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JDBC-Spring Framework This approach has the additional benefit of making it easy to intentionally implement data access with a mix-and-match approach (i.e. some data access performed using Hibernate, and some using JDBC, others using iBATIS) in a non-intrusive fashion, potentially providing great benefits in terms of continuing to use legacy code or leveraging the strength of each technology.39919
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Spring provides a consistent abstraction for transaction management. This abstraction is one of the most important of Spring's abstractions, and delivers the following benefits:
Provides a consistent programming model across different transaction APIs such as JTA, JDBC, Hibernate, iBATIS Database Layer and JDO.
Provides a simpler, easier to use, API for programmatic transaction management than most of these transaction APIs.
Integrates with the Spring data access abstraction.
Supports Spring declarative transaction management.
Traditionally, J2EE developers have had two choices for transaction management: to use global or local transactions. Global transactions are managed by the application server, using JTA. Local transactions are resource-specific: for example, a transaction associated with a JDBC connection. This choice had profound implications. Global transactions provide the ability to work with multiple transactional resources. (It's worth noting that most applications use a single transaction resource) With local transactions, the application server is not involved in transaction management, and cannot help ensure correctness across multiple resources.
Global transactions have a significant downside. Code needs to use JTA: a cumbersome API to use (partly due to its exception model). Furthermore, a JTA UserTransaction normally needs to be obtained from JNDI: meaning that we need to use both JNDI and JTA to use JTA. Obviously all use of global transactions limits the reusability of application code, as JTA is normally only available in an application server environment.
The preferred way to use global transactions was via EJB CMT (Container Managed Transaction): a form of declarative transaction management (as distinguished from programmatic transaction management). EJB CMT removes the need for transaction-related JNDI lookups--although of course the use of EJB itself necessitates the use of JNDI. It removes most--not all--need to write Java code to control transactions. The significant downside is that CMT is (obviously) tied to JTA and an application server environment; and that it's only available if we choose to implement business logic in EJBs, or at least behind a transactional EJB facade. The negatives around EJB in general are so great that this is not an attractive proposition, when there are alternatives for declarative transaction management.
Local transactions may be easier to use, but also have significant disadvantages: They cannot work across multiple transactional resources, and tend to invade the programming model. For example, code that manages transactions using a JDBC connection cannot run within a global JTA transaction.
Spring resolves these problems. It enables application developers to use a consistent programming model in any environment. You write your code once, and it can benefit from different transaction management strategies in different environments. Spring provides both declarative and programmatic transaction management. Declarative transaction management is preferred by most users, and recommended in most cases.
With programmatic transaction management developers work with the Spring transaction abstraction, which can run over any underlying transaction infrastructure. With the preferred declarative model developers typically write little or no code related to transaction management, and hence don't depend on Spring's or any other transaction API.
B.原文的翻译
JDBC-Spring框架
这种方法的额外的好处是便于mix-and-match以非侵入性的方式实现数据访问(即一些数据访问使用Hibernate，执行和使用JDBC，其他人使用iBATIS)，可能提供极大的好处而言，继续使用遗留代码或利用每种技术的优势。论文网