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Apache
Cayenne
是一個強大而易於掌握的Java ORM框架。Cayenne
提供了
Java
對象到關係型數據庫的持久化映射管理，單方法調用查詢和更新（包括細粒度的更新所有被修改的對象），無縫隙的把多種數據庫集成到單一虛擬數據源中。Cayenne
由
CayenneModeler 分發──完整的
GUI 映射工具。Cayenne
已被成功部署在高負載的生產環境中。
在吸取了廣大用戶的建議的基礎上發布了
3.0
版本。這個版本中最重要的新特性是“遠程對象持久化(Remote
Object Persistence)”，就是把
Cayenne
轉變成一個獨立的數據伺服器，以便遠程應用能訪問。目前，僅僅用於
Java 客戶端程式（常常用於
Swing 或
SWT“富客戶端”應用），但開發者計畫將客戶端用其他語言來實現。ORM-到-WS
把熟悉的
ORM
世界提供給遠程客戶端。即關係的延遲粒度、本地緩存、數據請求、單方法調用多對象的提交、等等。也就是伺服器和客戶端層共享同樣的抽象對象模型和相同的
Cayenne API。
Apache Cayenne is an open source persistence framework licensed under the Apache
License, providing object-relational mapping (ORM) and
remoting services. With a wealth of unique and
powerful features, Cayenne can address a wide range of persistence needs.
Cayenne seamlessly binds one or more database schemas directly to Java objects,
managing atomic commit and rollbacks, SQL generation, joins, sequences, and
more. With Cayenne's Remote Object Persistence, those Java objects can even be
persisted out to clients via Web Services. Or, with native XML serialization,
objects can be even further persisted to non-Java clients - such as an
Ajax-capable browser.
Cayenne is designed to be easy to use, without sacrificing flexibility or
design. To that end, Cayenne supports database reverse engineering and
generation, as well as a Velocity-based class generation engine. All of these
functions can be controlled directly through the CayenneModeler, a fully
functional GUI tool. No cryptic XML or annotation based configuration is
required! An entire database schema can be mapped directly to Java objects
within minutes, all from the comfort of the GUI-based CayenneModeler.
Cayenne supports numerous other features, including caching, a complete object
query syntax, relationship pre-fetching, on-demand object and relationship
faulting, object inheritance, database auto-detection, and generic persisted
objects. Most importantly, Cayenne can scale up or down to virtually any project
size. With a mature, 100% open source framework, an energetic user community,
and a track record of solid performance in high-volume environments, Cayenne is
an exceptional choice for persistence services.
Cayenne team is in the process of building a spec-compliant
open source JPA Provider.
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