COMP 446 / ELEC 446
Mobile Device Applications
Scott Cutler
Professor in the Practice of Computer Technology
Department of Computer Science
Department of Electrical and Computer Engineering
cutler@rice.edu
10/10/12
Wednesday 2-3:30, DH 1046
Agenda
 Events of the Week
 Next week’s assignment and class
 Database Technology
 Questions on Assignment #5
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Events of the Week
 Official Apple Tribute to Steve Jobs video 10-05-2012
 iPad Mini Slated for Oct. 17?
 Apple reportedly orders 10M iPad Minis for fourth quarter
 Google Maps to insert Street View into mobile Web app
 Google Motorola Drops Apple Lawsuit
 Microsoft Developing Windows Phone 8 Smartphone
 Samsung Posts $7.3 Billion Third-Quarter Profit, This Quarter Will Be
Tougher
 HP CEO's Turnaround Message Flops On Wall Street
 T-Mobile, MetroPCS Deal Leaves Sprint Scrambling
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Current Roster
 Victor Acuna
 Ryan Artecona
 Gbenga Badipe
 Peter Chang
 Joan Chao
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Current Roster (2)
 Alex Chiu
 Heaven Chen
 Lingo Dai
 Weibo He
 Sahil Hingorani
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Current Roster (3)
 Abdul Nimeri
 Bill Robertson
 Frank Salinas
 Tyler Siegert
 Austin Witt
 Matthew Zhao
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COMP 446 Syllabus (updated)
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Lecture 1 - 8/22/12 - Introduction
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Lecture 2 - 8/29/12 - Assignment 1 issues and questions from videos
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Watch before:
3, 4 (demo part)
Assignment:
#3 – Graphing Universal Calculator
Assignment due: Tuesday, 9/18 6:00 am (Monday 30:00)
Lecture 4 - 9/12/12 - Assignment 3 issues and questions from videos
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Watch before:
1, 2
Assignment:
#2 – Function Calculator
Assignment due: Friday, 9/7 6:00 am (Thursday 30:00)
Lecture 3 - 9/05/12 - Assignment 2 issues and questions from videos
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Watch before:
None
Assignment:
#1 - Calculator
Assignment due: Friday, 8/31 6:00 am (Thursday 30:00)
Watch before:
4 (post demo), 5, 6
Assignment:
Continue with #3 – Graphing Universal Calculator
Assignment due: Tuesday, 9/18 6:00 am (Monday 30:00)
Lecture 5 - 9/19/12 - Assignment 3 issues and questions from videos
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Watch before:
Watch 7 before class, 8 after class
Assignment:
#4 – Flickr Top Places
Assignment due: Friday, 10/05 6:00 am (Thursday 30:00)
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COMP 446 Syllabus (updated)
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Lecture 6 - 9/26/12 - Assignment 4 technology preview
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Watch before:
Assignment:
8, 9 very beginning of 10
1: #6 – Flickr Core Data
- To be broken into required and optional parts
- Optional part required for A+
2: Final Project Topic (due before next class)
Assignment due: Friday, 10/19 6:00 am (Thursday 30:00)
Lecture 8 - 10/10/12 - Assignment 6 technology preview and SQL
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8, 9 very beginning of 10 (for Assignment 4)
#5 – Flickr Map Places
Tasks 3, 4 and 8 are optional for extra credit (required for A+)
Assignment due: Thursday, 10/11 6:00 am (Wednesday 30:00) (10/12 OK)
Lecture 7 - 10/03/12 - Assignment 5 technology preview
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Watch by 10/3:
Assignment:
Watch for #5:
10 (after Tab Bar), 11, 12
Assignment:
Final Project Proposal
Assignment due: Tuesday, 10/23 6:00 am (Monday 30:00)
Lecture 9 - 10/17/12 - iOS 6, Server technology
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Watch for #6:
13, 14
Assignment:
iOS 6 app
Assignment due: Friday, 10/26 6:00 am (Thursday 30:00)
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COMP 446 Syllabus (updated)
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Lecture 10 - 10/24/12 - HTML 5, Windows Phone
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Lecture 11 - 10/31/12 – Android
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Assignment:
Continue working on Final Project
Assignment due: Wednesday, 11/28 2:00pm
Lecture 14 - 11/21/12 – No class, but continue on final project
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Assignment:
Continue working on Final Project
Assignment due: Wednesday, 11/28 2:00pm
Lecture 13 - 11/14/12 - Individual meetings on Final Project
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Watch before:
Optional 17, 18
Assignment:
Continue working on Final Project
Assignment due: Wednesday, 11/28 2:00pm
Lecture 12 - 11/7/12- Android vs. iOS vs. Windows Phone group debate
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Watch before:
Optional 15, 16
Assignment:
Major Final Project Feature
Assignment due: Friday, 11/2 6:00 am (Thursday 30:00)
Assignment:
Continue working on Final Project
Assignment due: Wednesday, 11/28 2:00pm
Lecture 15 - 11/28/12 - Final Presentations
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Assignment:
Document Final Project
Assignment due: By time assigned for COMP 446 final (there is NO final exam)
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Final Project Timeline New
9/19
9/26
10/03 10/10 10/17 10/24 10/31 11/7
11/14 11/21 11/28 12/5
- #4 10/05
- #5 10/12
- FP Topic 10/10
- #6 10/17
- FP Proposal 10/23
- Major Feature 11/2
- Individual Meetings 11/14
- Final Presentation 11/28
- Documentation due Finals Day
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Deploying to Device
 Read deployment information at developer.apple.com
 4 Steps
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Load intermediate certificate
Request development certificate
Send me device id to register
Use Xcode to deploy. It will use team provisioning
profile
 If you have problems, we will have a deployment session
after class.
