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对datagridview进行增删改(B)

本文转载自  查看原文  2015-06-07 16:08  2050    自我拓展提升/ WinForn/ SQL Server 
 1 create DATABASE stu  2 ON  3 (  4    name='stu.mdf',  5    filename='F:\胡浴东\数据库\stu数据库\stu.mdf',  6    size=5,  7    filegrowth=10
 8 )  9 log ON  10 (  11   name='stu_log.ldf',  12    filename='F:\胡浴东\数据库\stu数据库\stu_log.ldf',  13    size=5,  14    filegrowth=10
 15 )  16 go  17 
 18 USE [stu]  19 GO  20 /****** Object: Table [dbo].[classinfo] Script Date: 2015/5/11 10:14:54 ******/
 21 SET ANSI_NULLS ON  22 GO  23 SET QUOTED_IDENTIFIER ON  24 GO  25 SET ANSI_PADDING ON  26 GO  27 CREATE TABLE [dbo].[classinfo](  28     [c_id] [int] IDENTITY(1,1) NOT NULL,  29     [c_dep_id] [int] NULL,  30     [c_name] [varchar](20) NULL,  31 PRIMARY KEY CLUSTERED  32 (  33  [c_id] ASC  34 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]  35 ) ON [PRIMARY]  36 
 37 GO  38 SET ANSI_PADDING OFF  39 GO  40 /****** Object: Table [dbo].[department] Script Date: 2015/5/11 10:14:54 ******/
 41 SET ANSI_NULLS ON  42 GO  43 SET QUOTED_IDENTIFIER ON  44 GO  45 SET ANSI_PADDING ON  46 GO  47 CREATE TABLE [dbo].[department](  48     [dep_id] [int] IDENTITY(1,1) NOT NULL,  49     [dep_name] [varchar](20) NULL,  50 PRIMARY KEY CLUSTERED  51 (  52  [dep_id] ASC  53 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]  54 ) ON [PRIMARY]  55 
 56 GO  57 SET ANSI_PADDING OFF  58 GO  59 /****** Object: Table [dbo].[logins] Script Date: 2015/5/11 10:14:54 ******/
 60 SET ANSI_NULLS ON  61 GO  62 SET QUOTED_IDENTIFIER ON  63 GO  64 SET ANSI_PADDING ON  65 GO  66 CREATE TABLE [dbo].[logins](  67     [l_no] [varchar](10) NOT NULL,  68     [l_pwd] [varchar](10) NOT NULL,  69     [l_question] [varchar](30) NOT NULL,  70     [l_answer] [varchar](30) NOT NULL,  71 PRIMARY KEY CLUSTERED  72 (  73  [l_no] ASC  74 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]  75 ) ON [PRIMARY]  76 
 77 GO  78 SET ANSI_PADDING OFF  79 GO  80 /****** Object: Table [dbo].[member] Script Date: 2015/5/11 10:14:54 ******/
 81 SET ANSI_NULLS ON  82 GO  83 SET QUOTED_IDENTIFIER ON  84 GO  85 SET ANSI_PADDING ON  86 GO  87 CREATE TABLE [dbo].[member](  88     [username] [varchar](20) NOT NULL,  89     [pwd] [varchar](6) NOT NULL,  90     [name] [varchar](20) NULL,  91     [gender] [char](2) NULL,  92     [age] [varchar](10) NULL,  93     [enjoy] [varchar](50) NULL,  94 PRIMARY KEY CLUSTERED  95 (  96  [username] ASC  97 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]  98 ) ON [PRIMARY]  99 
100 GO 101 SET ANSI_PADDING OFF 102 GO 103 /****** Object: Table [dbo].[result] Script Date: 2015/5/11 10:14:54 ******/
104 SET ANSI_NULLS ON 105 GO 106 SET QUOTED_IDENTIFIER ON 107 GO 108 CREATE TABLE [dbo].[result]( 109     [r_id] [int] IDENTITY(1,1) NOT NULL, 110     [r_sub_id] [int] NULL, 111     [r_stu_id] [int] NULL, 112     [r_result] [int] NULL, 113 PRIMARY KEY CLUSTERED 114 ( 115  [r_id] ASC 116 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 117 ) ON [PRIMARY] 118 
119 GO 120 /****** Object: Table [dbo].[studentinfo] Script Date: 2015/5/11 10:14:54 ******/
121 SET ANSI_NULLS ON 122 GO 123 SET QUOTED_IDENTIFIER ON 124 GO 125 SET ANSI_PADDING ON 126 GO 127 CREATE TABLE [dbo].[studentinfo]( 128     [stu_id] [int] IDENTITY(1,1) NOT NULL, 129     [stu_name] [varchar](20) NOT NULL, 130     [stu_age] [int] NULL, 131     [stu_c_id] [int] NULL, 132     [stu_gender] [char](2) NULL, 133     [stu_address] [varchar](30) NULL, 134 PRIMARY KEY CLUSTERED 135 ( 136  [stu_id] ASC 137 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 138 ) ON [PRIMARY] 139 
140 GO 141 SET ANSI_PADDING OFF 142 GO 143 /****** Object: Table [dbo].[subject] Script Date: 2015/5/11 10:14:54 ******/
