How are values for object fields set when using Hibernate?

When using Hibernate, object field values are set through a mapping mechanism between Java objects and database records.

Main ways to set values:

1. Via setters:

   • Hibernate creates entity instances and calls setters to set field values.

2. Via reflection:

   • Hibernate can directly set field values through reflection, even if setters are absent (depends on configuration).

3. When loading from the database:

   • Hibernate executes SQL queries, retrieves data, and maps it to entity fields.

4. When saving:

   • Object field values are read and transformed into SQL queries for insertion or update.

Example:

@Entity
public class User {
    @Id
    private Long id;

    private String name;

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

When loading from the database, Hibernate will create a User object and call setName with the value retrieved from the database.

Thus, setting values occurs automatically through the ORM mechanism, using either setters or direct access to fields.