1. Databases, JDBC drivers and connection URLs
  2. I've used the combinations shown in the table below:

    RDBMS Driver Typical JAR name Typical Connection URL
    PostgreSQL 9.x org.postgresql.Driver postgresql-9.1-901-1.jdbc4.jar jdbc:postgresql://localhost:5432/RegTAP
    Sybase ASE 15.7 net.sourceforge.jtds.jdbc.Driver jtds-1.3.1.jar jdbc:jtds:sybase://
    Sybase ASE 15.7 com.sybase.jdbc4.jdbc.SybDriver jconn4.jar jdbc:sybase:Tds:

    As far as Sybase is concerned:

    Regarding the possibility of using two different drivers for Sybase you may also refer to my axafusers-connectivity project for some performance tests. According to these tests it appears that the jTDS driver is more performant than the jConnect4.