不用sql实现,用类似这种方法实现
Long num = taskUserTaskHistoryEditDao.count(new Specification() {
@Override
public Predicate toPredicate(Root root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
List predicateList = new ArrayList<>();
predicateList.add(criteriaBuilder.equal(root.get("taskId"),taskId));
criteriaQuery.where(criteriaBuilder.and(predicateList.toArray(new Predicate[]{})));
return criteriaQuery.getRestriction();
}
});
spring data jpa 怎么查询一个字段的总和?
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