MyBatis框架实现一个简单的数据查询操作

public class Goods{
   private Integer goodsId;//商品编号
   private String title;//标题
   private String subTitle;//子标题
   private Float originalCost;//原始价格
   private Float currentPrice;//当前价格
   private Float discount;//折扣率
   private Integer isFreeDelivery;//是否包邮，1-包邮 0-不包邮
   private Integer categoryId;//分类编号
}

public Integer getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(Integer goodsId) {
        this.goodsId = goodsId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getSubTitle() {
        return subTitle;
    }

    public void setSubTitle(String subTitle) {
        this.subTitle = subTitle;
    }

    public Float getOriginalCost() {
        return originalCost;
    }

    public void setOriginalCost(Float originalCost) {
        this.originalCost = originalCost;
    }

    public Float getCurrentPrice() {
        return currentPrice;
    }

    public void setCurrentPrice(Float currentPrice) {
        this.currentPrice = currentPrice;
    }

    public Float getDiscount() {
        return discount;
    }

    public void setDiscount(Float discount) {
        this.discount = discount;
    }

    public Integer getIsFreeDelivery() {
        return isFreeDelivery;
    }

    public void setIsFreeDelivery(Integer isFreeDelivery) {
        this.isFreeDelivery = isFreeDelivery;
    }

    public Integer getCategoryId() {
        return categoryId;
    }

    public void setCategoryId(Integer categoryId) {
        this.categoryId = categoryId;
    }
}

//xml标准声明部分
<?xml version="1.0" encoding ="UTF-8"?>

//Mybatis的DTD部分
<!DOCTYPE mapper
       PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

//MyBatis映射部分   namespace:命名空间
<mapper namespace="goods">
    <select id="selectAll" resultType="com.mybatis.entity.Goods">
       select * from t_goods order by goods_id desc limit 10
       //按照商品编号从大到小倒序排列，并且将结果的前十条提取出来 
    </select>
</mapper>

//resultType="com.mybatis.entity.Goods"指定了该查询操作执行后返回结果的类型，这里将返回的结果映射成com.mybatis.entity.Goods类型的对象

<mappers>
     <mapper resource="mappers/goods.xml"/>
</mappers>

<settings>
   <!--goods_id ==> goodsId 驼峰命名转换 -->
   <setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>

@Test
public void testSelectAll(){
   SqlSession session = null;
   try{
       session = MyBatisUtils.openSession();
       List<Goods> List = session.selectList("goods.selectALL");
       //打印表结果
       for(Goods  g: list){
           System.out.printin(g.getTitle());
   }
   }catch(Exception e){
       throw e;
   }finally{
        MyBatisUtils.closeSession(session);
   }
  

}