UIL界面層代碼
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Windows.Forms;
9 using System.Data.SqlClient;
10
11 namespace FangWuJiaoYi
12 {
13 public partial class frm_Login : Form
14 {
15 public frm_Login()
16 {
17 InitializeComponent();
18 }
19 public string YongHu;
20 public string YongHu_ID;
21 public string PassWord;
22 DataTable dt;
23 private void btn_DengLu_Click(object sender, EventArgs e)
24 {
25 YongHu = txt_YongHu.Text.ToString().Trim();//獲取用戶名
26 PassWord = txt_PassWord.Text.ToString().Trim();//獲取密碼
27 if (YongHu == "")//判斷用戶名是否為空
28 {
29 MessageBox.Show("請填寫用戶名！!", "溫馨提示：");
30 }
31 else
32 {
33 //鏈接數據庫，查看是否存在該用戶
34 dt = new DataTable();
35 dt = BLL_MainProject.Login.Select_YongHu(YongHu);
36 if (dt.Rows.Count == 0)
37 {
38 MessageBox.Show("不存在該用戶名，請檢查！!", "溫馨提示：");
39 txt_YongHu.Clear();
40 txt_PassWord.Clear();
41 }
42 else
43 {
44 //鏈接數據庫，查看用戶和密碼是否正確
45 dt = new DataTable();
46 dt = BLL_MainProject.Login.Select_YongHu_MiMa(YongHu, PassWord);
47 if (PassWord == "")
48 {
49 MessageBox.Show("請填寫用戶密碼！!", "溫馨提示：");
50 }
51 else if (dt.Rows.Count == 0)
52 {
53 MessageBox.Show("密碼錯誤!!請重新輸入!");
54 txt_PassWord.Clear();
55 txt_PassWord.Focus();
56 }
57 else
58 {
59 YongHu_ID = dt.Rows[0][2].ToString().Trim();//獲取登陸用戶的ID號
60 frm_Main myfrm_Main = new frm_Main();
61 myfrm_Main.YongHuMing = this.YongHu;//傳遞用戶名給主界面
62 myfrm_Main.YuanGong_ID = this.YongHu_ID;//傳遞用戶ID給主界面
63 myfrm_Main.Show();
64 this.Hide();
65 }
66
67 }
68 }
69
70
71 }
72
73 }
74 }
BLL邏輯層代碼
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Data;
6 using System.Data.SqlClient;
7
8 namespace BLL_MainProject
9 {
10 public class Login
11 {
12 //初始化cbo控件
13 public static DataTable Select_YongHu(string YongHu)
14 {
15 //准備調用DAL層方法的對應參數
16 SqlParameter[] SQlCMDpas ={
17 new SqlParameter("@type",SqlDbType.Char),
18 new SqlParameter("@YongHu",SqlDbType.Char),
19 };
20 SQlCMDpas[0].Value = "Select_YongHu";
21 SQlCMDpas[1].Value = YongHu;
22 //實例化DAL層對應的類，調用DAL類，傳入參數
23 DataTable dt = DAL.PublicMethod.DAL_SelectDB_Par("DengLu", SQlCMDpas);
24 return dt;
25 }
26
27 public static DataTable Select_YongHu_MiMa(string YongHu,string PassWord)
28 {
29 //准備調用DAL層方法的對應參數
30 SqlParameter[] SQlCMDpas ={
31 new SqlParameter("@type",SqlDbType.Char),
32 new SqlParameter("@YongHu",SqlDbType.Char),
33 new SqlParameter("@MiMa",SqlDbType.Char)
34 };
35 SQlCMDpas[0].Value = "Select_YongHu_MiMa";
36 SQlCMDpas[1].Value = YongHu;
37 SQlCMDpas[2].Value = PassWord;
38 //實例化DAL層對應的類，調用DAL類，傳入參數
39 DataTable dt = DAL.PublicMethod.DAL_SelectDB_Par("DengLu", SQlCMDpas);
40 return dt;
41 }
42 }
43 }
DAL數據層代碼（PublicMethod）
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Data.SqlClient;
6 using System.Linq;
7 using System.Text;
8
9
10 namespace DAL
11 {
