自动获取SQL查询中的待用列（Hibernate/Mybatis/自制）？ - 创建图书馆的想法

Question

We know we should not write SELECT * ; instead, should write down the columns that will indeed be used in the business logic _{(eg SELECT blog_title, blog_content in one query about the full article, and SELECT blog_title in another logic that only cares about titles)} .

However, in MyBatis or Hibernate, IMHO I have to write down those columns manually... This seems really a waste of time ...

I wonder whether there is a way to make our lives easier? More specifically:

1. Is there any automatic way in Mybatis/Hibernate to do so?
2. If no, will my following naive idea works? (If so I am willing to create an open-source library.)

Two naive ideas (with Mybatis):

a. Statically analyze the Java syntax tree, and see who uses which columns.

b. Dynamically run the code once and get enough information about which columns will be used (maybe through a dynamic proxy like cglib).

Or, we will have to manually write down those columns by ourselves, without any good aids?? :(

Thanks!

Answer 1

Static analysis is pretty hard if your access is dynamic or in non-java files and analyzing performance problems is going to be very hard this way as well. Take a look at whatBlaze-Persistence Entity-View has to offer which is almost what you want!