2.1数据库创建数据库连接(DBLink)
dblink(Database Link)数据库链接顾名思义就是数据库的链接,就像电话线一样,是一个通道,当我们要跨本地数据库,访问另外一个数据库表中的数据时,本地数据库中就必须要创建远程数据库的dblink,通过dblink本地数据库可以像访问本地数据库一样访问远程数据库表中的数据。
第一步:查询用户是否具备创建DBLink的权限,并赋予权限
(1) select * from user_sys_privs where privilege like upper('%DATABASE LINK%');
(2) grant create public database link,drop public database link to test_1;
第二步:创建DBLink
已经配置本地服务:
create public database link test_others_course
connect to test_others identified by "456"
using'ORCL';
直接建立连接:
create public database link test_others_course
connect to test_others identified by "456"
using'(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.106)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORCL)
)
)';
第三步:查询DLink,删除DBLink
查询DLink(在dba下执行):select * from dba_db_links;
select owner,object_name from dba_objects where object_type='DATABASE LINK';
删除DBLink:drop public database link test_others_course;
第四步:执行DBLink
select * from course@test_others_course;
3.1赋予/移除用户增、删、改、查其他用户所属表权限
3.1.1所有表
(1)grant/revoke update any table to test_1;
(2)grant/revoke insert any table to test_1;
(3)grant/revoke delete any table to test_1;
(4)grant/revoke select any table to test_1;
3.1.2单独表
(1)grant/revoke select on test_2.teacher to test_1;
(2)grant/revoke delete on test_2.teacher to test_1;
(3)grant/revoke insert on test_2.teacher to test_1;
(4)grant/revoke update on test_2.teacher to test_1;
3.1.3查询用户拥有权限
select * from dba_sys_privs where grantee='TEST_1';(用户名要大写)
3.1.3查询用户拥有角色
select * from dba_role_privs where grantee='TEST_1';(用户名要大写)