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Database schema migration to version 3.

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This commit is contained in:
s3lph 2018-08-31 19:28:28 +02:00
parent a4ed09933e
commit 0adba41c8d
7 changed files with 170 additions and 8 deletions
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18
matemat/db/facade.py
View file

@ -5,7 +5,7 @@ from typing import List, Optional, Any, Type
import crypt
from hmac import compare_digest
from matemat.db.primitives import User, Product
from matemat.db.primitives import User, Product, ReceiptPreference
from matemat.exceptions import AuthenticationError, DatabaseConsistencyError
from matemat.db import DatabaseWrapper
from matemat.db.wrapper import Transaction
@ -101,14 +101,18 @@ class MatematDatabase(object):
"""
with self.db.transaction(exclusive=False) as c:
# Fetch all values to construct the user
c.execute('SELECT user_id, username, email, is_admin, is_member, balance FROM users WHERE user_id = ?',
c.execute('''
SELECT user_id, username, email, is_admin, is_member, balance, receipt_pref
FROM users
WHERE user_id = ?
''',
[uid])
row = c.fetchone()
if row is None:
raise ValueError(f'No user with user ID {uid} exists.')
# Unpack the row and construct the user
user_id, username, email, is_admin, is_member, balance = row
return User(user_id, username, balance, email, is_admin, is_member)
user_id, username, email, is_admin, is_member, balance, receipt_pref = row
return User(user_id, username, balance, email, is_admin, is_member, ReceiptPreference(receipt_pref))
def create_user(self,
username: str,
@ -261,6 +265,7 @@ class MatematDatabase(object):
balance: int = kwargs['balance'] if 'balance' in kwargs else user.balance
is_admin: bool = kwargs['is_admin'] if 'is_admin' in kwargs else user.is_admin
is_member: bool = kwargs['is_member'] if 'is_member' in kwargs else user.is_member
receipt_pref: ReceiptPreference = kwargs['receipt_pref'] if 'receipt_pref' in kwargs else user.receipt_pref
with self.db.transaction() as c:
c.execute('SELECT balance FROM users WHERE user_id = :user_id', {'user_id': user.id})
row = c.fetchone()
@ -290,6 +295,7 @@ class MatematDatabase(object):
balance = :balance,
is_admin = :is_admin,
is_member = :is_member,
receipt_pref = :receipt_pref,
lastchange = STRFTIME('%s', 'now')
WHERE user_id = :user_id
''', {
@ -298,7 +304,8 @@ class MatematDatabase(object):
'email': email,
'balance': balance,
'is_admin': is_admin,
'is_member': is_member
'is_member': is_member,
'receipt_pref': receipt_pref.value
})
# Only update the actual user object after the changes in the database succeeded
user.name = name
@ -306,6 +313,7 @@ class MatematDatabase(object):
user.balance = balance
user.is_admin = is_admin
user.is_member = is_member
user.receipt_pref = receipt_pref
def delete_user(self, user: User) -> None:
"""

43
matemat/db/migrations.py
View file

@ -113,3 +113,46 @@ def migrate_schema_1_to_2(c: sqlite3.Cursor):
ta_id -= 1
# Drop the old consumption table
c.execute('DROP TABLE consumption')
def migrate_schema_2_to_3(c: sqlite3.Cursor):
# Add missing column to users table
c.execute('ALTER TABLE users ADD COLUMN receipt_pref INTEGER(1) NOT NULL DEFAULT 0')
# Change modifications table
c.execute('''
CREATE TABLE modifications_new (
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
)
''')
c.execute('''
INSERT INTO modifications_new (ta_id, agent, reason)
SELECT m.ta_id, COALESCE(u.username, '<unknown>'), m.reason
FROM modifications as m
LEFT JOIN users as u
ON u.user_id = m.agent_id
''')
c.execute('DROP TABLE modifications')
c.execute('ALTER TABLE modifications_new RENAME TO modifications')
# Create missing table
c.execute('''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER NOT NULL,
last_ta_id INTEGER NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
)
''')

27
matemat/db/primitives/ReceiptPreference.py Normal file
View file

@ -0,0 +1,27 @@
from enum import Enum
class ReceiptPreference(Enum):
"""
A user's preference for the frequency of receiving receipts.
"""
"""
No receipts should be generated.
"""
NONE = 0
"""
A receipt should be generated for each transaction.
"""
EACH = 1
"""
A receipt should be generated once a month.
"""
MONTHLY = 2
"""
A receipt should be generated once a year.
"""
YEARLY = 3

3
matemat/db/primitives/User.py
View file

@ -2,6 +2,7 @@
from typing import Optional
from dataclasses import dataclass
from matemat.db.primitives.ReceiptPreference import ReceiptPreference
@dataclass
@ -17,6 +18,7 @@ class User:
:param email: The user's e-mail address (optional).
:param admin: Whether the user is an administrator.
:param member: Whether the user is a member.
:param receipt_pref: The user's preference on how often to receive transaction receipts.
"""
id: int
@ -25,3 +27,4 @@ class User:
email: Optional[str] = None
is_admin: bool = False
is_member: bool = False
receipt_pref: ReceiptPreference = ReceiptPreference.NONE

1
matemat/db/primitives/__init__.py
View file

@ -4,3 +4,4 @@ This package provides the 'primitive types' the Matemat software deals with - na
from .User import User
from .Product import Product
from .ReceiptPreference import ReceiptPreference

78
matemat/db/schemas.py
View file

@ -101,3 +101,81 @@ SCHEMAS[2] = [
ON DELETE CASCADE ON UPDATE CASCADE
);
''']
SCHEMAS[3] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) NOT NULL DEFAULT 0,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product_id INTEGER DEFAULT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (product_id) REFERENCES products(product_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER NOT NULL,
last_ta_id INTEGER NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']

8
matemat/db/wrapper.py
View file

@ -6,7 +6,7 @@ import sqlite3
from matemat.exceptions import DatabaseConsistencyError
from matemat.db.schemas import SCHEMAS
from matemat.db.migrations import migrate_schema_1_to_2
from matemat.db.migrations import migrate_schema_1_to_2, migrate_schema_2_to_3
class Transaction(object):
@ -43,7 +43,7 @@ class Transaction(object):
class DatabaseWrapper(object):
SCHEMA_VERSION = 2
SCHEMA_VERSION = 3
def __init__(self, filename: str) -> None:
self._filename: str = filename
@ -77,8 +77,10 @@ class DatabaseWrapper(object):
def _upgrade(self, from_version: int, to_version: int) -> None:
with self.transaction() as c:
# Note to future s3lph: If there are further migrations, also consider upgrades like 1 -> 3
if from_version == 1 and to_version == 2:
if from_version == 1 and to_version >= 2:
migrate_schema_1_to_2(c)
if from_version <= 2 and to_version >= 3:
migrate_schema_2_to_3(c)
def connect(self) -> None:
if self.is_connected():