jpa 查询

SpringBootJPA/src/main/java/com/zz/controller/StudentController.java

@@ -4,6 +4,7 @@ import java.util.List;
 
 import javax.annotation.Resource;
 
+import org.springframework.data.domain.Page;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -22,5 +23,16 @@ public class StudentController {
 		return studentService.findBySubjectOrderByScoreDesc(sub);
 	}
 	
+	//测试地址：http://localhost:9081/b/student/pagesub/数学/1/3
+	@RequestMapping("pagesub/{name}/{start}/{limit}")
+	public Page<Student> showPageBySub(@PathVariable("name") String sub,@PathVariable("start") String start,@PathVariable("limit") String limit){
+		return studentService.findBySubjectOrderByScoreDesc(sub, start, limit);
+	}
+	
+	@RequestMapping("showone/{name}/{tid}")
+	public Student showPageBySub(@PathVariable("name") String name,@PathVariable("tid") String tid){
+		return studentService.getStudent(Integer.parseInt(tid), name);
+	}
+	
 	
 }

SpringBootJPA/src/main/java/com/zz/repository/StudentRepository.java

@@ -2,7 +2,10 @@ package com.zz.repository;
 
 import java.util.List;
 
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
 
 import com.zz.entity.Student;
@@ -13,5 +16,26 @@ public interface StudentRepository extends  JpaRepository<Student,Integer>{
 	public List<Student> findBySubjectOrderByScoreDesc(String sub);
 	
 	
+	public Page<Student> findBySubjectOrderByScoreDesc(String sub,Pageable pageable);
+	//默认使用JPQL，操作的是对象，所以里面的列名字必须和entity的属性名字一样
+	@Query("select s from Student s where s.teamId=?1 and s.name=?2")
+	public Student getStudentsssdfds(int tid,String name);
+	//ativeQuery=true 表示使用SQL，
+	//操作的是数据库表，所以里面的列名字必须和数据库里面列的名字一样
+	@Query(value="select * from student  where team_id=?1 and name=?2",nativeQuery=true)
+	public Student getStudentsdfsdfnative(int tid,String name);
+	
+	
+	
+	@Query(value="select subject,count(*) from student  group by subject",nativeQuery=true)
+	public List<Object[]> getSubGroup();
+	
+	@Query(value="select u.name,uh.homework_id from user u left join user_homework uh on (u.id=uh.user_id and uh.homework_id=?1)",nativeQuery=true)
+	public List<Object[]> selectHomeWork(String hid);
+	
+	
+	
+	
+	
 	
 }

SpringBootJPA/src/main/java/com/zz/service/StudentService.java

@@ -2,9 +2,14 @@ package com.zz.service;
 import java.util.List;
 
 import javax.annotation.Resource;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 
 import com.zz.entity.Student;
+import com.zz.entity.User;
 import com.zz.repository.StudentRepository;
 @Service
 public class StudentService {
@@ -15,4 +20,13 @@ public class StudentService {
 		return studentRepository.findBySubjectOrderByScoreDesc(sub);
 	};
 	
+	public Page<Student> findBySubjectOrderByScoreDesc(String sub,String startpage,String limit){
+		Pageable pageable = PageRequest.of(Integer.parseInt(startpage), Integer.parseInt(limit));
+		return studentRepository.findBySubjectOrderByScoreDesc(sub,pageable);
+	};
+	
+	public Student getStudent(int tid,String name){
+		return studentRepository.getStudentsssdfds(tid, name);
+	};
+	
 }