Over the last few weeks I've been writing a series of blog posts that cover LINQ to SQL. LINQ to SQL is a built-in O/RM (object relational mapper) that ships in the .NET Framework 3.5 release, and which enables you to easily model relational databases using .NET classes. You can us...
specific issues, and you can participate in theLINQ Forum, where you can discuss more complex topics in detail with experts. Finally, theLINQ to SQL: .NET Language-Integrated Query for Relational Datawhite paper details LINQ to SQL technology, complete with Visual Basic and C# code examples. ...
LINQ to SQL Code Examples Once we've modeled our database using the LINQ to SQL designer, we can then easily write code to work against it. Below are a few code examples that show off common data tasks: 1) Query Products From the Database The code below uses LINQ query syntax to ret...
Finally, the LINQ to SQL: .NET Language-Integrated Query for Relational Data white paper details LINQ to SQL technology, complete with Visual Basic and C# code examples. In This Section Getting Started Provides a condensed overview of LINQ to SQL along with information about how to get started...
First let's open up the generated LINQ to SQL classes by opening the .Designer.vb file under the dbml file (if you don't see the designer file, just click the "show all files" button on the Solution Explorer tool strip first). If we take a look at our Order class we will see ...
The following example usesDistinctto select a sequence of the unique cities that have customers. VB DimcityQuery = _ (FromcustIndb.Customers _Selectcust.City).Distinct()ForEachcityStringIncityQuery Console.WriteLine(cityString)Next See Also ...
SqlClient 資料流支援 LINQ to DataSet LINQ to DataSet 開始使用 程式設計手冊 程式設計手冊 LINQ to DataSet 中的查詢 查詢DataSet 比較DataRow 從查詢建立 DataTable 作法:實作 CopyToDataTable<T>,其中泛型型別 T 不是 DataRow 泛型Field 和 SetField 方法 資料繫結和 LINQ to DataSet 偵錯L...
The query operators over XML (LINQ to XML) use an efficient, easy-to-use, in-memory XML facility to provide XPath/XQuery functionality in the host programming language. The query operators over relational data (LINQ to SQL) build on the integration of SQL-based schema definitions into the ...
Instead, this chapter introduces you to LINQ to SQL (LTS) through simple examples that highlight the features of ORM. To keep this chapter concise and focused on LTS, the Bottom Up approach is used because it is natively the most supported technique in LTS. Alternatively, when you map the...
I'll also show you the code and explain the LINQ techniques used, and then I'll explain how you can modify and extend my examples in order to meet your own needs. The System under Test Before digging into the harness, let's look at the sample database of the system under test so ...