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Ivan Marković
MSP Lead
Software Developer at SPAN d.o.o.
ivan.markovic@studentpartner.com
Vidjeli smo…
• Tipovi aplikacija
• Metode razvoja softverskog proizvoda+ALM
u Microsoft alatima
• C#
• Baze podataka
Agenda
1) Entity Framework
2) LINQ
3) EF+LINQ Demo(s)
Entity framework
What is Entity Framework?
• Entity framework is an Object/Relational
Mapping (O/RM) framework
• Automated mechanism for accessing &
storing the data in the database
What is ORM?
• ORM is a tool for storing data from domain
objects to relational database (like MS SQL
Server)
• O/RM includes three main parts: Domain
class objects, Relational database objects and
Mapping information
Why ORM?
• ORM allows us to keep our database design
separate from our domain class design
• This makes the application maintainable and
extendable
ORM vs Traditional Data Access
Techniques
• ORM often reduces the amount of code that
needs to be written
• High level of abstraction obscuring what is
actually happening in the implementation
code
Entity Framework Architecture
SQL Relationships
• One-to-Many Relationship
• Many-to-Many Relationship
• One-to-One Relationship
EF 6 Tools for VS 2012 & 2013
• http://www.microsoft.com/en-
us/download/confirmation.aspx?id=40762
Database first
• An existing database can be used
• Code can be auto-generated.
• Extensible using partial classes/ T4 templates
• The developer can update the database
manually
• There is a very good designer, which sync with
the underlining database
Code first
• There is full control of the model from the
Code; no EDMX/designer
• No manual intervention to DB is required
• The database is used for data only
• POCO Class
Model first
• Good support with EDMX designer
• We can visually create the database model
• EF generates the Code and database script
• Extensible through partial classes
• We can modify the model and update the
generated database.
Code first from existing database
• POCO Classes from existing database
Which one to choose?
• It depends on you…
LINQ
• Language-Integrated Query (LINQ)
• Set of features that extends powerful query
capabilities to the language syntax of C# and
Visual Basic.
LINQ
Three parts
• All LINQ query operations consist of three
distinct actions:
– Obtain the data source.
– Create the query.
– Execute the query.
Three parts
• // 1. Data source.
• int[] numbers = new int[7] { 0, 1, 2, 3, 4, 5, 6 };
• // 2. Query creation.
• // numQuery is an IEnumerable<int>
• var numQuery =
• from num in numbers
• where (num % 2) == 0
• select num;
• // 3. Query execution.
• foreach (int num in numQuery)
• {
• Console.Write("{0,1} ", num);
• }
The Data Source
• Types that support IEnumerable<T> or a
derived interface such as the generic
IQueryable<T> are called queryable types
The Query
• The query specifies what information to
retrieve from the data source or sources
• Query also specifies how that information
should be sorted, grouped, and shaped
before it is returned
• The query expression contains three
clauses: from, where and select
Deferred execution
• query variable itself only stores the query
commands
• The actual execution of the query is deferred
until you iterate over the query variable in
a foreach statement
Forcing Immediate Execution
• Examples of such queries
are Count, Max, Average, and First. These
execute without an explicit foreach statement
because the query itself must use foreach in
order to return a result.
• That these types of queries return a single value,
not an IEnumerable collection.
