28 lines
554 B
MySQL
28 lines
554 B
MySQL
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CREATE TRIGGER revokeTransfer
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BEFORE DELETE ON Transfer
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BEGIN
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INSERT INTO __DO_NOT_MANIPULATE__trigger_memory VALUES (null,null,OLD.amount);
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UPDATE Debit
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SET paid = paid - OLD.amount
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WHERE billId=OLD.billId
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;
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UPDATE Credit
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SET value = value - OLD.amount
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WHERE credId = (
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SELECT targetCredit
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FROM Debit
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WHERE billId=OLD.billId
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);
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UPDATE Credit
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SET spent = spent - OLD.amount
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WHERE credId = OLD.credId;
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DELETE FROM __DO_NOT_MANIPULATE__trigger_memory;
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END;
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