1)版本資訊：
Oracle: 11.2.0.4.0 OS: CentOS 7.5
MySQL: 5.7.24 OS: Redhat 6.8
2)檢視dg4odbc版本位數
$ file $ORACLE_HOME/bin/dg4odbc
3)下載下傳并安裝ODBC Driver Manager
$ wget http://sourceforge.net/projects/unixodbc/files/unixODBC/2.2.14/unixODBC-2.2.14-linux-x86-64.tar.gz/download
$ tar -zxvf unixODBC-2.2.14-linux-x86-64.tar.gz
$ mkdir -p ~/app/unixodbc-2.2.14
$ mv usr ~/app/unixodbc-2.2.14
4)下載下傳并按照ODBC Driver for MySQL
$ wget http://dev.mysql.com/get/Downloads/Connector-ODBC/5.2/mysql-connector-odbc-5.2.5-linux-glibc2.5-x86-64bit.tar.gz/from/http://cdn.mysql.com/
$ tar -zxvf mysql-connector-odbc-5.2.5-linux-glibc2.5-x86-64bit.tar.gz
$ mv mysql-connector-odbc-5.2.5-linux-glibc2.5-x86-64bit ~/app
$ cd ~/app
$ ln -s mysql-connector-odbc-5.2.5-linux-glibc2.5-x86-64bit myodbc-5.2.5
5)配置ODBC Driver
$ mkdir ~/etc
$ vi ~/etc/odbc.ini --添加如下行
[myodbc5]
Driver = /home/oracle/app/myodbc-5.2.5/lib/libmyodbc5w.so
Description = Connector/ODBC 5.2 Driver DSN
SERVER = 192.168.8.68
PORT = 3306
USER = user_test
PASSWORD = user_test_pwd
DATABASE = db_test
OPTION = 0
TRACE = OFF
6)驗證之前ODBC配置
$ export ODBCINI=/home/oracle/etc/odbc.ini
$ export LD_LIBRARY_PATH=/home/oracle/app/unixodbc-2.2.14/usr/local/lib:$LD_LIBRARY_PATH
$ cd ~/app/unixodbc-2.2.14/usr/local/bin
$ ./isql myodbc5 -v --no errors and show SQL> prompt
--注:
1)如果報出如下錯誤:mysql: error while loading shared libraries: libreadline.so.5: cannot open shared object file: No such file or directory。可通過如下方法解決。
# yum install readline-devel readline
# ll *libreadline*
# ln -s ../../lib64/libreadline.so.6 libreadline.so.5
# ll *libreadline*
7)配置listener for mysql
vi $ORACLE_HOME/network/admin/listener.ora --添加如下行
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(SID_NAME=myodbc5)
(ORACLE_HOME=/u01/oracle/app/product/11.2.0/dbhome_1)
(PROGRAM=dg4odbc)
(ENVS=LD_LIBRARY_PATH=/home/oracle/app/unixodbc-2.2.14/usr/local/lib:/u01/oracle/app/product/11.2.0/dbhome_1)
)
)
8)配置tnsname for mysql
$ vi $ORACLE_HOME/network/admin/tnsnames.ora --添加如下行
myodbc5 =
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP) (HOST=localhost) (PORT=1521)
)
(CONNECT_DATA=
(SID=myodbc5)
)
(HS=OK)
)
9)建立init.ora for myodbc5
$ vi $ORACLE_HOME/hs/admin/initmyodbc5.ora --添加如下行
HS_FDS_CONNECT_INFO=myodbc5 # Data source name in odbc.ini
HS_FDS_SHAREABLE_NAME=/home/oracle/app/unixodbc-2.2.14/usr/local/lib/libodbc.so
HS_FDS_SUPPORT_STATISTICS=FALSE
HS_LANGUAGE=AMERICAN_AMERICA.WE8ISO8859P15
# ODBC env variables
set ODBCINI=/home/oracle/etc/odbc.ini
10)使上述配置生效并驗證
lsnrctl reload
lsnrctl status
tnsping myodbc5
11)建立dblink并驗證通路
$sqlplus / as sysdba
SQL> create public database link mysqltest connect to "user_test" identified by "user_test_pwd" using 'myodbc5';
SQL> select * from t1@mysqltest;
--注：
1)如果報錯，可為表名添加雙引号，例如：
select * from "t1"@mysqltest;
insert into "t1"@mysqltest values(...);
參考文檔：Detailed Overview of Connecting Oracle to MySQL Using DG4ODBC Database Link (Doc ID 1320645.1)