Oracle10g通过DBLink访问MySQL示例 - 主机乐

libltdl.so.3 is needed by mysql-connector-odbc-3.51.12-2.2.i386 ，发现需要安装libtool的i386版本，因此通过如下命令安装libtool-ltdl.i386：
yum list *.i386|grep libtool
yum install libtool-ltdl.i386

3, 在Oracle所在计算机编辑/etc/odbc.ini文件,测试ODBC工作

vi /etc/odbc.ini

#odbc.ini内容如下

isql -v test
quit

4, 编辑hs配置文件 vi /ora10g/hs/admin/inittest.ora(注意文件名中蓝色部分为odbc.ini中蓝色名称)

HS_FDS_CONNECT_INFO = test
HS_FDS_TRACE_LEVEL = on（正式使用后，不需要排错的时候应设为off）
HS_FDS_TRACE_FILE_NAME = test.trc
HS_FDS_SHAREABLE_NAME=/usr/lib/libmyodbc3.so
set ODBCINI=/etc/odbc.ini

5, 编辑Oracle所在计算机的Oracle listener的配置文件，建立一个模拟Oracle Listener的监听方式,为将来建立dblink做准备：

vi /ora10g/network/admin/listener.ora 加入如下语句：

(SID_DESC =
   (SID_NAME = test)
   (ORACLE_HOME = /ora10g)
   (PROGRAM = hsodbc)
   (ENVS=LD_LIBRARY_PATH=/ora10g/lib32:/usr/lib64:/ora10g/lib)
)

listener.ora文件现在的内容变成：

SID_LIST_LISTENER = (
     SID_LIST =
        (SID_DESC =
           (ORACLE_HOME = /ora10g)
           (PROGRAM = extproc)
           (GLOBAL_DBNAME=prod)
           (SID_NAME=prod)
         )
        (SID_DESC =
                  (SID_NAME = test)
                  (ORACLE_HOME = /ora10g)
                  (PROGRAM = hsodbc)
                  (ENVS=LD_LIBRARY_PATH=/ora10g/lib32:/usr/lib64:/ora10g/lib)
             )
)
LISTENER = (
     DESCRIPTION_LIST =
        (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
                                 (ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521)) )
)

执行lsnrctl reload使Listener生效：

su – oracle
lsnrctl reload
LSNRCTL for Linux: Version 10.2.0.4.0 – Production on 09-FEB-2009 13:59:38 Copyright (c) 1991, 2007, Oracle.
All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
The command completed successfully
lsnrctl status
LSNRCTL for Linux: Version 10.2.0.4.0 – Production on 12-FEB-2009 08:56:00

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
————————
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 10.2.0.4.0 – Production
Start Date                03-JAN-2009 03:47:39
Uptime                    40 days 5 hr. 8 min. 20 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /ora10g/network/admin/listener.ora
Listener Log File         /ora10g/network/log/listener.log
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=0.0.0.0)(PORT=1521)))
Services Summary…
Service “PLSExtProc” has 1 instance(s).
Instance “PLSExtProc”, status UNKNOWN, has 1 handler(s) for this service…
Service “test” has 1 instance(s).
Instance “test”, status UNKNOWN, has 1 handler(s) for this service…
The command completed successfully

6, 编辑Oracle所在计算机中的tnsnames.ora文件，便于建立dblink。注意，此tnsnames的配置可以支持tnsping,但是不能支持sqlplus登录，只用于dblink：

vi /ora10g/network/admin/tnsnames.ora
test =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SID = test)
    )
      (HS = OK)
)

7, 在Oracle Database建立dblink:

using ‘(DESCRIPTION =
              (ADDRESS = (PROTOCOL = TCP) (HOST = 127.0.0.1) (PORT =1521) )
              (CONNECT_DATA = (SID= test) )
              (HS=OK)
           )’;

要注意用户名和密码处需要用双引号，否则Oracle所传输的都是大写字母，可能无法登录进入MySQL。

8, 由于MySQL中的表名的大小写敏感，因此需要在进行SQL查询时对表名用双引号扩起来

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