对datagridview进行增删改(B)

 create DATABASE stu

 ON

 (

    name='stu.mdf',

    filename='F:\胡浴东\数据库\stu数据库\stu.mdf',

    size=,

    filegrowth=

 )

 log ON

 (

   name='stu_log.ldf',

    filename='F:\胡浴东\数据库\stu数据库\stu_log.ldf',

    size=,

    filegrowth=

 )

 go

 USE [stu]

 GO

 /****** Object:  Table [dbo].[classinfo]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 SET ANSI_PADDING ON

 GO

 CREATE TABLE [dbo].[classinfo](

     [c_id] [int] IDENTITY(,) NOT NULL,

     [c_dep_id] [int] NULL,

     [c_name] [varchar]() NULL,

 PRIMARY KEY CLUSTERED

 (

     [c_id] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 SET ANSI_PADDING OFF

 GO

 /****** Object:  Table [dbo].[department]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 SET ANSI_PADDING ON

 GO

 CREATE TABLE [dbo].[department](

     [dep_id] [int] IDENTITY(,) NOT NULL,

     [dep_name] [varchar]() NULL,

 PRIMARY KEY CLUSTERED

 (

     [dep_id] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 SET ANSI_PADDING OFF

 GO

 /****** Object:  Table [dbo].[logins]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 SET ANSI_PADDING ON

 GO

 CREATE TABLE [dbo].[logins](

     [l_no] [varchar]() NOT NULL,

     [l_pwd] [varchar]() NOT NULL,

     [l_question] [varchar]() NOT NULL,

     [l_answer] [varchar]() NOT NULL,

 PRIMARY KEY CLUSTERED

 (

     [l_no] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 SET ANSI_PADDING OFF

 GO

 /****** Object:  Table [dbo].[member]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 SET ANSI_PADDING ON

 GO

 CREATE TABLE [dbo].[member](

     [username] [varchar]() NOT NULL,

     [pwd] [varchar]() NOT NULL,

     [name] [varchar]() NULL,

     [gender] [char]() NULL,

     [age] [varchar]() NULL,

     [enjoy] [varchar]() NULL,

 PRIMARY KEY CLUSTERED

 (

     [username] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 SET ANSI_PADDING OFF

 GO

 /****** Object:  Table [dbo].[result]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 CREATE TABLE [dbo].[result](

     [r_id] [int] IDENTITY(,) NOT NULL,

     [r_sub_id] [int] NULL,

     [r_stu_id] [int] NULL,

     [r_result] [int] NULL,

 PRIMARY KEY CLUSTERED

 (

     [r_id] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 /****** Object:  Table [dbo].[studentinfo]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 SET ANSI_PADDING ON

 GO

 CREATE TABLE [dbo].[studentinfo](

     [stu_id] [int] IDENTITY(,) NOT NULL,

     [stu_name] [varchar]() NOT NULL,

     [stu_age] [int] NULL,

     [stu_c_id] [int] NULL,

     [stu_gender] [char]() NULL,

     [stu_address] [varchar]() NULL,

 PRIMARY KEY CLUSTERED

 (

     [stu_id] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 SET ANSI_PADDING OFF

 GO

 /****** Object:  Table [dbo].[subject]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 SET ANSI_PADDING ON

 GO

 CREATE TABLE [dbo].[subject](

     [sub_id] [int] IDENTITY(,) NOT NULL,

     [sub_name] [varchar]() NULL,

 PRIMARY KEY CLUSTERED

 (

     [sub_id] ASC

 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

 ) ON [PRIMARY]

