轻量级JDBC封装DBUtils简单教程

• 概述

apache commons DBUtils是一个轻量级的JDBC封装，它提供了一些Jdbc的操作封装来简化数据查询和记录读取操作，相比hibernate、mybatis这些ORM框架，DBUtils只能算是一个简单的工具，不过这也是DBUtils的最大优点，就是——简单。

• 包依赖

      只需要一个80多k的jar包即可：dbutils

• 核心类介绍

         org.apache.commons.dbutils.DbUtils——连接管理类，用于载入jdbcDriver以及关闭Connection。

org.apache.commons.dbutils.QueryRunner——执行类，用于执行增删改查操作。

org.apache.commons.dbutils.ResultSetHandler<T>——ORM映射接口，它的几个子接口实现了对Java Bean的映射，比如BeanHandler<T>、MapHandler、ArrayHandler和BeanListHandler<T>等。

• 简单示例

User对象：

package com.nomouse;

import java.util.Date;

public class User {
	private String id;
	private String name;
	private boolean sex;
	private Date birthday;
	private int count;
	private double price;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public boolean isSex() {
		return sex;
	}

	public void setSex(boolean sex) {
		this.sex = sex;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public int getCount() {
		return count;
	}

	public void setCount(int count) {
		this.count = count;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	public User(String id, String name, boolean sex, Date birthday, int count,
			double price) {
		super();
		this.id = id;
		this.name = name;
		this.sex = sex;
		this.birthday = birthday;
		this.count = count;
		this.price = price;
	}

	public User() {
		super();
	}

}

测试：

package com.nomouse;

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

import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;

public class Test {
	public static void main(String[] args) {
		Connection conn = null;
		String url = "jdbc:mysql://localhost:3306/test";
		String jdbcDriver = "com.mysql.jdbc.Driver";
		String user = "root";
		String password = "password01!";

		DbUtils.loadDriver(jdbcDriver);
		try {
			conn = DriverManager.getConnection(url, user, password);

			QueryRunner qr = new QueryRunner();

			String sql = "SELECT * FROM test where id=?";
			ResultSetHandler<User> userHandler = new BeanHandler<User>(
					User.class);
			User user1 = qr.query(conn, sql, userHandler, "0", "1");

			System.out.println(user1.getCount());

		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			DbUtils.closeQuietly(conn);
		}
	}
}