Question

目前，我们的查询会添加各种限制，以确保结果被视为有效或有效。这些限制用于多个地方/查询，因此设置方法类似于

 public Criteria addStandardCriteria(Criteria criteria, ...) {
      // Add restrictions, create aliases based on parameters
      //     and other non-trivial logic
     criteria.add(...);
     return criteria;
 }

到目前为止，此工作正常，但现在需要使用DetachedCriteria将此标准条件添加到子查询中。有没有办法修改此方法以接受Criteria或DetachedCriteria或更好的方法来添加限制？

Answer 1

我最终重写了查询，所以这不再是一个问题，但在此之前我创建了这个似乎有用的课程，但你的里程可能会有所不同：

 public class CriteriaContainer implements Serializable {

    private static final long serialVersionUID = 1L;

    private Criteria criteria = null;
    private DetachedCriteria detachedCriteria = null;

    public CriteriaContainer(Criteria criteria) {
        this.criteria = criteria;
        this.detachedCriteria = null;
    }

    public CriteriaContainer(DetachedCriteria detachedCriteria) {
        this.detachedCriteria = detachedCriteria;
        this.criteria = null;
    }

    /**
     * @param eq
     * @return 
     */
    public CriteriaContainer add(final Criterion eq) {
        if (criteria != null) {
            criteria.add(eq);
        } else if (detachedCriteria != null) {
            detachedCriteria.add(eq);
        }
        return this;
    }

    /**
     * @return the criteria
     */
    public Criteria getCriteria() {
        return criteria;
    }

    /**
     * @return the detachedCriteria
     */
    public DetachedCriteria getDetachedCriteria() {
        return detachedCriteria;
    }

    /**
     * @param associationPath
     * @param alias
     * @return 
     */
    public CriteriaContainer createAlias(final String associationPath, final String alias) {
        if (criteria != null) {
            criteria.createAlias(associationPath, alias);
        } else if (detachedCriteria != null) {
            detachedCriteria.createAlias(associationPath, alias);
        }
        return this;
    }

    /**
     * @param distinctRootEntity
     * @return 
     */
    public CriteriaContainer setResultTransformer(final ResultTransformer transformer) {
        if (criteria != null) {
            criteria.setResultTransformer(transformer);
        } else if (detachedCriteria != null) {
            detachedCriteria.setResultTransformer(transformer);
        }
        return this;
    }
}

criteria = addBasicCriteria(new CriteriaContainer(criteria), ...).getCriteria()
detachedCriteria = addBasicCriteria(new CriteriaContainer(detachedCriteria), ...).getDetachedCriteria()

Hibernate Criteria：为Criteria和DetachedCriteria添加限制

1 个答案: