如何在Hibernate中的条件中访问Object.field

Question

我已经写了公司课的标准。 以下是公司类，companySearch类和标准。但是标准列表是抛出异常。异常是“org.hibernate.QueryException：无法解析属性：san.san of：com.sesami.common.domain.Company”。如何访问Company.san.san？

公司类

public class Company extends DomainObject implements UserDetails {
private Long id;
private String companyName;
private CompanyType companyType;
private String description;
private String companyURL;
private String billToEmail;
private String hashPassword;
private SAN san;

@OneToOne(cascade = { CascadeType.ALL })
public SAN getSan() {
    return san;
}

public void setSan(SAN san) {
    this.san = san;
}
...
}

CompanySearch

public class CompanySearch {
private String companyName;
private String email;
private Long san;
private String gstNumber;
......
public Long getSan() {
    return san;
}

public void setSan(Long san) {
    this.san = san;
}
...
}

标准

companyCriteria = this.getSession().createCriteria(
            Company.class);

    if (companySearch.getSan() != null
            && !"".equals(companySearch.getSan()))
        companyCriteria.add(Restrictions.eq("san.san",
                companySearch.getSan()));

    Integer count = ((Long) companyCriteria.setProjection(
            Projections.rowCount()).uniqueResult()).intValue();
    companyCriteria.setProjection(null);
    companyCriteria.setResultTransformer(Criteria.ROOT_ENTITY);
    companyCriteria
            .setFirstResult((pager.getPage() - 1) * pager.getPageSize())
            .setMaxResults(pager.getPageSize()).list();
    List<Company> companies = companyCriteria.list();

    PagedResultSet pr = new PagedResultSet();
    pr.setPager(pager);
    pr.setResultSet(companies);
    pr.setRowCount(count);
    return pr;

Answer 1

您必须使用子标准或别名创建San实体的连接：

companyCriteria.createAlias("san", "sanAlias"); 
companyCriteria.add(Restrictions.eq("sanAlias.san",
                    companySearch.getSan()));

或

companyCriteria.createCriteria("san").add(Restrictions.eq("san",
                                          companySearch.getSan()));

Hibernate reference documentation甚至Criteria javadoc中都对此进行了详细解释。

请注意，这与Spring完全无关，而且与Hibernate有关。如果您在Spring doc中搜索了如何执行此操作，难怪您没有找到任何内容。