传智播客数据绑定和数据库开发基础(第四季)-杨中科
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传智播客数据绑定和数据库开发基础(第四季)-杨中科
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(一)數(shù)據(jù)綁定、ListBox、DataGrid SQLServer基礎(chǔ)、SQLServer使用主鍵策略
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(二)DataReader、DataSet、參數(shù)化查詢、防注入漏洞攻擊、SQLHelper
用戶界面中進(jìn)行登錄判斷。輸錯(cuò)三次禁止登陸（半小時(shí)），用數(shù)據(jù)庫(kù)記錄ErrorTimes。 數(shù)據(jù)導(dǎo)入：從文本文件導(dǎo)入用戶信息。易錯(cuò)點(diǎn)：Parameter的重復(fù)添加。File.ReadAllLines() 數(shù)據(jù)導(dǎo)出：將用戶信息導(dǎo)出到文本文件。File.WriteAllLines()
省市聯(lián)動(dòng)選擇 手機(jī)號(hào)碼歸屬地查詢
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 adonet 12 { 13 public partial class Form1 : Form 14 { 15 public Form1() 16 { 17 InitializeComponent(); 18 } 19 20 private void button1_Click(object sender, EventArgs e) 21 { 22 SqlHelper.ExecuteNonQuery("insert into T_Student(Name,Age) values('a',33)"); 23 DataTable table = SqlHelper.ExecuteDataTable("select * from T_Student where Age=@Age or Name=@Name", 24 new SqlParameter("@Age", 26), new SqlParameter("name", "劉洋")); 25 foreach (DataRow row in table.Rows) 26 { 27 string name = (string)row["name"]; 28 MessageBox.Show(name); 29 } 30 } 31 } 32 } View Code 1 namespace adonet 2 { 3 partial class Form1 4 { 5 /// <summary> 6 /// 必需的設(shè)計(jì)器變量。 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// 清理所有正在使用的資源。 12 /// </summary> 13 /// <param name="disposing">如果應(yīng)釋放托管資源，為 true；否則為 false。</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows 窗體設(shè)計(jì)器生成的代碼 24 25 /// <summary> 26 /// 設(shè)計(jì)器支持所需的方法 - 不要 27 /// 使用代碼編輯器修改此方法的內(nèi)容。 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.button1 = new System.Windows.Forms.Button(); 32 this.SuspendLayout(); 33 // 34 // button1 35 // 36 this.button1.Location = new System.Drawing.Point(88, 78); 37 this.button1.Name = "button1"; 38 this.button1.Size = new System.Drawing.Size(75, 23); 39 this.button1.TabIndex = 0; 40 this.button1.Text = "button1"; 41 this.button1.UseVisualStyleBackColor = true; 42 this.button1.Click += new System.EventHandler(this.button1_Click); 43 // 44 // Form1 45 // 46 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 47 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 48 this.ClientSize = new System.Drawing.Size(284, 261); 49 this.Controls.Add(this.button1); 50 this.Name = "Form1"; 51 this.Text = "Form1"; 52 this.ResumeLayout(false); 53 54 } 55 56 #endregion 57 58 private System.Windows.Forms.Button button1; 59 } 60 } View Code 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Windows.Forms; 5 6 namespace adonet 7 { 8 static class Program 9 { 10 /// <summary> 11 /// 應(yīng)用程序的主入口點(diǎn)。 12 /// </summary> 13 [STAThread] 14 static void Main() 15 { 16 Application.EnableVisualStyles(); 17 Application.SetCompatibleTextRenderingDefault(false); 18 Application.Run(new Form1()); 19 } 20 } 21 } View Codesqlhelper
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Data.SqlClient; 6 using System.Configuration; 7 using System.Data; 8 9 namespace adonet 10 { 11 class SqlHelper 12 { 13 private static string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString; 14 15 public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters) 16 { 17 using (SqlConnection conn = new SqlConnection(connStr)) 18 { 19 conn.Open(); 20 using (SqlCommand cmd = conn.CreateCommand()) 21 { 22 cmd.CommandText = sql; 23 cmd.Parameters.AddRange(parameters); 24 return cmd.ExecuteNonQuery(); 25 } 26 } 27 } 28 29 public static object ExecuteScalar(string sql, params SqlParameter[] parameters) 30 { 31 using (SqlConnection conn = new SqlConnection(connStr)) 32 { 33 conn.Open(); 34 using (SqlCommand cmd = conn.CreateCommand()) 35 { 36 cmd.CommandText = sql; 37 cmd.Parameters.AddRange(parameters); 38 return cmd.ExecuteScalar(); 39 } 40 } 41 } 42 43 public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parameters) 44 { 45 using (SqlConnection conn = new SqlConnection(connStr)) 46 { 47 conn.Open(); 48 using (SqlCommand cmd = conn.CreateCommand()) 49 { 50 cmd.CommandText = sql; 51 cmd.Parameters.AddRange(parameters); 52 53 SqlDataAdapter adapter = new SqlDataAdapter(cmd); 54 DataSet dataset=new DataSet(); 55 adapter.Fill(dataset); 56 return dataset.Tables[0]; 57 } 58 } 59 } 60 } 61 } View Code?
(三)ADO.Net案例：登陸、數(shù)據(jù)導(dǎo)入導(dǎo)出、省市聯(lián)動(dòng)選擇
1 <?xml version="1.0" encoding="utf-8" ?> 2 <configuration> 3 <connectionStrings> 4 <add name="dbConnStr" connectionString="data source=.;initial catalog=Scott;user id=sa;password=222222"/> 5 </connectionStrings> 6 </configuration> View Code?
