Read e-book online Java Data Objects PDF

By Robin M. Roos

ISBN-10: 0321123808

ISBN-13: 9780321123800

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

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Extra resources for Java Data Objects

Sample text

Com) and I hope you will find it useful in your own JDO-based projects. 3 Transactions We deal with JDO transactions in detail in Chapter 7, but for now you need to know that a single persistence manager has, at most, one active transaction. As such there is only ever one Transaction object associated with a given persistence manager. It is necessary for the developer to perform begin() and commit() method invocations against this Transaction object. Applications requiring multiple simultaneous independent transactions must obtain a corresponding number of persistence managers from the factory.

However, we have already used two others, namely Transaction and Extent. These standard interfaces, although a comprehensive description of persistence functionality, are not in themselves sufficient to actually implement persistence. What is needed is a set of concrete classes implementing the respective interface definitions, which will undertake persistence operations when invoked to do so. A set of such classes is known as a JDO implementation. JDO implementations are data store-specific. Some work against any JDBCcompliant database.

JDO implementations are data store-specific. Some work against any JDBCcompliant database. Others may work with only a specific relational database in order to exploit potential optimizations. 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.

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