Python Django适配dm8(达梦)数据库

官方文档

https://eco.dameng.com/document/dm/zh-cn/start/python-development.html

Django适配达梦

https://blog.csdn.net/qq_35349982/article/details/132165581

https://blog.csdn.net/weixin_61894388/article/details/126330168

项目适配达梦

1. 升级或安装依赖

Django==3.1.7
django-dmPython==3.1.7
dmPython==2.5.5

2. 更改所有的model文件把db_table = 'ROLE'小写改成大写
3. 修改连接数据库方式

# 达梦数据库
DATABASES = {
    'default': {
        'ENGINE': 'django_dmPython',
        'NAME': 'dm8_test',
        'USER': 'SYSDBA',
        'PASSWORD': 'SYSDBA001',
        'HOST': '127.0.0.1',
        'PORT': '5236',
    }
}

命令

https://www.modb.pro/db/237497

https://blog.51cto.com/u_7548043/5464097

https://www.cnblogs.com/zdstudy/p/16550878.html

https://blog.csdn.net/Dyeln/article/details/125877919

http://www.floverow.com/index.php?id=725

https://blog.csdn.net/hongweigg/article/details/92621952

部署达梦数据库/启动

命令解析：https://blog.csdn.net/Januea/article/details/134240787

docker run -d -p 30236:5236 --restart=always --name dm8_test --privileged=true -e PAGE_SIZE=16 -e LD_LIBRARY_PATH=/opt/dmdbms/bin -e  EXTENT_SIZE=32 -e BLANK_PAD_MODE=1 -e LOG_SIZE=1024 -e UNICODE_FLAG=1 -e LENGTH_IN_CHAR=1 -e INSTANCE_NAME=dm8_test -v /data/dm8_test:/opt/dmdbms/data dm8_single:dm8_20230808_rev197096_x86_rh6_64

python manage.py makemigrations accounts application commons mssa report upgrade

python manage.py migrate

python3 manage.py shell -c "from django.contrib.auth.models import User; User.objects.create_superuser('admin@admin.com', 'admin@admin.com', 'Admin123')"

基础命令

# 链接 SYSDBA是默认用户名 SYSDBA001是默认密码
/opt/dmdbms/bin/disql SYSDBA/SYSDBA001 

#查看表结构
SELECT DBMS_METADATA.GET_DDL('TABLE','table_name') FROM dual;

问题汇总

1. 插入数据时，报错DatabaseError: [CODE:-2111]

(dmdbms) tjw@tjw-ThinkPad-P15v-Gen-1:/var/www/rc-platform$ python manage.py migrate
Operations to perform:
  Apply all migrations: accounts, admin, application, auth, commons, contenttypes, mssa, report, sessions, upgrade
Running migrations:
  Applying auth.0003_alter_user_email_max_length...Traceback (most recent call last):
  File "/home/tjw/.virtualenvs/dmdbms/lib/python3.8/site-packages/django/db/backends/utils.py", line 82, in _execute
    return self.cursor.execute(sql)
  File "/home/tjw/.virtualenvs/dmdbms/lib/python3.8/site-packages/django_dmPython/base.py", line 439, in execute
    return self.cursor.execute(query, args)
dmPython.DatabaseError: [CODE:-2111]第1 行附近出现错误:
无效的列名[AAAAAAAAAAAAAAAAAO]

解决方式

修改源码，位置django_dmPython/operations.py

query = """select %s from %s where rowid = '%s'""" %(self.quote_name(pk_name), self.quote_name(table_name), cursor.lastrowid

借鉴：https://blog.csdn.net/m0_69072302/article/details/128836334

2. 无效的列名[WTKJE]

解决方式

# 把model.py 的db_table由小写改成大写即可
    class Meta:
        db_table = 'ROLE'

3. dmPython.IntegrityError: [CODE:-6609]违反列[LAST_LOGIN]非空约束

解决方式：使用sql把字段改成去掉约束

ALTER TABLE AUTH_USER MODIFY LAST_LOGIN NULL;