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homework #4

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Binary file added __pycache__/config.cpython-38.pyc
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1 change: 1 addition & 0 deletions company.pgerd
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20 changes: 20 additions & 0 deletions config.py
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#!/usr/bin/python
from configparser import ConfigParser

def config(filename, section):
# create a parser
parser = ConfigParser()
# read config file
parser.read(filename)

# get section, default to postgresql
db = {} #empty dictionary
if parser.has_section(section):
params = parser.items(section) #params is a list of tuples
# params = [('host', 'localhost'), ('database', 'Chinook_PostgreSql'), ('user', 'postgres'), ('password', 'postgres')]
for param in params: #param is a tuple (0,1)>>>> param= ('host', 'localhost')
db[param[0]] = param[1] #dict_name[key]=value
else:
raise Exception('Section {0} not found in the {1} file'.format(section,filename))
# db = {'host': 'localhost', 'database': 'Chinook_PostgreSql', 'user': 'postgres', 'password': 'postgres'}
return db
54 changes: 54 additions & 0 deletions connecttoDB.py
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#!/usr/bin/python
import psycopg2
from config import config


def connect():
""" Connect to the PostgreSQL database server """
conn = None
try:
# read connection parameters
params = config("database.ini","learn_pagila")
#params= {'host': 'localhost', 'database': 'Chinook_PostgreSql', 'user': 'postgres', 'password': 'postgres'}

# connect to the PostgreSQL server
print('Connecting to the PostgreSQL database...')
conn = psycopg2.connect(**params)
conn.autocommit = True
# create a cursor
cur = conn.cursor()

# execute a statement
# file = open('sqlcommands.sql', 'r')
# sqlFile = file.read()
# file.close()
# sqlCommands = sqlFile.split(';')[:-1]
# for command in sqlCommands:
# try:
# cur.execute(command)
# print(cur.fetchall())
# except (Exception, psycopg2.DatabaseError) as error:
# print("Command skipped: ", error)
# break


cur.execute('SELECT * from actor;')
print(cur.fetchall())
cur.execute('SELECT * FROM category;')
print(cur.fetchone())
cur.execute('SELECT * from address;')
print(cur.fetchmany(50))



# close the communication with the PostgreSQL
cur.close()
except (Exception, psycopg2.DatabaseError) as error:
print(error)
finally:
if conn is not None:
conn.close()
print('Database connection closed.')

if __name__ == '__main__':
connect()
20 changes: 20 additions & 0 deletions database.ini
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[learn_pagila]
host=localhost
database=learn_pagila
user=postgres
password=postgres


[PyCoders]
host=localhost
database=PyCoders
user=postgres
password=postgres



; conn = psycopg2.connect(
; host="localhost",
; database="Chinook_PostgreSql",
; user="postgres",
; password="1234")
10 changes: 10 additions & 0 deletions ex5sqlcommands.sql
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CREATE TABLE students (student_id int,FirstName varchar(255), PRIMARY KEY (student_id));
CREATE TABLE teachers (teacher_id int,FirstName varchar(255), PRIMARY KEY (teacher_id));

INSERT INTO students (student_id, FirstName) VALUES (4006, 'Rama ');
INSERT INTO students (student_id, FirstName) VALUES (4005, 'rima ');
INSERT INTO students (student_id, FirstName) VALUES (4004, 'sobhi ');

INSERT INTO teachers (teacher_id, FirstName) VALUES (11, 'x ');
INSERT INTO teachers (teacher_id, FirstName) VALUES (12, 'xy');
INSERT INTO teachers (teacher_id, FirstName) VALUES (13, 'xyz ');
50 changes: 50 additions & 0 deletions exercise5.py
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#!/usr/bin/python
import psycopg2
from config import config


def connect():
""" Connect to the PostgreSQL database server """
conn = None
try:
# read connection parameters
params = config("database.ini", "PyCoders")
# connect to the PostgreSQL server
print('Connecting to the PyCoders database...')
conn = psycopg2.connect(**params)
conn.autocommit = True
# create a cursor
cur = conn.cursor()

file = open('ex5sqlcommands.sql', 'r')
sqlFile = file.read()
file.close()
sqlCommands = sqlFile.split(';')[:-1]
for command in sqlCommands:
try:
cur.execute(command)
# print(cur.fetchall())
except (Exception, psycopg2.DatabaseError) as error:
print("Command skipped because of the error: ", error)
break


sql_select_query='SELECT * FROM students'
cur.execute(sql_select_query)
print(cur.fetchall())

sql_select_query='SELECT * FROM teachers'
cur.execute(sql_select_query)
print(cur.fetchall())
cur.close()


except (Exception, psycopg2.DatabaseError) as error:
print(error)
finally:
if conn is not None:
conn.close()
print('Database connection closed.')

if __name__ == '__main__':
connect()
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