JPA Entities & Relationships
JPA entities with @Entity, @Id, relationships (@OneToMany, @ManyToOne, @ManyToMany), @JoinColumn, cascade
1Which annotation marks a class as a JPA entity?
Which annotation marks a class as a JPA entity?
คำตอบ
@Entity is the mandatory annotation to declare a class as a JPA entity that will be mapped to a database table. Without this annotation, the EntityManager cannot manage the object's lifecycle. Each entity must also have a unique identifier annotated with @Id to be valid.
2Which annotation defines the primary key of a JPA entity?
Which annotation defines the primary key of a JPA entity?
คำตอบ
@Id identifies the field that will serve as the primary key for the entity. This annotation is mandatory on at least one field of each entity. The primary key guarantees the uniqueness of each record and allows JPA to properly manage merge, refresh, and remove operations.
3Which annotation customizes a column name in the database?
Which annotation customizes a column name in the database?
คำตอบ
@Column allows customizing the mapping between a Java field and a database column, particularly to define the column name, its length, whether it accepts null values, or if it is unique. Without this annotation, JPA uses the Java field name as the default column name.
How to specify a table name different from the class name?
Which @GeneratedValue strategy uses a database sequence?
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