1 <?xml version="1.0" encoding="utf-8" ?> 2 <configuration> 3 <connectionStrings> 4 <add name="myconnStr" connectionString ="data source=.;initial catalog=Scott;user id=sa;password=222222"/> 5 </connectionStrings> 6 </configuration> View Code 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace Adonet 7 { 8 class Area 9 { 10 public int AreaId 11 { get; set; } 12 public string AreaName 13 { get; set; } 14 } 15 } View Code 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 Adonet 12 { 13 public partial class LoginWindow : Form 14 { 15 public LoginWindow() 16 { 17 InitializeComponent(); 18 } 19 20 private void btnLogin_Click(object sender, EventArgs e) 21 { 22 if (userName.Text.Length <= 0) 23 { 24 MessageBox.Show("請(qǐng)輸入用戶名"); 25 return; 26 } 27 if (passWord.Text.Length <= 0) 28 { 29 MessageBox.Show("請(qǐng)輸入密碼"); 30 return; 31 } 32 33 DataTable table = SqlHelper.ExecuteDataTable("select * from T_User where username=@username;", 34 new SqlParameter("@username", userName.Text)); 35 if (table.Rows.Count <= 0) 36 { 37 MessageBox.Show("用戶名不存在"); 38 return; 39 } 40 if (table.Rows.Count > 1) 41 { 42 MessageBox.Show("不好啦，用戶名重復(fù)"); 43 return; 44 } 45 DataRow row = table.Rows[0]; 46 string dbPassword = (string)row["Password"]; 47 long id = (long)row["Id"]; 48 int errorTimes = (int)row["ErrorTimes"]; 49 if (errorTimes >= 3) 50 { 51 MessageBox.Show("輸入次數(shù)過(guò)多，用戶已經(jīng)鎖定"); 52 return; 53 } 54 if (passWord.Text != dbPassword) 55 { 56 SqlHelper.ExecuteNonQuery("update T_User set ErrorTimes=ErrorTimes+1 where Id=@Id", 57 new SqlParameter("@Id", id)); 58 MessageBox.Show("密碼錯(cuò)誤"); 59 } 60 else 61 { 62 MessageBox.Show("登陸成功"); 63 } 64 } 65 } 66 } View Code 1 namespace Adonet 2 { 3 partial class LoginWindow 4 { 5 /// <summary> 6 /// 必需的設(shè)計(jì)器變量。 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// 清理所有正在使用的資源。 12 /// </summary> 13 /// <param name="disposing">如果應(yīng)釋放托管資源，為 true；否則為 false。</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows 窗體設(shè)計(jì)器生成的代碼 24 25 /// <summary> 26 /// 設(shè)計(jì)器支持所需的方法 - 不要 27 /// 使用代碼編輯器修改此方法的內(nèi)容。 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.userName = new System.Windows.Forms.TextBox(); 32 this.label1 = new System.Windows.Forms.Label(); 33 this.label2 = new System.Windows.Forms.Label(); 34 this.passWord = new System.Windows.Forms.TextBox(); 35 this.btnLogin = new System.Windows.Forms.Button(); 36 this.SuspendLayout(); 37 // 38 // userName 39 // 40 this.userName.Location = new System.Drawing.Point(135, 34); 41 this.userName.Name = "userName"; 42 this.userName.Size = new System.Drawing.Size(100, 21); 43 this.userName.TabIndex = 0; 44 // 45 // label1 46 // 47 this.label1.AutoSize = true; 48 this.label1.Location = new System.Drawing.Point(46, 37); 49 this.label1.Name = "label1"; 50 this.label1.Size = new System.Drawing.Size(41, 12); 51 this.label1.TabIndex = 1; 52 this.label1.Text = "用戶名"; 53 // 54 // label2 55 // 56 this.label2.AutoSize = true; 57 this.label2.Location = new System.Drawing.Point(58, 104); 58 this.label2.Name = "label2"; 59 this.label2.Size = new System.Drawing.Size(29, 12); 60 this.label2.TabIndex = 2; 61 this.label2.Text = "密碼"; 62 // 63 // passWord 64 // 65 this.passWord.Location = new System.Drawing.Point(135, 101); 66 this.passWord.Name = "passWord"; 67 this.passWord.Size = new System.Drawing.Size(100, 21); 68 this.passWord.TabIndex = 3; 69 // 70 // btnLogin 71 // 72 this.btnLogin.Location = new System.Drawing.Point(88, 161); 73 this.btnLogin.Name = "btnLogin"; 74 this.btnLogin.Size = new System.Drawing.Size(75, 23); 75 this.btnLogin.TabIndex = 4; 76 this.btnLogin.Text = "登錄"; 77 this.btnLogin.UseVisualStyleBackColor = true; 78 this.btnLogin.Click += new System.EventHandler(this.btnLogin_Click); 79 // 80 // LoginWindow 81 // 82 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 83 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 84 this.ClientSize = new System.Drawing.Size(284, 261); 85 this.Controls.Add(this.btnLogin); 86 this.Controls.Add(this.passWord); 87 this.Controls.Add(this.label2); 88 this.Controls.Add(this.label1); 89 this.Controls.Add(this.userName); 90 this.Name = "LoginWindow"; 91 this.Text = "LoginWindow"; 92 this.ResumeLayout(false); 93 this.PerformLayout(); 94 95 } 96 97 #endregion 98 99 private System.Windows.Forms.TextBox userName; 100 