DbUtils常用API的使用 方便以后查阅

 package com.lizhou.Test;

 import java.sql.SQLException;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;

 import javax.sql.DataSource;

 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.ArrayHandler;
 import org.apache.commons.dbutils.handlers.ArrayListHandler;
 import org.apache.commons.dbutils.handlers.BeanHandler;
 import org.apache.commons.dbutils.handlers.BeanListHandler;
 import org.apache.commons.dbutils.handlers.MapHandler;
 import org.apache.commons.dbutils.handlers.MapListHandler;
 import org.apache.commons.dbutils.handlers.ScalarHandler;

 import com.lizhou.Domain.Account;
 import com.lizhou.Util.MysqlUtil;

 /**
  * DbUtils框架的使用
  * 目的：减轻CURD操作
  * DbUtils框架最核心的类，就是QueryRunner类，构造其有空参构造和带连接池(DataSource)的构造
  *
  *
  *
  * @author bojiangzhou
  *
  */
 public class DbUtils {

     public static void main(String[] args) {
         /**
          * 数据库为test,在c3p0-config.xml中配置
          */

 //        queryRunner();

         //下面是ResultSetHandler的接口的各种实现类的用法(7个实现类)

 //        beanHandler();        //针对JavaBean

 //        beanListHandler();    //针对JavaBean

 //        arrayHandler();        //针对数组

 //        arrayListHandler();    //针对数组

 //        mapHandler();        //针对Map

 //        mapListHandler();    //针对Map

         scalarHandler();    //针对Long

     }

     //QueryRunner
     public static void queryRunner(){
         //获取连接池
         DataSource ds = MysqlUtil.getPool();
         //用连接池构造一个QueryRunner
         QueryRunner qr = new QueryRunner(ds);

 //        String sql = "update account set name=? where id=?";
         String sql = "insert into account(name, money) values(?, ?)";

         try {
 //            qr.update(sql, new Object[]{"O(∩_∩)O哈哈~", 2});
             qr.update(sql, new Object[]{"一生有你", 25000});
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     //BeanHandler
     public static void beanHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select * from account where id = ?";

         try {
             Account acc = (Account) qr.query(sql, new Object[]{3}, new BeanHandler(Account.class));
             System.out.println(acc.getId()+"    "+acc.getName()+"    "+acc.getMoney());
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }

     //BeanListHandler
     public static void beanListHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select * from account";

         try {
             List<Account> accounts =  (List<Account>) qr.query(sql, new BeanListHandler(Account.class));
             for(Account a : accounts){
                 System.out.println(a.getId()+"    "+a.getName()+"    "+a.getMoney());
             }
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }        

     //ArrayHandler
     public static void arrayHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select * from account where money=?";

         try {
             Object[] a = (Object[]) qr.query(sql, 10000, new ArrayHandler());
             for(int i = 0;i < a.length;i++){
                 System.out.print(a[i]+"    ");
             }
             System.out.println("\n------------------------------");
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }    

     //ArrayListHandler
     public static void arrayListHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select * from account";

         try {
              List<Object[]> accounts = (List<Object[]>) qr.query(sql, new ArrayListHandler());
             for(Object[] obj : accounts){
                 for(int i = 0;i < obj.length;i++){
                     System.out.print(obj[i]+"    ");
                 }
                 System.out.println("\n------------------------------");
             }
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }    

     //MapHandler
     public static void mapHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select * from account";

         try {
              Map<Object, Object> map = (Map<Object, Object>) qr.query(sql, new MapHandler());
              Set<Entry<Object, Object>> entry = map.entrySet();
              for(Entry e : entry){
                  System.out.print(e.getKey()+"    ");
                  System.out.println(e.getValue());
              }
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }    

     //MapListHandler
     public static void mapListHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select * from account";

         try {
              List< Map<Object, Object> > maps = (List<Map<Object, Object>>) qr.query(sql, new MapListHandler());
              for(Map<Object, Object> map : maps){
                  Set<Entry<Object, Object>> entry = map.entrySet();
                  for(Entry e : entry){
                      System.out.print(e.getKey()+"    ");
                      System.out.println(e.getValue());
                  }
                  System.out.println("-------------------------");
              }

         } catch (SQLException e) {
             e.printStackTrace();
         }
     }    

     //ScalarHandler 只返回一行一列数据
     public static void scalarHandler(){
         QueryRunner qr = new QueryRunner(MysqlUtil.getPool());

         String sql = "select count(*) from account";

         try {
              Object obj = qr.query(sql, new ScalarHandler());
              System.out.println(obj);
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }    

 }