Oracle10g通过DBLink访问MySQL示例

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：

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:

yum install mysql 
yum install mysql.i386 

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。

rpm -qa |grep mysql-connect 

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 

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

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

[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= 

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

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：

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:

create public database link MYSQL 
connect to "mysql username" identified by "mysql pwd" 
using '(DESCRIPTION = 
 (ADDRESS = (PROTOCOL = TCP) (HOST = 127.0.0.1) (PORT =1521) ) 
 (CONNECT_DATA = (SID= test) ) 
 (HS=OK) 
 )'; 

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

select * from "tablename"@test

以上就是Oracle10g通过DBLink访问MySQL示例。问候不一定要慎重其事，但一定要真诚感人。更多关于Oracle10g通过DBLink访问MySQL示例请关注haodaima.com其它相关文章！