Uber system design architecture for embedded system

CS 6360.002 Database Design:Uber
Team:
Harshita Rastogi (HXR190001)
Shivam Gupta (SXG190040)
Tejas Gupta (TXG180021)

PROJECT DESCRIPTION:
Uber is a ride providing (car-for-hire) company that provides taxi service to the
customers. Unlike regular taxi service, Uber lets you join as a driver with your
personal registered vehicle and one can make money by completing the customer
request.

MAPPING EER DIAGRAM TO RELATIONAL SCHEMA
*Primary Key - Bold *Foreign Key - Italics and Underlined
UberUser { UberID, FName, LName, PhNo, Email, Address , DOB }
Customer { CID, CustomerType, PromoCode, PromoDiscount }
FOREIGN KEY (CID) REFERENCES UberUser(UberID)
Driver { DID , SSN, DLNo, DLExpiry }
FOREIGN KEY (DID) REFERENCES UberUser(UberID)
Vehicle {VID, DID, Model, Color , ManufYear, PurDate, Active, Condition , Cpty, InsuranceNo, InsuranceExpiry, LastChecked }
FOREIGN KEY (DID) REFERENCES Driver(DID)
TripRequests { TripID, CID, DID, TripType, PickupLoc, DropoffLoc, Distance, EstFare, TID }
FOREIGN KEY (TID) REFERENCES PaymentMethod(TID)
FOREIGN KEY (CID) REFERENCES Customer(CID)

CompletedTrips { TripID, DriverArrAt, PickupTime, DropOffTime, ActFare, Tip, Surge }
FOREIGN KEY (TripID) REFERENCES TripRequests(TripID)
IncompleteTrips { TripID, BookingTime, CancelTime, Reason }
PaymentMethod { TID, CardNo, CVV, ExpDate, CardType, BillingAdd }
PersonalPayment { TID , NameOnCard }
BusinessPayment { TID, CompanyName }
Rating { TripID , DriverRating, CustomerRating, DriverFeedback, CustomerFeedback }
FOREIGN KEY (TripID) REFERENCES CompletedTrips(TripID)
Shift { DID , LoginTime, LogoutTime }

FUNCTIONAL DEPENDENCIES AND NORMALIZATION
All the tables contain atomic values. There does not exist any partial dependency in the tables. Therefore, the schema is already obeys
1NF and 2NF.
Driver: There exists transitive dependency. FD2 violates 3NF.
Driver { DID , SSN, DLNo, DLExpiry }
FD1: DID---> DLNo
FD2: DLNo---> DLExpiry
So, the new tables are:
Driver{ DID, SSN, DLNo}
DrivingLicenceInfo{ DLNo, DLExpiry}
Customer: There exists transitive dependency. FD2 violates 3NF.
Customer { CID, CustomerType, PromoCode, PromoDiscount }
FD1: CID ---> PromoCode
FD2: PromoCode ---> PromoDiscount
Customer { CID, CustomerType, PromoCode }
Offer { PromoCode, PromoDiscount }

Vehicle: There exists transitive dependency. FD2 violates 3NF.
Vehicle { VID, DID, Model, Color , ManufYear, PurDate, Active, Condition , Cpty, InsuranceNo, InsuranceExpiry, LastChecked }
FD1: VID---> InsuranceNo
FD2: InsuranceNo> InsuranceExpiry
Vehicle{ VID, DID, Model, Color , ManufYear, PurDate, Active, Condition , Cpty, InsuranceNo, LastChecked }
InsuranceInfo{ InsuranceNo, InsuranceExpiry}
PaymentMethod: There exists transitive dependency. FD2 violates 3NF.
PaymentMethod{ TID, CardNo, CVV, ExpDate, CardType, BillingAdd }
FD1: TID ---> CardNo
FD2: CardNo ---> CVV, ExpDate, CardType, BillingAdd
PaymentMethod { TID , CardNo }
CardInfo { CardNo, CVV, ExpDate, CardType, BillingAdd }
CompletedTrips: There exists transitive dependency. FD2 violates 3NF.
CompletedTrips { TripID, DriverArrAt, PickupTime, DropOffTime, ActFare, Tip, Surge }
FD1: TripID ---> PickupTime
FD2: PickupTime ---> Surge
So the new tables are:
CompletedTrips { TripID, DriverArrAt, PickupTime, DropOffTime, ActFare, Tip }
SurgeInfo { PickupTime , Surge }

