information_schema.table_privileges表记录着所有用户的权限信息。
postgres=# \d+ information_schema.table_privileges View "information_schema.table_privileges" Column | Type | Modifiers | Storage | Description ----------------+-----------------------------------+-----------+----------+------------- grantor | information_schema.sql_identifier | | extended | 授权者 grantee | information_schema.sql_identifier | | extended | 被授权者 table_catalog | information_schema.sql_identifier | | extended | 数据库名 table_schema | information_schema.sql_identifier | | extended | schema名 table_name | information_schema.sql_identifier | | extended | 表名 privilege_type | information_schema.character_data | | extended | 对表的操作权限 is_grantable | information_schema.yes_or_no | | extended | with_hierarchy | information_schema.yes_or_no | | extended | View definition: SELECT u_grantor.rolname::information_schema.sql_identifier AS grantor, grantee.rolname::information_schema.sql_identifier AS grantee, current_database()::information_schema.sql_identifier AS table_catalog, nc.nspname::information_schema.sql_identifier AS table_schema, c.relname::information_schema.sql_identifier AS table_name, c.prtype::information_schema.character_data AS privilege_type, CASE WHEN pg_has_role(grantee.oid, c.relowner, 'USAGE'::text) OR c.grantable THEN 'YES'::text ELSE 'NO'::text END::information_schema.yes_or_no AS is_grantable, CASE WHEN c.prtype = 'SELECT'::text THEN 'YES'::text ELSE 'NO'::text END::information_schema.yes_or_no AS with_hierarchy FROM ( SELECT pg_class.oid, pg_class.relname, pg_class.relnamespace, pg_class.relkind, pg_class.relowner, (aclexplode(COALESCE(pg_class.relacl, acldefault('r'::"char", pg_class.relowner)))).grantor AS grantor, (aclexplode(COALESCE(pg_class.relacl, acldefault('r'::"char", pg_class.relowner)))).grantee AS grantee, (aclexplode(COALESCE(pg_class.relacl, acldefault('r'::"char", pg_class.relowner)))).privilege_type AS privilege_type, (aclexplode(COALESCE(pg_class.relacl, acldefault('r'::"char", pg_class.relowner)))).is_grantable AS is_grantable FROM pg_class) c(oid, relname, relnamespace, relkind, relowner, grantor, grantee, prtype, grantable), pg_namespace nc, pg_authid u_grantor, ( SELECT pg_authid.oid, pg_authid.rolname FROM pg_authid UNION ALL SELECT 0::oid AS oid, 'PUBLIC'::name) grantee(oid, rolname) WHERE c.relnamespace = nc.oid AND (c.relkind = ANY (ARRAY['r'::"char", 'v'::"char"])) AND c.grantee = grantee.oid AND c.grantor = u_grantor.oid AND (c.prtype = ANY (ARRAY['INSERT'::text, 'SELECT'::text, 'UPDATE'::text, 'DELETE'::text, 'TRUNCATE'::text, 'REFERENCES'::text, 'TRIGGER'::text])) AND (pg_has_role(u_grantor.oid, 'USAGE'::text) OR pg_has_role(grantee.oid, 'USAGE'::text) OR grantee.rolname = 'PUBLIC'::name);现在创建一个角色并赋予SELECT权限，来观察该系统表的数据。 1. 创建角色
postgres=# create role john login NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT; CREATE ROLE2. 赋予该角色一个数据库的表的SEKECT权限
-- 赋予数据库的链接权限 postgres=# GRANT CONNECT ON DATABASE postgres TO john; GRANT-- 赋予表的查询功能 postgres=# GRANT SELECT ON ALL TABLES IN SCHEMA public TO john; GRANT-- tb1表的INSERT INTO权限 postgres=# GRANT INSERT ON tb1 TO john; GRANT3. 查看该角色的所有权限
postgres=# SELECT * from information_schema.table_privileges where grantee='john' order by privilege_type; grantor | grantee | table_catalog | table_schema | table_name | privilege_type | is_grantable | with_hierarchy ----------+---------+---------------+--------------+----------------------+----------------+--------------+---------------- postgres | john | postgres | public | tb1 | INSERT | NO | NO postgres | john | postgres | public | book | SELECT | NO | YES postgres | john | postgres | public | weather | SELECT | NO | YES postgres | john | postgres | public | cities | SELECT | NO | YES postgres | john | postgres | public | tb1 | SELECT | NO | YES postgres | john | postgres | public | book2 | SELECT | NO | YES postgres | john | postgres | public | person | SELECT | NO | YES postgres | john | postgres | public | tb2 | SELECT | NO | YES postgres | john | postgres | public | orders | SELECT | NO | YES postgres | john | postgres | public | test_unlogged | SELECT | NO | YES postgres | john | postgres | public | test | SELECT | NO | YES postgres | john | postgres | public | system_monitor | SELECT | NO | YES postgres | john | postgres | public | tb3 | SELECT | NO | YES postgres | john | postgres | public | pg_stat_statements | SELECT | NO | YES postgres | john | postgres | public | view_business_device | SELECT | NO | YES postgres | john | postgres | public | student | SELECT | NO | YES postgres | john | postgres | public | pgbench_tellers | SELECT | NO | YES postgres | john | postgres | public | pgbench_branches | SELECT | NO | YES postgres | john | postgres | public | pgbench_accounts | SELECT | NO | YES postgres | john | postgres | public | pgbench_history | SELECT | NO | YES postgres | john | postgres | public | goods | SELECT | NO | YES postgres | john | postgres | public | bloat | SELECT | NO | YES (22 rows)