private System.Windows.Forms.Label label1; 101 private System.Windows.Forms.Label label2; 102 private System.Windows.Forms.TextBox passWord; 103 private System.Windows.Forms.Button btnLogin; 104 } 105 } View Code 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 Adonet 12 { 13 public partial class CitySelectWindow : Form 14 { 15 public CitySelectWindow() 16 { 17 InitializeComponent(); 18 } 19 20 Dictionary<string, int> dictProv = new Dictionary<string, int>(); 21 private void CitySelectWindow_Load(object sender, EventArgs e) 22 { 23 DataTable dtProv = SqlHelper.ExecuteDataTable("select * from AreaFull where AreaPid=0"); 24 //List<Area> listProv = new List<Area>(); 25 //Area area = new Area(); 26 foreach (DataRow row in dtProv.Rows) 27 { 28 //area.AreaId = (int)row["AreaId"]; 29 //area.AreaName = (string)row["AreaName"]; 30 //listProv.Add(area); 31 dictProv.Add((string)row["AreaName"], (int)row["AreaId"]); 32 lbProv.Items.Add((string)row["AreaName"]); 33 } 34 } 35 36 private void lbProv_SelectedIndexChanged(object sender, EventArgs e) 37 { 38 lbCity.Items.Clear(); 39 string areaName = (string)lbProv.SelectedItem; 40 int areaId = dictProv[areaName]; 41 DataTable dtCity = SqlHelper.ExecuteDataTable("select * from AreaFull where AreaPid=@AreaPid", 42 new SqlParameter("@AreaPid", areaId)); 43 foreach (DataRow row in dtCity.Rows) 44 { 45 lbCity.Items.Add((string)row["AreaName"]); 46 } 47 //MessageBox.Show(id.ToString()); 48 } 49 } 50 } View Code 1 namespace Adonet 2 { 3 partial class CitySelectWindow 4 { 5 /// <summary> 6 /// Required designer variable. 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// Clean up any resources being used. 12 /// </summary> 13 /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows Form Designer generated code 24 25 /// <summary> 26 /// Required method for Designer support - do not modify 27 /// the contents of this method with the code editor. 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.lbProv = new System.Windows.Forms.ListBox(); 32 this.lbCity = new System.Windows.Forms.ListBox(); 33 this.lbXian = new System.Windows.Forms.ListBox(); 34 this.SuspendLayout(); 35 // 36 // lbProv 37 // 38 this.lbProv.FormattingEnabled = true; 39 this.lbProv.ItemHeight = 12; 40 this.lbProv.Location = new System.Drawing.Point(12, 12); 41 this.lbProv.Name = "lbProv"; 42 this.lbProv.Size = new System.Drawing.Size(120, 340); 43 this.lbProv.TabIndex = 0; 44 this.lbProv.SelectedIndexChanged += new System.EventHandler(this.lbProv_SelectedIndexChanged); 45 // 46 // lbCity 47 // 48 this.lbCity.FormattingEnabled = true; 49 this.lbCity.ItemHeight = 12; 50 this.lbCity.Location = new System.Drawing.Point(138, 12); 51 this.lbCity.Name = "lbCity"; 52 this.lbCity.Size = new System.Drawing.Size(120, 340); 53 this.lbCity.TabIndex = 1; 54 // 55 // lbXian 56 // 57 this.lbXian.FormattingEnabled = true; 58 this.lbXian.ItemHeight = 12; 59 this.lbXian.Location = new System.Drawing.Point(264, 12); 60 this.lbXian.Name = "lbXian"; 61 this.lbXian.Size = new System.Drawing.Size(120, 340); 62 this.lbXian.TabIndex = 2; 63 // 64 // CitySelectWindow 65 // 66 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 67 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 68 this.ClientSize = new System.Drawing.Size(795, 367); 69 this.Controls.Add(this.lbXian); 70 this.Controls.Add(this.lbCity); 71 this.Controls.Add(this.lbProv); 72 this.Name = "CitySelectWindow"; 73 this.Text = "CitySelectWindow"; 74 this.Load += new System.EventHandler(this.CitySelectWindow_Load); 75 this.ResumeLayout(false); 76 77 } 78 79 #endregion 80 81 private System.Windows.Forms.ListBox lbProv; 82 private System.Windows.Forms.ListBox lbCity; 83 private System.Windows.Forms.ListBox lbXian; 84 } 85 } View Code 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.IO; 10 using System.Data.SqlClient; 11 12 namespace Adonet 13 { 14 public partial class CustomerImportExportWindow : Form 15 { 16 public CustomerImportExportWindow() 17 { 18 InitializeComponent(); 19 } 20 21 private void btnImport_Click(object sender, EventArgs e) 22 { 23 List<string> list=new List<string>(); 24 OpenFileDialog ofd = new OpenFileDialog(); 25 ofd.Filter = "所有文件|*.txt"; 26 ofd.ShowDialog(); 27 string filename = ofd.FileName; 28 using (StreamReader sr=new StreamReader(filename,Encoding.Default)) 29 { 30 while (!sr.EndOfStream) 31 { 32 list.Add(sr.ReadLine()); 33 } 34 //string[] strs = File.ReadAllLines(filename, Encoding.Default); 35 string[] strs = File.ReadLines(filename, Encoding.Default).ToArray(); 36 foreach (string str in strs) 37 { 38 string[] segs = str.Split(new char[] { '\t' }, StringSplitOptions.RemoveEmptyEntries); 39 string name = segs[0]; 40 string age = segs[1]; 41 SqlHelper.ExecuteNonQuery("insert into T_Customer(Name,Age) values(@Name,@Age)", 42 new SqlParameter("@Name", name), 43 new SqlParameter("Age", Convert.ToInt32(age))); 44 } 45 MessageBox.Show("導(dǎo)入成功！