![selvamani@selvamani-laptop:~$ sudo su - postgres
[sudo] password for selvamani:
postgres@selvamani-laptop:~$ psql -U pgsqldemouser pgsqldemodb
psql (8.4.3)
Type "help" for help.
pgsqldemodb=> create table pgsqldemotable(sno varchar(3), name varchar(30));
CREATE TABLE
pgsqldemodb=> insert into pgsqldemotable values('1','Arulalan');
INSERT 0 1
pgsqldemodb=> insert into pgsqldemotable values('2','BalaKrishnan');
INSERT 0 1
pgsqldemodb=> insert into pgsqldemotable values('3','Dhasthagheer');
INSERT 0 1
pgsqldemodb=> insert into pgsqldemotable values('4','Selvamani');
INSERT 0 1
pgsqldemodb=> select * from pgsqldemotable;
sno | name
-----+--------------
1 | Arulalan
2 | BalaKrishnan
3 | Dhasthagheer
4 | Selvamani
(4 rows)
pgsqldemodb=> alter role pgsqldemouser with password 'demo';
ALTER ROLE
pgsqldemodb=> q
postgres@selvamani-laptop:~$ logout
selvamani@selvamani-laptop:~$ python
Python 2.6.4 (r264:75706, Dec 7 2009, 18:45:15)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import psycopg2
>>> connection=psycopg2.connect("host=localhost dbname=pgsqldemodb user=pgsqldemouser
password=demo")
cur=connection.cursor()
>>> cur.execute("""select * from pgsqldemotable""")
>>> a=cur.fetchall()
>>> print a
[('1', 'Arulalan'), ('2', 'BalaKrishnan'),('3','Dhasthagheer'), ('4', 'Selvamani')]
>>> type(a)
<type 'list'>
>>> type(a[0])
<type 'tuple'>
>>> type(a[0][0])
<type 'str'>
>>> type(a[0][1])
<type 'str'>
>>> a[0][1]
'Arulalan'
>>> a[1][1]](https://image.slidesharecdn.com/klugpgsqltut-100503064408-phpapp02/85/Klug-pgsql-tut-1-320.jpg)
Klug pgsql tut
- 1. selvamani@selvamani-laptop:~$ sudo su - postgres [sudo] password for selvamani: postgres@selvamani-laptop:~$ psql -U pgsqldemouser pgsqldemodb psql (8.4.3) Type "help" for help. pgsqldemodb=> create table pgsqldemotable(sno varchar(3), name varchar(30)); CREATE TABLE pgsqldemodb=> insert into pgsqldemotable values('1','Arulalan'); INSERT 0 1 pgsqldemodb=> insert into pgsqldemotable values('2','BalaKrishnan'); INSERT 0 1 pgsqldemodb=> insert into pgsqldemotable values('3','Dhasthagheer'); INSERT 0 1 pgsqldemodb=> insert into pgsqldemotable values('4','Selvamani'); INSERT 0 1 pgsqldemodb=> select * from pgsqldemotable; sno | name -----+-------------- 1 | Arulalan 2 | BalaKrishnan 3 | Dhasthagheer 4 | Selvamani (4 rows) pgsqldemodb=> alter role pgsqldemouser with password 'demo'; ALTER ROLE pgsqldemodb=> q postgres@selvamani-laptop:~$ logout selvamani@selvamani-laptop:~$ python Python 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import psycopg2 >>> connection=psycopg2.connect("host=localhost dbname=pgsqldemodb user=pgsqldemouser password=demo") cur=connection.cursor() >>> cur.execute("""select * from pgsqldemotable""") >>> a=cur.fetchall() >>> print a [('1', 'Arulalan'), ('2', 'BalaKrishnan'),('3','Dhasthagheer'), ('4', 'Selvamani')] >>> type(a) <type 'list'> >>> type(a[0]) <type 'tuple'> >>> type(a[0][0]) <type 'str'> >>> type(a[0][1]) <type 'str'> >>> a[0][1] 'Arulalan' >>> a[1][1]
- 2. 'BalaKrishnan' >>> cur.execute("""insert into pgsqldemotable values('5','Rajkumar')""") >>> connection.commit() >>> sno=raw_input("""Enter the value:""") Enter the value:6 >>> name=raw_input("""Enter the value:""") Enter the value:Shrinivasan >>> cur.execute("""insert into pgsqldemotable values('%s','%s')""" %(sno,name)) >>> connection.commit() >>> exit() selvamani@selvamani-laptop:~$ sudo su - postgres postgres@selvamani-laptop:~$ psql -U pgsqldemouser -W pgsqldemodb Password for user pgsqldemouser: psql (8.4.3) Type "help" for help. pgsqldemodb=> select * from pgsqldemotable; sno | name -----+-------------- 1 | Arulalan 2 | BalaKrishnan 3 | Dhasthagheer 4 | Selvamani 5 | Rajkumar 6 | Shrinivasan (6 rows) pgsqldemodb=> q postgres@selvamani-laptop:~$ logout selvamani@selvamani-laptop:~$