https://support.microsoft.com/zh-cn/help/189897/data-truncated-to-255-characters-with-excel-odbc-driver Microsoft.ACE.OLEDB.12.0 驅動讀取excel,會讀取前8行來斷定每列的數據類型,假如沒有超過255個字符,那麼會被設置爲nvarchar(255),從第9行開始,超過255字符會被自動截斷! 推薦使用第三方庫:https://github.com/ExcelDataReader/ExcelDataReader ---------------------------------- 附鏈接字符串 Microsoft ACE OLEDB 12.0 Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myExcel2007file.xlsx; Extended Properties="Excel 12.0 Xml;HDR=YES"; 驅動下載Microsoft Access Database Engine 2016 Redistributable https://www.microsoft.com/en-us/download/details.aspx?id=54920