成功導(dǎo)入" + strs.Length + "條數(shù)據(jù)！"); 46 //foreach (string line in list) 47 //{ 48 // string[] segs = line.Split(new char[] { '\t' }, StringSplitOptions.RemoveEmptyEntries); 49 // string name = segs[0]; 50 // string age = segs[1]; 51 // SqlHelper.ExecuteNonQuery("Insert into T_Customer(Name,Age) values(@Name,@Age)", 52 // new SqlParameter("@Name", name), 53 // new SqlParameter("@Age", Convert.ToInt32(age))); 54 //} 55 //MessageBox.Show("導(dǎo)入成功！成功導(dǎo)入" + list.Count + "條數(shù)據(jù)！"); 56 } 57 } 58 } 59 } View Code 1 namespace Adonet 2 { 3 partial class CustomerImportExportWindow 4 { 5 /// <summary> 6 /// Required designer variable. 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// Clean up any resources being used. 12 /// </summary> 13 /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows Form Designer generated code 24 25 /// <summary> 26 /// Required method for Designer support - do not modify 27 /// the contents of this method with the code editor. 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.btnImport = new System.Windows.Forms.Button(); 32 this.SuspendLayout(); 33 // 34 // btnImport 35 // 36 this.btnImport.Location = new System.Drawing.Point(98, 95); 37 this.btnImport.Name = "btnImport"; 38 this.btnImport.Size = new System.Drawing.Size(75, 23); 39 this.btnImport.TabIndex = 0; 40 this.btnImport.Text = "導(dǎo)入"; 41 this.btnImport.UseVisualStyleBackColor = true; 42 this.btnImport.Click += new System.EventHandler(this.btnImport_Click); 43 // 44 // CustomerImportExportWindow 45 // 46 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 47 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 48 this.ClientSize = new System.Drawing.Size(284, 261); 49 this.Controls.Add(this.btnImport); 50 this.Name = "CustomerImportExportWindow"; 51 this.Text = "CustomerImportExportWindow"; 52 this.ResumeLayout(false); 53 54 } 55 56 #endregion 57 58 private System.Windows.Forms.Button btnImport; 59 } 60 } View Code 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Windows.Forms; 5 6 namespace Adonet 7 { 8 static class Program 9 { 10 /// <summary> 11 /// 應(yīng)用程序的主入口點(diǎn)。 12 /// </summary> 13 [STAThread] 14 static void Main() 15 { 16 Application.EnableVisualStyles(); 17 Application.SetCompatibleTextRenderingDefault(false); 18 Application.Run(new CitySelectWindow()); 19 } 20 } 21 } View Codesqlhelper
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Configuration; 6 using System.Data.SqlClient; 7 using System.Data; 8 9 namespace Adonet 10 { 11 static class SqlHelper 12 { 13 private static string connStr = ConfigurationManager.ConnectionStrings["myconnStr"].ConnectionString; 14 15 public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters) 16 { 17 using (SqlConnection conn = new SqlConnection(connStr)) 18 { 19 conn.Open(); 20 using (SqlCommand cmd = conn.CreateCommand()) 21 { 22 cmd.CommandText = sql; 23 cmd.Parameters.AddRange(parameters); 24 return cmd.ExecuteNonQuery(); 25 } 26 } 27 } 28 29 public static object ExecuteScalar(string sql, params SqlParameter[] parameters) 30 { 31 using (SqlConnection conn = new SqlConnection(connStr)) 32 { 33 conn.Open(); 34 using (SqlCommand cmd = conn.CreateCommand()) 35 { 36 cmd.CommandText = sql; 37 cmd.Parameters.AddRange(parameters); 38 return cmd.ExecuteScalar(); 39 } 40 } 41 } 42 43 public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parameters) 44 { 45 using (SqlConnection conn = new SqlConnection(connStr)) 46 { 47 conn.Open(); 48 using (SqlCommand cmd = conn.CreateCommand()) 49 { 50 cmd.CommandText = sql; 51 cmd.Parameters.AddRange(parameters); 52 DataSet dataSet = new DataSet(); 53 SqlDataAdapter adapter = new SqlDataAdapter(cmd); 54 adapter.Fill(dataSet); 55 return dataSet.Tables[0]; 56 } 57 } 58 } 59 } 60 } View Code?
