JDBC version

I am confuse about jdbc versions. Now currently we have jdbc 4.0. we study jdbc in java EE. But the API is SE.

I read that java1.4 supports jdbc2.0,2.1 and jdbc 3.0 but optional jdbc2.1

how do i change optional 2.0 version JDBC 3

One thing that java 5 features tell us that java 5 supports jdbc2.0

Could any body clarify this issue.

[364 byte] By [lincolnrosea] at [2007-11-27 6:43:17]