عرض عملي: ربط كيانات Shop وتوقّع SQL الناتج

خطوة بخطوة

1. Add spring-boot-starter-data-jpa and enable SQL logging (spring.jpa.show-sql or the org.hibernate.SQL logger); set ddl-auto=none.
2. Map Category and Product with Money embedded; match columns to the manual schema.sql.
3. Write a create-update-read sequence in a transactional test.
4. Before running, write on screen the SQL you expect for each line.
5. Planned mistake: map an enum without EnumType.STRING; show the number stored, fix it.
6. Run and compare the log with the predictions.