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JDBC (Java Database Connectivity) is a Java Class library that provides a common way to maintain a connection to a database and lets you access virtually any tabular data source from the Java programming language. It provides cross-DBMS connectivity to a wide range of relational databases and other tabular data sources, such as spreadsheets or flat files. With a JDBC technology-enabled driver, a developer can easily connect all corporate data, even in a heterogeneous environment.
You can use one of the default JDBC drivers to connect to a database, then use SQL to retrieve the data you want to display in a portlet.