88 lines
2.5 KiB
Python
88 lines
2.5 KiB
Python
"""
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Alembic 迁移环境配置。
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使用说明:
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# 生成新迁移(自动检测模型变更)
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cd backend
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alembic revision --autogenerate -m "描述变更内容"
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# 执行迁移
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alembic upgrade head
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# 回滚一步
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alembic downgrade -1
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# 标记当前数据库为最新(首次引入 Alembic 时使用)
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alembic stamp head
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注意:首次使用时,由于数据库已由 create_all 创建,请先运行 `alembic stamp head`
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将当前状态标记为基线,之后再用 alembic 管理后续变更。
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"""
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import os
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import sys
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from logging.config import fileConfig
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from alembic import context
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from dotenv import load_dotenv
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from sqlalchemy import engine_from_config, pool
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# 将 backend 目录加入 sys.path,使 app 包可被导入
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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load_dotenv()
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# 导入所有 ORM 模型,确保它们注册到 Base.metadata
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from app.database import Base # noqa: E402
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from app import models # noqa: E402, F401
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config = context.config
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# 从环境变量动态注入数据库 URL(将 asyncpg 驱动替换为 psycopg 同步驱动)
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_async_url = os.environ.get("DATABASE_URL", "")
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_sync_url = _async_url.replace("postgresql+asyncpg://", "postgresql+psycopg://")
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if not _sync_url:
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raise RuntimeError("DATABASE_URL 环境变量未设置,无法运行 Alembic 迁移。")
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config.set_main_option("sqlalchemy.url", _sync_url)
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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target_metadata = Base.metadata
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def run_migrations_offline() -> None:
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"""离线模式:仅生成 SQL 脚本,不连接数据库。"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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compare_type=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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"""在线模式:连接数据库并执行迁移。"""
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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compare_type=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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