PostgreSQL 序列增删改案例
程序员文章站
2022-04-02 10:11:08
创建序列create sequence if not exists test_mergetable_id_seqincrement 1minvalue 1maxvalue 999999999start...
创建序列
create sequence if not exists test_mergetable_id_seq increment 1 minvalue 1 maxvalue 999999999 start 1 cache 1; //或者: create sequence if not exists test_mergetable_id_seq increment by 1 minvalue 1 no maxvalue start with 1;
指定序列(给表的主键指定创建好的序列)
alter table test_mergetable alter column "i_id" set default nextval('test_mergetable_id_seq');
设置序列自增长从当前最大值开始
select setval('test_mergetable_id_seq', (select max(i_id) from test_mergetable)); alter sequence test_mergetable_id_seq start with 12;
删除序列
drop sequence if exists test_mergetable_id_seq
查看序列
select nextval('test_mergetable_id_seq')
补充:pgsql的schema对用户授权,单个用户跨schema增删改查操作
--创建用户
create user user1;
--修改密码
alter user report with password 'password';
--授权查询权限
grant usage on schema schema1 to user1; grant usage on schema schema2 to user1;
修改search_path可跨schema操作
set search_path = "$user",user1,user2
--授权schema:schema1给user1权限 这个权限太大需要慎用
grant all on schema schema1 to user1;
--授权schema的表权限给user1 用户权限太多需慎用
grant all on all tables in schema schema1 to user1;
--授权schema的表权限给user1 用户权限太多需慎用
grant all on all tables in schema schema1 to user1;
--授权某个schema的单个表查权限
grant select on schema2.table1 to user1;
--收回所有授权
revoke all on all tables in schema schema1 from user1;
--为某个特定用户设置search_path
alter user user1 set search_path="$user",user1,user2;
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。如有错误或未考虑完全的地方,望不吝赐教。
下一篇: 360首次发布智慧城市安全战略