144 SET ANSI_NULLS ON 145 GO 146 SET QUOTED_IDENTIFIER ON 147 GO 148 SET ANSI_PADDING ON 149 GO 150 CREATE TABLE [dbo].[subject]( 151     [sub_id] [int] IDENTITY(1,1) NOT NULL, 152     [sub_name] [varchar](20) NULL, 153 PRIMARY KEY CLUSTERED 154 ( 155  [sub_id] ASC 156 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 157 ) ON [PRIMARY] 158 
159 GO 160 SET ANSI_PADDING OFF 161 GO 162 /****** Object: View [dbo].[v_cool] Script Date: 2015/5/11 10:14:54 ******/
163 SET ANSI_NULLS ON 164 GO 165 SET QUOTED_IDENTIFIER ON 166 GO 167 create view [dbo].[v_cool] 168 as
169 select s.stu_id,d.dep_name,c.c_name,s.stu_name, 170 s.stu_age,s.stu_gender,s.stu_address 171   from studentinfo s,classinfo c,department d 172 where s.stu_c_id=c.c_id and c.c_dep_id=d.dep_id 173 GO 174 /****** Object: View [dbo].[v_ggg] Script Date: 2015/5/11 10:14:54 ******/
175 SET ANSI_NULLS ON 176 GO 177 SET QUOTED_IDENTIFIER ON 178 GO 179 create view [dbo].[v_ggg] 180 as
181 select s.stu_id 学员编号,s.stu_name 学员姓名, 182 s.stu_age 年龄,c.c_name 班级,s.stu_gender 性别, 183 s.stu_address 住址 184      from studentinfo s,classinfo c 185 where s.stu_c_id=c.c_id 186 GO 187 /****** Object: View [dbo].[View_cc] Script Date: 2015/5/11 10:14:54 ******/
188 SET ANSI_NULLS ON 189 GO 190 SET QUOTED_IDENTIFIER ON 191 GO 192 CREATE VIEW [dbo].[View_cc] 193 AS 194 SELECT dbo.classinfo.c_name, dbo.department.dep_name, dbo.studentinfo.stu_age, dbo.studentinfo.stu_name, 195  dbo.studentinfo.stu_gender, dbo.studentinfo.stu_address 196 FROM dbo.classinfo INNER JOIN 197                 dbo.department ON dbo.classinfo.c_dep_id = dbo.department.dep_id INNER JOIN 198                 dbo.studentinfo ON dbo.classinfo.c_id = dbo.studentinfo.stu_c_id 199 
200 GO 201 SET IDENTITY_INSERT [dbo].[classinfo] ON 202 
203 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (1, 1, N'2014579') 204 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (2, 2, N'2014789') 205 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (3, 3, N'2014272') 206 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (4, 3, N'2014274') 207 SET IDENTITY_INSERT [dbo].[classinfo] OFF 208 SET IDENTITY_INSERT [dbo].[department] ON 209 
210 INSERT [dbo].[department] ([dep_id], [dep_name]) VALUES (1, N'环化系') 211 INSERT [dbo].[department] ([dep_id], [dep_name]) VALUES (2, N'汽车系') 212 INSERT [dbo].[department] ([dep_id], [dep_name]) VALUES (3, N'信息智能系') 213 SET IDENTITY_INSERT [dbo].[department] OFF 214 INSERT [dbo].[logins] ([l_no], [l_pwd], [l_question], [l_answer]) VALUES (N'cool', N'123', N'111', N'222') 215 INSERT [dbo].[logins] ([l_no], [l_pwd], [l_question], [l_answer]) VALUES (N'jack', N'123', N'111', N'111') 216 INSERT [dbo].[logins] ([l_no], [l_pwd], [l_question], [l_answer]) VALUES (N'徐凯伦', N'123', N'124', N'456') 217 INSERT [dbo].[member] ([username], [pwd], [name], [gender], [age], [enjoy]) VALUES (N'tom', N'123', N'ss', N'男', N'90后', N'美女 帅哥 ') 218 INSERT [dbo].[member] ([username], [pwd], [name], [gender], [age], [enjoy]) VALUES (N'tom1', N'123', N'ss', N'男', N'90后', N'美女 帅哥 ') 219 SET IDENTITY_INSERT [dbo].[result] ON 220 
221 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (1, 1, 1, 88) 222 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (2, 1, 2, 91) 223 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (3, 1, 3, 90) 224 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (4, 1, 6, 87) 225 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (5, 2, 1, 90) 226 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (6, 2, 2, 88) 227 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (7, 2, 3, 92) 228 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (8, 2, 6, 92) 229 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (9, 3, 1, 89) 230 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (10, 3, 2, 92) 231 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (11, 3, 3, 94) 232 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (12, 3, 6, 95) 233 SET IDENTITY_INSERT [dbo].[result] OFF 234 SET IDENTITY_INSERT [dbo].[studentinfo] ON 235 
