摘要：Hibernate provides a dual-layer caching system with a first-level object cache(the Session) and a pluggable second-level data cache. The first-level cache isalways active—it’s used to reso... 阅读全文

摘要：In Hibernate, objects instantiated using the new operator aren’t immediately persistent.Their state is transient, which means they aren’t associated with any databasetable row, and so thei... 阅读全文

摘要：Along with Java identity (memory location) and object equality, we pickup database identity (location in the persistent data store). We now have three methodsfor identifying objects:　　■ Object i... 阅读全文

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摘要：Data Accessor Object(DAO) = Data + Accessor + Object 阅读全文

摘要：Mapping class inheritanceA simple strategy for mapping classes to database tables might be “one table for every class.” This approachsounds simple, and it works well until you encounter in... 阅读全文

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