我有一个基于 pylons 和 sqlalchemy 的现有项目。我还没有在这个项目中使用 alembic 或任何包装器。
我将项目迁移到flask和sqlalchemy。 我采用了旧版本1.5的旧数据库,并使用Flast-Migrate生成了第一个迁移脚本。嗯,我意识到我必须手动完成很多事情。
在重命名列时,我已经陷入困境。我正在使用 SQLite 数据库执行此操作。
旧项目有一个表“Token”,已重命名为“token”。显然有些数据库不关心大小写。 当我尝试像这样重命名第一列时:
op.alter_column('token', 'privacyIDEATokenId', new_column_name='id')
我收到此错误:
sqlalchemy.exc.OperationalError: (OperationalError) near \
""privacyIDEATokenId"": syntax error u'ALTER TABLE token RENAME \
"privacyIDEATokenId" TO id' ()
Token.privacyIDEATokenId 列为主键,新版本中应为 token.id。 对于非主键的列也会发生同样的情况。
完整跟踪:
Traceback (most recent call last):
File "./manage.py", line 107, in <module>
manager.run()
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/flask_script/__init__.py", line 412, in run
result = self.handle(sys.argv[0], sys.argv[1:])
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/flask_script/__init__.py", line 383, in handle
res = handle(*args, **config)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/flask_script/commands.py", line 216, in __call__
return self.run(*args, **kwargs)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/flask_migrate/__init__.py", line 98, in upgrade
command.upgrade(config, revision, sql = sql, tag = tag)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/command.py", line 129, in upgrade
script.run_env()
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/script.py", line 208, in run_env
util.load_python_file(self.dir, 'env.py')
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/util.py", line 230, in load_python_file
module = load_module_py(module_id, path)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/compat.py", line 63, in load_module_py
mod = imp.load_source(module_id, path, fp)
File "migrations/env.py", line 72, in <module>
run_migrations_online()
File "migrations/env.py", line 65, in run_migrations_online
context.run_migrations()
File "<string>", line 7, in run_migrations
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/environment.py", line 696, in run_migrations
self.get_context().run_migrations(**kw)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/migration.py", line 266, in run_migrations
change(**kw)
File "migrations/versions/112475c7f45_.py", line 103, in upgrade
_upgrade_token_table()
File "migrations/versions/112475c7f45_.py", line 49, in _upgrade_token_table
op.alter_column('token', 'privacyIDEATokenId', new_column_name='id')
File "<string>", line 7, in alter_column
File "<string>", line 1, in <lambda>
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/util.py", line 353, in go
return fn(*arg, **kw)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/operations.py", line 329, in alter_column
existing_autoincrement=existing_autoincrement
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/ddl/impl.py", line 131, in alter_column
existing_nullable=existing_nullable,
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/alembic/ddl/impl.py", line 81, in _exec
conn.execute(construct, *multiparams, **params)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 729, in execute
return meth(self, multiparams, params)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/ddl.py", line 69, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 783, in _execute_ddl
compiled
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 958, in _execute_context
context)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1159, in _handle_dbapi_exception
exc_info
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 951, in _execute_context
context)
File "/home/cornelius/src/privacyidea/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 436, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (OperationalError) near ""privacyIDEATokenId"": syntax error u'ALTER TABLE token RENAME "privacyIDEATokenId" TO id' ()
最佳答案
现在您可以使用“batch migration ”在 SQLite 下启用 ALTER-ing 列:
with op.batch_alter_table('table_name') as bop:
bop.alter_column('old_column_name', new_column_name='new_name')
关于alembic - 无法使用 alter_column 重命名列,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28141521/