(四)ADO.Net案例：手機(jī)號(hào)碼歸屬地查詢、DbValue.Null的處理、三層架構(gòu)
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(五)典型的ListUI+EditUI、人事管理系統(tǒng)需求分析、架構(gòu)設(shè)計(jì)、MD5算法、程序登錄
DAL：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using Customer.Model; 6 using System.Data; 7 using System.Data.SqlClient; 8 9 namespace Customer.DAL 10 { 11 public static class CustomerDAL 12 { 13 public static CustomerModel ToCustomer(DataRow row) 14 { 15 CustomerModel cust = new CustomerModel(); 16 cust.Id = (long)row["Id"]; 17 cust.Name = (string)row["Name"]; 18 cust.Birthday = (DateTime?)SqlHelper.FromDBValue(row["Birthday"]); 19 cust.Address = (string)row["Address"]; 20 cust.TelNum = (string)row["TelNum"]; 21 cust.CustLevel = (int)row["CustLevel"]; 22 return cust; 23 } 24 25 public static CustomerModel GetById(long id) 26 { 27 DataTable table = SqlHelper.ExecuteDataTable("select * from T_Customer where Id=@Id", 28 new SqlParameter("@Id", id)); 29 if (table.Rows.Count <= 0) 30 { 31 return null; 32 } 33 else if (table.Rows.Count > 1) 34 { 35 throw new Exception("嚴(yán)重錯(cuò)誤，查出多條數(shù)據(jù)！"); 36 } 37 else 38 { 39 return ToCustomer(table.Rows[0]); 40 } 41 } 42 43 public static CustomerModel[] GetAll() 44 { 45 46 DataTable table = SqlHelper.ExecuteDataTable("select * from T_Customer"); 47 CustomerModel[] customers=new CustomerModel[table.Rows.Count]; 48 for (int i = 0; i < table.Rows.Count; i++) 49 { 50 customers[i] = ToCustomer(table.Rows[i]); 51 } 52 return customers; 53 } 54 55 public static void DeleteById(long id) 56 { 57 SqlHelper.ExecuteNonQuery("delete from T_Customer where Id=@Id", 58 new SqlParameter("@Id", id)); 59 } 60 61 public static void Insert(CustomerModel cust) 62 { 63 SqlHelper.ExecuteNonQuery(@"insert into T_Customer (Name,Birthday,Address,TelNum,CustLevel) 64 values(@Name,@Birthday,@Address,@TelNum,@CustLevel)", 65 new SqlParameter("@Name", cust.Name), 66 new SqlParameter("@Birthday", cust.Birthday), 67 new SqlParameter("@Address", cust.Address), 68 new SqlParameter("@TelNum", cust.TelNum), 69 new SqlParameter("@CustLevel", cust.CustLevel)); 70 } 71 72 public static void Update(CustomerModel cust) 73 { 74 SqlHelper.ExecuteNonQuery(@"update T_Customer 75 set Name=@Name,Birthday=@Birthday,Address=@Address,TelNum=@TelNum,CustLevel=@CustLevel 76 where Id=@Id", 77 new SqlParameter("@Name", cust.Name), 78 new SqlParameter("@Birthday", cust.Birthday), 79 new SqlParameter("@Address", cust.Address), 80 new SqlParameter("@TelNum", cust.TelNum), 81 new SqlParameter("@CustLevel", cust.CustLevel), 82 new SqlParameter("@Id", cust.Id)); 83 } 84 } 85 } View Code 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Configuration; 6 using System.Data.SqlClient; 7 using System.Data; 8 9 namespace Customer.DAL 10 { 11 class SqlHelper 12 { 13 public static string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString; 14 15 public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters) 16 { 17 using (SqlConnection conn = new SqlConnection(connStr)) 18 { 19 conn.Open(); 20 using (SqlCommand cmd = conn.CreateCommand()) 21 { 22 cmd.CommandText = sql; 23 cmd.Parameters.AddRange(parameters); 24 return cmd.ExecuteNonQuery(); 25 } 26 } 27 } 28 29 public static object ExecuteScalar(string sql, params SqlParameter[] parameters) 30 { 31 using (SqlConnection conn = new SqlConnection(connStr)) 32 { 33 conn.Open(); 34 using (SqlCommand cmd = conn.CreateCommand()) 35 { 36 cmd.CommandText = sql; 37 cmd.Parameters.AddRange(parameters); 38 return cmd.ExecuteScalar(); 39 } 40 } 41 } 42 43 public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parameters) 44 { 45 using (SqlConnection conn = new SqlConnection(connStr)) 46 { 47 conn.Open(); 48 using (SqlCommand cmd = conn.CreateCommand()) 49 { 50 cmd.CommandText = sql; 51 cmd.Parameters.AddRange(parameters); 52 DataSet dataset = new DataSet(); 53 SqlDataAdapter adapter = new SqlDataAdapter(cmd); 54 adapter.Fill(dataset); 55 return dataset.Tables[0]; 56 } 57 } 58 } 59 60 public static object FromDBValue(object value) 61 { 62 if (DBNull.Value == value) 63 { 64 return null; 65 } 66 else 67 { 68 return value; 69 } 70 } 71 72 public static object ToDBValue(object value) 73 { 74 if (null == value) 75 { 76 return DBNull.Value; 77 } 78 else 79 { 80 return value; 81 } 82 } 83 } 84 } View Codeimages:
Model:
