=====================TODO List======================
* Sql query result list map to Object tree (oneToOne, oneToMany, manyToMany, tree)

* L1 Cache (similar but not exact as Hibernate's L1 cache, does not cache save/update/delete command, only cache entities)

* L2 cache (use Hibernate's Ecache,  or Redis)

* Query Cache (similar lie Hibernate's Query cache)

* nullable, insertable, updatable need implemented in Box's insert update methods

* .cacheLoad()  .cacheQuery()  forceInsert(), forceUpdate()  method to used L2 Cache 

* .cacheCompare() to check if database has been changed.

* .cacheClear() to clear L2 cache

* .BatchCacheSave   .BatchCacheUpdate()   .BatchCacheExecute to Entity batch operate (similar like jdbc batch methods)
  
* Blob, Clob type?(or just use JDBCTemplate)

* add MS SQL SERVER 

* Divided or config to 2 different type, one support container PO manager, another not, but both support 1st, 2nd cache.

* For exception, delete class name, add error code, do not directly show entity in error message


===========Finished tasks===========
base class delete dao & clean up
deleted proxyBean class because no need use it