Package io.github.joselion.springr2dbcrelationships.annotations

Annotation Interface ManyToOne

@Documented
@Value("null")
@Retention(RUNTIME)
@Target({FIELD,PARAMETER,ANNOTATION_TYPE})
public @interface ManyToOne

Marks a field to have a many-to-one relationship.

This annotation also adds the @Transient and @Value("null") annotations to the field.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
String	foreignKey	Specifies the name of the "foreign key" column in the current entity's table.
boolean	persist	Whether the associated entity persists or not.

Element Details

foreignKey

String foreignKey

Specifies the name of the "foreign key" column in the current entity's table. This is optional because the annotation can infer the "foreign key" column name in two different ways:

1. The column's name matches the parent table's name followed by an _id suffix.

2. The column's name matches the name of the annotated field followed by an _id suffix.

For example, given a parent table country, a child table city, and the annotated field @OneToMany Country originCountry;. The "foreign key" column of the city table will be inferred as either country_id using option (1) or as origin_country_id using option (2).

Returns:

the "foreign key" column name

Default:

""

persist

boolean persist

Whether the associated entity persists or not. Defaults to false.

Many-to-one relationships are a backreference of a one-to-many relationship. They are usually expected to be link-only, meaning the parent should exist to link the entity through their foreignKey(), and no changes are made to the parent entity. Setting this option to true creates/updates the parent before linking the entity.

Returns:

true if the associated entity persists, false otherwise

Default:

false