The 'impedance mismatch' between relational databases' tabular orientation and object-oriented Java's hierarchical one is a perennial problem for which the Java world has several good solution offerings. The third in a three-part series, this article examines the ways that JDO attempts to simplify the chore of connecting relational databases and the Java programming language.
by Jeff Hanson
January 5, 2005
toring and retrieving information for most applications usually involves some form of interaction with a relational database. This has presented a fundamental problem for developers for quite some time since the design of relational data and object-oriented instances share very different relationship structures within their respective environments. Relational databases are structured in a tabular configuration and object-oriented instances are typically structured in a hierarchical manner. This "impedance mismatch" has led to the development of several different object-persistence technologies attempting to bridge the gap between the relational world and the object-oriented world. The Java Data Objects (JDO) API provides yet another means for bridging this gap.
This article is the second in a series discussing how three different object-persistence technologies (EJB, Java Data Objects, and Hibernate) attempt to simplify the chore of connecting relational databases and the Java programming language.
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toring and retrieving information for most applications usually involves some form of interaction with a relational database. This has presented a fundamental problem for developers for quite some time since the design of relational data and object-oriented instances share very different relationship structures within their respective environments. Relational databases are structured in a tabular configuration and object-oriented instances are typically structured in a hierarchical manner. This "impedance mismatch" has led to the development of several different object-persistence technologies attempting to bridge the gap between the relational world and the object-oriented world. The Java Data Objects (JDO) API provides yet another means for bridging this gap.
