本文介绍了SessionFactory作为线程安全且不可变的缓存，用于单一数据库的映射编译，并负责创建Session实例。Session则代表了应用程序与持久化存储之间的会话，是短生命周期的单线程对象，用于封装JDBC连接并持有第一级缓存。
[b]SessionFactory [/b](org.hibernate.SessionFactory)
A threadsafe (immutable) cache of compiled mappings for a single database. A factory for Session and a client of ConnectionProvider. Might hold an optional (second-level) cache of data that is reusable between transactions, at a process- or cluster-level.
[b]Session[/b] (org.hibernate.Session)
A single-threaded, short-lived object representing a conversation between the application and the persistent store. Wraps a JDBC connection. Factory for Transaction. Holds a mandatory (first-level) cache of persistent objects, used when navigating the object graph or looking up objects by identifier.
A threadsafe (immutable) cache of compiled mappings for a single database. A factory for Session and a client of ConnectionProvider. Might hold an optional (second-level) cache of data that is reusable between transactions, at a process- or cluster-level.
[b]Session[/b] (org.hibernate.Session)
A single-threaded, short-lived object representing a conversation between the application and the persistent store. Wraps a JDBC connection. Factory for Transaction. Holds a mandatory (first-level) cache of persistent objects, used when navigating the object graph or looking up objects by identifier.
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