shangfangjian
1219b4fd18
- env.py: 自动创建 alembic_version 表时使用 VARCHAR(255) 避免截断 - docker-compose: 添加 frontend nginx 服务 + alembic 挂载 - nginx.conf: SPA 路由 + API 代理
83 lines
2.5 KiB
Python
83 lines
2.5 KiB
Python
from logging.config import fileConfig
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import sys
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from pathlib import Path
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from sqlalchemy import engine_from_config, pool, text
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from alembic import context
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# 把项目根加入 pythonpath,让 alembic 能找到 src 包
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sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
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from src.db.base import Base # noqa: E402
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from src.db.models import * # noqa: E402,F401,F403 # 导入所有模型确保注册
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from src.core.config import settings # noqa: E402
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# this is the Alembic Config object
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config = context.config
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# 用 settings 的 DATABASE_URL,但转成 sync 驱动
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DB_URL = settings.DATABASE_URL
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if DB_URL.startswith("postgresql+asyncpg"):
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DB_URL = DB_URL.replace("postgresql+asyncpg", "postgresql+psycopg2", 1)
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config.set_main_option("sqlalchemy.url", DB_URL)
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# Interpret the config file for Python logging.
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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 _ensure_version_table(connection):
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"""确保 alembic_version 表存在且 version_num 列足够长。
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Alembic 默认 version_num 是 String(32),但我们的迁移名较长(如
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0005_prediction_status_and_stats_provenance 有 41 个字符),会导致
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StringDataRightTruncation 错误。
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"""
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result = connection.execute(text(
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"SELECT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'alembic_version')"
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))
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if not result.scalar():
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connection.execute(text(
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"CREATE TABLE alembic_version (version_num VARCHAR(255) NOT NULL PRIMARY KEY)"
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))
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connection.commit()
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def run_migrations_offline() -> None:
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"""Run migrations in 'offline' mode."""
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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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)
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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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"""Run migrations in 'online' mode."""
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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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_ensure_version_table(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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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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