1. While you are waiting, please install the Windows 10 phone emulators because the installation takes a while and we will be using them during the lab later on. Go to
Please ensure you have updated your VISUAL STUDIO 2015

2. Building UWP apps with SQLite
Medhat and I are excited to demon building UWP apps with the open source DB and Entity Framework.
Medhat Elmasry and Peter Martin

3. Why use a Database? SQLite SQLitePCL Entity Framework 7 Tools Agenda
We will bring all up to speed on DB
SOLite Open Source MS Supported
EF7
And
Tools

4. Why use a DB? Complex Schema
Numerous relationships and constraints
Example: Shopping List
7 tables
100s of records
5 foreign keys
DB creates relationships, reduces space and reduce complexity of the data
Scale from development to test to production without changing the code

5. Why use a DB? Reference Data
Huge amounts of static reference data
Supports large database servers
Example: dictionary app
3 tables
1 table with 500k rows

6. 4/23/2017 2:41 PM
SQLite
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

7. Why SQLite? Worlds’ most popular database
Widely used on iOS, Android, Linux and Windows
Data provider for .Net, Python, Mono…
SQLite library can be reduced below 300 KiB
Microsoft is a principle contributor to this open source project
Public Domain
Small, Fast, Reliable
On mobile devices, it can be used for syncing with DB server
Most popular DB as it is highly available
International development team, you , me and anyone else
The product moves forward with backward compatibility
You can report bugs to this development team
Run-time support windows desktop, phone, Macs, Linux and others
It has low overhead hence you can deploy to mobile devices.

8. Features Rich Features Reliable
Embedded SQL in-process database engine
Read/writes to ordinary disk files
Supports multiple tables, indices, triggers and views
Cross-platform: freely copy DB files between 32-bit & 64-bit
Reliable
Reputation for being very reliable
Large automated test suite
All transactions are natively ACID even if interrupted by system crashes or power failures
Most popular – 32 and 64 bit open source on intel and ARM architectures
Move DB is independent of source and destination environments, hence works the same on multiple platforms
Start and end transaction are set by default at the beginning and the end of a project
It may roll back may occur when you do not expect it

9. SQLite.org SQL Syntax C/C++ API Reference Source & tools download
Documentation
SQL Syntax
C/C++ API Reference
Source & tools download

10. SQLite.org Professional Community Support Models
Proprietary SQLite Extensions
Community
3 separate mailing lists help support SQLite
SQLite Documents is available
Community and Professional Support models

11. Installing the SQLite Library
Visual Studio Extension (.vsix)
Install from Visual Studio
Tools >> Extensions and Updates…
Or download from

12. SQLitePCL The basics 4/23/2017 2:41 PM
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

13. Errors identified at compile time.
Choice of .NET APIs
SQLite-NET
LINQ syntax Lightweight ORM
SQLitePCL SQL statements Thin wrapper around the SQLite C API
var db = new SQLite.SQLiteAsyncConnection(App.DBPath);
var _customer = await  (from c in db.Table<Customer>() where c.Id == customerId  select c).FirstOrDefaultAsync(); if (customer != null) {      var Id = _customer.Id;      var Name = _customer.Name;      }
using (var conn = new SQLiteConnection("demo.db")) {      Customer customer = null;
using (var statement = conn.Prepare( "SELECT Id, Name FROM Customer WHERE Id = ?")) {
statement.Bind(1, customerId);
if (SQLiteResult.DONE == statement.Step()) {
customer = new Customer() {
Id = (long)statement[0],
Name = (string)statement[1] }; }
These are two separate APIs that a .NET developer can use to access SQLite.
The one on the left uses LINQ
The one on the right relies on raw SQL statements being sent from the app to the database. This is prone to errors.
Errors identified at compile time.
…and others!

14. Installing SQLitePCL Nuget package into your project
This is how you can install the SQLitePCL API in Visual Studio using the Nuget package manager.

