By Sameer Tyagi, Michael Vorburger, Keiron McCammon, Heiko Bobzin
Center Java info gadgets can provide: * functional examples displaying how JDO might be utilized to latest functions * robust insights for utilizing JDO to architect new platforms extra successfully * step by step suggestions for integrating JDO with different J2EE applied sciences * top practices for utilizing JDO in real-world company environments
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However, SQL is not well suited to express filtering expressions on object graphs. Most O/R mapping tools thus have some form of non-SQL query facility. Queries are then translated into SQL before being sent to the database for execution. This facility generally comes either in the flavor of another string-based query language that mapping tools parse or directly as some sort of tree of Criteria, Operation, and other objects. While again simple cases are easy to translate, the more advanced scenarios can rapidly get fairly interesting exercises.
Figure 2-1 shows a Java class Author that has a countryCode and name field. This information can be put into an AUTHORS table that has corresponding COUNTRY and NAME columns: 32 Part 1: Introduction Part 1: Introduction 33 Figure 2-1. The object versus the relational view of the world. Instances of the Author class are plain Java objects that contain the countryCode and name data during runtime. The instance data corresponds to table rows, which are accessed by SQL (Structured Query Language) queries and INSERT, UPDATE, or DELETE operations.
In fact, JDO is somewhat better than this, because with JDBC an application is still prone to differences in SQL support across different databases. With JDO, SQL is not directly exposed. Although a JDO runtime may itself use JDBC to access a relational database as its datastore, it is the responsibility of the JDO implementation to resolve the differences in SQL support across databases. Even better, unlike SQL, a JDO application can work "as is" across different types of databases, not just relational: object databases, flat-files, and so on.
Core Java Data Objects by Sameer Tyagi, Michael Vorburger, Keiron McCammon, Heiko Bobzin