linq or ado net

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.

System.Core.dll, the LINQ to DataSet adds a number of dataset-specific extensions that make it easier to query a set of DataRow objects. These DataSet extensions include operators for comparing row sequences and methods for accessing the column values of a DataRow.2. LINQ to SQLLINQ to SQL is suitable for development that does not require mapping to a conceptual model, and by using

operation. 17 18 Interop_db.transaction = Nwindtxn; // Add a transaction to datacontext 19 20 Product prod1 = Interop_db.products 21 . First (P => P. productid = 4 ); 22 Product prod2 = Interop_db.products 23 . First (P => P. productid = 5 ); 24 Prod1.unitsinstock -= 3 ; 25 Prod2.unitsinstock -= 5 ; 26 27 Interop_db.submitchanges (); // perform the operation 28 29 Nwindtxn. Commit ();

Original article: http://ramanisandeep.wordpress.com/2010/12/09/linq-to-sql-vs-ado-net-entity-framework/ The choice between LINQ to SQL and ADO. NET Entity Framework I believe that many new ASP.

1. When selecting datasource in my environment vs2008 sp1.entity Data Model Wizard, the Acess database cannot be selected. Is the acess Entity Data Model currently unavailable. On the contrary, you can use LINQ to SQL. 2. What are the advantages of ADO. NET Entity compared with LINQ to SQL? for small and medium pro

Tags: ado LINQ to SQL SqlBulkCopy mass data insert performance testSummary: Use. NET-related technology to insert large amounts of data into a database is a common operation. This article compares the two Technologies of ADO and LINQ, using the SqlBulkCopy () andinsertallons

try-- If an exception occurs, enter the catch code segment.Begin catchRollback transaction -- roll back the transactionSelect error_message () as [Message] -- output error messageEnd catch The preceding Code fails after execution. The error message is: "The unique key constraint 'uq _ users_username' is violated '. Duplicate keys cannot be inserted in the object 'dbo. users ". Note that in SQL Server, if the transaction is not explicitly declared, the system will allocate a recessive transac

"); // = true; Of course, if you use different Context instance queries, the cache function will be effective. Well, let's take a look at ADO. NET Entity Framework beta 3:// PubsEntites is the System. Data. Objects. ObjectContext derived object of ADO. NET Entity Framework. PubsEntities context = new pubsEntities ();

= q.todictionary (p = p.productid);foreach(intKeyinchQdictionary.keys) {Console. WriteLine (key);}Statement Description: This sample uses todictionary to directly evaluate the query and key expression direct key expressions as dictionaryAdo. NET and LINQ to SQLLINQ to SQL is based on the services provided by the ADO provider model. As a result, we were able to m

standard iteration methods. Entity Framework and LINQ are two new tools established by Microsoft to improve the core functions of ADO. net. Note that theyIt is not a basic component of ADO. net.. The Entity Framework converts each database object to an application object

By repeatedly executing the INSERT command into the database, compare the performance of accessing SQL Server by ADO. Net ole db provider, ADO. Net SQL provider and ADO. Net ODBC provider. { Function onclick () { Function onclick

natural integrated query framework. All of these features are language enhancements for LINQ, and designers are constantly exploring new language features that are more consistent with modern development systems, as well as increasing support for functional programming features such as the introduction of the DLR to Python, Ruby's functional scripting language, There will be more and more support for other functional scripting languages later. Be

capabilities more importantly (the so-called design capabilities reflect the technical level ). An object model is simply a design model of an object. How to construct a deep object structure that meets the needs. The design of the concept layer in the architecture system of the mainstream ORM framework ADO. NET EntityFramework on the. NET platform reflects the

with a standard iterative approach.The Entity Framework and LINQ are the two new tools Microsoft has built to improve the core functionality of ADO. It is important to note that they are not an essential part of ADO .The Entity Framework takes advantage of the abstraction of data structures to convert each database object into an Application object (entity), and

with a standard iterative approach.The Entity Framework and LINQ are the two new tools Microsoft has built to improve the core functionality of ADO. It is important to note that they are not an essential part of ADO .The Entity Framework takes advantage of the abstraction of data structures to convert each database object into an Application object (entity), and

About ADO. NET and ADO. NETWhat is ADO. NET? Although we all know that ADO. NET is a database operation, it is not easy to tell the specific meaning of

Abstract:This article discusses how to use ADO. Net to perform basic database operations and when to use ADO. net instead of ADO. Directory . NET data accessRead dataDataset, datatable, and recordsetConvert existing codeUpdate Da

In recent years, as the preferred method for data access in Windows-based applications, ADO plays an important role. A large number of ADO applications are currently in use, and a large number of developers are familiar with ADO development. With the emergence of. NET Framework, AD