我正在关注Miguel的this教程。有一个用于创建迁移的迁移脚本。 nullptr
db_migrate.py为了升级数据库，它有import imp
from migrate.versioning import api
from app import db
from config import SQLALCHEMY_DATABASE_URI
from config import SQLALCHEMY_MIGRATE_REPO
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
migration = SQLALCHEMY_MIGRATE_REPO + ('/versions/%03d_migration.py' % (v+1))
tmp_module = imp.new_module('old_model')
old_model = api.create_model(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
exec(old_model, tmp_module.__dict__)
script = api.make_update_script_for_model(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO, tmp_module.meta, db.metadata)
open(migration, "wt").write(script)
api.upgrade(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
print('New migration saved as ' + migration)
print('Current database version: ' + str(v))
。
db_upgrade.py现在每次运行from migrate.versioning import api
from config import SQLALCHEMY_DATABASE_URI
from config import SQLALCHEMY_MIGRATE_REPO
api.upgrade(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
print('Current database version: ' + str(v))
时，它都会创建一个每次都包含相同代码的迁移文件：
db_migrate.py如果我运行from sqlalchemy import *
from migrate import *
from migrate.changeset import schema
pre_meta = MetaData()
post_meta = MetaData()
def upgrade(migrate_engine):
# Upgrade operations go here. Don't create your own engine; bind
# migrate_engine to your metadata
pre_meta.bind = migrate_engine
post_meta.bind = migrate_engine
def downgrade(migrate_engine):
# Operations to reverse the above upgrade go here.
pre_meta.bind = migrate_engine
post_meta.bind = migrate_engine
，它只会增加数据库中db_upgrade.py表中的迁移版本，但不会创建新表。
我是否需要手动编辑迁移文件以创建表？
配置：
migrate_version这是我的SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@localhost/microblog'
SQLALCHEMY_MIGRATE_REPO = os.path.join(BASEDIR, 'db_repository')
models.py