java实现的JDBCTemplate工具

1.DButil

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ResourceBundle;



/**

 * 数据库操作工具类

 * @author xrhou

 *

 */

public class DBUtils {

	

	//数据库连接地址

	public static String URL;

	//用户名

	public static String USERNAME;

	//密码

	public static String PASSWORD;

	//mysql的驱动类

	public static String DRIVER;

	

	private static ResourceBundle rb = ResourceBundle.getBundle("com.xrhou.util.db.db-config");

	

	private DBUtils(){}

	

	//使用静态块加载驱动程序

	static{

		URL = rb.getString("jdbc.url");

		USERNAME = rb.getString("jdbc.username");

		PASSWORD = rb.getString("jdbc.password");

		DRIVER = rb.getString("jdbc.driver");

		try {

			Class.forName(DRIVER);

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

	}

	//定义一个获取数据库连接的方法

	public static Connection getConnection(){

		Connection conn = null;

		try {

			conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);

		} catch (SQLException e) {

			e.printStackTrace();

			System.out.println("获取连接失败");

		}

		return conn;

	}

	

	/**

	 * 关闭数据库连接

	 * @param rs

	 * @param stat

	 * @param conn

	 */

	public static void close(ResultSet rs,Statement stat,Connection conn){

		try {

				if(rs!=null)rs.close();

				if(stat!=null)stat.close();

				if(conn!=null)conn.close();

		} catch (SQLException e) {

				e.printStackTrace();

		}

	}

	

}

　2.JdbcTemplete

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;



public class JdbcTemplete {

	/**

	 * 实现增删改的抽象

	 * @param sql

	 * @param args

	 */

	public int update(String sql,Object... args){

		Connection conn = null;

		PreparedStatement ps = null;

		try{

			conn = DBUtils.getConnection();

			ps = conn.prepareStatement(sql);

			//设置占位符的参数

			if(args!=null){

				for (int i = 0; i < args.length; i++) {

					ps.setObject(i+1, args[i]);

				}

			}

			return ps.executeUpdate();

		}catch(SQLException e){

			e.printStackTrace();

			return -1;

		}finally{

			DBUtils.close(null, ps, conn);

		}

	}

	/**

	 * 查询方法的抽象

	 * @param sql

	 * @param handler

	 * @param args

	 * @return

	 */

	public Object query(String sql,ResultSetHandler handler,Object... args){

		Connection conn  = null;

		PreparedStatement ps = null;

		ResultSet rs = null;

		try {

			conn = DBUtils.getConnection();

			ps = conn.prepareStatement(sql);

			if(args!=null){

				for (int i = 0; i < args.length; i++) {

					ps.setObject(i+1, args[i]);

				}

			}

			rs = ps.executeQuery();

			return handler.doHandler(rs);

		} catch (SQLException e) {

			e.printStackTrace();

			return null;

		}

		

	}

}

　　3.ResultSetHandler处理

import java.sql.ResultSet;

import java.sql.SQLException;



public interface ResultSetHandler {



	public Object doHandler(ResultSet rs) throws SQLException;

}

　　4.属性文件

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/friends

jdbc.username=root

jdbc.password=root