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1 <?xml version="1.0" encoding="utf-8" ?> 2 <configuration> 3 <connectionStrings> 4 <add name="connStr" connectionString="server=.;database=Scott;uid=sa;pwd=222222"/> 5 </connectionStrings> 6 </configuration> View Code 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 Customer.Model; 10 using Customer.DAL; 11 12 namespace Customer 13 { 14 public partial class CustomerEditUI : Form 15 { 16 public CustomerEditUI() 17 { 18 InitializeComponent(); 19 } 20 21 public bool isInsert { get; set; } 22 public long EditingId { get; set; } 23 24 private void btnSave_Click(object sender, EventArgs e) 25 { 26 CustomerModel cust = new CustomerModel(); 27 cust.Name = txtName.Text; 28 cust.Birthday = dtBirthday.Value; 29 cust.TelNum = txtTelNum.Text; 30 cust.CustLevel = int.Parse(txtCustLevel.Text); 31 cust.Address = txtAddress.Text; 32 if (isInsert) 33 { 34 CustomerDAL.Insert(cust); 35 } 36 else 37 { 38 cust.Id=EditingId; 39 CustomerDAL.Update(cust); 40 } 41 DialogResult = DialogResult.Yes; 42 } 43 44 private void btnCancel_Click(object sender, EventArgs e) 45 { 46 DialogResult = DialogResult.No; 47 } 48 49 private void CustomerEditUI_Load(object sender, EventArgs e) 50 { 51 if (isInsert) 52 { 53 txtName.Focus(); 54 txtCustLevel.Text = "2"; 55 } 56 else 57 { 58 CustomerModel cust = new CustomerModel(); 59 cust = CustomerDAL.GetById(EditingId); 60 txtName.Text = cust.Name; 61 dtBirthday.Value = (DateTime)cust.Birthday; 62 txtTelNum.Text = cust.TelNum; 63 txtCustLevel.Text = cust.CustLevel.ToString(); 64 txtAddress.Text = cust.Address; 65 } 66 } 67 } 68 } View Code 1 namespace Customer 2 { 3 partial class CustomerEditUI 4 { 5 /// <summary> 6 /// Required designer variable. 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// Clean up any resources being used. 12 /// </summary> 13 /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows Form Designer generated code 24 25 /// <summary> 26 /// Required method for Designer support - do not modify 27 /// the contents of this method with the code editor. 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.txtName = new System.Windows.Forms.TextBox(); 32 this.txtTelNum = new System.Windows.Forms.TextBox(); 33 this.txtCustLevel = new System.Windows.Forms.TextBox(); 34 this.txtAddress = new System.Windows.Forms.TextBox(); 35 this.label1 = new System.Windows.Forms.Label(); 36 this.label2 = new System.Windows.Forms.Label(); 37 this.label3 = new System.Windows.Forms.Label(); 38 this.label4 = new System.Windows.Forms.Label(); 39 this.label5 = new System.Windows.Forms.Label(); 40 this.btnSave = new System.Windows.Forms.Button(); 41 this.btnCancel = new System.Windows.Forms.Button(); 42 this.dtBirthday = new System.Windows.Forms.DateTimePicker(); 43 this.SuspendLayout(); 44 // 45 // txtName 46 // 47 this.txtName.Location = new System.Drawing.Point(146, 54); 48 this.txtName.Name = "txtName"; 49 this.txtName.Size = new System.Drawing.Size(100, 21); 50 this.txtName.TabIndex = 0; 51 // 52 // txtTelNum 53 // 54 this.txtTelNum.Location = new System.Drawing.Point(503, 57); 55 this.txtTelNum.Name = "txtTelNum"; 56 this.txtTelNum.Size = new System.Drawing.Size(100, 21); 57 this.txtTelNum.TabIndex = 1; 58 // 59 // txtCustLevel 60 // 61 this.txtCustLevel.Location = new System.Drawing.Point(503, 117); 62 this.txtCustLevel.Name = "txtCustLevel"; 63 this.txtCustLevel.Size = new System.Drawing.Size(100, 21); 64 this.txtCustLevel.TabIndex = 3; 65 // 66 // txtAddress 67 // 68 this.txtAddress.Location = new System.Drawing.Point(146, 179); 69 this.txtAddress.Name = "txtAddress"; 70 this.txtAddress.Size = new System.Drawing.Size(457, 21); 71 this.txtAddress.TabIndex = 4; 72 // 73 // label1 74 // 75 this.label1.AutoSize = true; 76 this.label1.Location = new System.Drawing.Point(77, 60); 77 this.label1.Name = "label1"; 78 this.label1.Size = new System.Drawing.Size(29, 12); 79 this.label1.TabIndex = 5; 80 this.label1.Text = "姓名"; 81 // 82 // label2 83 // 84 this.label2.AutoSize = true; 85 this.label2.Location = new System.Drawing.Point(426, 60); 86 this.label2.Name = "label2"; 87 this.label2.Size = new System.Drawing.Size(53, 12); 88 this.label2.TabIndex = 6; 89 this.label2.Text = "電話號(hào)碼"; 90 // 91 // label3 92 // 93 this.label3.AutoSize = true; 94 this.label3.Location = new System.Drawing.Point(77, 120); 95 this.label3.Name = "label3"; 96 this.label3.Size = new System.Drawing.Size(29, 12); 97 this.label3.TabIndex = 7; 98 this.label3.Text = "生日"; 99 // 100 // label4 101 // 102 this.label4.AutoSize = true; 103 this.label4.Location = new System.Drawing.Point(426, 120); 104 this.label4.Name = "label4"; 105 this.label4.Size = new System.Drawing.Size(29, 12); 106 this.label4.TabIndex = 8; 107 this.label4.Text = "級(jí)別"; 108 // 109 // label5 110 // 111 this.label5.AutoSize = true; 112 this.label5.Location = new System.Drawing.Point(77, 182); 113 this.label5.Name = "label5"; 114 this.label5.Size = new System.Drawing.Size(53, 12); 115 this.label5.TabIndex = 9; 116 this.label5.Text = "通信地址"; 117 // 118 // btnSave 119 // 120 this.btnSave.DialogResult = System.Windows.Forms.DialogResult.Yes; 121 this.btnSave.Location = new System.Drawing.Point(392, 257); 122 this.btnSave.Name = "btnSave"; 123 this.btnSave.Size = new System.Drawing.Size(75, 23); 124 this.btnSave.TabIndex = 10; 125 this.btnSave.Text = "保存"; 126 this.btnSave.UseVisualStyleBackColor = true; 127 this.btnSave.Click += new System.EventHandler(this.btnSave_Click); 128 // 129 // btnCancel 130 // 131 this.btnCancel.Location = new System.Drawing.Point(528, 257); 132 this.btnCancel.Name = "btnCancel"; 133 this.btnCancel.Size = new System.Drawing.Size(75, 23); 134 this.btnCancel.TabIndex = 11; 135 this.btnCancel.Text = "取消"; 136 this.btnCancel.UseVisualStyleBackColor = true; 137 this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click); 138 // 139 // dtBirthday 140 // 141 this.dtBirthday.Location = new System.Drawing.Point(146, 114); 142 this.dtBirthday.Name = "dtBirthday"; 143 this.dtBirthday.Size = new System.Drawing.Size(200, 21); 144 this.dtBirthday.TabIndex = 12; 145 // 146 // CustomerEditUI 147 // 148 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 149 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 150 this.ClientSize = new System.Drawing.Size(732, 348); 151 this.Controls.Add(this.dtBirthday); 152 this.Controls.Add(this.btnCancel); 153 this.Controls.Add(this.btnSave); 154 this.Controls.Add(this.label5); 155 this.Controls.Add(this.label4); 156 this.Controls.Add(this.label3); 157 this.Controls.Add(this.label2); 158 this.Controls.Add(this.label1); 159 this.Controls.Add(this.txtAddress); 160 this.Controls.Add(this.txtCustLevel); 161 this.Controls.Add(this.txtTelNum); 162 this.Controls.Add(this.txtName); 163 this.Name = "CustomerEditUI"; 164 this.Text = "CustomerEditUI"; 165 this.Load += new System.EventHandler(this.CustomerEditUI_Load); 166 this.ResumeLayout(false); 167 this.PerformLayout(); 168 169 } 170 171 #endregion 172 173 private System.Windows.Forms.TextBox txtName; 174 private System.Windows.Forms.TextBox txtTelNum; 175 private System.Windows.Forms.TextBox txtCustLevel; 176 private System.Windows.Forms.TextBox txtAddress; 177 private System.Windows.Forms.Label label1; 178 private System.Windows.Forms.Label label2; 179 private System.Windows.Forms.Label label3; 180 private System.Windows.Forms.Label label4; 181 private System.Windows.Forms.Label label5; 182 private System.Windows.Forms.Button btnSave; 183 private System.Windows.Forms.Button btnCancel; 184 private System.Windows.Forms.DateTimePicker dtBirthday; 185 } 186 } View Code 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 Customer.DAL; 10 using Customer.Model; 11 12 namespace Customer 13 { 14 public partial class CustomerListUI : Form 15 { 16 public CustomerListUI() 17 { 18 InitializeComponent(); 19 } 20 21 void LoadData() 22 { 23 dataGridView1.DataSource = CustomerDAL.GetAll(); 24 } 25 26 private void CustomerListUI_Load(object sender, EventArgs e) 27 { 28 LoadData(); 29 } 30 31 private void toolStripButton1_Click(object sender, EventArgs e) 32 { 33 CustomerEditUI editUI = new CustomerEditUI(); 34 editUI.isInsert = true; 35 editUI.ShowDialog(); 36 if (editUI.DialogResult == DialogResult.Yes) 37 { 38 LoadData(); 39 } 40 41 } 42 43 private void toolStripButton2_Click(object sender, EventArgs e) 44 { 45 if (dataGridView1.SelectedRows.Count <= 0) 46 { 47 MessageBox.Show("請(qǐng)選擇要編輯的行！"); 48 return; 49 } 50 else if(dataGridView1.SelectedRows.Count >=2) 51 { 52 MessageBox.Show("只能選擇一行！"); 53 return; 54 } 55 else 56 { 57 CustomerModel cust = (CustomerModel)dataGridView1.SelectedRows[0].DataBoundItem; 58 CustomerEditUI editUI = new CustomerEditUI(); 59 editUI.isInsert = false; 60 editUI.EditingId = cust.Id; 61 editUI.ShowDialog(); 62 if (editUI.DialogResult == DialogResult.Yes) 63 { 64 LoadData(); 65 } 66 } 67 68 } 69 70 private void toolStripButton3_Click(object sender, EventArgs e) 71 { 72 if (dataGridView1.SelectedRows.Count <= 0) 73 { 74 MessageBox.Show("請(qǐng)選擇要編輯的行！"); 75 return; 76 } 77 78 DialogResult dr = MessageBox.Show("是否確定", "詢問(wèn)", MessageBoxButtons.YesNo, MessageBoxIcon.Question); 79 if (dr == DialogResult.Yes) 80 { 81 for (int i = 0; i < dataGridView1.SelectedRows.Count; i++) 82 { 83 CustomerModel cust = (CustomerModel)dataGridView1.SelectedRows[i].DataBoundItem; 84 CustomerDAL.DeleteById(cust.Id); 85 } 86 } 87 LoadData(); 88 } 89 } 90 } View Code 1 namespace Customer 2 { 3 partial class CustomerListUI 4 { 5 /// <summary> 6 /// 必需的設(shè)計(jì)器變量。 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// 清理所有正在使用的資源。 12 /// </summary> 13 /// <param name="disposing">如果應(yīng)釋放托管資源，為 true；否則為 false。