推荐回答（1个）
1、基本上所有的数据库都有对应的写法（有些数据库是要装连接驱动才能连），比如"Provider=Microsoft.Jet.OLEDB.4.0（用来连接access）或者provider =MSDASQL，而且每种数据库也可能会有多种连接方法（Provider意即数据库引擎），常见的有下面这些
Provider 代码 Provider
ADSDSOObject Active Directory Services
Microsoft.Jet.OLEDB.4.0 Microsoft Jet databases
MSDAIPP.DSO.1 Microsoft Internet Publishing
MSDAORA Oracle databases
MSDAOSP Simple text files
MSDASQL Microsoft OLE DB provider for ODBC
MSDataShape Microsoft Data Shape
MSPersist Locally saved files
SQLOLEDB Microsoft SQL Server
2、参见http://www.w3school.com.cn/ado/met_conn_open.asp#connectoptionenum
3、这样就可以对book1.xlsx中的数据使用sql语法进行操作
4、当你需要返回结果的，比如说你要查询数据库符合某个条件的有几条记录，或者说取出数据库中符合条件的一批记录的时候就要用数据集，单一的conn.execute只能执行操作，不能返回数据，必须配合结果集使用才可取回数据。
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