236 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (1, N'浩然刘', 25, 3, N'男', N'湖北宜昌') 237 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (2, N'柯梦', 20, 4, N'女', N'湖北十堰') 238 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (3, N'林智健', 22, 3, N'男', N'湖北天门') 239 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (4, N'刘畅', 19, 1, N'男', N'湖北十堰') 240 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (6, N'齐白石', 20, 4, N'男', N'湖北襄樊') 241 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (7, N'刘佳', 22, 4, N'男', N'湖北十堰') 242 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (9, N'张馨文', 19, 3, N'男', N'甘肃') 243 SET IDENTITY_INSERT [dbo].[studentinfo] OFF 244 SET IDENTITY_INSERT [dbo].[subject] ON 245 
246 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (1, N'C#') 247 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (2, N'html') 248 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (3, N'sqlserver') 249 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (4, N'环境监测') 250 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (5, N'汽车维修') 251 SET IDENTITY_INSERT [dbo].[subject] OFF 252 SET ANSI_PADDING ON 253 
254 GO 255 /****** Object: Index [UQ__classinf__29397C81D09B43E9] Script Date: 2015/5/11 10:14:54 ******/
256 ALTER TABLE [dbo].[classinfo] ADD UNIQUE NONCLUSTERED 257 ( 258  [c_name] ASC 259 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 260 GO 261 SET ANSI_PADDING ON 262 
263 GO 264 /****** Object: Index [UQ__departme__7BE54950D8CB39D9] Script Date: 2015/5/11 10:14:54 ******/
265 ALTER TABLE [dbo].[department] ADD UNIQUE NONCLUSTERED 266 ( 267  [dep_name] ASC 268 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 269 GO 270 SET ANSI_PADDING ON 271 
272 GO 273 /****** Object: Index [UQ__subject__99BD2209CE37D31B] Script Date: 2015/5/11 10:14:54 ******/
274 ALTER TABLE [dbo].[subject] ADD UNIQUE NONCLUSTERED 275 ( 276  [sub_name] ASC 277 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 278 GO 279 ALTER TABLE [dbo].[studentinfo] ADD  DEFAULT ('湖北十堰') FOR [stu_address] 280 GO 281 ALTER TABLE [dbo].[classinfo] WITH CHECK ADD FOREIGN KEY([c_dep_id]) 282 REFERENCES [dbo].[department] ([dep_id]) 283 GO 284 ALTER TABLE [dbo].[result] WITH CHECK ADD FOREIGN KEY([r_stu_id]) 285 REFERENCES [dbo].[studentinfo] ([stu_id]) 286 GO 287 ALTER TABLE [dbo].[result] WITH CHECK ADD FOREIGN KEY([r_sub_id]) 288 REFERENCES [dbo].[subject] ([sub_id]) 289 GO 290 ALTER TABLE [dbo].[studentinfo] WITH CHECK ADD FOREIGN KEY([stu_c_id]) 291 REFERENCES [dbo].[classinfo] ([c_id]) 292 GO 293 ALTER TABLE [dbo].[member]  WITH CHECK ADD CHECK  (([gender]='女' OR [gender]='男')) 294 GO 295 ALTER TABLE [dbo].[studentinfo]  WITH CHECK ADD CHECK  (([stu_age]>=(18) AND [stu_age]<=(30))) 296 GO 297 ALTER TABLE [dbo].[studentinfo]  WITH CHECK ADD CHECK  (([stu_gender]='女' OR [stu_gender]='男')) 298 GO 299 EXEC sys.sp_addextendedproperty @name=N'MS_DiagramPane1', @value=N'[0E232FF0-B466-11cf-A24F-00AA00A3EFFF, 1.00]
300 Begin DesignProperties = 
301    Begin PaneConfigurations = 
302       Begin PaneConfiguration = 0
303          NumPanes = 4
304          Configuration = "(H (1[11] 4[56] 2[16] 3) )"
305  End 306       Begin PaneConfiguration = 1
307          NumPanes = 3
308          Configuration = "(H (1 [50] 4 [25] 3))"
309  End 310       Begin PaneConfiguration = 2
311          NumPanes = 3
312          Configuration = "(H (1 [50] 2 [25] 3))"
313  End 314       Begin PaneConfiguration = 3
