convert linq query to sql query online

length range variable.The following is the translated code:... var translatedquery = sampledata.users new {user, length = user. Name.length}) = z.length) new {Name = z.user.name, Length = z.length});.. Each part of the query is appropriately adjusted: for the original query expression, referring directly to user or length, if the reference occurs after the LET c

I talked with others about the performance of linq yesterday. I feel that the performance of linq is not good, but in fact it is still outstanding in terms of performance, except for the ability to write data to SQL, the following is a simple performance test comparison code. Here I will explain that the execution speed of the Code cannot be tested using datetime

Learning and using C # has been 2 months, in this two months of study, deep experience, C # This language is really not suitable for programming beginners to learn, because it is a lot of other languages, not only object-oriented, but also including functional language of many features, leading to it into the characteristics of the Big Bang language. Many aspects of it come out alone, it has to be a book of size, and not necessarily let people suddenly understand.

43 ThenByDescending ORDER BY clause Sort sequences in ascending order based on secondary keywords 44 ToArray Convert a sequence of type ienumerable 45 ToDictionary Converts a sequence of type ienumerable 46 ToList Converts a sequence of type ienumerable 47 ToLookup Puts the elements of a sequence into a

LinQ to SQLLinQ-Integrated Query language. The LINQ Language integration query (Language Integrated query) is a set of extensions for the C # and Visual Basic languages. it allows writing C # or Visual Basic code to manipulate memory data in the same way as querying a databa

rewritten: var result = products .Where(p => p.UnitPrice >= 20) .GroupBy(p => p.CategoryName) .OrderByDescending(g => g.Count()) .Select(g => new { CategoryName = g.Key, ProductCount = g.Count() }); This Code focuses more on "What" rather than "How". It does not explicitly provide the "Operation Method" for filtering, nor involves details such as creating dictionaries. This code can also be rewritten using the built-in DSL in C #3.0, that is, the

the results were simple, but every person with a similar experience would know that the process was that long and difficult. After the user logs in, the personal center needs to display all the classes that the user is in, that is, the Ismyclass in the model MyClass. public class MyClass { Public UserInfo MyInfo {get; set;} Public list Public list } This is a list type and is a collection of data. And then you need another list set, which is Notmyclass, where the user is in the class and

2007.7.20 Li Jianzhong Introduction to LINQ to SQL Object-Oriented Domain: All objects (fields, methods, references ...) Relational Database: Everything is centered on table data (rows, columns, and relationships) Linq to SQL integrates SQL schema information into CLR metada

Let's start with a very simple example of a LINQ query that queries a number less than 5 in an int array and arranges it in order of size: Class Program { static void Main (string[] args) { int[] arr = new int[] {8, 5, 89, 3, 56, 4, 1, 58}; var m = from N in arr where n foreach (var n in m) { Console.WriteLine (n); } Console.ReadLine (); } The above code, in addition to the

-- indirect query of external list using LINQ to SharePoint (2. Copy external list content)} 3. Use LINQ to SharePoint on the customer list to indirectly query the external list data through such a replacement. {SharePoint Study Notes --- splist -- indirect query of exte

There are two types of syntaxes available for you to use when writing a LINQ query: query syntax and method syntax. 1. Introduction to query syntax and method syntax? Query syntax: it is declared and looks similar to an SQL statem

The User table is usually used when we write the "XX management system" project. In some cases, the classification of personnel belongs to the tree structure, except for the highest and lowest layers, the middle layer has relative Parent and Child. When designing a database, we usually addParent_idSuch fields. In this way, we can useUser_idFind out which direct subordinates he/she has, orParent_idFind out who his direct supervisor is. But when we want to passUser_idWhen you

I talked with others about the performance of LINQ yesterday. I feel that the performance of LINQ is not good, but in fact it is still outstanding in terms of performance, except for the ability to write data to SQL, the following is a simple performance test comparison code. Here I will explain that the execution speed of the Code cannot be tested using datetime

LINQ is a new feature of. NET Framework 3.5. It is a feature integrated into the language. With it, we can easily query data. For the average person, pay more attention to the LINQ-SQL, It is a. NET in the better use of An ORM tool. Now, go to the topic. Normally, we use a strong type when writing a

]);$data = $query->all();$data = $query->one(); In fact, there are many database query methods in the yii framework, such: $data = JdCrmSmsUserModel::find()->where([ 'vender_id' => [ $venderId ] ])->all(); Or use findBySql (), findOne (), findAll (), and so on to replace find () for

NHibernate LINQ Query Extension Enhancements (Nineth article)　　In the previous introduction of LINQ to NHibernate, all of the IqueryoverIn fact, LINQ to NHibernate is more powerful. let's first introduce the namespace Nhibernate.linq, which has a more powerful extension of LINQ