2、ORACLE8I,ORACLE9I的服务器端配置tnsnames.ora, 添加下面的内容: 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后,在命令行下 tnsping pubs tnsping northwind
出现类似提示,即为成功
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)
设置数据库参数global_names=false。
设置global_names=false不要求建立的数据库链接和目的数据库的全局名称一致。global_names=true则要求, 多少有些不方便。
oracle9i和oracle8i都可以在DBA用户下用SQL命令改变global_names参数
alter system set global_names=false;
建立公有的数据库链接:
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’; (假设SQL Server下pubs和northwind已有足够权限的用户登陆testuser, 密码为testuser_pwd)
访问SQL Server下数据库里的数据:
select * from stores@pubs; ...... ...... select * from region@northwind; ...... ......
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) )
sqlserver_databaseid一致才行. |