 GO

 SET ANSI_PADDING OFF

 GO

 /****** Object:  View [dbo].[v_cool]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 create view [dbo].[v_cool]

 as

 select s.stu_id,d.dep_name,c.c_name,s.stu_name,

 s.stu_age,s.stu_gender,s.stu_address

   from studentinfo s,classinfo c,department d

 where s.stu_c_id=c.c_id and c.c_dep_id=d.dep_id

 GO

 /****** Object:  View [dbo].[v_ggg]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 create view [dbo].[v_ggg]

 as

 select s.stu_id  学员编号,s.stu_name 学员姓名,

 s.stu_age 年龄,c.c_name 班级,s.stu_gender 性别,

 s.stu_address 住址

      from studentinfo s,classinfo c

 where s.stu_c_id=c.c_id

 GO

 /****** Object:  View [dbo].[View_cc]    Script Date: 2015/5/11 10:14:54 ******/

 SET ANSI_NULLS ON

 GO

 SET QUOTED_IDENTIFIER ON

 GO

 CREATE VIEW [dbo].[View_cc]

 AS

 SELECT   dbo.classinfo.c_name, dbo.department.dep_name, dbo.studentinfo.stu_age, dbo.studentinfo.stu_name,

                 dbo.studentinfo.stu_gender, dbo.studentinfo.stu_address

 FROM      dbo.classinfo INNER JOIN

                 dbo.department ON dbo.classinfo.c_dep_id = dbo.department.dep_id INNER JOIN

                 dbo.studentinfo ON dbo.classinfo.c_id = dbo.studentinfo.stu_c_id

 GO

 SET IDENTITY_INSERT [dbo].[classinfo] ON 

 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (, , N'')

 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (, , N'')

 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (, , N'')

 INSERT [dbo].[classinfo] ([c_id], [c_dep_id], [c_name]) VALUES (, , N'')

 SET IDENTITY_INSERT [dbo].[classinfo] OFF

 SET IDENTITY_INSERT [dbo].[department] ON 

 INSERT [dbo].[department] ([dep_id], [dep_name]) VALUES (, N'环化系')

 INSERT [dbo].[department] ([dep_id], [dep_name]) VALUES (, N'汽车系')

 INSERT [dbo].[department] ([dep_id], [dep_name]) VALUES (, N'信息智能系')

 SET IDENTITY_INSERT [dbo].[department] OFF

 INSERT [dbo].[logins] ([l_no], [l_pwd], [l_question], [l_answer]) VALUES (N'cool', N'', N'', N'')

 INSERT [dbo].[logins] ([l_no], [l_pwd], [l_question], [l_answer]) VALUES (N'jack', N'', N'', N'')

 INSERT [dbo].[logins] ([l_no], [l_pwd], [l_question], [l_answer]) VALUES (N'徐凯伦', N'', N'', N'')

 INSERT [dbo].[member] ([username], [pwd], [name], [gender], [age], [enjoy]) VALUES (N'tom', N'', N'ss', N'男', N'90后', N'美女 帅哥 ')

 INSERT [dbo].[member] ([username], [pwd], [name], [gender], [age], [enjoy]) VALUES (N'tom1', N'', N'ss', N'男', N'90后', N'美女 帅哥 ')

 SET IDENTITY_INSERT [dbo].[result] ON 

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 INSERT [dbo].[result] ([r_id], [r_sub_id], [r_stu_id], [r_result]) VALUES (, , , )

 SET IDENTITY_INSERT [dbo].[result] OFF

 SET IDENTITY_INSERT [dbo].[studentinfo] ON 

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'浩然刘', , , N'男', N'湖北宜昌')

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'柯梦', , , N'女', N'湖北十堰')

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'林智健', , , N'男', N'湖北天门')

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'刘畅', , , N'男', N'湖北十堰')

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'齐白石', , , N'男', N'湖北襄樊')

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'刘佳', , , N'男', N'湖北十堰')

 INSERT [dbo].[studentinfo] ([stu_id], [stu_name], [stu_age], [stu_c_id], [stu_gender], [stu_address]) VALUES (, N'张馨文', , , N'男', N'甘肃')

 SET IDENTITY_INSERT [dbo].[studentinfo] OFF

 SET IDENTITY_INSERT [dbo].[subject] ON 

 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (, N'C#')

 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (, N'html')

 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (, N'sqlserver')

 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (, N'环境监测')