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Some iOS Devices Available
 iPhone
 iPhone 3G
 iPhone 3GS
 AT&T iPhone 4
 Verizon 4S may be available
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Week 9
 Watch CS193p lectures #13 and #14
 Make progress on CS193p Assignment #6
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Try and complete before 10/17 class. Due Friday, 10/19 6:00 am
 Next week’s lecture – iOS 6 and Server Technology
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What is coming up in the assignments?
 Assignment #5 – Fast Flickr Map
Multi Threading / Grand Central Dispatch
 MapKit
 Deployment and cache aspects optional (Tasks 3, 4 and 8)
 Submissions which do not properly size initial view of images in
both landscape and portrait on the iPad will be rejected.
 Assignment #6 – Core Data Flickr
 UIDocument
 Core Data
 Aspects outside of core data version of #5 optional
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 You are on your own for assignment #6
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Image Scaling
 Large number of students still not properly sizing images.
 I am testing in both portrait and landscape.
 Let bounds auto scale to frame of parent, but check
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bounds as they may change with rotation
Aspect ratio must be maintained
Check aspect ratios to see which dimension dominates
scaling.
Scale up or down to make critical dimension just fit
Make sure to set your scale factor for smooth changes.
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SQL 101
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SQL Documentation
 SQL Server 2008 Main Page
http://www.microsoft.com/sqlserver/2008/en/us/default.aspx
 Online Documentation (launch point for all versions)
 http://technet.microsoft.com/en-us/library/bb545450.aspx
 Microsoft SQL Server 2008 Books Online (October 2009)
 Download
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http://www.microsoft.com/downloads/en/details.aspx?FamilyId=
765433F7-0983-4D7A-B628-0A98145BCB97&displaylang=en
Online Root
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http://technet.microsoft.com/en-us/library/bb545450.aspx
 Transact-SQL Reference
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http://technet.microsoft.com/en-us/library/bb510741.aspx
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SQL Language Elements (from
Wikipedia article)
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Clauses, which are in some cases optional, constituent components of
statements and queries.
Expressions which can produce either scalar values or tables consisting of
columns and rows of data.
Predicates which specify conditions that can be evaluated to SQL threevalued logic (3VL) Boolean truth values and which are used to limit the
effects of statements and queries, or to change program flow.
Queries which retrieve data based on specific criteria.
Statements which may have a persistent effect on schemas and data, or
which may control transactions, program flow, connections, sessions, or
diagnostics.
SQL statements also include the semicolon (";") statement terminator.
Though not required on every platform, it is defined as a standard part of
the SQL grammar.
Insignificant whitespace is generally ignored in SQL statements and
queries, making it easier to format SQL code for readability.
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Queries (credit Wikipedia)
 A query includes a list of columns to be included in the final
result immediately following the SELECT keyword. An asterisk
("*") can also be used to specify that the query should return all
columns of the queried tables. SELECT is the most complex
statement in SQL, with optional keywords and clauses that
include:
 The FROM clause which indicates the table(s) from which data
is to be retrieved. The FROM clause can include optional JOIN
subclauses to specify the rules for joining (relating) tables.
