学习目标
模式管理包括为数据库创建模式、删除模式、查看和设置模式的搜索路径、查看模式中的信息。
课程作业
1.创建一个名为testsm、testsm1的模式
--默认不指定schema，是创建在public schema下，如果有public权限的话
openGauss=# \c newdb1
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "omm".
newdb1=# create table newdb_t1(id number);
CREATE TABLE
newdb1=# \dt+ newdb_t1
List of relations
Schema | Name | Type | Owner | Size | Storage | Description
--------+----------+-------+-------+------------+----------------------------------+-------------
public | newdb_t1 | table | omm | 8192 bytes | {orientation=row,compression=no} |
(1 row)
--创建2个schema 属于用户user1
newdb1=# create schema testsm AUTHORIZATION user1;
CREATE SCHEMA
newdb1=# create schema testsm1 AUTHORIZATION user1;
CREATE SCHEMA
newdb1=# \dn
List of schemas
Name | Owner
-----------------+-------
blockchain | omm
cstore | omm
db4ai | omm
dbe_perf | omm
dbe_pldebugger | omm
dbe_pldeveloper | omm
dbe_sql_util | omm
pkg_service | omm
public | omm
snapshot | omm
sqladvisor | omm
test | test
testsm | user1
testsm1 | user1
(14 rows)
newdb1=#
复制2.创建一个用户john, 并将testsm的owner修改为john，且修改owner前后分别使用\dn+查看模式信息
--创建用户john
newdb1=# create user john identified by 'john54321!';
CREATE ROLE
newdb1=# alter user john sysadmin;
ALTER ROLE
--修改shcma testsm的owner
newdb1=# \dn+
List of schemas
Name | Owner | Access privileges | Description | WithBlockChain
-----------------+-------+-------------------+----------------------------------+----------------
blockchain | omm | | blockchain schema | f
cstore | omm | | reserved schema for DELTA tables | f
db4ai | omm | omm=UC/omm +| db4ai schema | f
| | =U/omm | |
dbe_perf | omm | | dbe_perf schema | f
dbe_pldebugger | omm | omm=UC/omm +| dbe_pldebugger schema | f
| | =U/omm | |
dbe_pldeveloper | omm | omm=UC/omm +| dbe_pldeveloper schema | f
| | =U/omm | |
dbe_sql_util | omm | omm=UC/omm +| sql util schema | f
| | =U/omm | |
john | john | | | f
pkg_service | omm | | pkg_service schema | f
public | omm | omm=UC/omm +| standard public schema | f
| | =U/omm | |
snapshot | omm | | snapshot schema | f
sqladvisor | omm | omm=UC/omm +| sqladvisor schema | f
| | =U/omm | |
test | test | | | f
testsm | user1 | | | f
testsm1 | user1 | | | f
(15 rows)
newdb1=# alter schema testsm1 owner to john;
ALTER SCHEMA
newdb1=# \dn+
List of schemas
Name | Owner | Access privileges | Description | WithBlockChain
-----------------+-------+-------------------+----------------------------------+----------------
blockchain | omm | | blockchain schema | f
cstore | omm | | reserved schema for DELTA tables | f
db4ai | omm | omm=UC/omm +| db4ai schema | f
| | =U/omm | |
dbe_perf | omm | | dbe_perf schema | f
dbe_pldebugger | omm | omm=UC/omm +| dbe_pldebugger schema | f
| | =U/omm | |
dbe_pldeveloper | omm | omm=UC/omm +| dbe_pldeveloper schema | f
| | =U/omm | |
dbe_sql_util | omm | omm=UC/omm +| sql util schema | f
| | =U/omm | |
john | john | | | f
pkg_service | omm | | pkg_service schema | f
public | omm | omm=UC/omm +| standard public schema | f
| | =U/omm | |
snapshot | omm | | snapshot schema | f
sqladvisor | omm | omm=UC/omm +| sqladvisor schema | f
| | =U/omm | |
test | test | | | f
testsm | user1 | | | f
testsm1 | john | | | f
(15 rows)
## 3.重命名testsm为testsm2
```sql
newdb1=# \dn+
List of schemas
Name | Owner | Access privileges | Description | WithBlockChain
-----------------+-------+-------------------+----------------------------------+----------------
blockchain | omm | | blockchain schema | f
cstore | omm | | reserved schema for DELTA tables | f
db4ai | omm | omm=UC/omm +| db4ai schema | f
| | =U/omm | |
dbe_perf | omm | | dbe_perf schema | f
dbe_pldebugger | omm | omm=UC/omm +| dbe_pldebugger schema | f
| | =U/omm | |
dbe_pldeveloper | omm | omm=UC/omm +| dbe_pldeveloper schema | f
| | =U/omm | |
dbe_sql_util | omm | omm=UC/omm +| sql util schema | f
| | =U/omm | |
john | john | | | f
pkg_service | omm | | pkg_service schema | f
public | omm | omm=UC/omm +| standard public schema | f
| | =U/omm | |
