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PostgreSQL™ is an extensible database system. You can add your own functions to the server, which can then be called from queries, or even add your own data types. As these are facilities unique to PostgreSQL™, we support them from Java, with a set of extension APIs. Some features within the core of the standard driver actually use these extensions to implement Large Objects, etc.
To access some of the extensions, you need to use some extra methods in the
org.postgresql.PGConnection class. In this case, you would need to case the
return value of
Driver.getConnection(). For example:
Connection db = Driver.getConnection(url, username, password); // ... // later on Fastpath fp = db.unwrap(org.postgresql.PGConnection.class).getFastpathAPI();