jpa - Java persistence api don't want to create entities -

jpa - Java persistence api don't want to create entities -

is there way utilize jpa insert, update, delete , select not alter tables? have made reverse engineering science , made java classes database tables... in class have @entity , @id annotations, don't need create entities or fields in database. have finished database schema , there db admin responsible tables , fields. there way this?

i think mean don't want create/modify table... turn off ddl schema generation in persistence.xml

java jpa