315          NumPanes = 3
316          Configuration = "(H (4 [30] 2 [40] 3))"
317  End 318       Begin PaneConfiguration = 4
319          NumPanes = 2
320          Configuration = "(H (1 [56] 3))"
321  End 322       Begin PaneConfiguration = 5
323          NumPanes = 2
324          Configuration = "(H (2 [66] 3))"
325  End 326       Begin PaneConfiguration = 6
327          NumPanes = 2
328          Configuration = "(H (4 [50] 3))"
329  End 330       Begin PaneConfiguration = 7
331          NumPanes = 1
332          Configuration = "(V (3))"
333  End 334       Begin PaneConfiguration = 8
335          NumPanes = 3
336          Configuration = "(H (1[56] 4[18] 2) )"
337  End 338       Begin PaneConfiguration = 9
339          NumPanes = 2
340          Configuration = "(H (1 [75] 4))"
341  End 342       Begin PaneConfiguration = 10
343          NumPanes = 2
344          Configuration = "(H (1[66] 2) )"
345  End 346       Begin PaneConfiguration = 11
347          NumPanes = 2
348          Configuration = "(H (4 [60] 2))"
349  End 350       Begin PaneConfiguration = 12
351          NumPanes = 1
352          Configuration = "(H (1) )"
353  End 354       Begin PaneConfiguration = 13
355          NumPanes = 1
356          Configuration = "(V (4))"
357  End 358       Begin PaneConfiguration = 14
359          NumPanes = 1
360          Configuration = "(V (2))"
361  End 362       ActivePaneConfig = 0
363  End 364    Begin DiagramPane = 
365       Begin Origin = 
366          Top = -96
367          Left = 0
368  End 369       Begin Tables = 
370          Begin Table = "classinfo"
371             Begin Extent = 
372                Top = 6
373                Left = 38
374                Bottom = 126
375                Right = 180
376  End 377             DisplayFlags = 280
378             TopColumn = 0
379  End 380          Begin Table = "department"
381             Begin Extent = 
382                Top = 6
383                Left = 218
384                Bottom = 107
385                Right = 367
386  End 387             DisplayFlags = 280
388             TopColumn = 0
389  End 390          Begin Table = "studentinfo"
391             Begin Extent = 
392                Top = 108
393                Left = 218
394                Bottom = 247
395                Right = 376
396  End 397             DisplayFlags = 280
398             TopColumn = 2
399  End 400  End 401  End 402    Begin SQLPane = 
403  End 404    Begin DataPane = 
405       Begin ParameterDefaults = ""
406  End 407  End 408    Begin CriteriaPane = 
409       Begin ColumnWidths = 11
410          Column = 1440
411          Alias = 900
412          Table = 1170
413          Output = 720
414          Append = 1400
415          NewValue = 1170
416          SortType = 1350
417          SortOrder = 1410
418          GroupBy = 1350
419          Filter = 1350
420          Or = 1350
421          Or = 1350
422          Or = 1350
423  End 424  End 425 End 426 ' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'VIEW',@level1name=N'View_cc' 427 GO 428 EXEC sys.sp_addextendedproperty @name=N'MS_DiagramPaneCount', @value=1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'VIEW',@level1name=N'View_cc'
429 GO
数据库

 在找工作的过程中，datagridview大多是这样使用的，运行效果如下：

 

 1 using System;  2 using System.Collections.Generic;  3 using System.Linq;  4 using System.Text;  5 using System.Threading.Tasks;  6 using System.Data;  7 using System.Data.SqlClient;  8 
 9 namespace Phone 10 { 11     class DBHelper 12  { 13         public static readonly string Constring = "Data Source=.;Initial Catalog=Phone;Integrated Security=True";//连接数据库
14         public static SqlConnection con = new SqlConnection(Constring); 15 
16         //打开数据库