15. SQLitePCL is really a thin wrapper around the SQLite ‘C’ API
Defining tables
SQLitePCL is really a thin wrapper around the SQLite ‘C’ API
Interact with the database using
Raw SQL statements
Parameterized queries and statements

16. SQLitePCL: Create database and tables
private void LoadDatabase() { // Get a reference to the SQLite database conn = new SQLiteConnection("sqlitepcldemo.db"); string sql TABLE IF NOT EXISTS Customer (Id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, Name VARCHAR( 140 ), City VARCHAR( 140 ), Contact VARCHAR( 140 ) );"; using (var statement = conn.Prepare(sql)) { statement.Step(); } }
Here’s the syntax for creating a database table.

17. SQLitePCL: Insert
// SqlConnection was opened in App.xaml.cs and exposed through property conn var db = App.conn; try { using (var custstmt = db.Prepare("INSERT INTO Customer (Name, City, Contact) VALUES (?, ?, ?)")) { custstmt.Bind(1, customerName); custstmt.Bind(2, customerCity); custstmt.Bind(3, customerContact); custstmt.Step(); } } catch (Exception ex) { // TODO: Handle error }
Here’s an example for inserting data using a SQLite parameterized query.

18. SQLitePCL: Select
public Customer GetCustomer(int customerId) { Customer customer = null; using (var statement = dbconn.Prepare("SELECT Id, Name, City, Contact FROM Customer WHERE Id = ?")) { statement.Bind(1, customerId); if (SQLiteResult.DONE == statement.Step()) { customer = new Customer() { Id = (long)statement[0], Name = (string)statement[1], City = (string)statement[2], Contact = (string)statement[3] }; } } return customer; }
Here’s an example of retrieving a customer record from his/her ID.
This also user parameterized queries.

19. SQLitePCL: Update
// See if the customer already exists var existingCustomer = GetCustomer(customer.Id); if (existingCustomer != null) { using (var custstmt = dbconn.Prepare("UPDATE Customer SET Name = ?, City = ?, Contact = ? WHERE Id=?")) { // NOTE when using anonymous parameters the first has an index of 1, not  custstmt.Bind(1, customer.Name); custstmt.Bind(2, customer.City); custstmt.Bind(3, customer.Contact); custstmt.Bind(4, customer.Id); custstmt.Step(); } }
This is how you can update a customer record, also using a parameterized query.

20. SQLitePCL: Delete
public void DeleteCustomer(int customerId) { using (var statement = dbconn.Prepare("DELETE FROM Customer WHERE Id = ?")) { statement.Bind(1, customerId); statement.Step(); } }
Here you are deleting a customer record also using a parameterized query.
It is always easiest to delete stuff.

21. Relations
Parent – Child relationship between records in one table and those in another
Example:
Each Customer has a collection of one or more Projects
Relationship represented in the database by a column in the child object which stores the ID of the parent
Foreign key constraints enforce the relationship and maintain db integrity

22. Creating foreign key constraints
With SQLiteWinRT, FK constraint is defined in the CREATE TABLE statement
CREATE TABLE IF NOT EXISTS Project 
(Id          INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
      CustomerId  INTEGER,         
    Name        VARCHAR( 140 ),         
       Description VARCHAR( 140 ),                
       DueDate     DATETIME,          
  FOREIGN KEY(CustomerId) REFERENCES Customer(Id)        
      );

23. Enforcing foreign key constraints
Defining a foreign key constraint on the table is not enough!
Foreign key constraints are disabled by default (for backwards compatibility)
Must be enabled at runtime using a PRAGMA
// Turn on Foreign Key constraints  
using (var statement = dbconn.Prepare(sql)) {
statement.Step(); }
You must set foreigh_keys ON to create relationships between tables

24. Other constraints
Type
Description
SQLite-NET
PRIMARY KEY
Defines the column(s) of the primary key
- 1 per table max
Declare by using [PrimaryKey] attribute
UNIQUE
Column constraint enforces unique values in that column
Declare by using [Unique] attribute
NOT NULL
Column constraint prevents null values
No way of declaring with SQLite.NET
CHECK
Column or Table constraint: constraint expression is evaluated on every insert or update, and if ‘0’ returned, constraint fails
See for more information

