是否可以使用@Formula 注释检索自定义对象？

Question

是否可以检索带有@Formula 注释的自定义对象？我想在我的一个实体中检索特定 table 的代码和描述：

    @Formula(value = "(SELECT s.cod_setor AS code, s.descricao_setor AS description"
            + " FROM service.sector s LEFT JOIN service.employee e "
            + " ON (s.cpf = e.cpf) "
            + " WHERE e.cpf=cpf)")
    private SectorDTO sector;

Answer 1

可以用 @PostLoad 用法来完成。

@Formula(value = "(SELECT concat(s.cod_setor, '_', s.descricao_setor)"
            + " FROM service.sector s LEFT JOIN service.employee e "
            + " ON (s.cpf = e.cpf) "
            + " WHERE e.cpf=cpf)")
// select multiple fields as one string where values are divided by '_'
private String sectorFormula;

@Transient
private SectorDTO sector;

@PostLoad
private void onLoad() {
    String[] parts = sectorFormula.split("_");
    this.sector = new SectorDTO(parts[0], parts[1]);
}

是否可以使用@Formula 注释检索自定义对象？

Is it possible to retrieve a custom Object with @Formula annotation?

hibernate

jpa

spring-data-jpa