USING LINQ TO QUERY DATA

LINQ to SQL
LINQ to SQL is part of ADO.NET which provides a run-time infrastructure for mapping relational data as objects. In essence, it is an ORM (object-relational mapping) framework that enables the direct 1-to-1 mapping of a SQL Server database and i[r]

In the case of IQueryable<T> , vigilance regarding deferred execution is even more critical. Imagine, for example, a LINQ provider that returns data from a database. Rather than retrieve the data from a database regard- less of the selection criteria, the[r]

MyDatabaseDataContext db = new MyDatabaseDataContext();
var query = db.Movies.Select( m => new {Id = m.Id, MovieTitle = m.Title} );
Selecting Particular Rows
If you want to select only particular rows from a database table and not all the rows, you can take advantage of the[r]

Introducing LINQ
Software is simple. It boils down to two things: code and data. Writing software is not so simple, and one of the major activities it involves is programming code to deal with data.
To write code, we can choose from a variety of progr[r]

INTRODUCTION TO LINQ HOANG ANH VIET VietHa@it-hut.edu.vn TRANG 2 OBJECTIVES TRANG 3 ROADMAP 15.1 UNDERSTANDING THE ROLE OF LINQ 15.2 A FIRST LOOK AT LINQ QUERY EXPRESSIONS 15.3 LINQ AND [r]

A D V A N C E D T O P I C Origin of Iterators
In 1972, Barbara Liskov and a team of scientists at MIT began researching programming methodologies, focusing on user-defined data abstractions. To prove much of their work, they created a language called CLU that had a concept calle[r]

A D V A N C E D T O P I C Origin of Iterators
In 1972, Barbara Liskov and a team of scientists at MIT began researching programming methodologies, focusing on user-defined data abstractions. To prove much of their work, they created a language called CLU that had a concept calle[r]

Using LINQ to SQL, especially when building models with its visual designer, is straightforward and often much quicker than setting up a LINQ to Entities environment. Microsoft’s official encouragement to use the Entity Framework option may help guide you[r]

(Microsoft Press, 2008) offer both complete introductions and comprehensive information on T-SQL and SQL Server.
Organization of This Book
This book is divided into five sections, each of which focuses on a different aspect or technol- ogy within the ADO.NET family. Part I, “Getting to K[r]

TRANG 1 TRANG 2 OBJECTIVES TRANG 3 ROADMAP 15.1 UNDERSTANDING THE ROLE OF LINQ 15.2 A FIRST LOOK AT LINQ QUERY EXPRESSIONS 15.3 LINQ AND GENERIC COLLECTIONS 15.4 LINQ AND NONGENERIC COLL[r]

sequence. Notable examples of sequences are both the generic List class and the standard
Array class. (So anything you can dump into an array, you can query with LINQ.) The C# language supports the following clauses that you can use in a query:
. from —Enables you to<[r]

You can embed a MERGE statement inside the Execute SQL task to use it in your SSIS package. Typically, you would stage data to a staging table to change capture before loading it in the data warehouse with an Integration Services package. Such an SSIS package w[r]

Press Enter/Return to continue:
Clearly, this is a more generally useful query. By querying a list of elements of a known type, you can then search for specific attributes, which you will look at next.
For completeness sake, you should know that LINQ to XML also prov[r]

The page in Listing 20.13 demonstrates how you can use the MyDatabaseContext class when performing a LINQ to SQL query after dragging the Movies database table onto the LINQ to SQL Desig[r]

Note that the AsUnordered() operator can be used to tell PLINQ that you no longer care about ordering items.
ForAll Operator()
Iterating through the results of a LINQ query requires that all the output be merged together. If results ordering is not important, you should[r]

Code Behind for the LinqDataSource Control
We want to alter the behavior of the LinqDataSource control so that it only shows the records for this particular instance of the module. In addition, when inserting a record we want to insert the current ModuleId and the current Use[r]

FULL CODE ĐỂ THAM KHẢO using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; TRANG 9[r]

C. The Command object accCommand is initialized by using three properties: Connection object, Command type, and Command string.

D. Note that there are two dynamic parameters, @Param1 and @Param2, in the query string, and these two parameters need to be replac[r]

When it comes to developer skills, this also means that those who have programmed using .NET before have the capability to quickly translate those skills into real development. This means lever- aging C# or VB.NET, LINQ, WCF, and so on. However, Silverlight is not limit[r]

Note The DataAdapter object’s Fill method loads all requested data into local DataSet memory. If the tables you need to query with LINQ are large and you aren’t able to first reduce the num- ber of ADO.NET-managed rows, you might wish to consider alt[r]