[Mybatis] 注解操作

• 查询数据库返回时，将数据库字段与实体类属性进行对应（主要用于多表关联）

@Select("select * from order")
    @Results({
            @Result(id=true,property = "id",column = "id"),   // 设置主键, property = "实体类属性名", column = "数据字段名"
            @Result(property = "orderNum", column = "orderNum"),
            @Result(property = "product", column = "productId", javaType = Product.class, one = @One(select = "dao包名.IProductDao.findById")) 
    })
    public List<Orders> findAll() throws Exception;