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database.py
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database.py
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from log import log_to_file as log
from errors import *
import mysql.connector as mysql
import os, datetime
class database:
def __init__(self, db_name):
"""
This class will be used to work with a database in the GUI.
To initate it, you must login with an accurate username, password, and hostname for the MySQL server.
"""
self.name = db_name
log.log('logs.txt', 'Class database initiated on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
def login(self, user, password, host):
"""
This function will return nothing, but to use this make sure to use the try and except brackets when running this.
If LoginError has been raised, then there was an error while logging in. If DatabaseError was raised, there was an
issue in making sure the database was created. If BackupError is raised, then there was an issue in backing up the
database. The goal of this is to establish a connection with the database, make sure the correct tables are setup,
and backup the database.
"""
self.user = user
self.password = password
self.host = host
try:
self.db = mysql.connect(
host = self.host,
user = self.user,
passwd = self.password)
except:
raise LoginError
log.log('error.txt', 'Failure to log into database on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
else:
log.log('logs.txt', 'Login to database successful on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
try:
cursor = self.db.cursor()
cursor.execute('CREATE DATABASE IF NOT EXISTS {};'.format(self.name))
cursor.execute('USE {};'.format(self.name))
cursor.execute('CREATE TABLE IF NOT EXISTS Coins( coin_id INT AUTO_INCREMENT PRIMARY KEY, type VARCHAR(20), year INT, mint VARCHAR(10), description VARCHAR(50), coin_condition VARCHAR(2), value INT, time TIMESTAMP);')
cursor.close()
self.db.commit()
except:
raise DatabaseError
log.log('error.txt', 'Failure to setup database on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
else:
log.log('logs.txt', 'Database setup successfully on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
try:
backup = self.backup()
except BackupFailed:
raise BackupError
else:
log.log('logs.txt', 'Backup successful on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
def backup(self):
"""
This command, when run will create a backup for your database to be used in case of corruption or loss of data.
If the backup errors out it will raise BackupFailed.
"""
try:
os.system('mysqldump -u {0} -p{1} -h {2} --databases {3} > {3}_backup.sql'.format(self.user, self.password, self.host, self.name))
except:
raise BackupFailed
log.log('error.txt', 'Failure to complete backup on {} at {}.\n'.format(str(datetime.datetime.now()).split(" ")[0], str(datetime.datetime.now()).split(" ")[1]))
def quit(self):
"""
Close the database.
"""
try:
self.db.close()
except:
raise QuitError
else:
try:
self.backup()
except BackupFailed:
raise BackupError
def add(self, type, year, mint, description, coin_condition, value):
"""
This function is used to add entries to the table in the database that has been created.
"""
try:
cursor = self.db.cursor()
cursor.execute('INSERT INTO Coins (type, year, mint, description, coin_condition, value) VALUES ("{}", {}, "{}", "{}", "{}", {});'.format(type, year, mint, description, coin_condition, value))
cursor.close()
self.db.commit()
except:
raise AddError
def remove(self, id):
"""
This function will be used to remove entries in the table via their custom id.
"""
try:
cursor = self.db.cursor()
cursor.execute('DELETE FROM Coins WHERE coin_id = {};'.format(id))
cursor.close()
self.db.commit()
except:
raise RemoveError
def recover_from_backup(self):
"""
This command, when run will recover your data from a backup.
"""
try:
os.system('mysqldump -u {} -p{} -h {} --databases Coin < coin_backup.sql'.format(self.user, self.password, self.host))
except:
raise RecoverError
def search(self, type, year, mint, condition, description, order_by):
"""
This function is used to search the database's table.
You can put in as little or as many options you like, as it is created to
accept both blank and actual constraints. This also has an order_by value
which is used to order the data.
"""
if type == "":
type='!= ""'
else:
type='= "{}"'.format(type)
if year == "":
year='!= ""'
else:
year='= "{}"'.format(year)
if mint == "":
mint='!= ""'
else:
mint='= "{}"'.format(mint)
if condition == "":
condition='!= ""'
else:
condition='= "{}"'.format(condition)
if description == "":
description='!= ""'
else:
description='= "{}"'.format(description)
if order_by == "":
order_by = ""
else:
order_by = 'ORDER BY {}'.format(order_by)
try:
cursor = self.db.cursor()
cursor.execute('SELECT coin_id, type, year, mint, description, coin_condition, value FROM Coins WHERE type {} AND year {} AND mint {} AND description {} and coin_condition {} {};'.format(type, year, mint, description, condition, order_by))
search = cursor.fetchall()
cursor.close()
self.db.commit()
return search
except:
raise SearchError
def return_db(self):
"""
Returns the whole database.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT coin_id, type, year, mint, description, coin_condition, value FROM Coins ORDER BY coin_id;')
all = cursor.fetchall()
cursor.close()
return all
except:
raise SearchError
def amount_of_coins(self):
"""
Returns the total amount of coins in the database.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT coin_id FROM Coins;')
output = cursor.fetchall()
cursor.close()
amount = 0
for val in output:
amount += 1
return amount
except:
raise SearchError
def by_type(self):
"""
Returns how many coins of each type are in the database.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT type FROM Coins;')
output = cursor.fetchall()
cursor.close()
penny_amount = 0
nickel_amount = 0
dime_amount = 0
quarter_amount = 0
half_amount = 0
dollar_amount = 0
for type in output:
if type == ('Penny',):
penny_amount += 1
elif type == ('Nickel',):
nickel_amount += 1
elif type == ('Dime',):
dime_amount += 1
elif type == ('Quarter',):
quarter_amount += 1
elif type == ('Half Dollar',):
half_amount += 1
elif type == ('Dollar',):
dollar_amount += 1
return [str(penny_amount), str(nickel_amount), str(dime_amount), str(quarter_amount), str(half_amount), str(dollar_amount)]
except:
raise SearchError
def by_mint(self):
"""
Returns the amount of coins minted in each location.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT mint FROM Coins;')
output = cursor.fetchall()
cursor.close()
p = 0
d = 0
s = 0
w = 0
for type in output:
if type == ('P',):
p += 1
elif type == ('D',):
d += 1
elif type == ('S',):
s += 1
elif type == ('W',):
w += 1
return [str(p), str(d), str(s), str(w)]
except:
raise SearchError
def total_val(self):
"""
Returns the overall value of all coins in your database.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT value FROM Coins;')
output = cursor.fetchall()
cursor.close()
total = 0
for val in output:
if val[0] == None:
pass
else:
total += val[0]
return total
except:
raise SearchError
def most_expensive(self):
"""
Returns the value of the most expensive coin in the database.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT value FROM Coins;')
output = cursor.fetchall()
cursor.close()
most_expensive = 0
for price in output:
worth = price[0]
if worth > most_expensive:
most_expensive = price[0]
return most_expensive
except:
raise SearchError
def oldest_coin(self):
"""
Returns the year of the oldest coin in the database.
"""
try:
cursor = self.db.cursor()
cursor.execute('SELECT year FROM Coins;')
output = cursor.fetchall()
cursor.close()
oldest = 2000000
for year in output:
how_old = year[0]
if how_old < oldest:
oldest = year[0]
return oldest
except:
raise SearchError
if __name__ == "__main__":
db = database("Coin")
user = input("Username: ")
passwrd = input("Password: ")
host = input("Host: ")
db.login(user, passwrd, host)
db.remove('abasj')
db.quit()