数据库连接的代码

package cn.csdn.web.util;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

public class JdbcUtil {

//单例模式创建connection对象

private static Connection conn=null;

private static final String URL="jdbc:mysql://localhost:3306/3g?user=root&password=8058902&useUnicode=true&characterEncoding=UTF8";

//获取connection对象的静态方法

public static Connection getConn(){

if(conn==null){

//准备驱动程序

//创建链接对象

try {

Class.forName("com.mysql.jdbc.Driver");

conn= DriverManager.getConnection(URL);

} catch (Exception e) {

System.out.println("conn创建失败");

e.printStackTrace();

}

}

return conn;

}

public static void release(ResultSet rs,PreparedStatement pstmt){

if(rs!=null){

try {

rs.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

if(pstmt!=null){

try {

pstmt.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}