这个C#的程序怎样理解啊？本人菜鸟，请大侠们帮我解释解释！谢谢啊
using System;using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace StudentMIS
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
//string studentno, studentname, studentsex;
//int studentage;
//studentno = textBox1.Text;
//studentname = textBox2.Text;
//studentsex = textBox3.Text;
//studentage = int.Parse(textBox4.Text);
//string sqlstr = "insert into studentinfo values('98002','李四','女',24)";
//string sqlstr="delete from studentinfo where StudentSex='女'";
string sqlstr = "update studentinfo set studentAge=studentAge+3 where studentName='张三' ";
try
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += "Data Source=Student.mdb";
using (OleDbConnection conn = new OleDbConnection(strConnection))
{
OleDbCommand cmd = new OleDbCommand();
cmd.CommandText = sqlstr;
cmd.Connection = conn;
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show("添加信息成功", "提示");
cmd.Dispose();
conn.Close();
}
}
catch (System.Exception sqle)
{
MessageBox.Show(sqle.Message, "abc", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
}
}
private void button2_Click(object sender, EventArgs e)
{
string studentno, studentname, studentsex;
int studentage;
studentno = textBox1.Text;
studentname = textBox2.Text;
studentsex = textBox3.Text;
studentage = int.Parse(textBox4.Text);
// string sqlstr = "insert into studentinfo values('98002','李四','女',24)";
string sqlstr = "insert into studentinfo values('" + studentno + "',"+
"'"+studentname+"','"+studentsex+"',"+studentage+")";
// MessageBox.Show(sqlstr);
try
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += "Data Source=Student.mdb";
using (OleDbConnection conn = new OleDbConnection(strConnection))
{
OleDbCommand cmd = new OleDbCommand();
cmd.CommandText = sqlstr;
cmd.Connection = conn;
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show("添加信息成功", "提示");
cmd.Dispose();
conn.Close();
}
}
catch (System.Exception sqle)
{
MessageBox.Show(sqle.Message, "abc", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
}
}
}
} --------------------编程问答-------------------- 两个按钮，一个执行修改操作，一个执行插入操作 --------------------编程问答-------------------- button1:将张三的年龄加3
button2：新增一个学生 --------------------编程问答-------------------- 学习下........ --------------------编程问答-------------------- 谢谢哈，不过主要是这部分：
try
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += "Data Source=Student.mdb";
using (OleDbConnection conn = new OleDbConnection(strConnection))
{
OleDbCommand cmd = new OleDbCommand();
cmd.CommandText = sqlstr;
cmd.Connection = conn;
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show("添加信息成功", "提示");
cmd.Dispose();
conn.Close();
--------------------编程问答-------------------- 一个新增一个修改 --------------------编程问答-------------------- 看看数据库操作基础 --------------------编程问答--------------------
try
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += "Data Source=Student.mdb";
using (OleDbConnection conn = new OleDbConnection(strConnection)) //新建数据库连接
{
OleDbCommand cmd = new OleDbCommand(); //新建数据库命令
cmd.CommandText = sqlstr; //设置数据库命令
cmd.Connection = conn; //设置连接
conn.Open(); //打开数据库连接
cmd.ExecuteNonQuery(); //执行更新操作
MessageBox.Show("添加信息成功", "提示"); //弹出提示框
cmd.Dispose(); //销毁命令
conn.Close(); //关闭连接，建议将这步放入finally
--------------------编程问答--------------------
说得够仔细的了！ --------------------编程问答-------------------- 观摩观摩~ --------------------编程问答--------------------
C# code
try
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += "Data Source=Student.mdb";//数据库连接字符串，一般的话还要加用户名和密码的，
using (OleDbConnection conn = new OleDbConnection(strConnection)) //……
--------------------编程问答--------------------
这个说的很详细，之前你有一句我觉得不对，strConnection += "Data Source=Student.mdb";是指定服务器名，而不是指定数据库名吧，数据库名用database=Student.mdb;还有第一句是指定数据库提供程序，这里是System.Data.OleDb
--------------------编程问答--------------------
--------------------编程问答--------------------
ADO.NET多多看看！
--------------------编程问答--------------------
一个新增一个修改
--------------------编程问答--------------------
using (OleDbConnection conn = new OleDbConnection(strConnection)) //新建数据库连接
{
//
}
难不成是不理解这一段？ 这是一种特定的结构。
用using包裹的conn 会在这个花括号块结束的时候自动调用conn的dispose()方法（如果有的话）。
conn可以替换为其它的对象。
主要是用于自动释放资源。 --------------------编程问答--------------------
新手求问。
try
{
}
cath
{
}
是什么意思? --------------------编程问答--------------------
是
try
{
}
catch
{
}
吧？？
补充：.NET技术 , C#