 The WHERE clause includes a comparison predicate, which
restricts the rows returned by the query. The WHERE clause
eliminates all rows from the result set for which the comparison
predicate does not evaluate to True.
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Queries (credit Wikipedia)
 The GROUP BY clause is used to project rows having common
values into a smaller set of rows. GROUP BY is often used in
conjunction with SQL aggregation functions or to eliminate
duplicate rows from a result set. The WHERE clause is applied
before the GROUP BY clause.
 The HAVING clause includes a predicate used to filter rows
resulting from the GROUP BY clause. Because it acts on the
results of the GROUP BY clause, aggregation functions can be
used in the HAVING clause predicate.
 The ORDER BY clause identifies which columns are used to
sort the resulting data, and in which direction they should be
sorted (options are ascending or descending). Without an
ORDER BY clause, the order of rows returned by an SQL query
is undefined.
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Transact SQL (MSFT) Select Statement
Retrieves rows from the database and enables the selection of one
or many rows or columns from one or many tables. The full syntax
of the SELECT statement is complex, but the main clauses can be
summarized as:
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[ WITH <common_table_expression>]
 SELECT select_list
 [ INTO new_table ]
 [ FROM table_source ]
 [ WHERE search_condition ]
 [ GROUP BY group_by_expression ]
 [ HAVING search_condition ]
 [ ORDER BY order_expression [ ASC | DESC ] ]
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The UNION, EXCEPT and INTERSECT operators can be used between queries to combine
or compare their results into one result set.
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Examples
 SELECT * FROM
 SELECT Name,
Production.Product
 ORDER BY Name;
ProductNumber, ListPrice
AS Price
 FROM Production.Product
 ORDER BY Name;
 SELECT p.*
 SELECT Name,
 FROM Production.Product
ProductNumber, ListPrice AS
Price
 FROM Production.Product
 WHERE ProductLine = 'R' AND
DaysToManufacture < 4
 ORDER BY Name;
AS p
 ORDER BY Name;
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Examples
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SELECT p.Name AS ProductName,
NonDiscountSales = (OrderQty *
UnitPrice), Discounts = ((OrderQty *
UnitPrice) * UnitPriceDiscount)
FROM Production.Product AS p INNER
JOIN Sales.SalesOrderDetail AS sod ON
p.ProductID = sod.ProductID
ORDER BY ProductName DESC;
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SELECT 'Total income is', ((OrderQty *
UnitPrice) * (1.0 - UnitPriceDiscount)), '
for ', p.Name AS ProductName
FROM Production.Product AS p INNER
JOIN Sales.SalesOrderDetail AS sod ON
p.ProductID = sod.ProductID
ORDER BY ProductName ASC;
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SELECT ProductID, SpecialOfferID,
AVG(UnitPrice) AS 'Average Price',
SUM(LineTotal) AS SubTotal
FROM Sales.SalesOrderDetail
GROUP BY ProductID, SpecialOfferID
ORDER BY ProductID
SELECT ProductModelID,
AVG(ListPrice) AS 'Average List Price'
FROM Production.Product
WHERE ListPrice > $1000
GROUP BY ProductModelID
ORDER BY ProductModelID;
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Examples
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SELECT ProductID, AVG(UnitPrice)
AS 'Average Price'
FROM Sales.SalesOrderDetail
WHERE OrderQty > 10
GROUP BY ProductID
ORDER BY AVG(UnitPrice);
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SELECT ProductID
FROM Sales.SalesOrderDetail
GROUP BY ProductID
HAVING AVG(OrderQty) > 5
ORDER BY ProductID;
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SELECT SalesOrderID,
CarrierTrackingNumber
FROM Sales.SalesOrderDetail
GROUP BY SalesOrderID,
CarrierTrackingNumber
HAVING CarrierTrackingNumber LIKE
'4BD%'
ORDER BY SalesOrderID ;
SELECT ProductID
FROM Sales.SalesOrderDetail
WHERE UnitPrice < 25.00
GROUP BY ProductID
HAVING AVG(OrderQty) > 5
ORDER BY ProductID;
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Examples
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SELECT ProductID, AVG(OrderQty)
AS AverageQuantity, SUM(LineTotal)
AS Total
FROM Sales.SalesOrderDetail
GROUP BY ProductID
HAVING SUM(LineTotal) >
$1000000.00 AND AVG(OrderQty) < 3;
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SELECT ProductID, Total =
SUM(LineTotal)
FROM Sales.SalesOrderDetail
GROUP BY ProductID
HAVING SUM(LineTotal) >
$2000000.00;
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SELECT ProductID, SUM(LineTotal)
AS Total
FROM Sales.SalesOrderDetail
GROUP BY ProductID
HAVING COUNT(*) > 1500;
SELECT DISTINCT c.LastName,
c.FirstName
FROM Person.Contact AS c JOIN
HumanResources.Employee AS e ON
e.ContactID = c.ContactID
WHERE 5000.00 IN (SELECT Bonus FROM
Sales.SalesPerson AS sp WHERE
e.EmployeeID = sp.SalesPersonID);
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SQL Injection Attacks
 Easy and tempting to generate SQL queries in
websites from entered values
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With nameTextbox, SQL = “select * from people where name
=” + nameTextbox.text
 Rogue web bots respond with text that takes over
server
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Adds closing tags followed by dangerous SQL commands
 Important to use Query Parameters instead or
tightly check input fields.
