spring JPA 查询-分页方法以及模糊查询的一些记录
1：简单的分页查询
Sort sorts =new Sort( Sort.Direction.DESC, "createTime");
Sort sorts =new Sort( Sort.Direction.DESC, "createTime");
Pageable pageable = PageRequest.of(pageNum -1, pageSize, sorts);
Page pages=merchantOrderRepository.findAll((Specification) (root, query, cb) -> {
List list =new ArrayList<>();
if (null !=serviceType) {
Expression exp = root.get("serviceType");
List serviceTypeList =new ArrayList<>();
if(serviceType ==1){
serviceTypeList.add("0");
serviceTypeList.add("1");
}else if(serviceType ==2){
serviceTypeList.add("2");
}
list.add(exp.in(serviceTypeList));
}
if (null !=orderStatus) {
list.add(cb.equal(root.get("status"), orderStatus));
}
if (!ObjectUtils.isEmpty(technician.getId())) {
list.add(cb.equal(root.get("technicianId"), technician.getId()));
}
Predicate[] p =new Predicate[list.size()];
return cb.and(list.toArray(p));
}, pageable);
2:自带模糊查询
Sort sorts =new Sort(Sort.Direction.DESC, "createTime");
PageRequest pageRequest =new PageRequest(page -1, pageSize, sorts);
//分页查询
Page merchants =merchantReposotory.findAll(new Specification() {
@Override
public PredicatetoPredicate(Root root, CriteriaQuery criteriaQuery, CriteriaBuilder cb) {
Predicate predicate = cb.conjunction();
if (merchant !=null){
if (!StringUtils.isEmpty(merchant.getName())){
predicate.getExpressions().add(cb.like(root.get("name"),"%"+merchant.getName()+"%"));
}
if (null !=merchant.getStatus()) {
predicate.getExpressions().add(cb.equal(root.get("status"), merchant.getStatus()));
}
if (null !=merchant.getBusinessStatus()) {
predicate.getExpressions().add((cb.equal(root.get("businessStatus"), merchant.getBusinessStatus())));
}
if (!StringUtils.isEmpty(merchant.getProvinceId())) {
predicate.getExpressions().add((cb.equal(root.get("provinceId"), merchant.getProvinceId())));
}
if (!StringUtils.isEmpty(merchant.getCityId())) {
predicate.getExpressions().add(cb.equal(root.get("cityId"), merchant.getCityId()));
}
}
return predicate;
}
}, pageRequest);
