71 lines
4.5 KiB
SQL
71 lines
4.5 KiB
SQL
PRAGMA foreign_keys = ON;
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PRAGMA recursive_triggers = ON;
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-- To understand the sql below, see the schema.sql file.
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INSERT INTO Account VALUES
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("Club", "Main account", "eV", 1, NULL),
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("john", "John Tester", "Member", 44, NULL),
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("alex", "Alex Webber", "Member", 6, "DE1234567890123456");
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INSERT INTO Category ("label") VALUES ("Membership fees"), ("Service");
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INSERT INTO Credit VALUES (1, "Club", "2016-01-01", "Membership fees May 2016 until incl. April 2017", 1, 0, 0),
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(2, "john", "2016-04-23", "Membership fee 2016f.", 1, 7200, 0),
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(3, "alex", "2016-01-15", "Payment for Server Hosting 2016", 1, 0, 0);
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INSERT INTO Debit VALUES ("MB1605-john", "john", 1, "2016-05-01", "Membership fee May 2016", 1, 600, 0),
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("MB1606-john", "john", 1, "2016-05-01", "Membership fee June 2016", 1, 600, 0),
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("MB1607-john", "john", 1, "2016-05-01", "Membership fee July 2016", 1, 600, 0),
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("MB1608-john", "john", 1, "2016-05-01", "Membership fee August 2016", 1, 600, 0),
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("MB1609-john", "john", 1, "2016-05-01", "Membership fee September 2016", 1, 600, 0),
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("MB1610-john", "john", 1, "2016-05-01", "Membership fee October 2016", 1, 600, 0),
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("MB1611-john", "john", 1, "2016-05-01", "Membership fee November 2016", 1, 600, 0),
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("MB1612-john", "john", 1, "2016-05-01", "Membership fee December 2016", 1, 600, 0),
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("MB1701-john", "john", 1, "2016-05-01", "Membership fee January 2017", 1, 600, 0),
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("MB1702-john", "john", 1, "2016-05-01", "Membership fee February 2017", 1, 600, 0),
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("MB1703-john", "john", 1, "2016-05-01", "Membership fee March 2017", 1, 600, 0),
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("MB1704-john", "john", 1, "2016-05-01", "Membership fee April 2017", 1, 600, 0),
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("TWX2016/123", "Club", 3, "2016-01-15", "Server Hosting 2016", 2, 23450, 0);
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.separator " "
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SELECT "ID: availbl promise debt";
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SELECT "--------------------------------";
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SELECT ID || ":", available, '+' || promised, arrears * -1 FROM Balance WHERE ID in ("john", "Club");
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SELECT "# Reflect john paying its bills all at once ...";
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INSERT INTO Transfer (billId, credId) VALUES ("MB1605-john", 2), ("MB1606-john", 2), ("MB1607-john", 2), ("MB1608-john", 2), ("MB1609-john", 2), ("MB1610-john", 2), ("MB1611-john", 2), ("MB1612-john", 2), ("MB1701-john", 2), ("MB1702-john", 2), ("MB1703-john", 2), ("MB1704-john", 2);
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SELECT ID || ":", available, '+' || promised, arrears * -1 FROM Balance WHERE ID in ("john", "Club");
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SELECT "# Charge Club with server hosting provided by alex ...";
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INSERT INTO Transfer (billId, credId) VALUES ("TWX2016/123", 1);
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SELECT ID || ":", available, '+' || promised, arrears * -1 FROM Balance WHERE ID in ("Club", "alex");
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SELECT "# Some updates and deletes that could, unless denied, destroy consistency ...";
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UPDATE Debit SET paid = 20000 WHERE billId="TWX2016/123";
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UPDATE Debit SET value = 20000 WHERE billId="TWX2016/123";
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DELETE FROM Debit WHERE billId="TWX2016/123"; -- *SHOULD NOT* work
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SELECT "# After revoking transactions, you are free to change or delete debts and credits ...";
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BEGIN TRANSACTION;
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DELETE FROM Transfer WHERE billId="TWX2016/123";
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UPDATE Debit SET value = 20000 WHERE billId="TWX2016/123";
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DELETE FROM Debit WHERE billId="TWX2016/123"; -- *SHOULD* work
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SELECT ID || ":", available, '+' || promised, arrears * -1 FROM Balance WHERE ID in ("Club", "alex");
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ROLLBACK TRANSACTION;
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SELECT '# But let''s rollback that what-if excurse. This is how it currently is ...';
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SELECT ID || ":", available, '+' || promised, arrears * -1 FROM Balance WHERE ID in ("Club", "alex");
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SELECT '###################################################################';
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SELECT '# Now it is your turn: Study the sql code yielding the output above';
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SELECT '# then enter new members and let them pay the fees.';
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SELECT '# (PLUS: Let have one discalculia and pay too little or too much.)';
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SELECT '# Once the club has enough money to pay alex'' hosting service,';
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SELECT '# update (i.e. revoke and reenter) the respective transaction.';
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SELECT '# Finally issue a bank transfer to alex. Hint: An outgoing transfer';
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SELECT '# is simply a debt charging alex'' own virtual account and without';
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SELECT '# targetCredit (NULL). PLUS: What happens if the description of';
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SELECT '# the bank transfer does not contain any or only a wrong IBAN?';
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