JDBC_apache_commons_DBUtils详解

package cn.commons.DBUtils;

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

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

import cn.code.dbUtils.Stu;
import cn.code.jdbc.JDBCUtils2;

public class Demo1 {
    @Test
    public void fun1() throws Exception{
        QueryRunner qr = new QueryRunner();
            String sql="insert into stu values(?,?,?,?)";
            Object[]params ={"dbUtils","java",23,"boy"};
            Connection conn = qr.getDataSource().getConnection();
            qr.update(conn, sql, params);
        }
    @Test
    public void fun2() throws SQLException{
        QueryRunner qr = new QueryRunner(JDBCUtils2.getDataSource());
        String sql="select * from stu";
        //BeanListHandler多行结果集处理器，每行对应一个Stu对象
        List<Stu> stus = qr.query(sql, new BeanListHandler<Stu>(Stu.class));
        for(Stu s : stus ){
            System.out.println(s);
        }
    }
    @Test
    public void fun3() throws SQLException{
        /*
         * MapHandler
         * */
        QueryRunner qr = new QueryRunner(JDBCUtils2.getDataSource());
        String sql="select * from stu where number=?";
        //BeanListHandler多行结果集处理器，每行对应一个Stu对象
        Object[]params ={"0001"};
        Connection conn = qr.getDataSource().getConnection();
        Map stu = qr.query(conn, sql, new MapHandler(), params);
        System.out.println(stu);
    }
    @Test
    public void fun4() throws SQLException{
        QueryRunner qr = new QueryRunner(JDBCUtils2.getDataSource());
        String sql="select * from stu ";
        //BeanListHandler多行结果集处理器，每行对应一个Stu对象
        //Object[]params ={"0001"};
        Connection conn = qr.getDataSource().getConnection();
        List<Map<String,Object>> stu = qr.query(conn, sql, new MapListHandler());
        System.out.println(stu);
    }
    @Test
    public void fun5() throws SQLException{
        QueryRunner qr = new QueryRunner(JDBCUtils2.getDataSource());
        String sql="select count(*) from stu ";
        //BeanListHandler多行结果集处理器，每行对应一个Stu对象
        //Object[]params ={"0001"};
        Connection conn = qr.getDataSource().getConnection();
        //count(*)返回值用Number，接收最为合适
        Number stu = (Number)qr.query(conn, sql, new ScalarHandler());
        System.out.println(stu);
    }
    @Test
    public void fun6() throws SQLException{
        QueryRunner qr = new QueryRunner(JDBCUtils2.getDataSource());
        String sql="select * from stu where number=?";
        //BeanListHandler多行结果集处理器，每行对应一个Stu对象
        Object[]params ={"0001"};
        Connection conn = qr.getDataSource().getConnection();
        Stu stu = qr.query(conn, sql, new BeanHandler<Stu>(Stu.class), params);
        System.out.println(stu);
    }
        
}

//注意所有jdbc代码，均导入数据库连接池包，数据库连接包，自制JDBCUtils.jar等