12 public class PublicMethod
13 {
14 //提取數據庫中的數據
15 public static DataTable DAL_SelectDB_Par(string sqlstr, SqlParameter[] SQlCMDpas)
16 {
17 //創建鏈接對象
18 DataPublicVar.sqlcn = new SqlConnection(DataPublicVar.jcglstr.ToString());
19 DataPublicVar.sqlcn.Open();
20 //創建cmd
21 DataPublicVar.sqlstr = sqlstr;
22 DataPublicVar.sqlcmd = new SqlCommand(DataPublicVar.sqlstr, DataPublicVar.sqlcn);
23 DataPublicVar.sqlcmd.CommandType = CommandType.StoredProcedure;
24 //利用數組動態參數化存儲過程的參數
25 foreach (SqlParameter var in SQlCMDpas)
26 {
27 DataPublicVar.sqlcmd.Parameters.Add(var);
28 }
29
30 SqlDataReader dr = DataPublicVar.sqlcmd.ExecuteReader();
31 DataTable dt = new DataTable();
32 dt.Load(dr);
33 DataPublicVar.sqlcn.Close();
34 dr.Close();
35 return dt;
36 //創建鏈接對象
37
38 //DataPublicVar.sqlcn = new SqlConnection(DataPublicVar.jcglstr.ToString());
39 ////創建cmd
40 //DataPublicVar.sqlstr = sqlstr;
41 //DataPublicVar.sqlcmd = new SqlCommand(DataPublicVar.sqlstr, DataPublicVar.sqlcn);
42 //DataPublicVar.sqlcmd.CommandType = CommandType.StoredProcedure;
43 //// //利用數組動態參數化存儲過程的參數
44 //foreach (SqlParameter var in SQlCMDpas)
45 //{
46 // DataPublicVar.sqlcmd.Parameters.Add(var);
47 //}
48
49 //DataTable dt = new DataTable();
50 ////執行SqlDataAdapter
51 //DataPublicVar.sqlda = new SqlDataAdapter(DataPublicVar.sqlcmd);
52 ////填充數據到dt，並返回
53 //DataPublicVar.sqlda.Fill(dt);
54 // return dt;
55
56 }
57
58
59 //插入、更新、刪除數據庫中的數據
60 public static void DAL_OPTableDB_Par(string sqlstr, SqlParameter[] SQlCMDpas)
61 {
62 //創建鏈接對象
63 DataPublicVar.sqlcn = new SqlConnection(DataPublicVar.jcglstr.ToString());
64 DataPublicVar.sqlcn.Open();
65 //創建cmd
66
67 DataPublicVar.sqlstr = sqlstr;
68 DataPublicVar.sqlcmd = new SqlCommand(DataPublicVar.sqlstr, DataPublicVar.sqlcn);
69 DataPublicVar.sqlcmd.CommandType = CommandType.StoredProcedure;
70 //利用數組動態參數化存儲過程的參數
71 foreach (SqlParameter var in SQlCMDpas)
72 {
73 DataPublicVar.sqlcmd.Parameters.Add(var);
74 }
75 DataPublicVar.sqlcmd.ExecuteNonQuery();
76 DataPublicVar.sqlcn.Close();
77 //return i;
78
79 }
80 }
81 }
DAL數據層代碼（DataPublicVar）
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Data;
6 using System.Data.SqlClient;
7
8 namespace DAL
9 {
10 class DataPublicVar
11 {
12 //定義連接字符
13 //public static string jcglstr = Properties.Settings.Default.Setting;
14 public static string jcglstr = @"Data Source=(local);Initial Catalog=房屋交易;Integrated Security=True";
15 public static SqlCommand sqlcmd;//定義命令語句
16 public static string sqlstr;
17 public static SqlDataAdapter sqlda;//定義識別器
18 public static DataSet ds = new DataSet();//定義數據集
19 public static SqlDataReader sqldr;//定義只讀器
20 public static DataTable dt;//定義數據表
21 public static DataRow dr;//定義行
22 public static SqlConnection sqlcn;
23 }
24 }
效果圖
