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# +======================================================================
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# | 模块: Alembic 迁移环境
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# | 说明: 配置数据库连接与模型 metadata,支持离线/在线两种迁移模式
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# +======================================================================
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"""Alembic 迁移环境。
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- 数据库 URL 取自 src.config.database.DATABASE_URL
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- 自动聚合 src.modules.*.models 中注册的模型 metadata,支持 autogenerate
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"""
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# ----------------------------------------------------------------------
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# 导入依赖
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# 涵盖:模块搜索路径、日志配置、路径处理、SQLAlchemy 引擎与连接池、
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# Alembic 上下文
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# ----------------------------------------------------------------------
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import sys
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from logging.config import fileConfig
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from pathlib import Path
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from sqlalchemy import create_engine, pool
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from alembic import context
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# ============================================================
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# 将 src 目录加入 sys.path
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# ============================================================
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# 将 src 目录加入 sys.path,确保可直接 import 项目代码
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ROOT = Path(__file__).resolve().parent.parent
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SRC = ROOT / "src"
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if str(SRC) not in sys.path:
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sys.path.insert(0, str(SRC))
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from config.database import DATABASE_URL
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# ============================================================
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# 聚合全部模型 metadata
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# ============================================================
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# 聚合全部模型 metadata(导入各模块 models 即完成注册)
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from extensions.sqlalchemy import Base
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import modules.auth.models
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import modules.user.models
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import modules.user_role.models
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import modules.role.models
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import modules.role_menu.models
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import modules.menu.models
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import modules.dept.models
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import modules.category.models
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import modules.article.models
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import modules.param.models
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import modules.file_template.models
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import modules.job.models
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import modules.dictionary.dict.models
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import modules.dictionary.dict_item.models
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import modules.configuration.config.models
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import modules.configuration.config_item.models
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import modules.level.models
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import modules.position.models
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import modules.city.models
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import modules.notice.models
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import modules.link.models
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import modules.operation_log.models
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import modules.login_log.models
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import modules.job_log.models
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import modules.example.models
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# ============================================================
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# 读取 Alembic 配置
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# ============================================================
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# 读取 alembic.ini 中的配置
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config = context.config
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# 存在配置文件时加载其日志配置
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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 metadata(autogenerate 依据)
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target_metadata = Base.metadata
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# 数据库 URL
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database_url = DATABASE_URL
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# ======================================================================
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# 离线模式:仅生成 SQL 脚本
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# ======================================================================
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def run_migrations_offline() -> None:
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"""离线模式:仅生成 SQL 脚本。"""
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context.configure(
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url=database_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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with context.begin_transaction():
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context.run_migrations()
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# ======================================================================
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# 在线模式:直接执行迁移
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# ======================================================================
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def run_migrations_online() -> None:
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"""在线模式:直接执行迁移。"""
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# NullPool:迁移结束后即释放连接,无需连接池
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connectable = create_engine(database_url, poolclass=pool.NullPool)
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with connectable.connect() as connection:
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context.configure(connection=connection, target_metadata=target_metadata)
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with context.begin_transaction():
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context.run_migrations()
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# ============================================================
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# 入口:按模式执行
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# ============================================================
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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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