75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
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"""Alembic 迁移环境。
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**连接串取自 backend/.env**，不写在 alembic.ini —— 避免密码进版本库，
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也避免运行期配置与迁移配置两处漂移。运行期与迁移共用同一份同步连接串
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（驱动 pymysql），不存在同步/异步两套配置。
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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 alembic import context
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from sqlalchemy import engine_from_config, pool
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# 使 `app` 包在 alembic 执行时可导入（alembic 从 backend/ 目录运行）
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sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
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from app.core.config import get_settings
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from app.models import Base
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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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# autogenerate 的比对基准
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target_metadata = Base.metadata
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# 运行期把 .env 里的连接串注入配置，覆盖 alembic.ini 中的占位值
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config.set_main_option(
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"sqlalchemy.url",
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get_settings().database_url.render_as_string(hide_password=False),
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)
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def run_migrations_offline() -> None:
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"""离线模式：不连库，只输出 SQL。
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用于导出 `db/migration/V{n}__*.sql` 留存脚本。
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"""
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context.configure(
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url=config.get_main_option("sqlalchemy.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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# 类型变更也要被识别，否则改列类型不会生成迁移
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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：连库执行迁移。"""
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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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# 迁移是一次性任务，用完即弃，不需要连接池
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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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