基于SpringBoot3和JDK17，集成H2数据库和jpa

package com.donny.demo.h2.controller; import com.donny.demo.h2.dao.GradeRepository; import com.donny.demo.h2.dao.StudentRepository; import com.donny.demo.h2.dao.TeacherRepository; import com.donny.demo.h2.model.entity.Grade; import com.donny.demo.h2.model.entity.Student; import com.donny.demo.h2.model.entity.Teacher; import jakarta.annotation.Resource; import lombok.extern.slf4j.Slf4j; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.ArrayList; import java.util.List; /** * @author [email protected] * @version 1.0 * @since 2024年05月30日 下午5:26 */ @RestController @RequestMapping("/init") @Slf4j public class InitController { @Resource StudentRepository studentRepository; @Resource TeacherRepository teacherRepository; @Resource GradeRepository gradeRepository; @GetMapping("/initData") public String initData() { Student student1 = new Student(); student1.setName("刘备"); Student student2 = new Student(); student2.setName("孫權"); Student student3 = new Student(); student3.setName("曹操"); List<Student> l = new ArrayList<>(); l.add(student1); l.add(student2); l.add(student3); this.studentRepository.saveAllAndFlush(l); Teacher teacher1 = new Teacher(); teacher1.setName("张 sir"); teacher1.setSubject("语文"); Teacher teacher2 = new Teacher(); teacher2.setName("刘 sir"); teacher2.setSubject("数学"); Teacher teacher3 = new Teacher(); teacher3.setName("陈 sir"); teacher3.setSubject("英文"); List<Teacher> t = new ArrayList<>(); t.add(teacher1); t.add(teacher2); t.add(teacher3); this.teacherRepository.saveAllAndFlush(t); Grade grade1 = new Grade(); grade1.setName("1班"); grade1.setStudentId(student1); grade1.setTeacherId(teacher1); Grade grade2 = new Grade(); grade2.setName("2班"); grade2.setStudentId(student2); grade2.setTeacherId(teacher2); Grade grade3 = new Grade(); grade3.setName("3班"); grade3.setStudentId(student3); grade3.setTeacherId(teacher3); Grade grade4 = new Grade(); grade4.setName("1班"); grade4.setTeacherId(teacher2); Grade grade5 = new Grade(); grade5.setName("1班"); grade5.setTeacherId(teacher3); List<Grade> g = new ArrayList<>(); g.add(grade1); g.add(grade2); g.add(grade3); g.add(grade4); g.add(grade5); this.gradeRepository.saveAllAndFlush(g); return "OK"; } }