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django2.2連oracle11g版本沖突怎么辦

發布時間：2020-07-03 09:23:38 來源：億速云 閱讀：245 作者：清晨 欄目：開發技術

小編給大家分享一下django2.2連oracle11g版本沖突怎么辦，希望大家閱讀完這篇文章后大所收獲，下面讓我們一起去探討方法吧！

上次用django2.2和oracle11g，在migrate的時候發生了版本沖突，最終將Oracle升級到了12c才解決問題

那么到底能不能用別的方法來解決這個沖突呢？想了個解決思路，實踐一下：

用django2.2連Oracle12c環境下做migrate，創建基礎表

將基礎表導出，再導入到Oracle11g數據庫中

用django2.2連Oracle11g

實施步驟

1、用django2.2連Oracle12c環境下做migrate，創建基礎表

在前文中已經完成，連接到數據庫，可以看到有10張基礎表

django2.2連oracle11g版本沖突怎么辦

看一張表，比如AUTH_GROUP表，發現有個ID字段是用了12c特有的generated語法，除了DJANGO_SESSION外，其他每張表都有一個自增序列的id字段作為主鍵。

-- Create table
create table AUTH_GROUP
(
 id NUMBER(11) generated by default on null as identity,
 name NVARCHAR2(150)
)
tablespace DJANGO;
-- Create/Recreate primary, unique and foreign key constraints 
alter table AUTH_GROUP
 add primary key (ID)
 using index 
 tablespace DJANGO;
alter table AUTH_GROUP
 add unique (NAME)
 using index 
 tablespace DJANGO;

2. 將基礎表導出，再導入到Oracle11g數據庫中

導出django用戶數據庫，注意使用11g版本

django2.2連oracle11g版本沖突怎么辦

接著導入到11g數據庫中，非常順利

django2.2連oracle11g版本沖突怎么辦

再看AUTH_GROUP表，發現表結構是一樣的，但是id上面自增序列的默認值沒有了。

-- Create table
create table AUTH_GROUP
(
 id NUMBER(11) not null,
 name NVARCHAR2(150)
)
tablespace DJANGO;
-- Create/Recreate primary, unique and foreign key constraints 
alter table AUTH_GROUP
 add primary key (ID)
 using index 
 tablespace DJANGO;
alter table AUTH_GROUP
 add unique (NAME)
 using index 
 tablespace DJANGO;

3、用django2.2連Oracle11g

修改settings文件，連Oracle11g，然后啟動django服務，果然成功啟動

django2.2連oracle11g版本沖突怎么辦

django2.2連oracle11g版本沖突怎么辦

但是，但是，創建admin用戶密碼的時候就報錯了，ORA-01400: cannot insert NULL into (“DJANGO”.“AUTH_USER”.“ID”)

PS D:\parttime\python\django\guanxiangzhiji> python manage.py createsuperuser
用戶名 (leave blank to use 'administrator'):
電子郵件地址:
Password:
Password (again):
密碼長度太短。密碼必須包含至少 8 個字符。
這個密碼太常見了。
Bypass password validation and create user anyway? [y/N]: y
Traceback (most recent call last):
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
 return self.cursor.execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\oracle\base.py", line 510, in execute
 return self.cursor.execute(query, self._param_generator(params))
cx_Oracle.IntegrityError: ORA-01400: cannot insert NULL into ("DJANGO"."AUTH_USER"."ID")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
 File "manage.py", line 21, in <module>
 main()
 File "manage.py", line 17, in main
 execute_from_command_line(sys.argv)
 File "D:\app\anaconda\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
 utility.execute()
 File "D:\app\anaconda\lib\site-packages\django\core\management\__init__.py", line 375, in execute
 self.fetch_command(subcommand).run_from_argv(self.argv)
 File "D:\app\anaconda\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
 self.execute(*args, **cmd_options)
 File "D:\app\anaconda\lib\site-packages\django\contrib\auth\management\commands\createsuperuser.py", line 61, in execute
 return super().execute(*args, **options)
 File "D:\app\anaconda\lib\site-packages\django\core\management\base.py", line 364, in execute
 output = self.handle(*args, **options)
 File "D:\app\anaconda\lib\site-packages\django\contrib\auth\management\commands\createsuperuser.py", line 156, in handle
 self.UserModel._default_manager.db_manager(database).create_superuser(**user_data)
 File "D:\app\anaconda\lib\site-packages\django\contrib\auth\models.py", line 162, in create_superuser
 return self._create_user(username, email, password, **extra_fields)
 File "D:\app\anaconda\lib\site-packages\django\contrib\auth\models.py", line 145, in _create_user
 user.save(using=self._db)
 File "D:\app\anaconda\lib\site-packages\django\contrib\auth\base_user.py", line 66, in save
 super().save(*args, **kwargs)
 File "D:\app\anaconda\lib\site-packages\django\db\models\base.py", line 741, in save
 force_update=force_update, update_fields=update_fields)
 File "D:\app\anaconda\lib\site-packages\django\db\models\base.py", line 779, in save_base
 force_update, using, update_fields,
 File "D:\app\anaconda\lib\site-packages\django\db\models\base.py", line 870, in _save_table
 result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
 File "D:\app\anaconda\lib\site-packages\django\db\models\base.py", line 908, in _do_insert
 using=using, raw=raw)
 File "D:\app\anaconda\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
 return getattr(self.get_queryset(), name)(*args, **kwargs)
 File "D:\app\anaconda\lib\site-packages\django\db\models\query.py", line 1186, in _insert
 return query.get_compiler(using=using).execute_sql(return_id)
 File "D:\app\anaconda\lib\site-packages\django\db\models\sql\compiler.py", line 1335, in execute_sql
 cursor.execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 99, in execute
 return super().execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 67, in execute
 return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
 return executor(sql, params, many, context)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
 return self.cursor.execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\utils.py", line 89, in __exit__
 raise dj_exc_value.with_traceback(traceback) from exc_value
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
 return self.cursor.execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\oracle\base.py", line 510, in execute
 return self.cursor.execute(query, self._param_generator(params))
django.db.utils.IntegrityError: ORA-01400: cannot insert NULL into ("DJANGO"."AUTH_USER"."ID")

