起因

同步表的過(guò)程中，我手動(dòng)將數(shù)據(jù)庫(kù)中的一個(gè)表刪除了，此時(shí)再去執(zhí)行命令，發(fā)現(xiàn)不能再數(shù)據(jù)庫(kù)中新建表了

修改了表結(jié)構(gòu)以后執(zhí)行python3 manage.py migrate 報(bào)錯(cuò):

No changes detected

所以進(jìn)數(shù)據(jù)庫(kù)把對(duì)應(yīng)的表刪除了,想著重新生成這張表.

刪除表以后執(zhí)行:

python3 manage.py makemigrationspython3 manage.py migrate

還是不能生成表,提示:No changes detected

處理過(guò)程

一、首先刪除了app對(duì)應(yīng)目錄下的數(shù)據(jù)庫(kù)對(duì)應(yīng)的文件和緩存文件:

$ rm -rf migrations/ __pycache__/

一般可以從本地刪除

重新執(zhí)行:

···$ python3 manage.py makemigrationsNo changes detected /code/django/blogproject~/code/django/blogproject /code/django/blogproject python3 manage.py makemigrations commentsMigrations for ‘comments’:comments/migrations/0001_initial.py- Create model Comment /code/django/blogproject~/code/django/blogproject /code/django/blogproject python3 manage.py migrateOperations to perform:Apply all migrations: admin, auth, blog, comments, contenttypes, sessions, usersRunning migrations:No migrations to apply.···

二、刪除app下面目錄migrations下面除了init.py其他的所有文件

三、最后，刪除migrations中關(guān)于你的app的同步數(shù)據(jù)數(shù)據(jù)庫(kù)記錄

delete from django_migrations where app=‘yourappname’;

重新執(zhí)行生成數(shù)據(jù)庫(kù)命令:

$ python3 manage.py makemigrations commentsNo changes detected in app ’comments’$~/code/django/blogproject$ python3 manage.py migrate commentsOperations to perform: Apply all migrations: commentsRunning migrations: Applying comments.0001_initial... OK

數(shù)據(jù)表順利生成.

結(jié)論

在執(zhí)行

python3 manage.py makemigrationspython3 manage.py migrate

操作的時(shí)候,不僅會(huì)創(chuàng)建0001_initial.py對(duì)應(yīng)的模型腳本,還會(huì)創(chuàng)建一個(gè)數(shù)據(jù)庫(kù)記錄創(chuàng)建的模型.如果想重新生成數(shù)據(jù)庫(kù),需要三個(gè)地方都做刪除.

以上這篇Django 解決新建表刪除后無(wú)法重新創(chuàng)建等問(wèn)題就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持好吧啦網(wǎng)。