数据库使用速记:袖珍数据库连接查询手册
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}; " & _
"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=\somepath\pubs.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=\somepath\mydb.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=\somepath\mydb.mdb; " & _
"User Id=admin; " & _
"Password=; "
ii)如果使用了System database:
oConn.Open _
"Provider=Microsoft.Jet.OLEDB.4.0; " & _
"Data Source=\somepath\mydb.mdb; " & _
"Jet OLEDB:System Database=system.mdw; ", _
"admin ", " "
注意：当使用OLE DB Provider4.0版本是，需要把MDB和MDW文件转换成4.0的数据库格式
iii)如果MDB需要一个数据库密码的话：
oConn.Open _
"Provider=Microsoft.Jet.OLEDB.4.0; " & _
"Data Source=\somepath\mydb.mdb; " & _
"Jet OLEDB:Database Password=MyDbPassword; ", _
"admin ", " "
c)OLE DB Provider for Excel Spreadsheet:
oConn.Open _
"Provider=Microsoft.Jet.OLEDB.4.0; " & _
"Data Source=\somepath\expenses.xls; " & _
"Extended Properties= " "Excel 8.0;HDR=Yes; " "; "
注意： "HDR=Yes "表示在第一行中是行标题，在provider中将不把第一行包括入recordset中
d)OLE DB Provider for SQL Server
i)普通安全模式：
oConn.Open "Provider=sqloledb; " & _
"Network Library=DBMSSOCN; " & _
"Data Source=carl2; " & _
"Initial Catalog=pubs; " & _
"User Id=sa; " & _
"Password=; "
ii)使用信任安全模式：
oConn.Open "Provider=sqloledb; " & _
Network Library=DBMSSOCN; " & _
"Data Source=carl2; " & _
"Initial Catalog=pubs; " & _
"Trusted_Connection=yes; "
注意： "Network Library=DBMSSOCN "声明OLE DB使用TCP/IP替代Named Pipes.
e)OLE DB Provider for Oracle
oConn.Open "Provider=msdaora; " & _
"Data Source=OracleServer.world; " & _
"User Id=sa; " & _
"Password=; "
(VI)Remote OLE DB Provider Connections方式（就是我一直在研究的RDS方式哦，呵呵。）：
a)MS Remote - Access (Jet)
i)ODBC DSN:
oConn.Open "Remote Server=http://carl2; " & _
"Remote Provider=MSDASQL; " & _
"DSN=AdvWorks; " & _
"Uid=admin " & _
"Pwd=; "
ii)OLE DB Provider:
oConn.Open "Provider=MS Remote; " & _
"Remote Server=http://carl2; " & _
"Remote Provider=Microsoft.Jet.OLEDB.4.0; " & _
"Data Source=\somepath\mydb.mdb; ", _
"admin ", " "
iii)OLE DB Provider自定义事务对象
oConn.Open "Provider=MS Remote; " & _
"Remote Server=http://carl2; " & _
"Handler=MSDFMAP.Handler; " & _
"Data Source=MyAdvworksOLEDBConnectTag; "
b)MS Remote - SQL Server
i)ODBC DSN:
oConn.Open "Remote Server=http://carl2; " & _
"Remote Provider=MSDASQL; " & _
"Network Library=DBMSSOCN; " & _
"DSN=Pubs; " & _
"Uid=sa " & _
"Pwd=; "
ii)OLE DB Provider
oConn.Open "Provider=MS Remote; " & _
"Remote Server=http://carl2; " & _
"Remote Provider=SQLOLEDB; " & _
"Network Library=DBMSSOCN; " & _
"Data Source=carl2; " & _
"Initial Catalog=pubs; " & _
"User ID=sa; " & _
"Password=; "
转http://www.chinaitpower.com/A/2001-11-09/4307.html
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