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: [e-mail]*/
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: [e-mail]*/
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: [e-mail]*/
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);}}
}