• ToList<T>, ToArray<T>
LINQ vs SQL
SELECT UPPER(Name)
FROM Customer
WHERE Name LIKE 'A%'
ORDER BY Name
LINQ vs SQL
SELECT UPPER(Name) FROM
(
SELECT *, RN = row_number()
OVER (ORDER BY Name)
FROM Customer
WHERE Name LIKE 'A%'
) A
WHERE RN BETWEEN 21 AND 30
ORDER BY Name
LINQ vs SQL
var query =
from c in db.Customers
where c.Name.StartsWith ("A")
orderby c.Name
select c.Name.ToUpper();
var thirdPage = query.Skip(20).Take(10);
LINQ vs SQL
from p in db.Purchases
where p.Customer.Address.State == "WA" ||
p.Customer == null
where p.PurchaseItems.Sum (pi =>
pi.SaleAmount) > 1000
select p
LINQ vs SQL
SELECT p.*
FROM Purchase p
LEFT OUTER JOIN
Customer c INNER JOIN Address a ON c.AddressID = a.ID
ON p.CustomerID = c.ID
WHERE
(a.State = 'WA' || p.CustomerID IS NULL)
AND p.ID in
(
SELECT PurchaseID FROM PurchaseItem
GROUP BY PurchaseID HAVING SUM (SaleAmount) > 1000
)
When not to use LINQ for querying databases
• Hand-tweaked queries (especially with
optimization or locking hints)
• Queries that involve selecting into temporary
tables, then querying those tables
Query syntax vs Method syntax
• IEnumerable<int>
numQuery1 =
• from num in
numbers
• where num %
2 == 0
• orderby num
• select num;
• IEnumerable<int>
numQuery2 =
numbers.Where(num =>
num % 2 ==
0).OrderBy(n => n);
Demo
Q & A
?
What’s next?
• 6.12. – Programiranje i testiranje softverskog
proizvoda, Denis Sušac (Mono)
– Radionica: Odabir tehnologija
• 10.12. – WCF servisi, REST servisi, Načini
povezivanja i komunikacije klijenta i servisa, Leo Tot
(MSP)
Thank you!
ivan.markovic@studentpartner.com

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EF+LINQ Demo for Accessing and Querying Data

  • 1. Ivan Marković MSP Lead Software Developer at SPAN d.o.o. ivan.markovic@studentpartner.com
  • 2. Vidjeli smo… • Tipovi aplikacija • Metode razvoja softverskog proizvoda+ALM u Microsoft alatima • C# • Baze podataka
  • 3. Agenda 1) Entity Framework 2) LINQ 3) EF+LINQ Demo(s)
  • 5. What is Entity Framework? • Entity framework is an Object/Relational Mapping (O/RM) framework • Automated mechanism for accessing & storing the data in the database
  • 6. What is ORM? • ORM is a tool for storing data from domain objects to relational database (like MS SQL Server) • O/RM includes three main parts: Domain class objects, Relational database objects and Mapping information
  • 7. Why ORM? • ORM allows us to keep our database design separate from our domain class design • This makes the application maintainable and extendable
  • 8. ORM vs Traditional Data Access Techniques • ORM often reduces the amount of code that needs to be written • High level of abstraction obscuring what is actually happening in the implementation code
  • 10. SQL Relationships • One-to-Many Relationship • Many-to-Many Relationship • One-to-One Relationship
  • 11. EF 6 Tools for VS 2012 & 2013 • http://www.microsoft.com/en- us/download/confirmation.aspx?id=40762
  • 12. Database first • An existing database can be used • Code can be auto-generated. • Extensible using partial classes/ T4 templates • The developer can update the database manually • There is a very good designer, which sync with the underlining database
  • 13. Code first • There is full control of the model from the Code; no EDMX/designer • No manual intervention to DB is required • The database is used for data only • POCO Class
  • 14. Model first • Good support with EDMX designer • We can visually create the database model • EF generates the Code and database script • Extensible through partial classes • We can modify the model and update the generated database.
  • 15. Code first from existing database • POCO Classes from existing database
  • 16. Which one to choose? • It depends on you…
  • 17. LINQ
  • 18. • Language-Integrated Query (LINQ) • Set of features that extends powerful query capabilities to the language syntax of C# and Visual Basic. LINQ
  • 19. Three parts • All LINQ query operations consist of three distinct actions: – Obtain the data source. – Create the query. – Execute the query.
