update

app/models/coupon.py

@@ -56,6 +56,7 @@ class CouponInfo(BaseModel):
     id: int
     name: str
     amount: float
+    expire_time: datetime
     coupon_type: CouponType
     create_time: datetime
     

app/models/database.py

@@ -1,4 +1,4 @@
-from sqlalchemy import create_engine, event
+from sqlalchemy import create_engine, event, text
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import sessionmaker, scoped_session
 from app.core.config import settings
@@ -22,7 +22,15 @@ engine = create_engine(
     pool_size=10,            # 连接池大小
     max_overflow=20,         # 允许的最大连接数超出pool_size的数量
     pool_timeout=30,         # 获取连接的超时时间（秒）
-    echo_pool=settings.DEBUG # 在调试模式下记录连接池事件
+    echo_pool=settings.DEBUG, # 在调试模式下记录连接池事件
+    # 添加以下参数以增强连接稳定性
+    pool_reset_on_return='commit',  # 在连接返回池时重置连接状态
+    isolation_level='READ COMMITTED',  # 设置事务隔离级别
+    connect_args={
+        'connect_timeout': 10,  # 连接超时时间（秒）
+        'read_timeout': 30,     # 读取超时时间（秒）
+        'write_timeout': 30     # 写入超时时间（秒）
+    }
 )
 
 # 创建线程安全的会话工厂
@@ -59,10 +67,14 @@ def checkout(dbapi_connection, connection_record, connection_proxy):
         # 执行简单查询测试连接
         cursor = dbapi_connection.cursor()
         cursor.execute("SELECT 1")
+        cursor.fetchone()  # 确保实际获取结果
         cursor.close()
     except Exception as e:
-        # 如果连接无效，断开它
+        # 如果连接无效，断开它并尝试重新连接
         logger.warning(f"检测到无效的数据库连接: {str(e)}")
+        # 标记连接为无效
+        connection_record.invalidate()
+        # 强制处理连接池
         connection_proxy._pool.dispose()
         raise
 
@@ -113,7 +125,25 @@ def after_cursor_execute(conn, cursor, statement, parameters, context, executema
 def get_db():
     """获取数据库会话"""
     session_id = threading.get_ident()
-    session = SessionLocal()
+    db = None
+    retry_count = 0
+    max_retries = 3
+    
+    while retry_count < max_retries:
+        try:
+            db = SessionLocal()
+            # 测试连接是否有效
+            db.execute(text("SELECT 1"))
+            break
+        except Exception as e:
+            retry_count += 1
+            if db:
+                db.close()
+            if retry_count >= max_retries:
+                logger.error(f"无法建立数据库连接，已重试 {retry_count} 次: {str(e)}")
+                raise
+            logger.warning(f"数据库连接失败，正在重试 ({retry_count}/{max_retries}): {str(e)}")
+            time.sleep(0.5)  # 短暂延迟后重试
     
     # 记录活跃会话
     with session_lock:
@@ -123,10 +153,11 @@ def get_db():
         }
     
     try:
-        yield session
+        yield db
     finally:
         # 关闭会话并从活跃会话中移除
-        session.close()
+        if db:
+            db.close()
         with session_lock:
             if session_id in active_sessions:
                 del active_sessions[session_id]
@@ -134,9 +165,27 @@ def get_db():
 @contextmanager
 def get_db_context():
     """上下文管理器版本的get_db，用于非依赖项场景"""
-    session = SessionLocal()
+    session = None
+    retry_count = 0
+    max_retries = 3
     session_id = threading.get_ident()
     
+    while retry_count < max_retries:
+        try:
+            session = SessionLocal()
+            # 测试连接是否有效
+            session.execute(text("SELECT 1"))
+            break
+        except Exception as e:
+            retry_count += 1
+            if session:
+                session.close()
+            if retry_count >= max_retries:
+                logger.error(f"无法建立数据库连接，已重试 {retry_count} 次: {str(e)}")
+                raise
+            logger.warning(f"数据库连接失败，正在重试 ({retry_count}/{max_retries}): {str(e)}")
+            time.sleep(0.5)  # 短暂延迟后重试
+    
     # 记录活跃会话
     with session_lock:
         active_sessions[session_id] = {
@@ -148,10 +197,12 @@ def get_db_context():
         yield session
         session.commit()
     except Exception as e:
-        session.rollback()
+        if session:
+            session.rollback()
         raise e
     finally:
-        session.close()
+        if session:
+            session.close()
         with session_lock:
             if session_id in active_sessions:
                 del active_sessions[session_id]