java 连接数据库

package com.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBhelper {
    /**
     * 数据库用户名
     */
    private static final String USERNAME="test";
    /**
     * 数据库密码
     */
    private static final String PASSWORD="123456";
    /**
     * 加载数据库驱动
     */
    private static final String DRIVER="oracle.jdbc.OracleDriver";
    /**
     * 获取数据库地址
     */
    private static final String URL="jdbc:oracle:thin:@localhost:1521:orcl";
    
    /**
     * 获取数据库连接
     */
    public static Connection getOracleConnection(){
        Connection conn = null;
        try {
            Class.forName(DRIVER);
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;    
    }
    /**
     * 释放资源
     */
    public static void destroy(Connection conn, Statement st, ResultSet rs){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(st!=null){
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        conn=null;
        st=null;
        rs=null;
    }
}