</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows 窗體設(shè)計(jì)器生成的代碼 24 25 /// <summary> 26 /// 設(shè)計(jì)器支持所需的方法 - 不要 27 /// 使用代碼編輯器修改此方法的內(nèi)容。 28 /// </summary> 29 private void InitializeComponent() 30 { 31 System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(CustomerListUI)); 32 this.toolStrip1 = new System.Windows.Forms.ToolStrip(); 33 this.toolStripButton1 = new System.Windows.Forms.ToolStripButton(); 34 this.toolStripButton2 = new System.Windows.Forms.ToolStripButton(); 35 this.toolStripButton3 = new System.Windows.Forms.ToolStripButton(); 36 this.dataGridView1 = new System.Windows.Forms.DataGridView(); 37 this.toolStrip1.SuspendLayout(); 38 ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit(); 39 this.SuspendLayout(); 40 // 41 // toolStrip1 42 // 43 this.toolStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { 44 this.toolStripButton1, 45 this.toolStripButton2, 46 this.toolStripButton3}); 47 this.toolStrip1.Location = new System.Drawing.Point(0, 0); 48 this.toolStrip1.Name = "toolStrip1"; 49 this.toolStrip1.Size = new System.Drawing.Size(1112, 25); 50 this.toolStrip1.TabIndex = 0; 51 this.toolStrip1.Text = "toolStrip1"; 52 // 53 // toolStripButton1 54 // 55 this.toolStripButton1.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image; 56 this.toolStripButton1.Image = ((System.Drawing.Image)(resources.GetObject("toolStripButton1.Image"))); 57 this.toolStripButton1.ImageTransparentColor = System.Drawing.Color.Magenta; 58 this.toolStripButton1.Name = "toolStripButton1"; 59 this.toolStripButton1.Size = new System.Drawing.Size(23, 22); 60 this.toolStripButton1.Text = "toolStripButton1"; 61 this.toolStripButton1.Click += new System.EventHandler(this.toolStripButton1_Click); 62 // 63 // toolStripButton2 64 // 65 this.toolStripButton2.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image; 66 this.toolStripButton2.Image = ((System.Drawing.Image)(resources.GetObject("toolStripButton2.Image"))); 67 this.toolStripButton2.ImageTransparentColor = System.Drawing.Color.Magenta; 68 this.toolStripButton2.Name = "toolStripButton2"; 69 this.toolStripButton2.Size = new System.Drawing.Size(23, 22); 70 this.toolStripButton2.Text = "toolStripButton2"; 71 this.toolStripButton2.Click += new System.EventHandler(this.toolStripButton2_Click); 72 // 73 // toolStripButton3 74 // 75 this.toolStripButton3.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image; 76 this.toolStripButton3.Image = ((System.Drawing.Image)(resources.GetObject("toolStripButton3.Image"))); 77 this.toolStripButton3.ImageTransparentColor = System.Drawing.Color.Magenta; 78 this.toolStripButton3.Name = "toolStripButton3"; 79 this.toolStripButton3.Size = new System.Drawing.Size(23, 22); 80 this.toolStripButton3.Text = "toolStripButton3"; 81 this.toolStripButton3.Click += new System.EventHandler(this.toolStripButton3_Click); 82 // 83 // dataGridView1 84 // 85 this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize; 86 this.dataGridView1.Location = new System.Drawing.Point(12, 28); 87 this.dataGridView1.Name = "dataGridView1"; 88 this.dataGridView1.RowTemplate.Height = 23; 89 this.dataGridView1.Size = new System.Drawing.Size(1088, 361); 90 this.dataGridView1.TabIndex = 1; 91 // 92 // CustomerListUI 93 // 94 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 95 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 96 this.ClientSize = new System.Drawing.Size(1112, 401); 97 this.Controls.Add(this.dataGridView1); 98 this.Controls.Add(this.toolStrip1); 99 this.Name = "CustomerListUI"; 100 this.Text = "CustomerListUI"; 101 this.Load += new System.EventHandler(this.CustomerListUI_Load); 102 this.toolStrip1.ResumeLayout(false); 103 this.toolStrip1.PerformLayout(); 104 ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit(); 105 this.ResumeLayout(false); 106 this.PerformLayout(); 107 108 } 109 110 #endregion 111 112 private System.Windows.Forms.ToolStrip toolStrip1; 113 private System.Windows.Forms.ToolStripButton toolStripButton1; 114 private System.Windows.Forms.ToolStripButton toolStripButton2; 115 private System.Windows.Forms.ToolStripButton toolStripButton3; 116 private System.Windows.Forms.DataGridView dataGridView1; 117 118 } 119 } View Code 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Windows.Forms; 5 6 namespace Customer 7 { 8 static class Program 9 { 10 /// <summary> 11 /// 應(yīng)用程序的主入口點(diǎn)。 12 /// </summary> 13 [STAThread] 14 static void Main() 15 { 16 Application.EnableVisualStyles(); 17 Application.SetCompatibleTextRenderingDefault(false); 18 Application.Run(new CustomerListUI()); 19 } 20 } 21 } View Code?
轉(zhuǎn)載于:https://www.cnblogs.com/liuslayer/p/4713787.html
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