对datagridview进行增删改(B)

  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

 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=stu;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 }

编码过程中的sql语句

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;
  10. namespace stu
  11. {
  12. public partial class stu : Form
  13. {
  14. public stu()
  15. {
  16. InitializeComponent();
  17. }
  18. //返回
  19. private void btn_esc_Click(object sender, EventArgs e)
  20. {
  21. Bind(string.Empty,string.Empty);
  22. }
  23. //绑定、查找
  24. public void Bind(string cbo, string txt)
  25. {
  26. this.cbo_search.SelectedIndex = 0;
  27. 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 ");
  28. if (!txt.Equals(""))
  29. {
  30. switch (cbo)
  31. {
  32. case "姓名":
  33. sql += string.Format(" and stu_name like ‘%{0}%‘", txt);
  34. break;
  35. case "班级":
  36. sql += string.Format(" and c_name like ‘%{0}%‘", txt);
  37. break;
  38. case "年龄":
  39. sql += string.Format(" and stu_age like ‘%{0}%‘", txt);
  40. break;
  41. case "性别":
  42. sql += string.Format(" and stu_gender like ‘%{0}%‘", txt);
  43. break;
  44. case "地址":
  45. sql += string.Format(" and stu_address like ‘%{0}%‘", txt);
  46. break;
  47. }
  48. }
  49. this.dgv_stu.DataSource = DBHelper.GetTable(sql);
  50. }
  51. //绑定班级
  52. public void Binding()
  53. {
  54. string sql1 = string.Format("select c_id,c_name from classinfo");
  55. this.cbo_class.DisplayMember = "c_name";
  56. this.cbo_class.ValueMember = "c_id";
  57. this.cbo_class.DataSource = DBHelper.GetTable(sql1);
  58. }
  59. //窗体加载事件
  60. private void stu_Load(object sender, EventArgs e)
  61. {
  62. Bind(string.Empty,string.Empty);
  63. Binding();
  64. }
  65. //查找
  66. private void btn_search_Click(object sender, EventArgs e)
  67. {
  68. string cbo=this.cbo_search.Text;
  69. string txt=this.txt_search.Text.Trim();
  70. Bind(cbo,txt);
  71. }
  72. //非空验证
  73. public bool Input()
  74. {
  75. foreach (System.Windows.Forms.Control cc in groupBox3.Controls)
  76. {
  77. if (cc is TextBox)
  78. {
  79. if (cc.Text.Equals(""))
  80. {
  81. MessageBox.Show("文本框不能为空！");
  82. return false;
  83. }
  84. }
  85. }
  86. return true;
  87. }
  88. //清空
  89. public void Clear()
  90. {
  91. foreach (System.Windows.Forms.Control cc in groupBox3.Controls)
  92. {
  93. if (cc is TextBox)
  94. {
  95. if (!cc.Text.Equals(""))
  96. {
  97. cc.Text = string.Empty;
  98. }
  99. }
  100. }
  101. this.cbo_class.SelectedValue= true;
  102. this.rdo_man.Checked = true;
  103. }
  104. //数据申明
  105. public static int id;
  106. public static int c_id;
  107. public static string name = string.Empty;
  108. public static string c_name = string.Empty;
  109. public static int age =0;
  110. public static string gender = string.Empty;
  111. public static string address = string.Empty;
  112. //获取行索引
  113. public void ShuJu()
  114. {
  115. name = this.txt_name.Text.Trim();
  116. c_id =Convert.ToInt32(this.cbo_class.SelectedValue.ToString());
  117. try
  118. {
  119. age=Convert.ToInt32(this.txt_age.Text.Trim());
  120. if (age<0)
  121. {
  122. MessageBox.Show("请输入正确的年龄！");
  123. return;
  124. }
  125. }
  126. catch (Exception)
  127. {
  128. MessageBox.Show("请输入正确的年龄！");
  129. return;
  130. }
  131. gender=this.rdo_man.Checked==true?"男":"女";
  132. address = this.txt_address.Text.Trim();
  133. }
  134. //添加
  135. private void btn_add_Click(object sender, EventArgs e)
  136. {
  137. if (Input())
  138. {
  139. ShuJu();
  140. string sql2 = string.Format("insert into studentinfo values(‘{0}‘,‘{1}‘,‘{2}‘,‘{3}‘,‘{4}‘)",name,age,c_id,gender,address);
  141. int rult1 = DBHelper.ExecuteNonQuery(sql2);
  142. if (rult1>0)
  143. {
  144. MessageBox.Show("添加成功！");
  145. Bind(string.Empty,string.Empty);
  146. Clear();
  147. return;
  148. }
  149. else
  150. {
  151. MessageBox.Show("添加失败！");
  152. return;
  153. }
  154. }
  155. }
  156. //修改
  157. private void btn_update_Click(object sender, EventArgs e)
  158. {
  159. if (Input())
  160. {
  161. ShuJu();
  162. 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);
  163. int rult2 = DBHelper.ExecuteNonQuery(sql3);
  164. if (rult2>-0)
  165. {
  166. MessageBox.Show("修改成功！");
  167. Bind(string.Empty,string.Empty);
  168. Clear();
  169. return;
  170. }
  171. else
  172. {
  173. MessageBox.Show("修改失败！");
  174. return;
  175. }
  176. }
  177. }
  178. //单击任意单元格事件
  179. private void dgv_stu_CellClick(object sender, DataGridViewCellEventArgs e)
  180. {
  181. int rowIndex=this.dgv_stu.CurrentCell.RowIndex;
  182. if (rowIndex > -1)
  183. {
  184. if (this.dgv_stu[0,rowIndex].Value.ToString()!=string.Empty)
  185. {
  186. id =Convert.ToInt32(this.dgv_stu[0, rowIndex].Value.ToString());
  187. this.txt_name.Text = this.dgv_stu[1, rowIndex].Value.ToString();
  188. this.cbo_class.Text = this.dgv_stu[2, rowIndex].Value.ToString();
  189. this.txt_age.Text = this.dgv_stu[3, rowIndex].Value.ToString();
  190. if (this.dgv_stu[4, rowIndex].Value.ToString() == "男")
  191. {
  192. this.rdo_man.Checked = true;
  193. }
  194. else
  195. {
  196. this.rdo_woman.Checked = true;
  197. }
  198. this.txt_address.Text = this.dgv_stu[5, rowIndex].Value.ToString();
  199. }
  200. else
  201. {
  202. MessageBox.Show("请选择有数据的行！");
  203. return;
  204. }
  205. }
  206. }
  207. //删除
  208. private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
  209. {
  210. if (Input())
  211. {
  212. int rowIndex = this.dgv_stu.CurrentCell.RowIndex;
  213. if (rowIndex>-1)
  214. {
  215. if (this.dgv_stu[0,rowIndex].Value.ToString()!=string.Empty)
  216. {
  217. string sql4 = string.Format("delete studentinfo where stu_id=‘{0}‘",id);
  218. int rult3 = DBHelper.ExecuteNonQuery(sql4);
  219. if (rult3>-1)
  220. {
  221. MessageBox.Show("删除成功！");
  222. Bind(string.Empty, string.Empty);
  223. Clear();
  224. return;
  225. }
  226. else
  227. {
  228. MessageBox.Show("删除失败！");
  229. return;
  230. }
  231. }
  232. else
  233. {
  234. MessageBox.Show("请选择有数据的行！");
  235. return;
  236. }
  237. }
  238. }
  239. }
  240. }
  241. }
时间： 2024-10-07 20:09:42

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