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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 database:
oconn.open _
"provider=microsoft.jet.oledb.4.0;" & _
"data source=somepathmydb.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=somepathmydb.mdb;" & _
"jet oledb:database password=mydbpassword;", _
"admin", ""
c)ole db provider for excel spreadsheet:
oconn.open _
"provider=microsoft.jet.oledb.4.0;" & _
"data source=somepathexpenses.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=somepathmydb.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=;"