原因分析

很明顯，插入到AUTH_USER表時，沒有指定ID的值，而ID是主鍵，非空。

因為在12c的環境下，這個ID是自增序列，insert語句中不需要指定這個值。

解決方案

解決方案也應運而出了，只要為每個ID列創建一個11g的序列，創建觸發器，在插入數據時補上id值就行了。

（1）生成序列。

用sql語句

select 'create sequence seq_'||table_name||' minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;'
 from user_tab_columns
 where column_name='ID';

生成創建序列的批量執行語句，并執行。

create sequence seq_DJANGO_ADMIN_LOG minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_AUTH_USER minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_AUTH_USER_GROUPS minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_DJANGO_CONTENT_TYPE minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_AUTH_GROUP minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_AUTH_GROUP_PERMISSIONS minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_DJANGO_MIGRATIONS minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_AUTH_PERMISSION minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;
create sequence seq_AUTH_USER_USER_PERMISSIONS minvalue 1 maxvalue 999999999 start with 1 increment by 1 cache 20;

（2）創建觸發器

用SQL語句

select 'create or replace trigger tri_'||table_name||'
 before insert
 on '||table_name||' 
 for each row
 declare
 begin
 :new.id:=seq_'||table_name||'.nextval;
 end tri_'||table_name||';
 /'
 from user_tab_columns
 where column_name='ID';

生成觸發器腳本：

create or replace trigger tri_DJANGO_MIGRATIONS
	before insert
	on DJANGO_MIGRATIONS
	for each row
declare
begin
	:new.id:=seq_DJANGO_MIGRATIONS.nextval;
end tri_DJANGO_MIGRATIONS;
/
create or replace trigger tri_DJANGO_CONTENT_TYPE
	before insert
	on DJANGO_CONTENT_TYPE
	for each row
declare
begin
	:new.id:=seq_DJANGO_CONTENT_TYPE.nextval;
end tri_DJANGO_CONTENT_TYPE;
/
create or replace trigger tri_AUTH_PERMISSION
	before insert
	on AUTH_PERMISSION
	for each row
declare
begin
	:new.id:=seq_AUTH_PERMISSION.nextval;
end tri_AUTH_PERMISSION;
/
create or replace trigger tri_AUTH_GROUP
	before insert
	on AUTH_GROUP
	for each row
declare
begin
	:new.id:=seq_AUTH_GROUP.nextval;
end tri_AUTH_GROUP;
/
create or replace trigger tri_AUTH_GROUP_PERMISSIONS
	before insert
	on AUTH_GROUP_PERMISSIONS
	for each row
declare
begin
	:new.id:=seq_AUTH_GROUP_PERMISSIONS.nextval;
end tri_AUTH_GROUP_PERMISSIONS;
/
create or replace trigger tri_AUTH_USER
	before insert
	on AUTH_USER
	for each row
declare
begin
	:new.id:=seq_AUTH_USER.nextval;
end tri_AUTH_USER;
/
create or replace trigger tri_AUTH_USER_GROUPS
	before insert
	on AUTH_USER_GROUPS
	for each row
declare
begin
	:new.id:=seq_AUTH_USER_GROUPS.nextval;
end tri_AUTH_USER_GROUPS;
/
create or replace trigger tri_AUTH_USER_USER_PERMISSIONS
	before insert
	on AUTH_USER_USER_PERMISSIONS
	for each row
declare
begin
	:new.id:=seq_AUTH_USER_USER_PERMISSIONS.nextval;
end tri_AUTH_USER_USER_PERMISSIONS;
/
create or replace trigger tri_DJANGO_ADMIN_LOG
	before insert
	on DJANGO_ADMIN_LOG
	for each row
declare
begin
	:new.id:=seq_DJANGO_ADMIN_LOG.nextval;
end tri_DJANGO_ADMIN_LOG;
/

（3）此時再創建admin用戶，就成功了

django2.2連oracle11g版本沖突怎么辦

新增用戶lurenjia成功！

django2.2連oracle11g版本沖突怎么辦

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