58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
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from sqlalchemy.orm import declarative_base
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from sqlalchemy import text, JSON
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from sqlalchemy.types import TypeDecorator
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from sqlalchemy.dialects.postgresql import JSONB
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from app.config import settings
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class JSONType(TypeDecorator):
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"""A JSON type that uses JSONB on PostgreSQL and JSON on other databases."""
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impl = JSON
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cache_ok = True
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def load_dialect_impl(self, dialect):
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if dialect.name == "postgresql":
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return dialect.type_descriptor(JSONB())
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return dialect.type_descriptor(JSON())
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engine = create_async_engine(
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settings.DATABASE_URL,
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pool_size=10, # 连接池大小
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max_overflow=20, # 最大溢出连接数
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pool_timeout=30, # 等待连接超时（秒）
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pool_recycle=3600, # 连接回收时间（1小时）
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pool_pre_ping=True, # 使用前 ping 检查连接有效性
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echo=False, # 生产环境关闭 SQL echo
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)
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AsyncSessionLocal = async_sessionmaker(
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engine,
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class_=AsyncSession,
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expire_on_commit=False,
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autoflush=False,
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autocommit=False,
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)
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Base = declarative_base()
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async def get_db() -> AsyncSession:
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async with AsyncSessionLocal() as session:
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try:
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yield session
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finally:
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await session.close()
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async def check_db_connection() -> bool:
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"""检查数据库连接是否正常"""
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try:
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async with AsyncSessionLocal() as session:
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await session.execute(text("SELECT 1"))
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return True
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except Exception:
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return False
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