 INSERT [dbo].[subject] ([sub_id], [sub_name]) VALUES (, N'汽车维修')

 SET IDENTITY_INSERT [dbo].[subject] OFF

 SET ANSI_PADDING ON

 GO

 /****** Object:  Index [UQ__classinf__29397C81D09B43E9]    Script Date: 2015/5/11 10:14:54 ******/

 ALTER TABLE [dbo].[classinfo] ADD UNIQUE NONCLUSTERED

 (

     [c_name] ASC

 )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]

 GO

 SET ANSI_PADDING ON

 GO

 /****** Object:  Index [UQ__departme__7BE54950D8CB39D9]    Script Date: 2015/5/11 10:14:54 ******/

 ALTER TABLE [dbo].[department] ADD UNIQUE NONCLUSTERED

 (

     [dep_name] ASC

 )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]

 GO

 SET ANSI_PADDING ON

 GO

 /****** Object:  Index [UQ__subject__99BD2209CE37D31B]    Script Date: 2015/5/11 10:14:54 ******/

 ALTER TABLE [dbo].[subject] ADD UNIQUE NONCLUSTERED

 (

     [sub_name] ASC

 )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]

 GO

 ALTER TABLE [dbo].[studentinfo] ADD  DEFAULT ('湖北十堰') FOR [stu_address]

 GO

 ALTER TABLE [dbo].[classinfo]  WITH CHECK ADD FOREIGN KEY([c_dep_id])

 REFERENCES [dbo].[department] ([dep_id])

 GO

 ALTER TABLE [dbo].[result]  WITH CHECK ADD FOREIGN KEY([r_stu_id])

 REFERENCES [dbo].[studentinfo] ([stu_id])

 GO

 ALTER TABLE [dbo].[result]  WITH CHECK ADD FOREIGN KEY([r_sub_id])

 REFERENCES [dbo].[subject] ([sub_id])

 GO

 ALTER TABLE [dbo].[studentinfo]  WITH CHECK ADD FOREIGN KEY([stu_c_id])

 REFERENCES [dbo].[classinfo] ([c_id])

 GO

 ALTER TABLE [dbo].[member]  WITH CHECK ADD CHECK  (([gender]='女' OR [gender]='男'))

 GO

 ALTER TABLE [dbo].[studentinfo]  WITH CHECK ADD CHECK  (([stu_age]>=() AND [stu_age]<=()))

 GO

 ALTER TABLE [dbo].[studentinfo]  WITH CHECK ADD CHECK  (([stu_gender]='女' OR [stu_gender]='男'))

 GO

 EXEC sys.sp_addextendedproperty @name=N'MS_DiagramPane1', @value=N'[0E232FF0-B466-11cf-A24F-00AA00A3EFFF, 1.00]

 Begin DesignProperties =

    Begin PaneConfigurations =

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1[11] 4[56] 2[16] 3) )"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1 [50] 4 [25] 3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1 [50] 2 [25] 3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (4 [30] 2 [40] 3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1 [56] 3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (2 [66] 3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (4 [50] 3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(V (3))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1[56] 4[18] 2) )"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1 [75] 4))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1[66] 2) )"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (4 [60] 2))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(H (1) )"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(V (4))"

       End

       Begin PaneConfiguration =

          NumPanes =

          Configuration = "(V (2))"

       End

       ActivePaneConfig =

    End

    Begin DiagramPane =

       Begin Origin =

          Top = -

          Left =

       End

       Begin Tables =

          Begin Table = "classinfo"

             Begin Extent =

                Top =

                Left =

                Bottom =

                Right =

             End

             DisplayFlags =

             TopColumn =

          End

          Begin Table = "department"

             Begin Extent =

                Top =

                Left =

                Bottom =

                Right =

             End

             DisplayFlags =

             TopColumn =

          End

          Begin Table = "studentinfo"

             Begin Extent =

                Top =

                Left =

                Bottom =

                Right =

             End

             DisplayFlags =

             TopColumn =

          End

       End

    End

    Begin SQLPane =

    End

    Begin DataPane =

       Begin ParameterDefaults = ""

