The main purpose of entity EJB components is to remotely access persisted data, mostly stored in a relational database.
实体e JB组件的主要目的是远程访问持续数据，这些数据主要存储在关系数据库中。
Even within a single database, the quality of persisted data is not necessarily better if the appropriate rules are not enforced.
即使在单个数据库内，如果未执行相应的规则，所保存的数据的质量并不一定更好。
The transaction support in JDBC 2 gave developers control over concurrent access to their data, thereby ensuring that persisted data is always in a consistent state.
JDBC 2中的事务支持让开发人员可以控制对数据的并发访问，从而保证持续数据总是保持一致的状态。
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