linq shows

LINQ: getting started with LINQ (1)-Introduction to LINQ query and linq QueryGetting started with LINQ (1)-Introduction to LINQ Query A query is an expression used to retrieve data from a data source. Over time, people have develo

connections cannot elevate system transactions when used against SQL Server server. The way it takes is. Only if it finds out that a transaction scope is used, it will voluntarily register itself with the full distributed transaction.Use the following example to illustrate the use of transactions. Over here. It also shows the reuse of the same connection between the ADO and DataContext.varQ = fromPinchDb. ProductswhereP.productid = = 3SelectP//using

LINQ: start to use LINQ (2)-Basic LINQ query operations, linq QueryGetting started with LINQ (2)-Basic LINQ query operations The first step is to specify the data source. Like in most programming languages, variables must be decla

LINQ: start to use LINQ (3)-use LINQ for data conversion, and use linq for Data ConversionGetting started with LINQ (3)-using LINQ for Data Conversion Language integration query (LINQ)

interact with our database model. in the sample above I added a single "getproductsbycategory" sproc. it takes a categoryid as an input argument, and returns a sequence of product entities as a result. we'll look at how to call this sproc in a code sample below. The right side of the LINQ to SQL designer is the stored procedure that interacts with our database model. In the above example, I added a "getproductsbycategory" stored procedure. It has a c

LINQ is a new thing, but from many articles and discussions, this concept is a bit chaotic. Therefore, we often see the following: Only data tables and object attributes can be matched one by one in LINQ ...... LINQ Development Guide: map database fields in LINQ ...... In fact, the above two statements refer to the

LINQ is a new thing, but from many articles and discussions, the concept is a bit confusing. So we can often see this: LINQ can only match data tables to entity attribute one by one ... LINQ Development Guide: Database field mapping in LINQ ... In fact, the above two sentences are all

LINQ: starts to use LINQ (4)-LINQ to query the type relation of the operation.Start to use LINQ (4)-the type Relationship of the LINQ query operation. The data source, query itself, and query execution are strongly-typed. The types of variables in the query must be the same

in the order table is not required to be filled in, the remaining fields are not mentioned here }}}; // submit the object data to save and execute the update myTestDB. MERs. addObject (myCust );}View Code 4. Table update:// Replace the inserted customer name [no sub-accounts] with [hahaha] public void updateData () {// instantiate the database object ObjectContext NorthwindEntities myTestDB = new NorthwindEntities (); customer data = (from customer in myTestDB. MERs where customer. customerID

Introduction to Query expressions (LINQ) In the last two articles, I introduced the features and improvements of C #3.0 new language.ProgramIt provides us with great help. From the beginning of this article, we will start to discuss the LINQ. LINQ is short for Language Integrated Query, which is integrated in. net.Programming Language. It has become an integra

Linq learning summary 1-refer to the detailed description of Linq technology, 1-linqKey points:1. The set of linq operations must implement the IEnumerable interface. Therefore, before 3.0, the set that implements this interface must be converted to a Linq-enabled set through the Cast or TypeOf method; 2. the query exp

Linq learning summary 1-refer to the detailed description of Linq technology, 1-linq Two key points: 1. The set of linq operations must implement the IEnumerable interface. Therefore, before 3.0, the set that implements this interface must be converted to a Linq-enabled set

A more concise version will be published in the blog Hall (excluding the English version). I hope this article will help you! Allowed to reprint, trouble to indicate the source: http://www.cnblogs.com/hanxianlongOriginal article:Http://weblogs.asp.net/scottgu/archive/2007/05/29/linq-to-sql-part-2-defining-our-data-model-classes.aspx In Part 1 of my LINQ to SQL blog post series I discussed "What Is

LINQ to datasets require the use of System.Core.dll, System.Data.dll and System.Data.DataSetExtensions.dll, add references System.Data and System.Data.DataSetExtensions to the project.1. DataTable Read ListDataSet ds = new DataSet ();//Omit the DS's fill code datatable products = ds. tables["Product"];ienumerableDataSet ds = new DataSet ();//Omit the DS's fill code datatable products = ds. tables["Product"];var rows = products. AsEnumerable () . Se

db.Products where p.UnitsInStock Statement Description: In this example, the direct key expression of the query and key expression is directly calculated as a Dictionary ADO. NET and LINQ to SQL LINQ to SQL is based on the services provided by the ADO. NET provider program model. Therefore, we can mix the LINQ to SQL code with the existing ADO. NET applicati

", new XAttribute("Type", "Home")), new XElement("phone", "425-555-0145", new XAttribute("Type", "Work")), new XElement("Address", new XElement("Street1", "123 Main St"), new XElement("City", "Mercer Island"), new XElement("State", "WA"), new XElement("Postal", "68042") ) ) ); Note that the code used to construct the XML tree