       End

    End

    Begin CriteriaPane =

       Begin ColumnWidths =

          Column =

          Alias =

          Table =

          Output =

          Append =

          NewValue =

          SortType =

          SortOrder =

          GroupBy =

          Filter =

          Or =

          Or =

          Or =

       End

    End

 End

 ' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'VIEW',@level1name=N'View_cc'

 GO

 EXEC sys.sp_addextendedproperty @name=N'MS_DiagramPaneCount', @value= , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'VIEW',@level1name=N'View_cc'

 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：

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Data;

 using System.Data.SqlClient;

 namespace Phone

 {

     class DBHelper

     {

         public static readonly string Constring = "Data Source=.;Initial Catalog=Phone;Integrated Security=True";//连接数据库

         public static SqlConnection con = new SqlConnection(Constring);

         //打开数据库

         public static void ConOpen()

         {

             if (con.State==ConnectionState.Closed)

             {

                 con.Open();

             }

         }

         //关闭数据库

         public static void ConClose()

         {

             if (con.State != ConnectionState.Closed)

             {

                 con.Close();

             }

         }

         //查询有三种方法

         //方法一

         public static DataTable getTable(string sql)

         {

             ConOpen();

             SqlDataAdapter apt = new SqlDataAdapter(sql, con);

             DataTable dt = new DataTable();

             apt.Fill(dt);

             return dt;

         }

         //方法二

         public static SqlDataReader getReader(string sql)

         {

             ConOpen();

             SqlCommand cmd = new SqlCommand(sql,con);

             SqlDataReader reader = cmd.ExecuteReader();

             return reader;

         }

         //方法三

         public static Object Scalar(string sql)

         {

             ConOpen();

             SqlCommand cmd = new SqlCommand(sql,con);

             object obj = cmd.ExecuteScalar();

             ConClose();

             return obj;

         }

         //增加删除修改

         public static int ExecuteNonQuery(string sql)

         {

             int rult=;

             try

             {

                 ConOpen();

                 SqlCommand cmd = new SqlCommand(sql, con);

                 rult = cmd.ExecuteNonQuery();

             }

             catch (Exception)

             {

                 ;

             }

             finally

             {

                 ConClose();

             }

             return rult;

