Dev-In-Town:Linq To Sql by Chan Ming Man
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The document discusses LINQ (Language Integrated Query) which allows querying and manipulating data directly in .NET code. It covers what LINQ is, the LINQ architecture, and how LINQ supports CRUD (Create, Read, Update, Delete) operations. Specifically, it provides examples of using LINQ to SQL to perform each of the CRUD operations and maps them to the equivalent SQL queries.
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![DeleteLINQvaroldDetail = db.Order_Details.Single(od => od.OrderID == 10422&& od.ProductID == 26);db.Order_Details.DeleteOnSubmit(oldDetail);SQLDELETE FROM [dbo].[Order Details]WHERE [OrderID] = 10422 AND [ProductID] = 26 AND ...](https://image.slidesharecdn.com/linqtosql-090629035715-phpapp01/85/Dev-In-Town-Linq-To-Sql-by-Chan-Ming-Man-18-320.jpg)
Dev-In-Town:Linq To Sql by Chan Ming Man
- 1. devInTownChan Ming ManC# MVPhttp://chanmingman.spaces.live.comLevel 200
- 2. devInTownCRUD Using LINQ (Language Integrated Query)Chan Ming ManC# MVPhttp://chanmingman.spaces.live.comLevel 200
- 3. AgendaThe object model challenges the relational modelWhat is LINQ?LINQ to SQL
- 4. Helpful ExperienceVisual Studio 2008 C# ExpressSQL Server 2005 ADO.NET
- 5. The object model challenges the relational modelThe relational model has been fantastically successful in a wide variety of application areas. However, it is not problem free. The problems have been made more visible by the rise in popularity of object-oriented programming languages such as C++, Java, and C#.
- 6. Data…its our jobQuerying and manipulating data has always been a fundamental part of our jobs as programmersData formats change, but core needs are the same
- 7. Data Access(DBASE circa 1980s)USE empl REPLACE ALL salary WITH (salary * 1.1) FOR supervises > 0 LIST ALL fname, lname, salary FOR Supervises > 0Data querying and manipulation a core part of the programming model experienceCertainly had limitations, but it sure was useful
- 8. But Challenges Still Remain…How to retrieve non-relational data?XML, RSS, Web Services, REST, AD, Files, etc.How to interact with plain old objects?How do you interact and query custom domain models?How to enable rich data shaping & transformations?Support flexible query composition (that is fast!)How to enable clean code in both a strongly typed and dynamic language world?
- 9. LINQQuery, Set, and Transform Operations for .NETMakes querying data a core programming concept Works with all types and shapes of dataRelational databasesXMLPlain old ObjectsWorks with all .NET languagesNew VB and C# have integrated language support
- 10. Queries integrated with code (C#/VB)What is LINQ?Strongly-typedBenefits from IntelliSenseCollections of objectsRelational dataXMLUnified QueryingLanguage INtegrated Queries
- 11. LINQ ArchitectureC# 3.0VB 9.0Others….NET Language-Integrated Query (LINQ)LINQ Enabled Data SourcesLINQ enabled ADO.NETLINQ to EntitiesLINQ ToSQLLINQ toXMLLINQ ToDatasetLINQ ToObjectsXMLObjectsRelational Data11©2008 Pavel Yosifovich
- 12. Where is LINQ to SQL in MVC?ModelLINQ ToSQLControllerView
- 13. LINQ to SQLApplicationfrom c in db.Customerswhere c.City == "London"select c.CompanyNamedb.Customers.Add(c1);c2.City = “Seattle";db.Customers.Remove(c3);LINQ QueryObjectsSubmitChanges()LINQ to SQLSQL QueryRowsDML or Stored ProceduresSELECT CompanyNameFROM CustWHERE City = 'London'INSERT INTO Customers…UPDATE Customers …DELETE FROM Customers …SQL Server
- 14. LINQ to SQL fully support CRUDC = Create = InsertR = Read = SelectU = UpdateD = Delete
- 15. CreateLINQvarnewCustomer = new Customer {CustomerID = "DLEAP",CompanyName = "DevLeap",Country = "Italy" };db.Customers.InsertOnSubmit(newCustomer);SQLINSERT INTO [Customers](CustomerID, CompanyName, ...)VALUES("DLEAP", "DevLeap", ...)
- 16. ReadLINQvar query =from c in Customerswhere c.Country == "USA"&& c.State == "WA"select new {c.CustomerID, c.CompanyName, c.City };SQLSELECT CustomerID, CompanyName, CityFROM CustomersWHERE Country = 'USA'AND Region = 'WA'
- 17. UpdateLINQCustomer cust = db.Customers.Single(p => p.CustomerID == 11111);cust.LastName = “Thomas ";db.SubmitChanges();SQLUPDATE Customer LastName = “Thomas "SET WHERE CustomerID == 11111
- 18. DeleteLINQvaroldDetail = db.Order_Details.Single(od => od.OrderID == 10422&& od.ProductID == 26);db.Order_Details.DeleteOnSubmit(oldDetail);SQLDELETE FROM [dbo].[Order Details]WHERE [OrderID] = 10422 AND [ProductID] = 26 AND ...
- 19. Demo …
- 20. Resources - LINQMSDN Developer Centerhttp://msdn2.microsoft.com/en-us/netframework/aa904594.aspxLINQ Forumhttp://forums.microsoft.com/msdn/showforum.aspx?forumid=123Channel9 Linq Videoshttp://channel9.msdn.com/tags/linqBlogsScott Guthrie http://weblogs.asp.net/scottgu/archive/2007/04/21/new-orcas-language-feature-query-syntax.aspxCharlie Calvert http://blogs.msdn.com/charlie/archive/2006/10/05/Links-to-LINQ.aspxLINQ HOLC# 3.0 Enhancements & LINQ (English)
- 21. © 2008 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista 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.