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Oracle10g通过DBLink访问MySQL示例

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1, 首先在Oracle所在计算机安装MySQL的Client端软件,并且x86_64和i386版本的都需要安装,以便可以连接MySQL数据库。查看Client安装情况:

复制代码 代码如下:


rpm -qa |grep mysql
mysql-5.0.45-7.el5
mysql-5.0.45-7.el5

得到两条记录,一条是x86_64的,一条是i386的。
如果看到还没有安装mysql客户端软件,则需要安装:

复制代码 代码如下:


yum install mysql
yum install mysql.i386


验证在此Oracle所在计算机是可以连接目标主机MySQL数据库:

复制代码 代码如下:


mysql -h 192.168.1.1 -u root -p mysql

2, 检查Oracle所在计算机是否已安装MySQL ODBC客户端,并且x86_64和i386版本的都需要安装。

复制代码 代码如下:


rpm -qa |grep mysql-connect


如果没有安装mysql-connector-odbc,则用下面命令下载和安装:
下载 mysql-connector-odbc:

复制代码 代码如下:


wget ftp://mirror.switch.ch/pool/3/mirror/centos/5.2/os/i386/CentO S/mysql-connector-odbc-3.51.12-2.2.i386.rpm


安装mysql-connector-odbc:

复制代码 代码如下:


rpm -ivh mysql-connector-odbc-3.51.12-2.2.i386.rpm


得到提示

复制代码 代码如下:


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

复制代码 代码如下:


vi /etc/odbc.ini

#odbc.ini内容如下

复制代码 代码如下:


[test]
Driver=/usr/lib64/libmyodbc3.so
Description=MySQL
Server=192.168.1.1(MySQL Server IP)
Port=3306
User= (MySQL Username)
UID= (MySQL Username)
Password= (MySQL PWD)
Database= (MySQL Database Name)
Option=3
Socket=


在命令行中执行下列命令,应能够顺利登入MySQL Client窗口,即证明ODBC功能正常:

复制代码 代码如下:


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)

复制代码 代码如下:


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:

复制代码 代码如下:


(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:

复制代码 代码如下:


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:

复制代码 代码如下:


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

Copyright (c) 1991, 2007, Oracle.  All rights reserved.

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:

复制代码 代码如下:

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