数据库工具包的使用(commons-dbutils-1.2.jar)

朋友你还在为框架着急码？不用了，不会持久性框架照样可以开发高效的代码。如果你对Hibernate不是很了解，你的代码效率也会很烂! 如果你对IBatis不是很了解也不想学习，又想开发高效的项目，那么我建议你使用JDBC。如果你对JDBC感觉很，我推荐学习commons-dbutils使用，Common Dbutils是操作数据库的组件，对传统操作数据库的类进行二次封装，可以把结果集转化成List。

主要方法：

 

DbUtils类：启动类

ResultSetHandler接口：转换类型接口

MapListHandler类：实现类，把记录转化成List

BeanListHandler类：实现类，把记录转化成List，使记录为JavaBean类型的对象

Qrery Runner类：执行SQL语句的类

建立三个Java文件，命名为

BeanListExample.java

Guestbook.java

MapListExample.java

/**
 *  ClassName: BeanListExample.java
 *  created on 2012-4-15
 *  Copyrights 2012 yjde All rights reserved.
 *  site: http://blog.csdn.net/tjcyjd
 *  email: [email protected]
 */
package com.sy;

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

import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

/**
 * Class Description:
 * 
 * @author yjde
 */
public class BeanListExample {
	public static void main(String[] args) {
		Connection conn = null;
		String url = "jdbc:mysql://localhost:3306/people";
		String jdbcDriver = "com.mysql.jdbc.Driver";
		String user = "root";
		String password = "hicc";

		DbUtils.loadDriver(jdbcDriver);
		try {
			conn = DriverManager.getConnection(url, user, password);
			QueryRunner qr = new QueryRunner();
			List results = (List) qr.query(conn,
					"select id,name from guestbook", new BeanListHandler(
							Guestbook.class));
			for (int i = 0; i < results.size(); i++) {
				Guestbook gb = (Guestbook) results.get(i);
				System.out
						.println("id:" + gb.getId() + ",name:" + gb.getName());
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			DbUtils.closeQuietly(conn);
		}
	}
}

/**
 *  ClassName: Guestbook.java
 *  created on 2012-4-15
 *  Copyrights 2012 yjde All rights reserved.
 *  site: http://blog.csdn.net/tjcyjd
 *  email: [email protected]
 */
package com.sy;

/**
 * Class Description:
 * 
 * @author yjde
 */
public class Guestbook {
	private Integer id;
	private String name;

	public Integer getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

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

/**
 *  ClassName: MapListExample.java
 *  created on 2012-4-15
 *  Copyrights 2012 yjde All rights reserved.
 *  site: http://blog.csdn.net/tjcyjd
 *  email: [email protected]
 */
package com.sy;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.MapListHandler;

/**
 * Class Description:
 * 
 * @author yjde
 */
public class MapListExample {
	public static void main(String[] args) {
		Connection conn = null;
		String url = "jdbc:mysql://localhost:3306/people";
		String jdbcDriver = "com.mysql.jdbc.Driver";
		String user = "root";
		String password = "hicc";

		DbUtils.loadDriver(jdbcDriver);
		try {
			conn = DriverManager.getConnection(url, user, password);
			QueryRunner qr = new QueryRunner();
			List results = (List) qr.query(conn,
					"select id,name from guestmessage", new MapListHandler());
			for (int i = 0; i < results.size(); i++) {
				Map map = (Map) results.get(i);
				System.out.println("id:" + map.get("id") + ",name:"
						+ map.get("name"));
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			DbUtils.closeQuietly(conn);
		}
	}
}