AbstractJpaCriterionRepository.java 文件源码

@Override
public Page search(QueryCriteria criteria, Pageable pageable) {
    CriteriaBuilder builder = this.entityManager.getCriteriaBuilder();

    CriteriaQuery<Long> countCriteria = builder.createQuery(Long.class);
    Root<T> countRoot = countCriteria.from(this.domainClass);
    long total = this.entityManager.createQuery(
            countCriteria.select(builder.count(countRoot))
                    .where(toPredicates(criteria, countRoot, builder))
    ).getSingleResult();

    CriteriaQuery<T> pageCriteria = builder.createQuery(this.domainClass);
    Root<T> pageRoot = pageCriteria.from(this.domainClass);
    List<T> list = this.entityManager.createQuery(
            pageCriteria.select(pageRoot)
                    .where(toPredicates(criteria, pageRoot, builder))
                    .orderBy(toOrders(pageable.getSort(), pageRoot, builder))
    ).setFirstResult(pageable.getOffset())
            .setMaxResults(pageable.getPageSize())
            .getResultList();

    return new PageImpl<>(new ArrayList<>(list), pageable, total);
}