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90 lines
2.5 KiB
Python
90 lines
2.5 KiB
Python
"""
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Alembic 的在线执行与离线 SQL 生成入口，装配历史迁移需要的缓存依赖。
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"""
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from logging.config import fileConfig
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from sqlalchemy import engine_from_config
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from sqlalchemy import pool
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from alembic import context
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from app.db.base import Base
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from app.startup.initializers.cache import configure_cache_dependencies
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# 历史迁移会调用使用 FileCache 的业务清理链，Alembic 自身也是组合入口。
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configure_cache_dependencies()
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config = context.config
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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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# 使用宿主模型元数据生成结构差异。
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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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按连接地址生成迁移 SQL，不建立数据库连接。
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配置字面量参数，并为 SQLite 启用批量表结构迁移；迁移中的执行语句输出到脚本。
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依赖实时反射或数据读取的历史迁移不能仅靠离线模式执行。
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"""
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url = config.get_main_option("sqlalchemy.url")
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if url and "postgresql" in 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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)
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else:
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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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render_as_batch=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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"""
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建立独占连接并在迁移事务中执行版本链。
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使用无连接池引擎，连接在上下文退出时关闭；SQLite 使用批量表结构迁移。
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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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url = config.get_main_option("sqlalchemy.url")
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if url and "postgresql" in url:
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context.configure(
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connection=connection,
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target_metadata=target_metadata
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)
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else:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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render_as_batch=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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