There are JDBC samples included with the Pervasive PSQL SDK. Please see the SAMPLES directory under your Pervasive PSQL SDK installation directory. If you installed to the default location, this would be file_path\PSQL\SDK\SAMPLES\JDBC.

For default locations of Pervasive PSQL files, see Where are the Pervasive PSQL files installed? in Getting Started With Pervasive PSQL.