convert sql to linq

be negative interop_db.SubmitChanges (); nwindTxn. commit ();} catch (Exception e) {// if there is an error, all operations roll back the Console. writeLine (e. message);} nwindConn. close (); Statement Description: This example uses an existing ADO. NET connection to create a Northwind object, and then shares an ADO. NET transaction with this object. This transaction is used to execute SQL commands through the ADO. NET connection and submit changes

During this time, writing of LINQ and SQL is missing! Or are you getting old? More and more will not change Problem: ========================================================== ======== VaR ret = from X in LSWhere (String. isnullorempty (Arg. querytext )? True:((X. ?? ""). Toupper (). Contains (Arg. querytext. toupper ())| (X. B ?? ""). Toupper (). Contains (Arg. querytext. toupper ())| (X. c ?? ""). Toupper

In one sentence, convert a Linq statement to an SQL statement.Zookeeper Public IEnumerable {IEnumerable IQueryable MerchantList = Report_List (); # Region obtain the VMB_Report set from MerchantList ResultModel = merchantList. Select (o => new VMB_Report{ MerchantID = o. MerchantID,MID = o. MID,DBA = o. DBA,DBAPhone = o. DBAPhone,ContactName = o. ContactName,Tota

easy way to integrate data validation and business logic rules into your data model. LINQ to SQL fully supports transactions, views, and stored procedures. It also provides a convenient way to verify the set data and business logic rules in your data model. Modeling databases using LINQ to SQL: Create a database by us

= = 5); Prod1. UnitsInStock-= 3; ProD2. UnitsInStock-= 5;//This has an error and cannot be negativeinterop_db. SubmitChanges (); Nwindtxn.commit ();}Catch(ExceptionE) {//Suppose there is an error. Rollback of all operationsConsole. WriteLine (e.message);} Nwindconn.close ();Statement Description: This sample creates a Northwind object using a pre-existing ADO connection and then shares an ADO transaction with this object. This transaction is used both to run

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

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

Label:Http://www.cnblogs.com/yukaizhao/archive/2010/05/13/linq_to_sql_1.htmlLINQ and LINQ to SQL are no longer a new thing, but I am in touch with the relatively late, in the spirit of knowing this matter to preach attitude, decided to write this series.The test environment that this article uses is vs 2010, and the SQL Server 2005 database.1. Starting with cud,

()){db.Log = Console.Out;db.Students.InsertOnSubmit(aStudent);db.SubmitChanges();}Console.WriteLine("----------End Add a student");} SQL statements for output 1234567 insert into [dbo].[ Student] ([ name ], [hometown]) values (@p0, @p1) select convert ( int ,scope_identity ()) as [value] --@ P0:input NVarChar (Size = 4000; Prec = 0; Scale = 0) [Zhang Xiao ii] --@p

LINQ to objects, LINQ to datasets, LINQ to SQL, LINQ to entities, and LINQ to XML. A. Net Language Integrated Query Based on relational data. It is used to manage relational data in the form of objects and provides rich query f

Label:DataContextDataContext, as the main entry point for the LINQ to SQL framework, provides us with methods and properties that illustrate several typical applications of DataContext in several examples.Creating and Deleting databasesThe CreateDatabase method is used to create a database on the server.The DeleteDatabase method is used to delete the database identified by the DataContext connection string.

LINQ to SQL Provides a run-time infrastructure for managing relational data as objects. In LINQ to SQL, the data model of a relational database was mapped to an object model expressed in the programming language of the developer. When you execute the application, LINQ to

Http://u.115.com/file/f2f877c8d1 demo LINQ to SQL supports all the key functions that SQL developers expect. You can query information in a table, insert information in the table, and update and delete information in the table. SelectYou can select (Project) by writing a LINQ query in your own programming language and

linqproductdatacontext class inherits from system. Data. LINQ. datacontext. The datacontext class represents the main entry point of the LINQ to SQL framework and provides a series of database operation methods. (2) convert the poruduct table in the database to the seal class poruduct, and

1. Case when ... Then ...var from inch context. Products Selectnew { = P.productid, = p. ProductName, 0" Yes " " no " };SELECT [Extent1].[ProductID] as [ProductID], [Extent1].[ProductName] as [ProductName], Case when([Extent1].[UnitsInStock] > 0) ThenN'is a' ELSEN'No' END as [C1] from [dbo].[Product] as [Extent1]LINQ series:

In this article, we'll go on to the previous article, "LINQ to SQL and Entity Framework (top)", and continue to use LINQ to SQL and the Entity Framework to practice "Interpreting queries" to learn the key features of these technologies. We are here to focus on the "LINQ" sec

Comparison of the Performance of a Group using the LinQ to SQL and non-LinQ methods. A data table with 476550 data records. Group A field and sort it by the field. This requirement is implemented by using the methods of LinQ to SQL and non-

An error occurred while using LINQ to Entities today to facilitate the description of creating a demo table for restoring problems: CREATE TABLE Person(Id int Identity (1,1) primary key,Name nvarchar is not NULL,Age int NOT NULL)INSERT into person select ' Person1 ', 20INSERT into person select ' Person2 ', 30INSERT into person select ' Person3 ', 40 LINQ to Entities related programs: var context = new T

whether LINQ to SQL or LINQ to Object (Entity frameworks), they provide the developer with insert operations, and insert collection operations, That is, InsertOnSubmit and Insertallonsubmit, the former is to mark an entity as an insert state, and then to mark a collection as an insert state, ...Whether LINQ to