17         public static void ConOpen() 18  { 19             if (con.State==ConnectionState.Closed) 20  { 21  con.Open(); 22  } 23  } 24 
25         //关闭数据库
26         public static void ConClose() 27  { 28             if (con.State != ConnectionState.Closed) 29  { 30  con.Close(); 31  } 32  } 33 
34         //查询有三种方法 35         //方法一
36         public static DataTable getTable(string sql) 37  { 38  ConOpen(); 39             SqlDataAdapter apt = new SqlDataAdapter(sql, con); 40             DataTable dt = new DataTable(); 41  apt.Fill(dt); 42             return dt; 43  } 44 
45         //方法二
46         public static SqlDataReader getReader(string sql) 47  { 48  ConOpen(); 49             SqlCommand cmd = new SqlCommand(sql,con); 50             SqlDataReader reader = cmd.ExecuteReader(); 51             return reader; 52  } 53 
54         //方法三
55         public static Object Scalar(string sql) 56  { 57  ConOpen(); 58             SqlCommand cmd = new SqlCommand(sql,con); 59             object obj = cmd.ExecuteScalar(); 60  ConClose(); 61             return obj; 62  } 63 
64         //增加删除修改
65         public static int ExecuteNonQuery(string sql) 66  { 67             int rult=0; 68             try
69  { 70  ConOpen(); 71                 SqlCommand cmd = new SqlCommand(sql, con); 72                 rult = cmd.ExecuteNonQuery(); 73  } 74             catch (Exception) 75  { 76  ; 77  } 78             finally 
79  { 80  ConClose(); 81  } 82             return rult; 83  } 84  } 85 }
DBHelper
  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.Threading.Tasks;
  9. using System.Windows.Forms;
  11. namespace stu
  12. {
  13.     public partial class stu : Form
  14.     {
  15.         public stu()
  16.         {
  17.             InitializeComponent();
  18.         }
  19.         //返回
  20.         private void btn_esc_Click(object sender, EventArgs e)
  21.         {
  22.             Bind(string.Empty,string.Empty);
  23.         }
  25.         //绑定、查找
  26.         public void Bind(string cbo, string txt)
  27.         {
  28.             this.cbo_search.SelectedIndex = 0;
  29.             string sql = string.Format("select stu_id 编号, stu_name 姓名,c_name 班级, stu_age 年龄, stu_gender 性别, stu_address 地址 from studentinfo,classinfo where stu_c_id=c_id ");
  30.             if (!txt.Equals(""))
  31.             {
  32.                 switch (cbo)
  33.                 {
  34.                     case "姓名":
  35.                         sql += string.Format(" and stu_name like '%{0}%'", txt);
  36.                         break;
  37.                     case "班级":
  38.                         sql += string.Format(" and c_name like '%{0}%'", txt);
  39.                         break;
  40.                     case "年龄":
  41.                         sql += string.Format(" and stu_age like '%{0}%'", txt);
  42.                         break;
  43.                     case "性别":
  44.                         sql += string.Format(" and stu_gender like '%{0}%'", txt);
  45.                         break;
  46.                     case "地址":
  47.                         sql += string.Format(" and stu_address like '%{0}%'", txt);
  48.                         break;
  49.                 }
  50.             }
  51.             this.dgv_stu.DataSource = DBHelper.GetTable(sql);
  52.         }
  54.         //绑定班级
  55.         public void Binding()
  56.         {
  57.             string sql1 = string.Format("select c_id,c_name from classinfo");
  58.             this.cbo_class.DisplayMember = "c_name";
  59.             this.cbo_class.ValueMember = "c_id";
  60.             this.cbo_class.DataSource = DBHelper.GetTable(sql1);
  61.         }
  63.         //窗体加载事件
