1.在实际开发中,遇到一个接口。需要分页,排序,条件查询。使用JPA实现会比较麻烦。使用queryDSL便能够很轻松实现。
不废话,直接上代码。
Controller层:
import com.five.fiveeducation.entity.Student;
import com.five.fiveeducation.service.EducationService;
import com.querydsl.core.types.Predicate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.querydsl.binding.QuerydslPredicate;
import org.springframework.data.web.PageableDefault;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
@PostMapping(value = "findHost")
public List<Student> findHost(@PageableDefault(sort = {"host"},direction = Sort.Direction.DESC) Pageable pageable){
return educationService.findHost(pageable).getContent();
}
先实现按照host属性排序,分页的功能
Service层:
import com.five.fiveeducation.dao.EducationDao;
import com.five.fiveeducation.entity.QStudent;
import com.five.fiveeducation.entity.Student;
import com.querydsl.core.types.Predicate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
public Page<Student> findHost(Pageable pageable) {
QStudent student = QStudent.student;
Predicate predicate = student.startDate.after(new Date());
return educationDao.findAll(predicate,pageable);
}
完成复杂查询功能,本人也是刚接触,后续有更复杂的查询也会分享。同时希望大家多多交流。
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