create database link test connect to mall identified by test using '
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 113.116.216.60)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)
';
2.创建同义词
create or replace synonym store for sale_record@mall;
执行以下sql可以查看远程数据库对应表的内容：
select * from store;
3.创建表，索引
create table sale_record(
id int primary key,
storeId int not null,
saledate date not null,
productId int,
num varchar(30) not null
);
CREATE SEQUENCE sale_record_seq
INCREMENT BY 1 -- 每次加几个
START WITH 1000000000 -- 从1开始计数
NOMAXvalue -- 不设置最大值
NOCYCLE -- 一直累加，不循环
CACHE 10;
4.创建触发器
create or replace trigger addSaleRecords
before insert on sale_record
for each row
declare
-- local variables here
v_ID varchar(10);
v_storeId number(10);
v_saledate date;
v_productId number(10);
v_num varchar(40);
begin
select sale_record_seq.nextval into :new.id from dual;
v_ID := :new.id;
v_storeId := :new.storeId;
v_saledate := :new.saledate;
v_productId := :new.productId;
v_num := :new.num;
insert into sale_record@mall(id, storeId, saledate, productId, num) values(v_ID, v_storeId, v_saledate, v_productId, v_num);
end addSaleRecords;
测试：
在本地表中添加数据：
insert into sale_record(id, storeId, saledate, productId, num) values(sale_record_seq.nextval,10000001, '2013-12-12 12:12:12', 900000001, 11);
commit;
执行：
SQL> conn test/test@113.116.216.60:1521/orcl
SQL> select * from sale_record
可以看到远程数据库中也被添加了同样的一条数据。
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