{"code":-1,"msg":"\r\n### Error updating database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'classes_id' cannot be null\r\n### The error may involve com.java110.things.dao.IAttendanceClassesServiceDao.saveAttendanceClassesAttr-Inline\r\n### The error occurred while setting parameters\r\n### SQL: INSERT INTO attendance_classes_attr         (`attr_id`, `classes_id`, `spec_cd`, `value`)         VALUES        (?,?,?,?)\r\n### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'classes_id' cannot be null\n; ]; Column 'classes_id' cannot be null; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'classes_id' cannot be null","total":0,"totalPage":0}