JPA (Java Persistence API) is the dedicated technology for accessing relational databases from inside Jakarta EE. Its aim is to provide a bridge between SQL tables and Java objects. This is a task that is far from simple for other than the most basic data schemes. The reason for this is that in relational database schemes there are associations between different tables: one row from one table may refer to one or many rows from another table or the other way around, and there could be references spanning three or more tables. And think of column-type conversions—a database may have different ...
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