从SQL Server中查询ORACLE中的数据，可以在SQL Server中创建到ORACLE的链接服务器来实现的，但是根据32位 、64位的机器和软件，
需要用不同的驱动程序来实现。
在64位的机器上，通过访问接口：OracleProvide for OLE DB，来实现。
1、机器环境和软件环境
操作系统是：windows 7旗舰版 64位，SQL Server 20008R2 64 位，Oracle 11g 11.2.0.1.0 64 位。
2、ORACLE环境的设置
连接oracle，修改scott用户的密码为tiger，并给账户解锁，尝试登录，查询表：
1 C:\Users\Administrator>sqlplus / as sysdba 2 3 SQL*Plus: Release 11.2.0.1.0 Production on 星期四 3月 13 16:11:03 2014 4 5 Copyright (c) 1982, 2010, Oracle. All rights reserved. 6 7 8 连接到: 9 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production 10 With the Partitioning, OLAP, Data Mining and Real Application Testing options 11 12 SQL> alter user scott identified by tiger; 13 14 用户已更改。 15 16 SQL> alter user scott account unlock; 17 18 用户已更改。 19 20 SQL> connect scott/tiger 21 已连接。 22 SQL> select count(*) from emp; 23 COUNT(*) 24 ---------- 25 12
查看listener.ora是否正确：
1 # listener.ora Network Configuration File: D:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora 2 # Generated by Oracle configuration tools. 3 4 5 SID_LIST_LISTENER = 6 (SID_LIST = 7 (SID_DESC = 8 (SID_NAME = CLRExtProc) 9 (ORACLE_HOME = D:\app\Administrator\product\11.2.0\dbhome_1) 10 (PROGRAM = extproc) 11 (ENVS = "EXTPROC_DLLS=ONLY:D:\app\Administrator\product\11.2.0\dbhome_1\bin\oraclr11.dll") 12 ) 13 14 (SID_DESC = 15 (GLOBAL_DBNAME=orcl) 16 (ORACLE_HOME = D:\app\Administrator\product\11.2.0\dbhome_1) 17 (SID_NAME =orcl) 18 ) 19 ) 20 21 22 23 LISTENER = 24 (DESCRIPTION_LIST = 25 (DESCRIPTION = 26 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) 27 ) 28 )
要特别注意里面的：
(SID_DESC =
(GLOBAL_DBNAME=orcl)
(ORACLE_HOME = D:\app\Administrator\product\11.2.0\dbhome_1)
(SID_NAME =orcl)
)
另外，查看tnsnames.ora是否正确：
1 # tnsnames.ora Network Configuration File: D:\app\Administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN\tnsnames.ora 2 # Generated by Oracle configuration tools. 3 4 ORACLR_CONNECTION_DATA = 5 (DESCRIPTION = 6 (ADDRESS_LIST = 7 (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) 8 ) 9 (CONNECT_DATA = 10 (SID = CLRExtProc) 11 (PRESENTATION = RO) 12 ) 13 ) 14 15 LISTENER_orcl = 16 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) 17 18 orcl = 19 (DESCRIPTION = 20 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) 21 (CONNECT_DATA = 22 (SID = orcl) 23 (SERVER = DEDICATED) 24 (SERVICE_NAME = orcl) 25 ) 26 )
特别是：
orcl =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SID = orcl)
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
查看监听器的状态是否正常：
1 SQL> host lsnrctl status 2 3 LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 13-3月 -2014 16:16:21 4 5 Copyright (c) 1991, 2010, Oracle. All rights reserved. 6 7 正在连接到 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))) 8 LISTENER 的 STATUS 9 ------------------------ 10 别名 LISTENER 11 版本 TNSLSNR for 64-bit Windows: Version 11.2.0.1.0 - Production 12 启动日期 13-3月 -2014 13:17:27 13 正常运行时间 0 天 2 小时 58 分 58 秒 14 跟踪级别 off 15 安全性 ON: Local OS Authentication 16 SNMP OFF 17 监听程序参数文件 D:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora 18 监听程序日志文件 d:\app\administrator\diag\tnslsnr\ggg-PC\listener\alert\log.xml 19 监听端点概要... 20 (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521))) 21 服务摘要.. 22 服务 "CLRExtProc" 包含 1 个实例。 23 实例 "CLRExtProc", 状态 UNKNOWN, 包含此服务的 1 个处理程序... 24 服务 "orcl" 包含 1 个实例。 25 实例 "orcl", 状态 UNKNOWN, 包含此服务的 1 个处理程序... 26 命令执行成功
3、设置链接服务器。
需要特别注意的是，数据源orcl指的是：tnsnames.ora文件中的orcl服务名。
第一步，选择“新建链接服务器”
第二步，一定要选择 Oracle Provide for OLE DB
第三步，输入产品：oracle，数据源：orcl
第四步，输入oracle的用户名和密码，这个需要根据实际情况设置，输入完后，点确定就好。
4、测试查询
1 select * from openquery(xxx, 'SELECT * FROM emp')
返回结果：
5、用代码实现：
1 /****** Object: LinkedServer [ORCL_SCOTT] Script Date: 03/13/2014 16:25:21 ******/ 2 EXEC master.dbo.sp_addlinkedserver 3 @server = N'ORCL_SCOTT', 4 @srvproduct=N'oracle', 5 @provider=N'OraOLEDB.Oracle', 6 @datasrc=N'orcl' 7 GO 8 9 /* For security reasons the linked server remote logins password is changed with ######## */ 10 EXEC master.dbo.sp_addlinkedsrvlogin 11 @rmtsrvname=N'ORCL_SCOTT', 12 @useself=N'False', 13 @locallogin=NULL, 14 @rmtuser=N'scott', 15 @rmtpassword='tiger' 16 go 17 18 19 select * from openquery(ORCL_SCOTT, 'SELECT * FROM scott.emp')
还可以用？表示绑定变量：
1 EXEC ( 'SELECT * FROM scott.emp') AT ORCL_SCOTT; 2 GO 3 EXEC ( 'SELECT * FROM scott.emp WHERE MGR = ?', 7902) AT ORCL_SCOTT; 4 GO 5 DECLARE @v INT; 6 SET @v = 7902; 7 EXEC ( 'SELECT * FROM scott.emp WHERE MGR = ?', @v) AT ORCL_SCOTT; 8 GO
6、通过openrowset函数来实现，更简单。
1 select * from openrowset('OraOLEDB.Oracle','orcl';'scott';'tiger','select * from SCOTT.EMP')
返回结果：