DBUtils使用（对jdbc的封装）

package com.mysql.demo;

import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.junit.Test;

import com.mysql.bean.user;

//增删改查
//用QueryRunner接口和ResultSetHandler
//增删改：1：queryRunner()方法获取数据流连接池的连接，2：在执行queryRunner提供的update()方法
//查询方法：1：queryRunner()获取连接。2：调用queryRunner的query()方法。在对结果集Handler,把数据封装为一个list集合
public class dbutil {

//使用dbutil完成数据库的crud
@Test
public void insert() throws SQLException
{
//获取数据库连接池操作数据库
QueryRunner run=new QueryRunner(sqlpooling.getDataSource());
String sql="insert into login values(?,?)";
Object params[]={"keke","keke"};
run.update(sql, params);
}
@Test
public void update() throws SQLException
{
//获取数据库连接池操作数据库
QueryRunner run=new QueryRunner(sqlpooling.getDataSource());
String sql="update login set password=? where username=?";
Object params[]={"789","keke"};
run.update(sql, params);
}

@Test
public void delete() throws SQLException
{
//获取数据库连接池操作数据库
QueryRunner run=new QueryRunner(sqlpooling.getDataSource());
String sql="delete from login where username=?";
//只有一个参数没必要准备参数数组了
run.update(sql, "simant");
}
@Test
public void find() throws SQLException
{
//获取数据库连接池操作数据库
QueryRunner run=new QueryRunner(sqlpooling.getDataSource());
String sql="select username,password from login where username=?";
user u=(user) run.query(sql,"keke",new BeanHandler(user.class));//把结果集处理到那个bean中去，创建userbean，这边省略
System.out.println(u.getPassword());

}
@Test
public void findAll() throws SQLException
{
//获取数据库连接池操作数据库
QueryRunner run=new QueryRunner(sqlpooling.getDataSource());
String sql="select * from login";
List uu=(List) run.query(sql,new BeanListHandler(user.class));
//多条记录的话用beanlistHandler处理到一个集合中去
Iterator<user> it=uu.iterator();
while(it.hasNext())
{
user u=it.next();
System.out.println(u.getUsername());
System.out.println(u.getPassword());
}

}
@Test
public void batch() throws SQLException//批量处理的话要插入多条记录，用二维数组
{
//获取数据库连接池操作数据库
QueryRunner run=new QueryRunner(sqlpooling.getDataSource());
String sql="insert into login values(?,?)";
Object param[][]=new Object[3][2];//大小为3的数组，大小为3的数组里面又是大小为2的数组
for(int i=0;i<param.length;i++)
{
param[i]=new Object[]{"name"+i,"password"+i};
}
run.batch(sql, param);

}
}