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improve till lesson 21
- DONE use new version of springboot and optimize pom.xml
- DONE improve OrgRepository like EmpRepository (use ChangeStatus and dao)
- DONE extract EntityPersister(Mapper now)
- DONE improve other repositories to use Mapper
- make builder version (builder for both )
- fix optimize lock
- introduce mybatis (or mybatis plus?)
- make assembler version
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Introduce JPA