C#读取Excel,Access数据库
使用 OpenRowSet 和 OpenDataSource 访问 Excel 97-2007 测试文件:D:/97-2003.xls和D:/2007.xlsx,两个文件的内容是一模一样的。 测试环境:SQL Server 2000 / 2005。 接口类型 语法一览 注册表设置 单一数据类型列的类型解析 混合数据类型列的自然解析 混
使用 OpenRowSet 和 OpenDataSource 访问 Excel 97-2007
测试文件:D:/97-2003.xls和D:/2007.xlsx,两个文件的内容是一模一样的。
测试环境:SQL Server 2000 / 2005。
- 接口类型
- 语法一览
- 注册表设置
- 单一数据类型列的类型解析
- 混合数据类型列的自然解析
- 混合数据类型列的强制解析——IMEX=1
- 如何解决 NULL 值问题
- SQL Server 2000 中的列顺序问题
- 如何访问隐藏的 Sheet
- 如何访问非常规命名的 Sheet
- 关于Excel导入的HDR=YES; IMEX=1详解
- C#读取Access数据库
接口类型
有两种接口可供选择:Microsoft.Jet.OLEDB.4.0(以下简称 Jet 引擎)和Microsoft.ACE.OLEDB.12.0(以下简称 ACE 引擎)。
Jet 引擎大家都很熟悉,可以访问 Office 97-2003,但不能访问 Office 2007。
ACE 引擎是随 Office 2007 一起发布的数据库连接组件,既可以访问 Office 2007,也可以访问 Office 97-2003。
另外:Microsoft.ACE.OLEDB.12.0 可以访问正在打开的 Excel 文件,而 Microsoft.Jet.OLEDB.4.0 是不可以的。
Microsoft.ACE.OLEDB.12.0 安装文件:
http://www.microsoft.com/downloads/details.aspx?displaylang=zh-cn&FamilyID=7554f536-8c28-4598-9b72-ef94e038c891
语法一览
使用 Jet 引擎或 ACE 引擎访问,在语法上没有什么的区别。
--> Jet 引擎访问 Excel 97-2003 select * from OpenRowSet('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;HDR=Yes;IMEX=1;Database=D:/97-2003.xls', 'select * from [Sheet1$]') select * from OpenRowSet('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;HDR=Yes;IMEX=1;Database=D:/97-2003.xls', [Sheet1$]) select * from OpenDataSource('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;HDR=Yes;IMEX=1;Database=D:/97-2003.xls')...[Sheet1$] select * from OpenDataSource('Microsoft.Jet.OLEDB.4.0', 'Data Source=D:/97-2003.xls;Extended Properties="Excel 8.0;HDR=Yes;IMEX=1"')...[Sheet1$] --> ACE 引擎访问 Excel 97-2003 select * from OpenRowSet('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;HDR=Yes;IMEX=1;Database=D:/97-2003.xls', 'select * from [Sheet1$]') select * from OpenRowSet('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;HDR=Yes;IMEX=1;Database=D:/97-2003.xls', [Sheet1$]) select * from OpenDataSource('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;HDR=Yes;IMEX=1;Database=D:/97-2003.xls')...[Sheet1$] select * from OpenDataSource('Microsoft.ACE.OLEDB.12.0', 'Data Source=D:/97-2003.xls;Extended Properties="Excel 12.0;HDR=Yes;IMEX=1"')...[Sheet1$] --> ACE 引擎访问 Excel 2007 select * from OpenRowSet('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;HDR=Yes;IMEX=1;Database=D:/2007.xlsx', 'select * from [Sheet1$]') select * from OpenRowSet('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;HDR=Yes;IMEX=1;Database=D:/2007.xlsx', [Sheet1$]) select * from OpenDataSource('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;HDR=Yes;IMEX=1;Database=D:/2007.xlsx')...[Sheet1$] select * from OpenDataSource('Microsoft.ACE.OLEDB.12.0', 'Data Source=D:/2007.xlsx;Extended Properties="Excel 12.0;HDR=Yes;IMEX=1"')...[Sheet1$]
Excel 2007 工作簿文件的扩展名是:xlsx
HDR=Yes/No
可选参数,指定 Excel 表的第一行是否列名,缺省为 Yes,可以在注册表中修改缺省的行为。
IMEX=1
可选参数,将 Excel 表中混合 Intermixed 数据类型的列强制解析为文本。
注册表设置
Microsoft.Jet.OLEDB.4.0
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Jet/4.0/Engines/Excel
Microsoft.ACE.OLEDB.12.0
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Office/12.0/Access Connectivity Engine/Engines/Excel
FirstRowHasNames
设置 HDR 参数的缺省行为,默认为 Yes。
ImportMixedTypes
设置混合列的强制解析类型,默认为文本 Text。
TypeGuessRows
设置用于解析数据类型的取样行数,默认取样前 8 行。如果设置为 0,将分析所有数据行,但不建议这样做,会影响引擎的性能。
注意:Excel 表数据列是单一列数据类型还是混合列数据类型列,是由取样行决定,而不是整列数据决定。
单一数据类型列的类型解析
Sheet1 的内容如下图所示,涵盖了大部分 Excel 的数据类型,其中 longtext 分别有 256 个 A 和 B。

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