我有一个包含5列和大量数据的特定表的现有数据库。 (我从CSV导入了这个)
如果我在MySql中执行DESCRIBE student_info,它会显示:
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| pic_id | int(11) | YES | | NULL | |
| name | varchar(50) | YES | | NULL | |
| hostel | varchar(3) | YES | | NULL | |
| room | int(11) | YES | | NULL | |
| branch | varchar(4) | YES | | NULL | |
| id_no | varchar(12) | YES | | NULL | |
+--------+-------------+------+-----+---------+-------+
这个表包含所有数据,因为我已经通过各种SELECT语句和Workbench
进行了测试在settings.py中,我将项目配置为成功连接该数据库。 然后,我发出了命令
python manage.py inspectdb > studentinfo/models.py
models.py的内容变为:
class StudentInfo(models.Model):
pic_id = models.IntegerField(null=True, blank=True)
name = models.CharField(max_length=150, blank=True)
hostel = models.CharField(max_length=9, blank=True)
room = models.IntegerField(null=True, blank=True)
branch = models.CharField(max_length=12, blank=True)
id_no = models.CharField(max_length=36, blank=True)
class Meta:
db_table = u'student_info'
然后,如果我在syncdb之后执行此操作:
python manage.py sqlall studentinfo
BEGIN;
CREATE TABLE `student_info` (
`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
`pic_id` integer,
`name` varchar(150) NOT NULL,
`hostel` varchar(9) NOT NULL,
`room` integer,
`branch` varchar(12) NOT NULL,
`id_no` varchar(36) NOT NULL
)
;
COMMIT;
所以一切似乎都是有序的,除非我试图回复任何事情我都会收到这个错误:
>>> from studentinfo.models import StudentInfo
>>> list=StudentInfo.objects.all()
>>> list
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/django/db/models/query.py", line 69, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/usr/lib/python2.7/dist-packages/django/db/models/query.py", line 84, in __len__
self._result_cache.extend(self._iter)
File "/usr/lib/python2.7/dist-packages/django/db/models/query.py", line 273, in iterator
for row in compiler.results_iter():
File "/usr/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 680, in results_iter
for rows in self.execute_sql(MULTI):
File "/usr/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 735, in execute_sql
cursor.execute(sql, params)
File "/usr/lib/python2.7/dist-packages/django/db/backends/util.py", line 34, in execute
return self.cursor.execute(sql, params)
File "/usr/lib/python2.7/dist-packages/django/db/backends/mysql/base.py", line 86, in execute
return self.cursor.execute(query, args)
File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
self.errorhandler(self, exc, value)
File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
**OperationalError: (1054, "Unknown column 'student_info.id' in 'field list'")**
知道可能导致这种情况的原因吗?
答案 0 :(得分:7)
sqlall
只显示在使用空数据库运行syncdb时将创建的内容。从您的DESCRIBE
可以明显看出,没有id
字段 - 实际上根本没有主键,这是一个非常奇怪的设计。您需要通过SQL手动添加字段。
答案 1 :(得分:2)
我使用遗留数据库时遇到了同样的情况。
问题是,一个vanilla查询集,将尝试获取id来构建模型对象。我最终做的是使用.values()查询。这样,就没有模型构建,也没有id。