jdbc链接数据库（oracle10g）

---------jdbc中oracle连接如下

首先是。连接数控的类的操作

1、package db;
import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;
import bean.Person;
/**

*

* 创建数据库的链接

* @author Administrator

*

*/

public class Db {

private String url="JDBC:oracle:thin:@localhost:1521:HYX";

private String user="orcl";

private String password="orcl";

private Connection connection=null;

private PreparedStatement pstat=null;

private Statement stat=null;

private ResultSet rs ;

public List list;

// 构造函数

public Db() {

try {

Class.forName("oracle.jdbc.OracleDriver");

try {

connection=DriverManager.getConnection(url,user,password);

System.out.println("-------------->0k");

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}
//查询的方法实现

public ResultSet find(String sql){

rs=null;

try {

list=new ArrayList();

Person person=new Person();

stat=connection.createStatement();

rs=stat.executeQuery(sql);

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return rs;

}

//增加数据的方法

public int sava(String name,String pwd) {

int result=0;

try {

String sql="insert into hyx(id,name,password) values(SEQUENCESONE.NEXTVAL,'"+name+"','"+pwd+"')";

stat=connection.createStatement();

System.out.println("------->>>"+sql);

result=stat.executeUpdate(sql);

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

close(); //关闭数据库链接

}

return result;

}

//关闭连接

public void close(){

if(null!=connection){

try {

connection.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}
}

大家可以可以自己写一个测试类测试一把，把链接都改成你来的链接，测试下是否连的上数据库

--本人测试通过

package db;

import java.sql.ResultSet;

import java.sql.SQLException;

public class TestOracle {

/**

* @param args

*/

public static void main(String[] args) {

Db db=new Db();

// TODO Auto-generated method stub

try {

String sql="select * from hyx";

ResultSet rs= db.find(sql);

while(rs.next()){

System.out.println(rs.getString(1)+rs.getString(2)+rs.getString(3));

}

}catch(Exception e){

e.printStackTrace();

}

}

}

--------------如下是servelt的中调用数据库的操作，只看jdbc的话可以不看如下servlet的调用操作
jsp和web.xml 的配置就不赘述了
其次servlet 控制类
package testone;
import java.io.IOException;
import javax.servlet.RequestDispatcher;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;
import db.Db;
public class ReqServlet extends HttpServlet {

private String sql;
protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

// TODO Auto-generated method stub

Db db=new Db();

req.setCharacterEncoding("gb2312");

String username=req.getParameter("name");

String password=req.getParameter("pwd");

System.out.println(username+password);

resp.setContentType("text/html; charset=gb2312");
ServletContext sc = getServletContext();
RequestDispatcher rd = null;
if(!username.equals("")&&!password.equals("")){

int rs=db.sava(username, password);

if(rs==1){

req.setAttribute("msg", "用户名:"+username+" "+"密码："+password);

rd=sc.getRequestDispatcher("/responseshow.jsp"); //定向页面

rd.forward(req, resp);

}else{

rd=sc.getRequestDispatcher("/error.jsp"); //定向页面

rd.forward(req, resp);

// resp.setContentType("/error.jsp");

System.out.println("————————————————》失败");

}

}

}

}