[{teacherId:null,TeacherName:zhangsan,StudentId:001,StudentName:lisi},{teacherId:null,TeacherName:zhangsan,StudentId:002,StudentName:wangwu}]怎么使用mybatis将上边对象批量插入老师表获取插入id之后再批量学生表关联该id

可以使用MyBatis的批量插入功能和返回主键值的功能来实现。

首先，在Mapper中定义两个方法，一个用于批量插入老师，另一个用于批量插入学生。老师表需要返回主键值，所以使用useGeneratedKeys和keyProperty来指定返回主键值的属性名。

public interface TeacherMapper {
    @Insert({
        "<script>",
        "insert into teacher(TeacherName) values ",
        "<foreach collection='list' item='item' index='index' separator=','>",
        "(#{item.teacherName})",
        "</foreach>",
        "</script>"
    })
    @Options(useGeneratedKeys = true, keyProperty = "teacherId")
    void batchInsertTeacher(List<Teacher> teacherList);

    @Insert({
        "<script>",
        "insert into student(TeacherId, StudentName) values ",
        "<foreach collection='list' item='item' index='index' separator=','>",
        "(#{item.teacherId}, #{item.studentName})",
        "</foreach>",
        "</script>"
    })
    void batchInsertStudent(List<Student> studentList);
}

然后，在Service中调用这两个方法。首先调用batchInsertTeacher方法批量插入老师表，然后获取插入的主键值，再将主键值设置给对应的学生对象，最后调用batchInsertStudent方法批量插入学生表。

@Service
public class TeacherStudentService {
    @Autowired
    private TeacherMapper teacherMapper;

    @Autowired
    private StudentMapper studentMapper;

    public void batchInsert(List<Teacher> teacherList, List<Student> studentList) {
        // 批量插入老师表
        teacherMapper.batchInsertTeacher(teacherList);

        // 获取插入的主键值
        for (int i = 0; i < teacherList.size(); i++) {
            teacherList.get(i).setTeacherId(teacherMapper.selectKey());
        }

        // 批量插入学生表
        studentMapper.batchInsertStudent(studentList);
    }
}