  64.         private void stu_Load(object sender, EventArgs e)
  65.         {
  66.             Bind(string.Empty,string.Empty);
  67.             Binding();
  68.         }
  70.         //查找
  71.         private void btn_search_Click(object sender, EventArgs e)
  72.         {
  73.             string cbo=this.cbo_search.Text;
  74.             string txt=this.txt_search.Text.Trim();
  75.             Bind(cbo,txt);
  76.         }
  78.         //非空验证
  79.         public bool Input()
  80.         {
  81.             foreach (System.Windows.Forms.Control cc in groupBox3.Controls)
  82.             {
  83.                 if (cc is TextBox)
  84.                 {
  85.                     if (cc.Text.Equals(""))
  86.                     {
  87.                         MessageBox.Show("文本框不能为空！");
  88.                         return false;
  89.                     }
  90.                 }
  91.             }
  92.             return true;
  93.         }
  95.         //清空
  96.         public void Clear()
  97.         {
  98.             foreach (System.Windows.Forms.Control cc in groupBox3.Controls)
  99.             {
  100.                 if (cc is TextBox)
  101.                 {
  102.                     if (!cc.Text.Equals(""))
  103.                     {
  104.                         cc.Text = string.Empty;
  105.                     }
  106.                 }
  107.             }
  108.             this.cbo_class.SelectedValue= true;
  109.             this.rdo_man.Checked = true;
  110.         }
  112.         //数据申明
  113.         public static int id;
  114.         public static int c_id;
  115.         public static string name = string.Empty;
  116.         public static string c_name = string.Empty;
  117.         public static int age =0;
  118.         public static string gender = string.Empty;
  119.         public static string address = string.Empty;
  121.         //获取行索引
  122.         public void ShuJu()
  123.         {
  124.             name = this.txt_name.Text.Trim();
  125.             c_id =Convert.ToInt32(this.cbo_class.SelectedValue.ToString());
  126.             try
  127.             {
  128.                 age=Convert.ToInt32(this.txt_age.Text.Trim());
  129.                 if (age<0)
  130.                 {
  131.                     MessageBox.Show("请输入正确的年龄！");
  132.                     return;
  133.                 }
  135.             }
  136.             catch (Exception)
  137.             {
  138.                 MessageBox.Show("请输入正确的年龄！");
  139.                 return;
  140.             }
  141.             gender=this.rdo_man.Checked==true?"男":"女";
  142.             address = this.txt_address.Text.Trim();
  143.         }
  145.         //添加
  146.         private void btn_add_Click(object sender, EventArgs e)
  147.         {
  148.             if (Input())
  149.             {
  150.                 ShuJu();
  151.                 string sql2 = string.Format("insert into studentinfo values('{0}','{1}','{2}','{3}','{4}')",name,age,c_id,gender,address);
  152.                 int rult1 = DBHelper.ExecuteNonQuery(sql2);
  153.                 if (rult1>0)
  154.                 {
  155.                     MessageBox.Show("添加成功！");
  156.                     Bind(string.Empty,string.Empty);
  157.                     Clear();
  158.                     return;
  159.                 }
  160.                 else
  161.                 {
  162.                     MessageBox.Show("添加失败！");
  163.                     return;
  164.                 }
  165.             }
  166.         }
  168.         //修改
  169.         private void btn_update_Click(object sender, EventArgs e)
  170.         {
