数据库连接工具类

package com.web.dao;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class UtilDao

{

Connection con=null;

String url="jdbc:oracle:thin:@localhost:1521:please";

public Connection getConnection()

{

try {

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

con=DriverManager.getConnection(url,"scott","tiger");

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return con;

}

public ResultSet doQuery(String sql)

{

ResultSet rs=null;

if(con==null)

{

this.getConnection();

}

try {

Statement st=con.createStatement();

rs=st.executeQuery(sql);

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return rs;

}

public void doUpdate(String sql)

{

if(con==null)

{

this.getConnection();

}

Statement st;

try {

st = con.createStatement();

st.execute(sql);

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public void doClose()

{

if(con!=null)

{

try {

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}