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Java DB

                         

Java DB is an open source Apache Derby database supported by Sun. Java DB is completely written in the Java programming language having the functionality write once run everywhere. It is easy to use, having fully featured set, small footprint and standards compliance that make it ideal database for Java developers. It can be embedded into any Java applications without any administration required by the developer. It is also useful for client server mode.
                         
Java Data Objects (JDO)
                       
The Java Data Objects (JDO) API is a Java model abstraction for persistence based on standard interfaces. JDO technology can be used directly to store Java domain model instances into the persistent store (database). Application developed by using JDO are portable, database independence, high performance, and optional integration with Enterprise Java Beans (EJB). 
                            
The Java Database Connectivity (JDBC)

The Java Database Connectivity (JDBC) API is provides database-independent connectivity between the Java programming language with the wide range of databases such as SQL and other tabular data sources, such as spreadsheets or flat files. JDBC also provides the concept of write once run anywhere.

                         

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