NORMALIZED RELATIONAL SCHEMA
*Primary Key - Bold
*Foreign Key - Italics and Underlined
UberUSer { UberID, FName, LName, PhNo, Email, Address , DOB}
Customer { CID, CustomerType, PromoCode}
FOREIGN KEY (CID) REFERENCES UberUser(UberID)
Offer { PromoCode, PromoDiscount }
FOREIGN KEY (PromoCode) REFERENCES Customer(PromoCode)
Driver { DID , SSN, DLNo}
FOREIGN KEY (DID) REFERENCES UberUser(UberID)
DrivingLicenceInfo{ DLNo, DLExpiry}
FOREIGN KEY (DLNo) REFERENCES Driver(DLNo)
Vehicle{ VID, DID, Model, Color , ManufYear, PurDate, Active, Condition , Cpty, InsuranceNo, LastChecked }
InsuranceInfo {InsuranceNo, InsuranceExpiry}
FOREIGN KEY (InsuranceNo) REFERENCES Vehicle(InsuranceNo)
TripRequests { TripID, CID, DID, TripType, PickupLoc, DropoffLoc, Distance, EstFare, TID }
FOREIGN KEY (CID) REFERENCES Customer(CID)

CompletedTrips { TripID, DriverArrAt, PickupTime, DropOffTime, ActFare, Tip }
SurgeInfo { PickupTime , Surge }
FOREIGN KEY (PickupTime) REFERENCES CompletedTrips(PickupTime)
IncompleteTrips { TripID, BookingTime, CancelTime, Reason }
PaymentMethod { TID, CardNo }
CardInfo { CardNo, CVV, ExpDate, CardType, BillingAdd }
FOREIGN KEY (CardNo) REFERENCES PaymentMethod(CardNo)
PersonalPayment { TID , NameOnCard }
BusinessPayment { TID, CompanyName }
RATING { TripID , DriverRating, CustomerRating, DriverFeedback, CustomerFeedback }
FOREIGN KEY (TripID) REFERENCES CompletedTrips(TripID)
SHIFT { DID , LoginTime, LogoutTime }

Snapshots of running stored procedures with output and code created on Oracle SQL Developer
Stored Procedure to Calculate Average Ratings of all Drivers:
create or replace PROCEDURE Average_Rating AS
CURSOR DrivRating IS SELECT AVG(R.DriverRating) as AvgRating, T.DID FROM TripRequests T, Rating R WHERE T.TripID=R.TripID GROUP BY T.DID;
thisRating DrivRating%ROWTYPE;
BEGIN
OPEN DrivRating;
LOOP
FETCH DrivRating INTO thisRating;
EXIT WHEN (DrivRating%NOTFOUND);
dbms_output.put_line(thisRating.AvgRating || ' is the Average rating for the driver ID:' || thisRating.DID);
END LOOP;
CLOSE DrivRating;
END;
begin
Average_Rating;
End;

2. Stored Procedure to Calculate Total Fare for a given Ride:
create or replace PROCEDURE Calculate_Fare(Base_fare IN number, Service_Tax IN number, Cost_per_mile IN number, Cost_per_min IN number) AS
CURSOR Trip_total_fare IS
SELECT
"A1". "TRIPID" "TRIPID",
"A1"."DURATION" "DURATION",:"A2"."DISTANCE" "DISTANCE",
"A1"."SURGE" "SURGE"
FROM
"TRIPREQUESTS" "A2",
"COMPLETEDTRIPS" "A1"
WHERE
"A2"."TRIPID" = "A1"."TRIPID";
thisTrip Trip_total_fare%rowtype;
thisTotalFare TripRequests.EstFare%TYPE;
BEGIN
OPEN Trip_total_fare;
LOOP
FETCH Trip_total_fare INTO thisTrip;
EXIT WHEN (Trip_total_fare%NOTFOUND);
thisTotalFare:= (Base_fare + Service_Tax + Cost_per_mile*thisTrip.distance + Cost_per_min*thisTrip.duration )*(1 + thisTrip.Surge);
dbms_output.put_line(thisTotalFare || ' is the total fare for the Trip ID:' || thisTrip.TripID);
END LOOP;
CLOSE Trip_total_fare;
END;
Begin
Calculate_Fare(5,10,1,1);
End;

Snapshots of running Triggers with errors fired and code on Oracle SQL Developer
1. Trigger to check that the capacity of a vehicle has to be greater than 4:
create or replace TRIGGER Capacity_Check
before update
on Vehicle for each row
Begin
if (:new.cpty < 4) then
raise_application_error( -20001, 'This is a custom error for Capacity');
end if;
End;
Query: update VEHICLE set cpty = 3 where VID= 'V550';

2. Trigger to check that the Driver’s License should not have expired:
create or replace TRIGGER DL_Renewal
before insert or update
on DRIVER for each row
Begin
if (:new.DLEXPIRY < sysdate) then
raise_application_error( -20098, 'This is a custom error for DL EXPIRY');
end if;
End;
Query: Update VEHICLE set INSURANCEEXPIRY = '20-MAY-16' where VID= 'V550';

3. Trigger to check that the Insurance for the vehicle should not have expired:
create or replace TRIGGER Insurance_Renewal
before insert or update
on Vehicle for each row
Begin
if (:new.INSURANCEEXPIRY < sysdate) then
raise_application_error( -20099, 'This is a custom error for Insurance');
end if;
end;
Query: update DRIVER set DLEXPIRY = '20-MAY-16' where DID= 'U233';

Uber system design architecture for embedded system

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