我正在執行從sqlite到oracle後端的遷移。 oracle數據庫已經存在並且由其他人維護。它的版本是Oracle9i企業版版本9.2.0.1.0。將任何實例保存到數據庫時出現Django Oracle完整性錯誤
我有一個簡單的模型:
class AliasType(models.Model):
id = models.AutoField(primary_key=True, db_column="F_ALIAS_ID")
name = models.CharField(u"Type name", max_length=255, unique=True, db_column="F_ALIAS_NAME")
class Meta:
db_table = "ALIAS"
./manage.py syncdb
不返回任何錯誤。如果我指定的ID,例如
>>> AliasType.objects.create(name="test")
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/manager.py", line 138, in create
return self.get_query_set().create(**kwargs)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/query.py", line 360, in create
obj.save(force_insert=True, using=self.db)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/base.py", line 460, in save
self.save_base(using=using, force_insert=force_insert, force_update=force_update)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/base.py", line 553, in save_base
result = manager._insert(values, return_id=update_pk, using=using)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/manager.py", line 195, in _insert
return insert_query(self.model, values, **kwargs)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/query.py", line 1435, in insert_query
return query.get_compiler(using=using).execute_sql(return_id)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/sql/compiler.py", line 791, in execute_sql
cursor = super(SQLInsertCompiler, self).execute_sql(None)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/models/sql/compiler.py", line 735, in execute_sql
cursor.execute(sql, params)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/backends/util.py", line 18, in execute
return self.cursor.execute(sql, params)
File "/mnt/Data/private/projects/envs/termary-oracle/src/django/django/db/backends/oracle/base.py", line 630, in execute
return self.cursor.execute(query, self._param_generator(params))
IntegrityError: ORA-01400: cannot insert NULL into ("SINCE"."ALIAS"."F_ALIAS_ID")
:但是當我嘗試創建一個新的實例,並將其保存到數據庫中,我得到以下錯誤AliasType.objects.create(id=5, name="test")
,它的工作原理。我認爲django應該能夠自動檢索id值。我瞭解到Oracle不支持自動增量,我應該使用觸發器和序列。我被告知數據庫中存在一個現有的序列,它返回所有新行的id,並且我知道它的名稱,如SEQ_GET_NEW_ID
。
所以問題是如何以最優雅的方式實現它,即如何告訴Django到get id values for all new objects from the sequence named SEQ_GET_NEW_ID
而沒有太多黑客攻擊(例如,覆蓋所有模型的save()方法)?
謝謝你的回答。它幫助我找到了解決方法。我問維護數據庫的人爲所有表創建觸發器。觸發器在從相同序列「SEQ_GET_NEW_ID」插入之前獲得下一個ID。因此這裏不需要用於序列的別名。 – 2011-02-07 15:10:50