Types of Databases
One of Java's chief strengths is that it enforces object-oriented programming. To get a database to work effectively with Java, we have to start with a database that supports objects or, if it doesn't, we must somehow find a way to bridge that gap, translating between Java's objects and whatever the database considers its basic unit of storage. This problem of bridging the gap between object-oriented Java and non-object-oriented databases is often called the mismatched impedance problem.
Object Databases
Considering that such a thing exists, it might seem that the easiest thing to do is to use a database that supports objects directly. That is probably true. In fact, for a while, there was quite a bit of excitement and optimism ...
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