程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 數據庫知識 >> Oracle數據庫 >> Oracle數據庫基礎 >> 在Oracle裡設置訪問多個SQL Server

在Oracle裡設置訪問多個SQL Server

編輯:Oracle數據庫基礎

如何在Oracle裡設置訪問多個SQL Server數據庫?假設我們要在Oracle裡同時能訪問SQL Server裡默認的pubs和Northwind兩個數據庫。

1、在安裝了ORACLE9i Standard Edition或者ORACLE9i Enterprise Edition的Windows機器上(IP:192.168.0.2), 產品要選了透明網關(Oracle Transparent Gateway)裡訪問Microsoft SQL Server數據庫

$ORACLE9I_HOME\tg4msql\admin下新寫initpubs.ora和initnorthwind.ora配置文件.
initpubs.ora內容如下:
HS_FDS_CONNECT_INFO="SERVER=SQLSERVER_HOSTNMAE;DATABASE=pubs"
HS_DB_NAME=pubs
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
initnorthwind.ora內容如下:
HS_FDS_CONNECT_INFO="SERVER=sqlserver_hostname;DATABASE=Northwind"
HS_DB_NAME=Northwind
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER

$ORACLE9I_HOME\network\admin 下listener.ora內容如下:
LISTENER =
  (DESCRIPTION_LIST =
   (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
  )
  )
  )

SID_LIST_LISTENER =
  (SID_LIST =
  (SID_DESC =
  (GLOBAL_DBNAME = test9)
  (ORACLE_HOME = d:\oracle\ora92)
  (SID_NAME = test9)
 )
  (SID_DESC=
  (SID_NAME=pubs)
  (ORACLE_HOME=d:\Oracle\Ora92) 
  (PROGRAM=tg4msql)
  )
  (SID_DESC=
  (SID_NAME=northwind)
  (ORACLE_HOME=d:\Oracle\Ora92) 
 (PROGRAM=tg4msql)
    )
  )

重啟動這台做gateway的Windows機器上(IP:192.168.0.2)TNSListener服務.

(凡是按此步驟新增可訪問的SQL Server數據庫時,TNSListener服務都要重啟動)

2、ORACLE8I,Oracle9I的服務器端配置tnsnames.ora, 添加下面的內容:

pubs =
  (DESCRIPTION =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
    )
    (CONNECT_DATA =
    (SID = pubs)
    )
    (HS = pubs) 
   )
   
northwind =
  (DESCRIPTION =
  (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
    )
    (CONNECT_DATA =
    (SID = northwind)
    )
    (HS = northwind) 
   )   
 保存tnsnames.ora後,在命令行下
 tnsping pubs
 tnsping northwind

出現類似提示,即為成功

Attempting to contact (DESCRIPTION = (ADDRESS_LIST = 
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)
(PORT = 1521))) (CONNECT_DATA = (SID = pubs)) (HS = pubs))
OK(20毫秒)
Attempting to contact (DESCRIPTION = (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)
(PORT = 1521))) (CONNECT_DATA = (SID = northwind)) (HS = northwind))
OK(20毫秒)

設置數據庫參數global_names=false。

設置global_names=false不要求建立的數據庫鏈接和目的數據庫的全局名稱一致。global_names=true則要求, 多少有些不方便。

oracle9i和Oracle8i都可以在DBA用戶下用SQL命令改變global_names參數

alter system set global_names=false;

建立公有的數據庫鏈接:

create public database link pubs 
connect to testuser identified by testuser_pwd using 'pubs';
create public database link northwind 
connect to testuser identifIEd by testuser_pwd using 'northwind';
(假設SQL Server下pubs和northwind已有足夠權限的用戶登陸testuser,
密碼為testuser_pwd)

訪問SQL Server下數據庫裡的數據:

select * from stores@pubs;
...... 	......
select * from region@northwind;
......  ......

3、使用時的注意事項

Oracle通過訪問SQL Server的數據庫鏈接時,用select * 的時候字段名是用雙引號引起來的。

例如:

create table stores as select * from stores@pubs;
select zip from stores;
ERROR 位於第 1 行:
ORA-00904: 無效列名
select "zip" from stores;
zip
-----
98056
92789
96745
98014
90019
89076

已選擇6行。

用SQL Navigator或Toad看從SQL Server轉移到Oracle裡的表的建表語句為:

CREATE TABLE stores
    ("stor_id"                      CHAR(4) NOT NULL,
    "stor_name"                    VARCHAR2(40),
    "stor_address"                 VARCHAR2(40),
    "city"                         VARCHAR2(20),
    "state"                        CHAR(2),
    "zip"                          CHAR(5))
  PCTFREE     10
  PCTUSED     40
  INITRANS    1
  MAXTRANS    255
  TABLESPACE  users
  STORAGE   (
    INITIAL     131072
    NEXT        131072
    PCTINCREASE 0
    MINEXTENTS  1
    MAXEXTENTS  2147483645
  )
/

總結:

Windows下ORACLE9i網關服務器在$Oracle9I_HOME\tg4msql\admin目錄下的initsqlserver_databaseid.ora

Windows下Oracle9i網關服務器listener.ora裡面

(SID_DESC=
     		(SID_NAME=sqlserver_databaseid)
      		(ORACLE_HOME=d:\Oracle\Ora92) 
      		(PROGRAM=tg4msql)
   	)
   	UNIX或Windows下ORACLE8I,Oracle9I服務器tnsnames.ora裡面
	northwind =
	  (DESCRIPTION =
(ADDRESS_LIST =
	(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
	    )
	(CONNECT_DATA =
	(SID = sqlserver_databaseid)
    		)
	(HS = sqlserver_databaseid) 
   	   )

sqlserver_databaseid一致才行.

  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved