Download e-book for kindle: Java Data Objects by Robin M. Roos

By Robin M. Roos

The 1st ebook to introduce JDO, an enhancement for databases with advancements in software portability, functionality and reliability. whole insurance of JDOQL, a brand new question language. CD-ROM incorporated.

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First of all, I show below the primary key class BusinessPartnerPK. I have chosen to put the primary key classes into a pk subpackage. partnerNumber = arg; } public BusinessPartnerPK() { } public String toString() { return partnerNumber; } } 8455 Chapter 3 p21-32 29/7/02 3:42 pm Page 31 JDO identity It is possible for an enhancer tool to generate Object ID classes when the developer has not already written these. I perceive this as a good approach and very rarely hand-write such classes. However, developers should be aware that applications tend to have compile-time dependencies on the primary key classes, and so the enhancement phase must have occurred prior to compiling the application classes.

The following optional states, however, are defined in support of various optional features of the specification. Only those JDO vendors providing support for the associated feature will implement these states. 1 Persistent-Nontransactional This state is used in the implementation of optimistic transaction management. It is applied to JDO instances that represent specific persistent data in the data store, whose field values are currently loaded but are not necessarily transactionally consistent.

Still others work with certain object databases, file system formats, or provide integration to specific enterprise applications. In some cases a spread of implementations for different data stores may be grouped together under a single product name. A company that markets a JDO implementation is known as a JDO vendor. A selection of commercial and non-commercial JDO vendors and their JDO implementations is given in Chapter 12. com. com. Most JDO implementations are shipped with an enhancement tool.

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