Java Data Objects

Java Data Objects

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Java Data Objects (JDO) is a specification of Java object persistence. Object persistence is a mechanism for storing the objects data in some permanent medium, such as a database, and bringing it back at some later time. It is a technology that lets you save and retrieve objects to and from a database without having to deal with tables and SQL directly.

JDO is a standard developed under the auspices of the Java Community Process. One of the main objectives of JDO is to provide a simple, easy-to-use interface for storing and retrieving objects. JDO lets you view a database as a collection of objects rather than as a collection of tables.

With JDO, you can store any object, whether it’s an instance of a class you’ve written or an instance of a Java platform class like java.util.HashMap or java.awt.Color. It automatically takes care of saving the state of an object and restoring it later.

The JDO technology also provides a way to perform transactions, which are atomic units of work. It also allows for the querying of data, which can be done in a way that is independent of the underlying datastore.

It’s important to note that JDO is a specification, not an implementation. There are several vendors who provide JDO implementations, and while they all conform to the same standard, they might offer different advanced features.

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