Hibernate ORM 5.2.18.Final User Guide
https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#pc
Chapter 3. Persistence Contexts
https://docs.jboss.org/hibernate/orm/4.0/devguide/en-US/html/ch03.html
Chapter 3. Persistence Contexts
https://docs.jboss.org/hibernate/core/4.3/devguide/en-US/html/ch03.html
Hibernate ORM 5.2.18.Final User Guide
https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#pc
Hibernate transient , persistent, detached - wblade - 博客园
http://www.cnblogs.com/wblade/articles/1906711.html
深入hibernate的三种状态 - xiaoluo501395377 - 博客园
http://www.cnblogs.com/xiaoluo501395377/p/3380270.html
Hibernate的evict方法和clear方法的区别 - izumi - 博客园
http://www.cnblogs.com/mabaishui/archive/2009/10/15/1584190.html
Manning | Java Persistence with Hibernate
https://www.manning.com/books/java-persistence-with-hibernate
Hibernate 对象状态 - Hibernate教程 - 一点教程
http://www.yiidian.com/hibernate/hibernate-object-status.html
Transient, Persistent and Detached Objects in Hibernate - Dinesh on Java
https://www.dineshonjava.com/hibernate/transient-persistent-and-detached/
hibernate transient, persistent, detached objects differences and uses
https://www.experts-exchange.com/questions/28032440/hibernate-transient-persistent-detached-objects-differences-and-uses.html
java - What are detached, persistent and transient objects in hibernate? - Stack Overflow
https://stackoverflow.com/questions/2573739/what-are-detached-persistent-and-transient-objects-in-hibernate