如何在Oracle里设置访问多个SQL Server数据库?假设我们要在Oracle里同时能访问SQL Server里默认的pubs和Northwind两个数据库。
3、使用时的注意事项:
ORACLE通过访问SQL Server的数据库链接时,用select * 的时候字段名是用双引号引起来的。
例如:
create table stores as select * from stores@pubs;
select zip from stores;
ERROR 位于第 1 行:
ORA-00904: 无效列名
select "zip" from stores;
zip
-----
98056
92789
96745
98014
90019
89076 |
已选择6行,用SQL Navigator或Toad看从SQL Server转移到ORACLE里的表的建表语句为:
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
) |
总结:
Windows下Oracle9i网关服务器在$Oracle9i_HOME\tg4msql\admin目录下的initsqlserver_databaseid.ora。Windows下Oracle9i网关服务器listener.ora里面:
(SID_DESC=
(SID_NAME=sqlserver_databaseid)
(ORACLE_HOME=d:\Oracle\Ora92)
(PROGRAM=tg4msql)
) |
UNIX或WINDOWS下ORACLE8I,ORACLE9I服务器tnsnames.ora里面:
northwind =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
)
(CONNECT_DATA =
(SID = sqlserver_databaseid)
)
(HS = sqlserver_databaseid)
) |
需要sqlserver_databaseid一致才行。