convert sql to linq online

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

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

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.

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

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

data model class will match the data type of the database architecture. This means that compilation errors will occur if you try to specify a boolean value to decimal or implicitly convert the numeric type. If the column in the database can be null, the corresponding attribute created in the data model by using the LINQ to SQL designer will be of the Nullable ty

From Zhang Ziyang http://www.cnblogs.com/JimmyZhang/archive/2009/05/18/1459330.html The purpose of this tutorial is to explain an ASP. net mvc application.ProgramCreate a model class. In this tutorial, you will learn how to use Microsoft LINQ to SQL to create model classes and perform database access. In this tutorial, we created a basic movie database application. We try our best to create a Movie Data

ArticleDirectory 1. directly execute SQL query 2. directly execute SQL commands Here we will introduce that the query by using LINQ to SQL is insufficient to meet the needs of specialized tasks. We can use the executequery method to execute the query by using

. designer. cs, where the DataContext class is the main entry point of linq to SQL, that is, the database context that we often refer. Now, the ing relationship with the database has been completed. Let's take a look at the operations related to linq to SQL. Add 1 static void Main (string [] args) 2 {3 // create a dat

Use LINQ to SQL (Part 1) [Original address] using LINQ to SQL (Part 1)[Original article publication date] Saturday, May 19,200 7 AM In the past few months, I have written a series of posts covering some new features in Vs and. NET Framework orcas. Below are links to these posts: Automatic attributes, object initializ

This is a bit of scattered knowledge about LINQ to SQL. If you want to systematically learn about the knowledge of LINQ to SQL, please refer to scottgu's blog Part 1: Introduction to LINQ to SQL Part 2: defining our data model

. Executecommand:windows Phone does not support the execution of Raw Transact-SQL, Data Definition language (DDL), or Data Modeling Language (DML) statements. 2, does not support ADO (for example, DataReader): All data for LINQ to SQL queries will be returned in the collection of types specified by DataContext 3 . Support for Microsoft

\ home \ index. aspx movie m in (ienumerable) viewdata. model ) {%> The above Code contains The above code contains a foreach loop iteration of every item in viewdata. model. The title of each movie is displayed.We can see that in the above Code, we forcibly convert viewdata. Model to the ienumerable type. Only in this way can we iterate the data returned by viewdata. model.If we run the

Part 1 LINQ supports a rich range of extensibility models. This model will help generate different efficient computing factors (domain-specific operators) for different data sources ).. . NET Framework's orcas version will release some built-in libraries that provide support for object (objects), XML, and database-based LINQ. What is LINQ to