Oracle通过database link连接到mysql

有1个需要从oracle连到mysql的需求，此采用的database link连过去。以下所有的操作都是oracle机器上完成。
mysql机器保证能连通即可。


机器信息：
两机OS：
CentOS release 6.6 (Final)
Kernel \r on an \m


oracle:11201 64位
mysql：
mysql> select version();
+------------+
| version()  |
+------------+
| 5.5.44-log |
+------------+
1 row in set (0.00 sec)


1.安装相关的软件
[root@db01 Packages]# yum install unixODBC unixODBC-devel
[root@db01 Packages]# yum install mysql-libs mysql-connector-odbc


2.增加以下文件以内容：


[root@db01 ~]# vi /etc/odbc.ini


[test1]
Driver=/usr/lib64/libmyodbc5.so
Server=192.168.12.181
User=root
Password=tan
Port=3306
database=test_box1
CHARSET=UTF8


3.测试odbc连接
[oracle@db01 ~]$ isql test1 -v
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
出现以上结果，说明ok，可以继续往下。


4.oracle中增加静态监听和tnsnames
[oracle@db01 admin]$ more listener.ora  
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (SDU=32767)
      (ADDRESS = (PROTOCOL = TCP)(HOST = db01)(PORT = 1521))
    )
  )


ADR_BASE_LISTENER = /u01/app/oracle


SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SDU=32767)
      (GLOBAL_DBNAME = db01)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
      (SID_NAME = orcl)
    )


    (SID_DESC=
         (SID_NAME=test1)
         (ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1)
         (PROGRAM=dg4odbc)
         (ENVS ="LD_LIBRARY_PATH=/usr/lib64/mysql/:/usr/lib:$ORACLE_HOME/lib:$OR
ACLE_HOME/odbc/lib")
    )
  )
  
[oracle@db01 admin]$ more tnsnames.ora 


 test1  =
  (DESCRIPTION=
    (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521))
    (CONNECT_DATA=(SID=test1))
    (HS=OK)
  )


  --注意：以上tnsnames.ora中填的host是oracle机器的IP
5.配置HS
[oracle@db01 admin]$ pwd
/u01/app/oracle/product/11.2.0/dbhome_1/hs/admin
[oracle@db01 admin]$ more inittest1.ora 
# This is a sample agent init file that contains the HS parameters that are
# needed for the Database Gateway for ODBC


#
# HS init parameters
#
HS_FDS_CONNECT_INFO =test1 
HS_FDS_TRACE_LEVEL = OFF
HS_FDS_SHAREABLE_NAME = /usr/lib64/libodbc.so
HS_LANGUAGE=AMERICAN_AMERICA.UTF8
HS_NLS_NCHAR=UCS2
#
# ODBC specific environment variables
#
set ODBCINI= /etc/odbc.ini


#
#set =--


6.测试以上的配置:
[oracle@db01 admin]$ tnsping test1


TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 22-JUL-2015 10:38:25


Copyright (c) 1997, 2009, Oracle.  All rights reserved.


Used parameter files:




Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION= (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)) (CONNECT_DATA=(SID=test1)) (HS=OK))
OK (30 msec)


7.创建database link
create public database link test1 connect to "root" identified by "tan" using 'test1';


8.进行查询
SQL> select count(*) from "nodes"@test1;


--注意：mysql中的对象需要用引号。