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Preview of Videos 13 and 14
 Many of the slides to follow come directly
from the Fall 2011 Stanford CS193p slide
deck.
 Some come from earlier versions of CS193p
which I think were a bit clearer than the
current deck
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Core Data
 An Object-oriented approach to database technology
 Powerful, but exposes enough to make it complex
 How does it work?
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Create a visual mapping (using Xcode tool) between
database and objects.
Create and query for objects using object-oriented API.
Access the “columns in the database table” using
@propertys on those objects.
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Apple Speak for Core Data
 Tables are Entities
 Columns or fields are Attributes
 Joins are relationships
 Sort via array of sort descriptors
 Where clause via predicates
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The Object-Oriented Structure
 Greatly simplified in iOS 5.0
 Objects managed via
NSManagedObjectContext
 Total database including
NSManagedObjectContext managed by
UIManagedDocument
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UIManagedDocument
 Creates of opens database
 Asynchronous actions – completion handlers
to know when complete
 Uses NSNotificationCenter to keep
asynchronous operations coordinated
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Used to keep TableView cells automatically
updated.
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NSManagedObject Subclasses
 Entities (tables) are managed objects or sets
of managed objects
 Class definitions created by Xcode
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Need to be regenerated often
Use “categories” to extend these classes
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Categories
 Obective-C methods resolved at runtime
 Categories allow you to add a method
understood by a class independent of the
class
 Can reference class methods and iVars, but
can not add new iVars
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Can add new methods and computed
properties
 Most common usage is to create entity values
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NSFetchRequest
 Objective-C means of doing a Query
 Elements of an NSFetchRequest
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Entity to fetch
NSPredicate (optional filtering)
NSSortDescriptor (ordered NSArray of results order)
Fetch count (although objects are faulted in when needed)
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@“Photo”];
request.fetchBatchSize = 20;
request.fetchLimit = 100;
request.sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
request.predicate = ...;
Returns NSArray of NSManagedObjects
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NSPredicate
NSString *serverName = @“flickr-5”;
NSPredicate *predicate =
[NSPredicate predicateWithFormat:@“thumbnailURL contains %@”,
serverName];
 Examples
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@“uniqueId = %@”, [flickrInfo objectForKey:@“id”] // unique a photo in the database
@“name contains[c] %@”, (NSString *) // matches name case insensitively
@“viewed > %@”, (NSDate *) // viewed is a Date attribute in the data mapping
@“whoTook.name = %@”, (NSString *) // Photo search (by photographer’s name)
@“any photos.title contains %@”, (NSString *) // Photographer search (not a Photo
search)
Many more options. Look at the class documentation for NSPredicate.
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Core Data Thread Safety
 NOT Thread Safe.
 Must run in thread that created
NSManagedObjectContext
 [context performBlock:^{ … }];
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Core Data and Table View
 NSFetchedResultsController hooks an NSFetchRequest
up to a UITableViewController
 Answers numberOfSectionsInTableView and
numberOfRowsInSection
 Helps with table cell values via objectAtIndexPath
 Watches changes in Core Data and auto-updates table
view
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CoreDataTableViewController
 Documented in NSFetchedResultsController
 Combines UITableVIewCOntroller with
NSFetchedResultsConrtoller and wires them
together.
 Provided for you to use in assignment #6
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Video 14
 Major demo getting photos by photographer
using core data
 Contains all of the technologies needed to
convert Assignment #5 to #6.
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Assignment #5 Questions
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