What difficulties arise when integrating objects into a relational database?

The following difficulties arise when integrating objects into a relational database:

• Impedance Mismatch: objects in OOP have complex structures, inheritance, and relationships, while relational databases store data in tables with fixed types and relationships through keys.
• Complexity of mapping relationships: one-to-many and many-to-many relationships require creating additional tables and complex queries.
• Inheritance issues: relational databases do not support inheritance directly, so patterns are used (table per class, table per hierarchy, etc.).
• Transaction and object state management: it is necessary to synchronize the state of objects in memory with the data in the database.
• Performance: frequent conversions of objects to relational records and vice versa can reduce performance.

To address these problems, ORM (Object-Relational Mapping) frameworks are often used, which automate the conversion between objects and tables.