  171.             if (Input())
  172.             {
  173.                 ShuJu();
  174.                 string sql3 = string.Format("update studentinfo set stu_name='{0}',stu_age='{1}',stu_c_id='{2}',stu_gender='{3}',stu_address='{4}' where stu_id='{5}'",name,age,c_id,gender,address,id);
  175.                 int rult2 = DBHelper.ExecuteNonQuery(sql3);
  176.                 if (rult2>-0)
  177.                 {
  178.                     MessageBox.Show("修改成功！");
  179.                     Bind(string.Empty,string.Empty);
  180.                     Clear();
  181.                     return;
  182.                 }
  183.                 else
  184.                 {
  185.                     MessageBox.Show("修改失败！");
  186.                     return;
  187.                 }
  188.             }
  189.         }
  191.         //单击任意单元格事件
  192.         private void dgv_stu_CellClick(object sender, DataGridViewCellEventArgs e)
  193.         {
  194.             int rowIndex=this.dgv_stu.CurrentCell.RowIndex;
  195.             if (rowIndex > -1)
  196.             {
  197.                 if (this.dgv_stu[0,rowIndex].Value.ToString()!=string.Empty)
  198.                 {
  199.                     id =Convert.ToInt32(this.dgv_stu[0, rowIndex].Value.ToString());
  200.                     this.txt_name.Text = this.dgv_stu[1, rowIndex].Value.ToString();
  201.                     this.cbo_class.Text = this.dgv_stu[2, rowIndex].Value.ToString();
  202.                     this.txt_age.Text = this.dgv_stu[3, rowIndex].Value.ToString();
  203.                     if (this.dgv_stu[4, rowIndex].Value.ToString() == "男")
  204.                     {
  205.                         this.rdo_man.Checked = true;
  206.                     }
  207.                     else
  208.                     {
  209.                         this.rdo_woman.Checked = true;
  210.                     }
  211.                     this.txt_address.Text = this.dgv_stu[5, rowIndex].Value.ToString();
  212.                 }
  213.                 else
  214.                 {
  215.                     MessageBox.Show("请选择有数据的行！");
  216.                     return;
  217.                 }
  218.             }
  219.         }
  221.         //删除
  222.         private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
  223.         {
  224.             if (Input())
  225.             {
  226.                 int rowIndex = this.dgv_stu.CurrentCell.RowIndex;
  227.                 if (rowIndex>-1)
  228.                 {
  229.                     if (this.dgv_stu[0,rowIndex].Value.ToString()!=string.Empty)
  230.                     {
  231.                         string sql4 = string.Format("delete studentinfo where stu_id='{0}'",id);
  232.                         int rult3 = DBHelper.ExecuteNonQuery(sql4);
  233.                         if (rult3>-1)
  234.                         {
  235.                             MessageBox.Show("删除成功！");
  236.                             Bind(string.Empty, string.Empty);
  237.                             Clear();
  238.                             return;
  239.                         }
  240.                         else
  241.                         {
  242.                             MessageBox.Show("删除失败！");
  243.                             return;
  244.                         }
  245.                     }
  246.                     else
  247.                     {
  248.                         MessageBox.Show("请选择有数据的行！");
  249.                         return;
  250.                     }
  251.                 }
  252.             }
  253.         }
  254.     }
  255. }


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