.UTF8;
            //添加附件
            if (paths!=null && paths.Count != 0)
            {
                foreach (string path in paths)
                {
                    Attachment data = new Attachment(path, System.Net.Mime.MediaTypeNames.Application.Octet);
                    message.Attachments.Add(data);
                }
            }
            try { client.Send(message); return true; }//MessageBox.Show("邮件发送成功."); 
            catch (Exception ex) { return false; }//MessageBox.Show("邮件发送失败." + ex.ToString());
        }
    }
}

NPOIS

用于中文判断拼音等问题。并没有听太懂。