流程分四段：第一段用 pandas.read_excel 把表格读成 DataFrame，同时做列名清洗和类型推断；第二段用 pyodbc 建立到 SQL Server 的连接，连接串里包含服务器、库名、驱动版本；第三段做字段映射，把 pandas 的 dtype 翻译成 SQL Server 的列类型，生成建表语句；第四段用参数化 executemany 批量插入，包在一个事务里，失败就回滚。

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