1 创建数据库及表空间
root@modb:~# su - omm omm@modb:~$ gsql -r gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr ) Non-SSL connection (SSL connection is recommended when requiring high-security) Type "help" for help. omm=# \l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges -----------+-------+----------+---------+-------+------------------- omm | omm | UTF8 | C | C | postgres | omm | UTF8 | C | C | template0 | omm | UTF8 | C | C | =c/omm + | | | | | omm=CTc/omm template1 | omm | UTF8 | C | C | =c/omm + | | | | | omm=CTc/omm (4 rows) omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1'; CREATE TABLESPACE omm=# CREATE DATABASE musicdb WITH TABLESPACE = music_tbs; CREATE DATABASE
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2 创建用户并授权
omm=# CREATE USER user1 IDENTIFIED BY 'kunpeng@1234'; NOTICE: The encrypted password contains MD5 ciphertext, which is not secure. CREATE ROLE omm=# ALTER USER user1 SYSADMIN; ALTER ROLE
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3 使用创建用户连接数据库
omm@modb:~$ gsql -d musicdb -U user1 -p 5432 -W kunpeng@1234 -r gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr ) Non-SSL connection (SSL connection is recommended when requiring high-security) Type "help" for help. musicdb=> \l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges -----------+-------+----------+---------+-------+------------------- musicdb | omm | UTF8 | C | C | omm | omm | UTF8 | C | C | postgres | omm | UTF8 | C | C | template0 | omm | UTF8 | C | C | =c/omm + | | | | | omm=CTc/omm template1 | omm | UTF8 | C | C | =c/omm + | | | | | omm=CTc/omm (5 rows) musicdb=> List of tablespaces Name | Owner | Location ------------+-------+--------------------- music_tbs | omm | tablespace/test_ts1 pg_default | omm |
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4 在musicdb库下创建四个schema
musicdb=> create schema schema2 AUTHORIZATION user1; musicdb=> CREATE SCHEMA musicdb=> create schema schema3 AUTHORIZATION user1; CREATE SCHEMA musicdb=> create schema schema4 AUTHORIZATION user1; CREATE SCHEMA
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5 查看musicdb库下所有模式
musicdb=> \dn List of schemas Name | Owner -----------------+------- blockchain | omm cstore | omm db4ai | omm dbe_perf | omm dbe_pldebugger | omm dbe_pldeveloper | omm pkg_service | omm public | omm schema1 | user1 schema2 | user1 schema3 | user1 schema4 | user1 schm1 | user1 snapshot | omm sqladvisor | omm (15 rows) musicdb=> SELECT catalog_name, schema_name, schema_owner FROM information_schema.schemata; catalog_name | schema_name | schema_owner --------------+--------------------+-------------- musicdb | pg_toast | omm musicdb | cstore | omm musicdb | pkg_service | omm musicdb | dbe_perf | omm musicdb | snapshot | omm musicdb | blockchain | omm musicdb | pg_catalog | omm musicdb | public | omm musicdb | sqladvisor | omm musicdb | dbe_pldebugger | omm musicdb | dbe_pldeveloper | omm musicdb | information_schema | omm musicdb | db4ai | omm musicdb | schm1 | user1 musicdb | schema1 | user1 musicdb | schema2 | user1 musicdb | schema3 | user1 musicdb | schema4 | user1 (18 rows) -- 通过以上两种方式查看数据库下的所有模式,可以发现查询到信息有些差异,\dn查询到的要少一些,相比语句查询少了pg_toast、snapshot、information_schema这三个模式。
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6 分别在musicdb库下不同模式创建同名表并插入数据
musicdb=> create table schema1.tb01(content varchar(100)); CREATE TABLE musicdb=> create table schema2.tb01(content varchar(100)); CREATE TABLE musicdb=> create table schema3.tb01(content varchar(100)); CREATE TABLE musicdb=> create table schema4.tb01(content varchar(100)); CREATE TABLE musicdb=> musicdb=> insert into schema1.tb01 values('This is schema1'); INSERT 0 1 musicdb=> insert into schema2.tb01 values('This is schema2'); INSERT 0 1 musicdb=> insert into schema3.tb01 values('This is schema3'); INSERT 0 1 musicdb=> insert into schema4.tb01 values('This is schema4'); INSERT 0 1
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7 创建并查看视图
musicdb=> create or replace view show_tables as musicdb-> select table_catalog, table_schema, table_name, table_type musicdb-> from information_schema.tables musicdb-> where table_schema not in ('pg_catalog', 'information_schema','dbe_perf'); CREATE VIEW musicdb=> select * from show_tables; table_catalog | table_schema | table_name | table_type ---------------+-----------------+-------------+------------ musicdb | db4ai | snapshot | BASE TABLE musicdb | dbe_pldeveloper | gs_errors | BASE TABLE musicdb | dbe_pldeveloper | gs_source | BASE TABLE musicdb | public | show_tables | VIEW musicdb | schema4 | tb01 | BASE TABLE musicdb | schema3 | tb01 | BASE TABLE musicdb | schema2 | tb01 | BASE TABLE musicdb | schema1 | tb01 | BASE TABLE (8 rows)
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8 查看搜索模式顺序
musicdb=> show SEARCH_PATH; search_path ---------------- "$user",public (1 row) -- 可以看到搜索模式的顺序是先搜索user,再搜索public
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9 使用user1访问musicdb库下不同模式的同名表
musicdb=> select * from schema1.tb01; musicdb=> content ----------------- This is schema1 (1 row) musicdb=> select * from schema2.tb01; content ----------------- This is schema2 (1 row) musicdb=> select * from schema3.tb01; content ----------------- This is schema3 (1 row) musicdb=> select * from schema4.tb01; content ----------------- This is schema4 (1 row)
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