Inheritance spring-data-jpa query conditions to achieve the paSpecificationExecutor

dao:

 

package com.tensquare.base.dao;
import com.tensquare.base.pojo.Lable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
public interface LableDao extends JpaRepository<Lable,String>, JpaSpecificationExecutor<Lable> {

}

 

 

 

service：

 

/ ** 
* Dynamic Conditions extracted in order to facilitate single method invocation 
* @param 
* @return 
* /
 Private Specification <the Lable> createSpecification (the Lable Lable) {

    return new new Specification <the Lable> () {

        @Override
        public toPredicate the Predicate (Root <Lable> root, CriteriaQuery query, CriteriaBuilder cb) {<?>
            // query for temporarily storing the collection
            ArrayList <Predicate> List = new new ArrayList <> ();
            IF (lable.getLabelname ()! = null && "! ".equals (lable.getLabelname ())) {
                the Predicate the predicateA = cb.like (root.get (" labelName "),"% "+ lable.getLabelname () +"% "); // WHERE labelName like XXX% %
                List.add (the predicateA);
            }
            if (lable.getState()!=null&&!"".equals(lable.getState())){
                Predicate predicate = cb.equal(root.get("state"),  lable.getState() );//where state = xxx
                list.add(predicate);
            }
            //最终将查询条件拼好然后return
            Predicate[] predicates = new Predicate[list.size()];
            return cb.and( list.toArray(predicates));//where labelname like %xxx% and state = xxx

        }
    };

}

不分页：

public List<Lable> findSearch(Lable lable) {
    //Spring Data JPA使用JpaSpecificationExecutor构建条件查询
    return lableDao.findAll(createSpecification(lable));
}

分页：
public Page<Lable> pageQuery(int pageNum, int size, Lable lable) {
    //封装分页对象
    Pageable pageable = PageRequest.of(pageNum - 1, size);
    return lableDao.findAll(createSpecification(lable),pageable);
}



controller：

@RequestMapping(value = "/search",method = RequestMethod.POST) public Result findSearch(@RequestBody Lable lable){ List<Lable> lables = lableService.findSearch(lable); return new Result(true,StatusCode.OK,"查询成功",lables); } @RequestMapping(value = "/search/{pageNum}/{size}",method = RequestMethod.POST) public Result pageQuery(@PathVariable int pageNum,@PathVariable int size,@RequestBody Lable lable){ Page<Lable> pages = lableService.pageQuery(pageNum,size,lable); return new Result(true,StatusCode.OK,"查询成功",new PageResult<Lable>(pages.getTotalElements(),pages.getContent())); }