Postgresql 赋予用户权限和撤销权限的实例_PostgreSQL_

 alter user wang set default_transaction_read_only=on; grant all on database test to wang; grant select on all database test to wang; grant select on all tables in schema public to wang; // 起作用的是这句 要进入数据库test 操作,在那个db环境执行就授哪个db的权

 ve=# grant all on schema public to foo ; ve=# grant select,insert,update,delete on test to foo ; ve=# grant select,insert,update,delete on public.test to foo ;

 revoke all on database company from wang; #撤销用户wang对数据库company 的所有权限 revoke select on all tables in schema public from wang; 

 lyy=# revoke all on test1 from public; REVOKE lyy=# revoke all on test2 from public; REVOKE

 lyy=# revoke all on pg_class from public; REVOKE lyy=# revoke all on pg_class from yy; REVOKE

 lyy=# ALTER TABLE test1 OWNER TO yy; lyy=# \q

 /* 赋给用户表的所有权限 */ GRANT ALL ON tablename TO user; /* 赋给用户数据库的所有权限 */ GRANT ALL PRIVILEGES ON DATABASE dbname TO dbuser; /* 撤销用户权限 */ REVOKE privileges ON tablename FROM user; 

 /* 创建数据库 */ create database dbname; /* 删除数据库 */ drop database dbname; 

 /* 增加让主键自增的权限 */ grant all on sequence tablename_keyname_seq to webuser; /* 重命名一个表 */ alter table [表名A] rename to [表名B]; /* 删除一个表 */ drop table [表名]; /* 在已有的表里添加字段 */ alter table [表名] add column [字段名] [类型]; /* 删除表中的字段 */ alter table [表名] drop column [字段名]; /* 重命名一个字段 */ alter table [表名] rename column [字段名A] to [字段名B]; /* 给一个字段设置缺省值 */ alter table [表名] alter column [字段名] set default [新的默认值]; /* 去除缺省值 */ alter table [表名] alter column [字段名] drop default; /* 插入数据 */ insert into 表名 ([字段名m],[字段名n],......) values ([列m的值],[列n的值],......); /* 修改数据 */ update [表名] set [目标字段名]=[目标值] where ...; /* 删除数据 */ delete from [表名] where ...; /* 删除表 */ delete from [表名]; /* 查询 */ SELECT * FROM dbname WHERE ...; /* 创建表 */ create table ( [字段名1] [类型1] primary key, 

 postgres=# create user username with password '****';

 postgres=# create database dbtest owner username; -- 创建数据库指定所属者

 postgres=# grant all on database dbtest to username; -- 将dbtest所有权限赋值给username

 psql -U username databasename < /data/dum.sql -- 用户名和数据库名

 lyy=# \c - yy FATAL: Peer authentication failed for user "yy" Previous connection kept

 psql -E -U yy -d lyy Password for user yy: psql: FATAL: permission denied for database "lyy" DETAIL: User does not have CONNECT privilege.

 #grant connect on database lyy to yy;