postgresql初体验

docker pull orchardup/postgresql

docker run -d -p 5432:5432 -e POSTGRESQL_USER=test -e POSTGRESQL_PASS=oe9jaacZLbR9pN -e POSTGRESQL_DB=test orchardup/postgresql

docker exec -it a397deee6810 /bin/bash

## 使用test用户连接到test数据库

psql -h localhost -U test test

## 查看有什么数据库

test=# \l

postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |

template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +

| | | | | postgres=CTc/postgres

template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +

| | | | | postgres=CTc/postgres

test | test | UTF8 | en_US.UTF-8 | en_US.UTF-8 |

## 切换到test数据库

test=# \c test

SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)

You are now connected to database "test" as user "test".

test=#

## 查看表

test=# \dt

No relations found.

## 创建表

test=# create table test2 (id integer,name text);

CREATE TABLE

## 查看表

test=# \d

List of relations

Schema | Name | Type | Owner

--------+-------+-------+-------

public | test2 | table | test

(1 row)

## 插入数据

test=# insert into test2 values(1,'david');

INSERT 0 1

## 查询表中数据

test=# select * from test2;

id | name

----+-------

1 | david

(1 row)

## 更新表中记录

test=# update test2 set fullname = 'ryan' where id=1;

UPDATE 1

test=#

## 查看表结构

test=# \d test2

id | integer |

name | text |

## 修改表结构，增加一个字段

test=# alter table test2 add column age integer;

ALTER TABLE

test=# \d test2

id | integer |

name | text |

age | integer |

## 修改表结构，删除一个字段

test=# alter table test2 drop column age;

ALTER TABLE

test=# \d test2

id | integer |

name | text |

## 修改表结构，重命名一个字段

test=# alter table test2 rename column name to fullName ;

ALTER TABLE

test=# \d test2

id | integer |

fullname | text |

## 首先，创建数据库用户dbuser，并指定其为超级用户。

root@a397deee6810:/# sudo -u postgres createuser --superuser dbuser

## 登录数据库控制台，设置dbuser用户的密码，完成后退出控制台。

root@a397deee6810:/# sudo -u postgres psql

psql (9.3.5)

Type "help" for help.

postgres=# \password dbuser

Enter new password:

Enter it again:

postgres=# \q

could not save history to file "/var/lib/postgresql/.psql_history": No such file or directory

## 在shell命令行下，创建数据库exampledb，并指定所有者为dbuser。

root@a397deee6810:/# sudo -u postgres createdb -O dbuser exampledb

root@a397deee6810:/# sudo -u postgres psql

psql (9.3.5)

Type "help" for help.

postgres=# \l

List of databases

Name | Owner | Encoding | Collate | Ctype | Access privileges

-----------+----------+----------+-------------+-------------+-----------------------

exampledb | dbuser | UTF8 | en_US.UTF-8 | en_US.UTF-8 |

postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |

template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +

| | | | | postgres=CTc/postgres

template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +

| | | | | postgres=CTc/postgres

test | test | UTF8 | en_US.UTF-8 | en_US.UTF-8 |

(5 rows)

## 使用dbuser用户登录，切换到数据库exampledb

root@a397deee6810:/# psql -U dbuser -d exampledb -h 127.0.0.1 -p 5432

## 导入sql文件数据到test表中

root@a397deee6810:/# vi test.sql

insert into test2 values(2,'aaa');

insert into test2 values(3,'bbb');

insert into test2 values(4,'ccc');

root@a397deee6810:/#

root@a397deee6810:/# psql -U test -d test < test.sql

INSERT 0 1

INSERT 0 1

INSERT 0 1

root@a397deee6810:/# psql -U test -d test -h 127.0.0.1 -p 5432

psql (9.3.5)

SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)

Type "help" for help.

test=# select * from test2;

id | fullname

----+----------

1 | ryan

2 | aaa

3 | bbb

4 | ccc

(4 rows)

test=#