报错 Error updating database.

项目其中一个功能用不了报错
报错代码

org.springframework.dao.DataIntegrityViolationException:

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (studentmanager/s_course, CONSTRAINT course_teacher_foreign FOREIGN KEY (teacher_id) REFERENCES s_teacher (id))

The error may involve com.wdd.studentmanager.mapper.TeacherMapper.deleteTeacher-Inline

The error occurred while setting parameters

SQL: delete from s_teacher WHERE id in ( ? )

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (studentmanager/s_course, CONSTRAINT course_teacher_foreign FOREIGN KEY (teacher_id) REFERENCES s_teacher (id))

; ]; Cannot delete or update a parent row: a foreign key constraint fails (studentmanager/s_course, CONSTRAINT course_teacher_foreign FOREIGN KEY (teacher_id) REFERENCES s_teacher (id)); nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (studentmanager/s_course, CONSTRAINT course_teacher_foreign FOREIGN KEY (teacher_id) REFERENCES s_teacher (id))

我的建议是把你表中的外键删除掉。
阿里规约中不允许使用外键，会存在各种各样的问题

数据库主外键冲突，你不能删除在别的表中有外键的主键数据。你也不能更新主键。
大概意思就是。
比如你有个user表，主键id，另一张表比如信息表其中引用了user表的主键作为外键，这个时候，你不能更新或者删除user表的主键，因为这会破坏主外键约束。
teacher_id
这个是你错误的字段