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102 lines
2.8 KiB
Python
102 lines
2.8 KiB
Python
"""
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Alembic 环境配置
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用于数据库迁移的运行时环境设置
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"""
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from logging.config import fileConfig
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from sqlalchemy import engine_from_config, pool
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from alembic import context
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import os
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import sys
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from pathlib import Path
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# 添加项目根目录到 Python 路径
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sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
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# 加载 .env 文件（本地开发时需要）
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try:
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from dotenv import load_dotenv
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env_file = Path(__file__).parent.parent / ".env"
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if env_file.exists():
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load_dotenv(env_file)
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except ImportError:
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pass
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# 导入所有数据库模型（确保 Alembic 能检测到所有表）
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from src.models.database import Base
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# Alembic Config 对象
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config = context.config
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# 从环境变量获取数据库 URL
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# 优先使用 DATABASE_URL，否则从 DB_PASSWORD 自动构建（与 docker-compose 保持一致）
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database_url = os.getenv("DATABASE_URL")
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if not database_url:
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db_password = os.getenv("DB_PASSWORD", "")
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db_host = os.getenv("DB_HOST", "localhost")
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db_port = os.getenv("DB_PORT", "5432")
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db_name = os.getenv("DB_NAME", "aether")
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db_user = os.getenv("DB_USER", "postgres")
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database_url = f"postgresql://{db_user}:{db_password}@{db_host}:{db_port}/{db_name}"
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config.set_main_option("sqlalchemy.url", database_url)
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# 配置日志
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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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# 目标元数据（包含所有表定义）
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target_metadata = Base.metadata
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def run_migrations_offline() -> None:
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"""
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离线模式运行迁移
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在离线模式下，不需要连接数据库，
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只生成 SQL 脚本
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"""
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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, # 比较列类型变更
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compare_server_default=True, # 比较默认值变更
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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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"""
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在线模式运行迁移
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在线模式下，直接连接数据库执行迁移
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"""
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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, # 比较列类型变更
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compare_server_default=True, # 比较默认值变更
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)
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with context.begin_transaction():
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context.run_migrations()
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# 根据模式选择运行方式
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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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