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=\somepath\mydb.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=\somepath\mydb.mdb; " & _
"Uid=Admin; " & _
"Pwd=; "
ii)如果使用了System database:
oConn.Open _
"Driver={Microsoft Access Driver (*.mdb)}; " & _
"Dbq=\somepath\mydb.mdb; " & _
"SystemDB=\somepath\mydb.mdw; ", _
"admin ", " "
c)ODBC Driver for SQL Server
i)普通安全模式
oConn.Open "Driver={SQL Server}; " & _