25. Indexes Index is created automatically for PRIMARY KEY columns
Important to create indices on foreign key columns or columns used to select records from large tables
// Create index on Foreign Key column  
INDEX IF NOT EXISTS fk_customer_project_idx
 ON project (customerId) ASC";
using (var statement = dbconn.Prepare(sql)) {
statement.Step(); }

26. Transactions, relations and other constraints
4/23/2017 2:41 PM
Transactions, relations and other constraints
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

27. No changes can be made to the database except within a transaction
Transactions
No changes can be made to the database except within a transaction
Any command that changes the database will automatically execute within a transaction if one is not already in effect
Transactions can be started manually using the BEGIN TRANSACTION statement
Such transactions persist until the next COMMIT TRANSACTION or ROLLBACK TRANSACTION
Transaction will also rollback if the database is closed

28. Manual transaction – SQLitePCL
SQLite-NET
using (var statement = dbconn.Prepare("BEGIN TRANSACTION")) { statement.Step(); } // Execute one or more statements… using (var custstmt = dbconn.Prepare( "INSERT INTO Customer (Name, City, Contact) VALUES (?, ?, ?)")) { } using (var projstmt = dbconn.Prepare( "INSERT INTO Project (Name, Title, DueDate, CustomerId) VALUES (?, ?, ?, ?)")) { } // COMMIT to accept all changes or ROLLBACK TRANSACTION to discard pending changes using (var statement = dbconn.Prepare(“COMMIT TRANSACTION")) { statement.Step(); }

29. DEMO: UWP app with SQLitePCL
4/23/2017 2:41 PM
DEMO: UWP app with SQLitePCL
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

30. Entity Framework 7 (EF7) 4/23/2017 2:41 PM
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

31. New Platforms & New Data Stores

32. Full & Core .NET Frameworks ASP.NET 5 Supports:
EF7: New Platforms
Full & Core .NET Frameworks
ASP.NET 5
Supports:
Traditional desktop application
Windows 10 UWP devices
Mac
Linux

33. Relational & non-relational
EF7: New Data Stores
Relational & non-relational
Not a magic abstraction
High level services that are useful on all/most stores
Non-common concerns handled by provider extensions
Example providers
Relational (SQL Server, SQLite, Postgres, etc.)
Azure Table Storage
Redis
In Memory (for testing)
See video

34. Same experience built over a new lightweight and extensible core
A developer who is familiar with EF 4, 5, 6 should find EF7 very familiar.

35. Same top level experience as EF6.x
EF7: New Core
Same top level experience as EF6.x
Still DbContext/DbSet etc.
New core
Core = metadata, change tracking, query pipeline, etc.
Easier to replace/extend components
Replace confusing APIs & behavior
Optimized for memory and CPU usage
Pay-per-play components

36. Frameworks that use SQLite
Azure App Service Mobile Apps
Entity Framework 7
Easy to implement offline data sync uses SQLite for local data storage
Lightweight ORM. Supports offline data sync using SQLite for local data storage
See BUILD session Entity Framework 7

37. 4/23/2017 2:41 PM
DEMO: EF7
ProductId ProductName Description UnitPrice Quantity Category Supplier
Product
UnitName
Unit
CategoryId CategoryName
Category 1 *
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

38. 4/23/2017 2:41 PM
SQLite Tools
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

39. sqlite3.exe
Download command line tool from sqlite.org

40. Some popular ones include: SQLite Studio http://sqlitestudio.pl/
IDEs
For those who prefer a GUI, see the list of IDEs at
Some popular ones include:
SQLite Studio
SQLite Expert

41. Useful debugging tool

42. Transferring databases to desktop
For Desktop: go to %USERPROFILE%\AppData\Local\Packages\{PackageId}
For Mobile: Windows Phone Power Tools for WP8.1 – Still works with Windows 10 devices Although you must install the VS2013 – Windows Phone 8.0 SDK to install a device connectivity DLL dependency.

43. DEMO: SQLite Studio

44. Where to Next SQLite http://sqlite.org Learn more about EF7
aka.ms/AboutEF7
See BUILD session Entity Framework 7
A developer’s guide to Windows 10

45. IT-IQ sponsoring beer & snacks at Boston Pizza
Good opportunity to meet with recruiters from