import contextlib
class DatabaseConnectionPool:
def __init__(self):
self.connections = []
def get_connection(self):
# 模拟获取连接逻辑
if self.connections:
return self.connections.pop()
else:
raise Exception("No available connection in pool")
def return_connection(self, conn):
self.connections.append(conn)
@contextlib.contextmanager
def connection_manager(pool):
try:
conn = pool.get_connection()
try:
yield conn
# 没有异常,提交事务
conn.commit()
except Exception as e:
# 发生异常,回滚事务
conn.rollback()
raise e
finally:
pool.return_connection(conn)
except Exception as e:
# 获取连接失败处理
print(f"Failed to get connection: {e}")
# 示例使用
pool = DatabaseConnectionPool()
with connection_manager(pool) as conn:
# 使用conn进行数据库操作
pass