Save a parent and its child entities with one persist() call in Hibernate 7. See cascade PERSIST and MERGE, the helper method that sets both sides, managed and detached parents, getReference(), and the real SQL and errors.
A JPA cascade type repeats persist, merge, remove, refresh or detach from a parent entity to its children. See what each CascadeType does in Hibernate 7, the SQL it runs, what goes wrong without it, and which one to pick.
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