convert sql to linq

I have received an article from infoq.ArticleThink of a comment that caused debate a few days ago, so I reprinted the original article and translated it as follows. The level is limited. Please correct haihan for an error. Original article: http://www.infoq.com/news/2008/11/DLINQ-Future Is LINQ to SQL truly dead? PostedJonathan AllenOn Nov 01,200 8 AM Back in July we reported that

First of all, the three are completely three different things, SQL is Structured Query Language (structured query Language) abbreviation, this is familiar to everyone, the following is mainly about the basic concepts of LINQ and lambda expressions and the same query the different implementations of the three. Simple Introduction LINQ (Language integrate query) is

PDF browse: http://files.cnblogs.com/JimmyZhang/Linq-To-Sql-Part_2-Define-Data-Model-Class.pdf Source:LINQ to SQL (Part.2-defining our model classes)Glossary Data Model: Data ModelDesigner: designerClass Library: Class LibraryClient project: client projectPipelineEntity class: entity classInstance: instancePartial class: Partial ClassificationRuntime: RuntimeExe

objects, or database objects that cannot be used in the program (such as log tables and batch operation tables ), it is completely unnecessary to make these objects consume memory space and the datacontext Object Tracking Service.We recommend that you distribute all database objects to several datacontext instances based on the unit of work. You can also configure the datacontext using the same database connection through the constructor, which can also be used by the database connection pool.

The previous article described LINQ, and by the way, the where operation, this begins with the LINQ to SQL statement, which allows you to understand from a statement's perspective that Linq,linq includes LINQ to Objects,

Both LINQ and LINQ to SQL are no longer a new thing, but I was too late to come into contact with this series. I decided to write this series with an attitude that I knew it was necessary. The test environment used in this article is vs 2010, and the SQL Server 2005 database. 1. Starting from cud, how to inse

The examples in this article describe the use of ASP.net with LINQ to SQL connection databases and SQL action statement usage. Share to everyone for your reference, specific as follows: Introduction to LINQ LINQ: Language integrated queries (Language Integrated query) is a

As developers take on more and more security responsibilities, the first Web Application Security vulnerability that many developers know is an extremely dangerous form of Command Injection called "SQL injection. The original form of command injection refers to a vulnerability in which an attacker can change your web application by providing an unexpected input from a normal user.ProgramAllows attackers to run unauthorized commands on the server. Undo

());Console. writeline ("message: {0}", ex2.message );}}} 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 ". After reading ASP. NET transactions, see implicit transaction processing in LINQ to SQL. 3rd. Implicit Transaction Processing in

Tags: blog http using io strong ar amp LogSeries Article Navigation:Where is the LINQ to SQL statement (1)Select/distinct of LINQ to SQL statements (2)Count/sum/min/max/avg of LINQ to SQL statements (3)Join of

Document directory What is a model class? Create a Movie Database Create a LINQ to SQL class Use LINQ to SQL in controller operations Use repository Mode Summary In this tutorial, we will build a basic movie database application. First, we will create a movie database application as soon as possible. We will

elements in the second collection that do not appear in the preceding collection of elements. Q = ( db. Customers c.country ). Except ( db. Employees e.country ); Statement Description: Query the customer and staff of different countries. Series Article Navigation:Where is the LINQ to SQL statement (1) Select/distinct of

Once an object is loaded into the memory, it is very easy to insert a new order. It is nothing more than creating an order class instance and adding it to the orders set of the customer object. LINQ-to-SQL will track changes in the data context and send those changes back to the database when the submitchanges of the data context object is called. The following example shows a data change process: String i

Both LINQ to SQL and the Entity Framework are object-relational mapping techniques that contain LINQ functionality. The essential difference between them is that EF does a better job of decoupling the database schema from the type of our query. With EF, the object we're querying is no longer a C # class that exactly corresponds to the database schema, but rather

[Linq To SQL] solves Collation conflicts during join operations. Background Now two tables A: B: If you try the join operation, an error is returned: Analysis Because the sorting rules of the two table fields are different, the table cannot be compared during connection, and an exception is thrown. If you use an SQL statement, you only need to specify Colla

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. NET users often cannot figure out which one should be selected between LINQ