創建數據庫
更新時間 2025-02-14 10:21:33
最近更新時間: 2025-02-14 10:21:33
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本文為您介紹創建數據庫的相關操作。
要創建一個數據庫，必須是一個超級用戶或者具有特殊的CREATEDB特權，默認情況下，新數據庫將通過克隆標準系統數據庫template1被創建。可以通過寫TEMPLATE name指定一個不同的模板。特別地，通過寫TEMPLATE template0您可以創建一個干凈的數據庫，它將只包含的Teledb所預定義的標準對象。
默認參數創建數據庫
teledb=# create database teledb_db;
CREATE DATABASE指定克隆庫
teledb=# create database teledb_db_template TEMPLATE template0;
CREATE DATABASE指定所有者
teledb=# create role teledb_user with login;
CREATE ROLE
teledb=# create database teledb_db_owner owner teledb_user;
CREATE DATABASE
teledb=# \l+ teledb_db_owner
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges | Size | Tablespace | Description
------------------+--------------+----------+-------------+-------------+-------------------+-------+------------+-------------
teledb_db_owner | teledb_user | UTF8 | zh_CN.UTF-8 | zh_CN.UTF-8 | | 19 MB | pg_default |
(1 row)指定編碼
teledb=# create database teledb_db_encoding ENCODING UTF8;
CREATE DATABASE
teledb=# \l+ teledb_db_encoding
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges | Size | Tablespace | Description
---------------------+---------+----------+-------------+-------------+-------------------+-------+------------+-------------
teledb_db_encoding | teledb | UTF8 | zh_CN.UTF-8 | zh_CN.UTF-8 | | 19 MB | pg_default |
(1 row)創建gbk編碼
teledb=# CREATE DATABASE db_gbk template template0 encoding = gbk LC_COLLATE = 'zh_CN.gbk' LC_CTYPE = 'zh_CN.gbk';
CREATE DATABASE
teledb=# \d db_gbk
Did not find any relation named "db_gbk".
teledb=# \l+ db_gbk
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges | Size | Tablespace | Description
--------+---------+----------+-----------+-----------+-------------------+-------+------------+-------------
db_gbk | teledb | GBK | zh_CN.gbk | zh_CN.gbk | | 19 MB | pg_default |
(1 row)指定排序規則
teledb=# create database teledb_db_lc_collate lc_collate 'C' template template0;
CREATE DATABASE指定分組規則
teledb=# create database teledb_lc_ctype LC_CTYPE 'C' template template0;
CREATE DATABASE配置數據可連接
teledb=# create database teledb__allow_connections ALLOW_CONNECTIONS true;
CREATE DATABASE
teledb=# select datallowconn from pg_database where datname = 'teledb__allow_connections';
datallowconn
--------------
t
(1 row)
teledb=# \c teledb__allow_connections
You are now connected to database "teledb__allow_connections" as user "teledb".配置連接數
teledb=# create database teledb_connlimit CONNECTION LIMIT 100;
CREATE DATABASE
teledb=# select datconnlimit from pg_database where datname='teledb_connlimit';
datconnlimit
--------------
100
(1 row)配置數據庫可以被復制（是否模板數據庫）
teledb=# create database teledb_istemplate is_template true;
CREATE DATABASE
teledb=# select datconnlimit from pg_database where datname='teledb_connlimit';
datconnlimit
--------------
100
(1 row)多個參數一起配置
teledb=# create database teledb_mul owner teledb_user CONNECTION LIMIT 50 template template0 encoding 'utf8' lc_collate 'C';
CREATE DATABASE