         }

     }

 }

DBHelper

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace stu
{
public partial class stu : Form
{
public stu()
{
InitializeComponent();
}
//返回
private void btn_esc_Click(object sender, EventArgs e)
{
Bind(string.Empty,string.Empty);
}
//绑定、查找
public void Bind(string cbo, string txt)
{
this.cbo_search.SelectedIndex = 0;
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 ");
if (!txt.Equals(""))
{
switch (cbo)
{
case "姓名":
sql += string.Format(" and stu_name like '%{0}%'", txt);
break;
case "班级":
sql += string.Format(" and c_name like '%{0}%'", txt);
break;
case "年龄":
sql += string.Format(" and stu_age like '%{0}%'", txt);
break;
case "性别":
sql += string.Format(" and stu_gender like '%{0}%'", txt);
break;
case "地址":
sql += string.Format(" and stu_address like '%{0}%'", txt);
break;
}
}
this.dgv_stu.DataSource = DBHelper.GetTable(sql);
}
//绑定班级
public void Binding()
{
string sql1 = string.Format("select c_id,c_name from classinfo");
this.cbo_class.DisplayMember = "c_name";
this.cbo_class.ValueMember = "c_id";
this.cbo_class.DataSource = DBHelper.GetTable(sql1);
}
//窗体加载事件
private void stu_Load(object sender, EventArgs e)
{
Bind(string.Empty,string.Empty);
Binding();
}
//查找
private void btn_search_Click(object sender, EventArgs e)
{
string cbo=this.cbo_search.Text;
string txt=this.txt_search.Text.Trim();
Bind(cbo,txt);
}
//非空验证
public bool Input()
{
foreach (System.Windows.Forms.Control cc in groupBox3.Controls)
{
if (cc is TextBox)
{
if (cc.Text.Equals(""))
{
MessageBox.Show("文本框不能为空！");
return false;
}
}
}
return true;
}
//清空
public void Clear()
{
foreach (System.Windows.Forms.Control cc in groupBox3.Controls)
{
if (cc is TextBox)
{
if (!cc.Text.Equals(""))
{
cc.Text = string.Empty;
}
}
}
this.cbo_class.SelectedValue= true;
this.rdo_man.Checked = true;
}
//数据申明
public static int id;
public static int c_id;
public static string name = string.Empty;
public static string c_name = string.Empty;
public static int age =0;
public static string gender = string.Empty;
public static string address = string.Empty;
//获取行索引
public void ShuJu()
{
name = this.txt_name.Text.Trim();
c_id =Convert.ToInt32(this.cbo_class.SelectedValue.ToString());
try
{
age=Convert.ToInt32(this.txt_age.Text.Trim());
if (age<0)
{
MessageBox.Show("请输入正确的年龄！");
return;
}
}
catch (Exception)
{
MessageBox.Show("请输入正确的年龄！");
return;
}
gender=this.rdo_man.Checked==true?"男":"女";
address = this.txt_address.Text.Trim();
}
//添加
private void btn_add_Click(object sender, EventArgs e)
{
if (Input())
{
ShuJu();
string sql2 = string.Format("insert into studentinfo values('{0}','{1}','{2}','{3}','{4}')",name,age,c_id,gender,address);
int rult1 = DBHelper.ExecuteNonQuery(sql2);
if (rult1>0)
{
MessageBox.Show("添加成功！");
Bind(string.Empty,string.Empty);
Clear();
return;
}
else
{
MessageBox.Show("添加失败！");
return;
}
}
}
//修改
private void btn_update_Click(object sender, EventArgs e)
{
if (Input())
{
ShuJu();
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);
int rult2 = DBHelper.ExecuteNonQuery(sql3);
if (rult2>-0)
{
MessageBox.Show("修改成功！");
Bind(string.Empty,string.Empty);
Clear();
return;
}
else
{
MessageBox.Show("修改失败！");
return;
}
}
}
//单击任意单元格事件
private void dgv_stu_CellClick(object sender, DataGridViewCellEventArgs e)
{
int rowIndex=this.dgv_stu.CurrentCell.RowIndex;
if (rowIndex > -1)
{
if (this.dgv_stu[0,rowIndex].Value.ToString()!=string.Empty)
{
id =Convert.ToInt32(this.dgv_stu[0, rowIndex].Value.ToString());
this.txt_name.Text = this.dgv_stu[1, rowIndex].Value.ToString();
this.cbo_class.Text = this.dgv_stu[2, rowIndex].Value.ToString();
this.txt_age.Text = this.dgv_stu[3, rowIndex].Value.ToString();
if (this.dgv_stu[4, rowIndex].Value.ToString() == "男")
{
this.rdo_man.Checked = true;
}
else
{
this.rdo_woman.Checked = true;
}
this.txt_address.Text = this.dgv_stu[5, rowIndex].Value.ToString();
}
else
{
MessageBox.Show("请选择有数据的行！");
return;
}
}
}
//删除
private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (Input())
{
int rowIndex = this.dgv_stu.CurrentCell.RowIndex;
if (rowIndex>-1)
{
if (this.dgv_stu[0,rowIndex].Value.ToString()!=string.Empty)
{
string sql4 = string.Format("delete studentinfo where stu_id='{0}'",id);
int rult3 = DBHelper.ExecuteNonQuery(sql4);
if (rult3>-1)
{
MessageBox.Show("删除成功！");
Bind(string.Empty, string.Empty);
Clear();
return;
}
else
{
MessageBox.Show("删除失败！");
return;
}
}
else
{
MessageBox.Show("请选择有数据的行！");
return;
}
}
}
}
}
}

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