  • 20. Three parts • // 1. Data source. • int[] numbers = new int[7] { 0, 1, 2, 3, 4, 5, 6 }; • // 2. Query creation. • // numQuery is an IEnumerable<int> • var numQuery = • from num in numbers • where (num % 2) == 0 • select num; • // 3. Query execution. • foreach (int num in numQuery) • { • Console.Write("{0,1} ", num); • }
  • 21. The Data Source • Types that support IEnumerable<T> or a derived interface such as the generic IQueryable<T> are called queryable types
  • 22. The Query • The query specifies what information to retrieve from the data source or sources • Query also specifies how that information should be sorted, grouped, and shaped before it is returned • The query expression contains three clauses: from, where and select
  • 23. Deferred execution • query variable itself only stores the query commands • The actual execution of the query is deferred until you iterate over the query variable in a foreach statement
  • 24. Forcing Immediate Execution • Examples of such queries are Count, Max, Average, and First. These execute without an explicit foreach statement because the query itself must use foreach in order to return a result. • That these types of queries return a single value, not an IEnumerable collection. • ToList<T>, ToArray<T>
  • 25. LINQ vs SQL SELECT UPPER(Name) FROM Customer WHERE Name LIKE 'A%' ORDER BY Name
  • 26. LINQ vs SQL SELECT UPPER(Name) FROM ( SELECT *, RN = row_number() OVER (ORDER BY Name) FROM Customer WHERE Name LIKE 'A%' ) A WHERE RN BETWEEN 21 AND 30 ORDER BY Name
  • 27. LINQ vs SQL var query = from c in db.Customers where c.Name.StartsWith ("A") orderby c.Name select c.Name.ToUpper(); var thirdPage = query.Skip(20).Take(10);
  • 28. LINQ vs SQL from p in db.Purchases where p.Customer.Address.State == "WA" || p.Customer == null where p.PurchaseItems.Sum (pi => pi.SaleAmount) > 1000 select p
  • 29. LINQ vs SQL SELECT p.* FROM Purchase p LEFT OUTER JOIN Customer c INNER JOIN Address a ON c.AddressID = a.ID ON p.CustomerID = c.ID WHERE (a.State = 'WA' || p.CustomerID IS NULL) AND p.ID in ( SELECT PurchaseID FROM PurchaseItem GROUP BY PurchaseID HAVING SUM (SaleAmount) > 1000 )
  • 30. When not to use LINQ for querying databases • Hand-tweaked queries (especially with optimization or locking hints) • Queries that involve selecting into temporary tables, then querying those tables
  • 31. Query syntax vs Method syntax • IEnumerable<int> numQuery1 = • from num in numbers • where num % 2 == 0 • orderby num • select num; • IEnumerable<int> numQuery2 = numbers.Where(num => num % 2 == 0).OrderBy(n => n);
  • 32. Demo
  • 34. What’s next? • 6.12. – Programiranje i testiranje softverskog proizvoda, Denis Sušac (Mono) – Radionica: Odabir tehnologija • 10.12. – WCF servisi, REST servisi, Načini povezivanja i komunikacije klijenta i servisa, Leo Tot (MSP)

Editor's Notes

  1. EDM (Entity Data Model): EDM consist three main parts- Conceptual model, Mapping and Storage model. Conceptual Model: The conceptual model contains the model classes and their relationships. This will be independent from your database table design. Storage Model: Storage model is the database design model which includes tables, views, stored procedures and their relationships and keys. Mapping: Mapping consist information about how the conceptual model is mapped to storage model. LINQ to Entities:LINQ to Entities is a query language used to write queries against the object model. It returns entities, which are defined in the conceptual model. You can use your LINQ skills here. Entity SQL: Entity SQL is another query language just like LINQ to Entities. However, it is a little more difficult than L2E and also the developer will need to learn it separately. Object Service:Object service is a main entry point for accessing data from the database and to return it back. Object service is responsible for materialization, which is process of converting data returned from entity client data provider (next layer) to an entity object structure. Entity Client Data Provider:The main responsibility of this layer is to convert L2E or Entity SQL queries into a SQL query which is understood by the underlying database. It communicates with the ADO.Net data provider which in turn sends or retrieves data from database. ADO.Net Data Provider:This layer communicates with database using standard ADO.Net.
  2. Student – ima jednu adresu One to many – profesor i knjiga Many to many – student kolegij