一、環境 OS：Linux myhostname 2.6.9-42.ELsmp #1 SMP Sat Aug 12 09:39:11 CDT 2006 i686 i686 i386 GNU/Linux
CentOS release 4.4 (Final)
Oracle：Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod，數據庫已經安裝好
mysql：5.1.34-community for windows
二、安裝配置 1. 安裝unixODBC，用root用戶
rpm -Uvh unixODBC-2.2.12-1.el4s1.1.i386.rpm
2. 安裝mysql ODBC，用root用戶
rpm -Uvh mysql-connector-odbc-5.1.5-0.i386.rpm
3. 安裝oracle gateway，用oracle用戶
我裝的是10201_gateways_linux32.zip
unzip 10201_gateways_linux32.zip
cd gateways
./runInstaller
安裝方法和oracle db 軟件一樣，我把gateway和db裝一起了，共用一個OracleHOME
4. 配置/etc/odbc.ini
[DSName]
Driver =/usr/lib/libmyodbc5.so
Description =MySQL
Server =xxx.xxx.xxx.xxx
Port =3306
User =root
UID =root
Password = mypass
Database =mysqldbname
Option =3
Socket =
charset =utf8
測試ODBC
isql -v DSName root mypass
5. 配置$ORACLE_HOME/hs/admin/initDSName.ora
HS_FDS_CONNECT_INFO = DSName
HS_FDS_TRACE_LEVEL = 0
HS_FDS_SHAREABLE_NAME = /usr/lib/libmyodbc5.so
6. 配置listener.ora，加紅色部分
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /usr/u01/app/oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = BOSS)
(ORACLE_HOME = /usr/u01/app/oracle/product/10.2.0/db_1)
(SID_NAME = BOSS)
)
(SID_DESC =
(SID_NAME = phpcms)
(ORACLE_HOME = /usr/u01/app/oracle/product/10.2.0/db_1)
(PROGRAM = hsodbc)
)
)
7. 配置tnsnames.ora，添加
DSName =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.125)(PORT = 1521))
)
(CONNECT_DATA = (SERVICE_NAME = DSName))
(HS = OK)
)
8. 重啟監聽器並測試
lsnrctl reload
lsnrctl service
Service "DSName" has 1 instance(s).
Instance "DSName", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:3 refused:0
LOCAL SERVER
The command completed successfully
tnsping DSName
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.125)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = DSName)) (HS = OK))
OK (0 msec)
9. 建立dblink
CREATE PUBLIC DATABASE LINK linkname
CONNECT TO "root"
IDENTIFIED BY <PWD>
USING 'DSName';
10. 測試
select "name" from t1@linkname;
三、遺留問題 1. 字符集問題，最好oracle和mysql是utf8，否則中文有問題
2. text字段會報錯：
select "textcol" from t1@linkname;
ORA-28500: 連接 ORACLE 到非 Oracle 系統時返回此信息:
[Generic Connectivity Using ODBC][MySQL][ODBC 5.1 Driver][mysqld-5.1.34-community]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '"t1" WHERE "id"=1' at line 1 (SQL State: 37000; SQL Code: 1064)
ORA-02063: 緊接著 2 lines (起自 DSName)
本來想用datadirect的mysql ODBC試試，可只支持mysql enterprise版本，實在不好找，以後有機會再說吧。
