mybatis mapper association collection

1.Question Description:

sometimes, POJO bean contains another bean or collection as property,

it's suitable for select data from more than one table.

2. Solution:

　　2.1 mybatis mapper file , for example:

.....

<select >
   select
   a.*, b.detail_descript,
   c.image_url,
   c.product_id,
   c.property_id,
   c.value_id,
   d.value_name
   FROM
   syl_products a,
   syl_products_ext b,
   syl_products_preview_images c,
     syl_property_values d
   where a.product_id = b.product_id
      and a.product_id = c.product_id
      and c.value_id = d.value_id
      and a.product_id = #{productId}
</select>
</mapper>

　　2.2 POJO bean , for example:

public class Products {

   private String idStr;

   private Long productId;

    private String productName;

    ............

    //add field for sql
    private ProductsExt prodExt;


    //add field for sql
    List<ProductsPreviewImages> prodPropImgList;

    //add field for sql
    private List<ProductPropertyEntity> baseProdPropList;

//getter and setter method

....

}