the connection information are with the ORDS configuration directory and not Weblogic. i.e. wherever your java -jar ords.war configdir .... is.
Look for the file ords/defaults.xml and there is the DB setup config.
if ords is deployed in java container on weblogic the command configdir must executed with a war located in stage folder.
also we have to restart the container for the change effect and ords restart the pool.