I thougt I could use Data sink for a small change in my Database before executing a test step, so I tryed 'JDBC' connect.
Maybe I should better use a groovy skript, but anyway...

Driver: oracle.jdbc.driver.OracleDriver
Connection String: jdbc:oracle:thin:@127.0.0.1:1521:TEST
doesn't work.
(Error: java.sql.SQLException: Invalid arguments in call)
How can I set username and password for this connection?

Works perfect.
Many thanks!