我要评论安装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_root\clsid\{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_machine\software\classes\oraoledb.oracle]
@="oracle provider for ole db"
[hkey_local_machine\software\classes\oraoledb.oracle\clsid]
@="{3f63c36e-51a3-11d2-bb7d-00c04fa30080}"
[hkey_local_machine\software\classes\oraoledb.oracle\curver]
@="oraoledb.oracle.1"2、windows registry editor version 5.00
regedit4
[hkey_local_machine\software\classes\oraoledb.oracle.1]
@="oracle provider for ole db"
[hkey_local_machine\software\classes\oraoledb.oracle.1\clsid]
@="{3f63c36e-51a3-11d2-bb7d-00c04fa30080}"3、windows registry editor version 5.00
regedit4
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}]
@="oraoledb.oracle"
"oledb_services"=dword:ffffffff
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\extendederrors]
@="extended error lookup service"
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\extendederrors\{3fc8e6e4-53ff-11d2-bb7d-00c04fa30080}]
@="oracle ole db error lookup"
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\inprocserver32]
@="d:\\app\\client\\product\\11.2.0\\client_1\\bin\\oraoledb11.dll"
"threadingmodel"="both"
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\ole db provider]
@="oracle provider for ole db"
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\progid]
@="oraoledb.oracle.1"
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\typelib]
@="{0bb9afd1-51a1-11d2-bb7d-00c04fa30080}"
[hkey_classes_root\clsid\{3f63c36e-51a3-11d2-bb7d-00c04fa30080}\versionindependentprogid]
@="oraoledb.oracle"4、windows registry editor version 5.00
regedit4 [hkey_local_machine\software\microsoft\microsoft sql server\mssql10.mssqlserver\providers\oraoledb.oracle] "allowinprocess"=dword:00000001
转自：https://q.cnblogs.com/q/33850/ 同时感谢这位兄弟。
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