snapshot | omm | | snapshot schema | f
sqladvisor | omm | omm=UC/omm +| sqladvisor schema | f
| | =U/omm | |
test | test | | | f
testsm | user1 | | | f
testsm1 | john | | | f
(15 rows)
newdb1=# alter schema testsm1 rename to testsm2;
ALTER SCHEMA
newdb1=# \dn+
List of schemas
Name | Owner | Access privileges | Description | WithBlockChain
-----------------+-------+-------------------+----------------------------------+----------------
blockchain | omm | | blockchain schema | f
cstore | omm | | reserved schema for DELTA tables | f
db4ai | omm | omm=UC/omm +| db4ai schema | f
| | =U/omm | |
dbe_perf | omm | | dbe_perf schema | f
dbe_pldebugger | omm | omm=UC/omm +| dbe_pldebugger schema | f
| | =U/omm | |
dbe_pldeveloper | omm | omm=UC/omm +| dbe_pldeveloper schema | f
| | =U/omm | |
dbe_sql_util | omm | omm=UC/omm +| sql util schema | f
| | =U/omm | |
john | john | | | f
pkg_service | omm | | pkg_service schema | f
public | omm | omm=UC/omm +| standard public schema | f
| | =U/omm | |
snapshot | omm | | snapshot schema | f
sqladvisor | omm | omm=UC/omm +| sqladvisor schema | f
| | =U/omm | |
test | test | | | f
testsm | user1 | | | f
testsm2 | john | | | f
(15 rows)
newdb1=#
复制4.在模式testsm1中建表t1、插入记录和查询记录
newdb1=# create table testsm.t1(id number);
CREATE TABLE
newdb1=# insert into testsm.t1 values(1);
INSERT 0 1
newdb1-# \dt+
List of relations
Schema | Name | Type | Owner | Size | Storage | Description
--------+----------+-------+-------+------------+----------------------------------+-------------
public | newdb_t1 | table | omm | 8192 bytes | {orientation=row,compression=no} |
(1 row)
newdb1=# set SEARCH_PATH TO testsm;
SET
newdb1=# \dt+
List of relations
Schema | Name | Type | Owner | Size | Storage | Description
--------+------+-------+-------+-------+----------------------------------+-------------
testsm | t1 | table | omm | 16 kB | {orientation=row,compression=no} |
(1 row)
newdb1=# select * FROM T1;
id
----
1
(1 row)
复制5.在会话级设置模式搜索顺序
newdb2=# \c newdb1
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "omm".
newdb1=# show search_path ;
search_path
----------------
"$user",public
(1 row)
newdb1=# set SEARCH_PATH TO testsm,public;
SET
newdb1=# \dt+
List of relations
Schema | Name | Type | Owner | Size | Storage | Description
--------+----------+-------+-------+------------+----------------------------------+-------------
public | newdb_t1 | table | omm | 8192 bytes | {orientation=row,compression=no} |
testsm | t1 | table | omm | 16 kB | {orientation=row,compression=no} |
(2 rows)
newdb1-# \q
[omm@og3 ~]$ gsql -p 26000 -d postgres -r
gsql ((openGauss 3.1.0 build 4e931f9a) compiled at 2022-09-29 14:19:24 commit 0 last mr )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.
openGauss=# \c newdb1
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "omm".
newdb1=# show search_path ;
search_path
----------------
"$user",public
(1 row)
复制6.在数据库级设置模式搜索顺序
newdb1=# show search_path ;
search_path
----------------
"$user",public
(1 row)
newdb1=# alter database newdb1 set search_path to testsm,public;
ALTER DATABASE
newdb1=# show search_path ;
search_path
----------------
"$user",public
(1 row)
newdb1-# \q
[omm@og3 ~]$ gsql -p 26000 -d postgres -r
gsql ((openGauss 3.1.0 build 4e931f9a) compiled at 2022-09-29 14:19:24 commit 0 last mr )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.
openGauss=# \c newdb1
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "omm".
newdb1=# show search_path ;
search_path
----------------
testsm, public
(1 row)
复制7.在用户级设置模式搜索顺序
newdb1=# alter user john set search_path to public,testsm;
ALTER ROLE
newdb1=# show search_path ;
search_path
----------------
testsm, public
(1 row)
newdb1=# \c newdb1 john
Password for user john:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "newdb1" as user "john".
newdb1=> show search_path ;
search_path
----------------
public, testsm
(1 row)
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