一大早的,某从库突然报出故障:SQL线程中断! 查看从库状态: mysql> show slave status\G Slave_IO_State: Waiting for master to send event Master_Log_File: mysql Read_Master_Log_Pos: Relay_Log_File: relay Relay_Log_Pos: Relay_Master_Log_File: mysql Slave_IO_Running: Yes Slave_SQL_…
HTTP Status 500 - Request processing failed; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement type Exception report message Request processing failed; nested exception is org.hibernate.exception.Co…
MySQL数据库,当我尝试在A表中设置B表的主键为外键时,报出错误:#1452 - Cannot add or update a child row: a foreign key constraint fails 于是去搜索了一下 "#1452 - Cannot add or update a child row: a foreign key constraint fails" 的含义与解决方法,根据这篇博文去排查了报错原因,排除了可能1和可能2,然后去研究可能3的具体含义,一开始并…
#创建班级表 class Classes(models.Model): title = models.CharField(max_length=32) n=models.ManyToManyField('Teachers') #创建老师表 class Teachers(models.Model): name= models.CharField(max_length=32) age=models.IntegerField(default=30) gender=models.BooleanField…