下面将简单介绍一下几种ADO连接方式：ODBC DSN,ODBC DSN-Less,
OLE DB Provider,和"MS Remote" Provider.
1。ODBC DSN连接
I.DSN
oConn.Open "DSN=AdvWorks;" & _
"UID=Admin;" & _
"PWD=;"
注意：从MDAC2.1开始就不能够在使用这样的方式了，就是只把DSN文件名放在ConnectString中
你必须同时使用DSN，UID，PWD标志。例如下面的方式在MDAC 2.1中将会出错：
oConn.Open "AdvWorks"



II.File DSN
oConn.Open "FILEDSN=somepathmydb.dsn;" & _
"UID=Admin;" & _
"PWD=;"
III.ODBC DSN-Less Connections
a)ODBC Text Driver
oConn.Open _
"Driver={Microsoft Text Driver (*.txt; *.csv)};" & _
"Dbq=somepath;" & _
"Extensions=asc,csv,tab,txt;" & _
"Persist Security Info=False"
注意：需要在SQL语句中指定使用到的文件名。例如：
oRs.Open "Select * From customer.csv", _
oConn, adOpenStatic, adLockReadOnly, adCmdText
b)ODBC Driver for Access
i)普通安全模式：
oConn.Open _
"Driver={Microsoft Access Driver (*.mdb)};" & _
"Dbq=somepathmydb.mdb;" & _
"Uid=Admin;" & _
"Pwd=;"
ii)如果使用了System database:
oConn.Open _
"Driver={Microsoft Access Driver (*.mdb)};" & _
"Dbq=somepathmydb.mdb;" & _
"SystemDB=somepathmydb.mdw;", _
"admin", ""
c)ODBC Driver for SQL Server
i)普通安全模式
oConn.Open "Driver={SQL Server};" & _
"Server=carl2;" & _
"Database=pubs;" & _
"Uid=sa;" & _
"Pwd=;"
ii)使用信任安全模式：
oConn.Open "Driver={SQL Server};" & _
"Server=carl2;" & _
"Database=pubs;" & _
"Uid=;" & _
"Pwd=;"
注意：要使用空白的Uid和Pwd
d)ODBC Driver for Oracle
i)使用现有的Oracle ODBC Driver from Microsoft:
oConn.Open _
"Driver={Microsoft ODBC for Oracle};" & _
"Server=OracleServer.world;" & _
"Uid=demo;" & _
"Pwd=demo;"
ii)使用老版本的Oracle ODBC Driver from Microsoft:
oConn.Open _
"Driver={Microsoft ODBC Driver for Oracle};" & _
"ConnectString=OracleServer.world;" & _
"Uid=demo;" & _
"Pwd=demo;"
IIII)使用微软的OLE DB Data Link Connections方式Data Link File (UDL)
a)使用绝对路径
oConn.Open "File Name=somepathpubs.udl;"
b)使用相对路径
oConn.Open "File Name=pubs.udl;"
V)OLE DB Provider Connections方式
a)OLE DB Provider for ODBC Databases
i)Access (Jet):
oConn.Open _
"Provider=MSDASQL;" & _
"Driver={Microsoft Access Driver (*.mdb)};" & _
"Dbq=somepathmydb.mdb;" & _
"Uid=Admin;" & _
"Pwd=;"
ii)SQL Server:
oConn.Open _
"Provider=MSDASQL;" & _
"Driver={SQL Server};" & _
"Server=carl2;" & _
"Database=pubs;" & _
"Uid=sa;" & _
"Pwd=;"
b)OLE DB Provider for Microsoft Jet (Access)
i)普通安全模式：
oConn.Open _
"Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=somepathmydb.mdb;" & _
"User Id=admin;" & _
"Password=;"
ii)如果使用了System