Explain what O/R (object-relational) mapping is and how it works. 2. What is JPA? Explain the purpose of JPA annotations. 3. Discuss pros and cons of JPA in your own words. 4. how database connection pool is used to work with a database. 5. how JDBC is used to work with a database.

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ObjectRelational Mapping OR Mapping ObjectRelational Mapping is a programming technique used in software development to bridge the gap between objectoriented programming languages like Java Python or ... View the full answer