安装Oracle完整客户端后，没有访问接口OraOLEDB.Oracle，是因为Oracle客户端安装时没有往注册表里面写入驱动信息。
注意3里面的路径要换成你客户端安装的路径
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-
00C04FA30080}InprocServer32]中的值：
@="D:\app\client\product\11.2.0\client_1\BIN\OraOLEDB11.DLL"
此值是根据你安装Oracle客户端的路径的值，必须保持一致。
首先要修改一下注册表内容（把1/2/3/4 考下来变成reg格式文件依次执行）：
1、Windows Registry Editor Version 5.00
REGEDIT4
[HKEY_LOCAL_MACHINESOFTWAREClassesOraOLEDB.Oracle]
@="Oracle Provider for OLE DB"
[HKEY_LOCAL_MACHINESOFTWAREClassesOraOLEDB.OracleCLSID]
@="{3F63C36E-51A3-11D2-BB7D-00C04FA30080}"
[HKEY_LOCAL_MACHINESOFTWAREClassesOraOLEDB.OracleCurVer]
@="OraOLEDB.Oracle.1"
2、Windows Registry Editor Version 5.00
REGEDIT4
[HKEY_LOCAL_MACHINESOFTWAREClassesOraOLEDB.Oracle.1]
@="Oracle Provider for OLE DB"
[HKEY_LOCAL_MACHINESOFTWAREClassesOraOLEDB.Oracle.1CLSID]
@="{3F63C36E-51A3-11D2-BB7D-00C04FA30080}"
3、Windows Registry Editor Version 5.00
REGEDIT4
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}]
@="OraOLEDB.Oracle"
"OLEDB_SERVICES"=dword:ffffffff
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}ExtendedErrors]
@="Extended Error Lookup Service"
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}ExtendedErrors{3FC8E6E4-53FF-11D2-BB7D-00C04FA30080}]
@="Oracle OLE DB Error Lookup"
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}InprocServer32]
@="D:\app\client\product\11.2.0\client_1\BIN\OraOLEDB11.DLL"
"ThreadingModel"="Both"
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}OLE DB Provider]
@="Oracle Provider for OLE DB"
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}ProgID]
@="OraOLEDB.Oracle.1"
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}TypeLib]
@="{0BB9AFD1-51A1-11D2-BB7D-00C04FA30080}"
[HKEY_CLASSES_ROOTCLSID{3F63C36E-51A3-11D2-BB7D-00C04FA30080}VersionIndependentProgID]
@="OraOLEDB.Oracle"
4、Windows Registry Editor Version 5.00
REGEDIT4 [HKEY_LOCAL_MACHINESOFTWAREMicrosoftMicrosoft SQL ServerMSSQL10.MSSQLSERVERProvidersOraOLEDB.Oracle] "AllowInProcess"=dword:00000001
转自：https://q.cnblogs.com/q/33850/ 同时感谢这位兄弟。
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