20160410javaweb之JDBC---DBUtils框架

package com.dzq.dbutils;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;
import org.junit.Test;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DbUtilsUpdate {
   
    @Test
    public void add() throws SQLException{
        QueryRunner runner=new QueryRunner(new ComboPooledDataSource());
        runner.update("update account set money=? where name=?",888,"a");
    }
}

package com.dzq.dbutils;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.junit.Test;

import com.dzq.domain.Account;
import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DBUtilsQuery {
   @Test
   public void find() throws SQLException{
       QueryRunner runner=new QueryRunner(new ComboPooledDataSource());
       String sql="select * from account where money>?";
     List<Account> list=  runner.query(sql, new ResultSetHandler<List<Account>>() {

        @Override
        public List<Account> handle(ResultSet rs) throws SQLException {
            List <Account> list =new ArrayList<Account>();
            while (rs.next()) {
                
                Account acc=new Account();
                acc.setId(rs.getInt("id"));
                acc.setName(rs.getString("name"));
                acc.setMoney(rs.getDouble("money"));
                list.add(acc);
            }
            return list;
        }
       
    },500);
     System.out.println(list);
   }
}

package com.itheima.dbutils;

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

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.ColumnListHandler;
import org.apache.commons.dbutils.handlers.KeyedHandler;
import org.apache.commons.dbutils.handlers.MapHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import org.junit.Test;

import com.itheima.domain.Account;
import com.mchange.v2.c3p0.ComboPooledDataSource;

public class RSHanlderDemo {
    //ScalarHandler:获取结果集中第一行数据指定列的值,常用来进行单值查询
    @Test
    public void tes9() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        Long count = (Long)runner.query("select count(*) from account",new ScalarHandler());
        System.out.println(count);
    }
    
    //KeyedHandler(name)：将结果集中的每一行数据都封装到一个Map里(List<Map>)，再把这些map再存到一个map里，其key为指定的列。
    @Test
    public void tes8() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
         Map<Object, Map<String, Object>> map = runner.query("select * from account where money>?", new KeyedHandler("id"),500);
        System.out.println(map);
    }
    //ColumnListHandler：将结果集中某一列的数据存放到List中。
    @Test
    public void tes7() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        List<Object>list = runner.query("select * from account where money>?", new ColumnListHandler(3),500);
        System.out.println(list);
    }
    //MapListHandler：将结果集中的每一行数据都封装到一个Map里，然后再存放到List
    @Test
    public void tes6() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        List<Map<String, Object>> list = runner.query("select * from account where money>?", new MapListHandler(),500);
        System.out.println(list);
    }
    
    //MapHandler：将结果集中的第一行数据封装到一个Map里，key是列名，value就是对应的值。
    @Test
    public void tes5() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
         Map<String, Object> map = runner.query("select * from account where money>?", new MapHandler(),500);
        System.out.println(map);
    }
    
    //BeanListHandler：将结果集中的每一行数据都封装到一个对应的JavaBean实例中，存放到List里。
    @Test
    public void tes4() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        List<Account>list = runner.query("select * from account where money>?", new BeanListHandler<Account>(Account.class),500);
        System.out.println(list);
    }
    
    //BeanHandler：将结果集中的第一行数据封装到一个对应的JavaBean实例中。
    @Test
    public void tes3() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        Account acc = runner.query("select * from account where money>?", new BeanHandler<Account>(Account.class),500);
        System.out.println(acc);
    }
    //ArrayListHandler：把结果集中的每一行数据都转成一个对象数组，再存放到List中。
    @Test
    public void tes2() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        List<Object[]> list = runner.query("select * from account where money>?", new ArrayListHandler(),500);
        System.out.println(list);
    }
    
    //ArrayHandler:把结果集中的第一行数据转成对象数组。
    @Test
    public void test1() throws SQLException{
        QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
        Object[] objs = runner.query("select * from account where money>?", new ArrayHandler(),500);
        System.out.println(objs);
    }
}