convert linq query to sql query online

First, the LINQ advanced Search1. Fuzzy check (string contains)View Code2. Check the beginning (StartsWith, start with XX)Public list3. Check the endPublic list4. The array length (number) foundCList. Count ()5. Max value: Max (r = r.price);Public decimal? Selectmax () { return Con.car.Max (r = r.price); }6. Minimum value: min (r = r.price);Public decimal? Selectmin () { return con.car.Min (r = r.price); }7. Average: Average

Today, for project reasons, we need to use C # to parse the XML file. Because we use the 3.5 framework, we want to try the water with the LINQ to XML. So I tried it on msdn. Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Xelement Root = Xelement. Load ( " Projectsoruce. xml " ); Ienumerable Xelement > Resources = From El In Root. descendants ( " Task " )Select El; Foreac

Join join query with Linq Using System; using System. collections. generic; using System. linq; using System. text; using System. threading. tasks; namespace LINQ01 {class Program {static void Main (string [] args) {// initialize martial arts master var masterList = new List

SQL two simple paging query methods, SQL paging Query Method In the past, we may have used the skip and take method of linq for paging queries, but few of them write SQL paging queries by themselves, because most of the time, we

greater than 1, the value of the third output is null, and the last one to 2 does not satisfy the condition and stops execution, so the output is: Generating classes For the last generated class, it is not the previous extension method, but the normal static methodRange can only produce integer sequences, repeat can only produce generic sequencesExample:var result = System.Linq.Enumerable.Repeat (DateTime.Now, ten); Show current date, and number of timesThe five major categorie

Grouplist is the raw data set,listSortOrder is the sort type, desc or ASCSortname is the Sort property name1. Use reflection.Private Static ObjectGetPropertyValue (ObjectObjstringProperty ) {System.Reflection.PropertyInfo PropertyInfo=obj. GetType (). GetProperty (property); returnPropertyinfo.getvalue (obj,NULL);} varResultlist = SortOrder = ="desc"? Grouplist.orderbydescending (p = getpropertyvalue (P, sortname)): Grouplist.orderby (p =GetPropertyValue (P, sortname));//

) { //build parameter map (from parameters of second to parameters of first) varMap = first. Parameters.select ((f, i) = =New{F, s = second. Parameters[i]}). ToDictionary (p = p.s, p =p.f); //Replace parameters in the second lambda expression with parameters from the first varSecondbody =parameterrebinder.replaceparameters (map, second. Body); //apply composition of lambda expression bodies to parameters from the first expression returnExpre

View code 1 // 1. query all the girls in the list, whose ages are less than 18, and sort them in descending order. 2 // 2. query the students whose names start with "Wang" and whose length is 3. 3 Using System; 4 Using System. Collections. Generic; 5 Using System. LINQ; 6 Public Class Studylinq 7 { 8 Public Static Void

In Linq to object, we can often easily query a variety of sets, such as List I. OfType OperatorFirst, let's look at its signature public static IEnumerable Var q = cars. OfType Ii. Cast forced conversionFrom the signature of Cast, we can know that it can return IEnumerable Public static IEnumerable However, if the type to be converted cannot be converted to T, Invalid-CastException exception. If it is nul

This paper illustrates the thinkphp interval query, statistical query and SQL direct query. Share to everyone for your reference. The specific methods are as follows: First, the interval query: Copy Code code as follows: $data [' ID ']=array (Array (' GT ', 4)

Recently, I have worked on several projects to use the dynamic query function of linq. However, the dynamic query mechanism officially provided by Microsoft is quite complex, and many netizens have released some dynamic query solutions on the Internet, I think those solutions are complicated and difficult to understand

, only anonymous. But if you can new a known class from a List list . http://www.cnblogs.com/studylife/p/3202616.html --------------------------------------------------------------- Called after the new complex type. Asnotracking () on the premise that you do not need to delete the object of change. ---------------------------------------------- The EF is not able to directly new out its own entity classes.First query the anonymous class, and th

Application background: Take the goods as an example, in the basic data to configure the judgment rules of the goods, according to this rule to filter out the eligible set.Create Goods class public class Product {public string Name {get; set;} public string Code {get; set;} public string Unit {get; set;} }Main implementation Methods public void GetProducts () {#region Create list actual app to take value from database var products = new[] { New

varParameterreplacer =NewParameterreplacer (candidateexpr); the + varleft =Parameterreplacer.replace (expleft.body); - varright =Parameterreplacer.replace (expright.body); the varBODY =expression.or (left, right);Bayi the returnExpression.lambdaBOOL>>(body, candidateexpr); the } - } - /// the ///queryable Extension the /// the Public Static classqueryableextensions the { - /// the /

DataRow DRT = null;var tlist = dt. Select ("Atmbs like '%" + d["Two_code"] + "% '"). AsEnumerable (). GroupBy (A = a.fieldTlist. AsParallel (). FORALL (item ={Lock (_lock){DRT = Dtcopy.newrow ();drt["ATMB"] = d["short_name"];drt["Status_missionn"] = Item. Status_missionn;drt["Status_missionncount"] = Item. number;DTCOPY.ROWS.ADD (DRT);}});Private ReadOnly Static Object _lock = new Object ();DataTable Group Query with

Multi-Criteria query in LINQ: from S in data4Join D1 in Data_co on new {S.forecasttime,s.regioncode} equals new {D1. Monidate, D1. Regioncode}But this only implements a join association, and an error occurs when there are multiple joins. Modified as follows: Join D1 in Data_co on S.forecasttime equals D1. Monidatewhere S.REGIONCODE==D1. Regioncode An association that implements multiple join multiple condit

(Object ... params) {try {String sql = "from Mainpagescanresult m"+ "WHERE m.errorpercent > 5.0" + "and M.inneruuid =?"+ "and M.taskid =?";Session session = Sessionfactory.getcurrentsession ();list. Setparameter (0, (String) params[0]). Setparameter (1, (Integer) params[1]). List ();if (!list.isempty ()) {Return List.get (0);}} catch (Exception e) {E.printstacktrace ();}return null;}/*** Querymainpagescanfailbyid (This method to achieve the results o

LINQ enables querying of generic objects or objects that implement the IEnumerable interface. However, non-generic collections such as ArrayList do not implement the IEnumerable interface. Next, let's take a look at how to use LINQ to query Non-generic collections in this case. C# 1public　class　Cars 2{ 3public　string　CarMake　{　get;set;} 4public　string　C

; where ($ data)-> count (); // The array operation is more standard. You can use SQL to directly query and perform more operations flexibly. A. The primary number of queries processes the data read. The result set is returned successfully. if the query fails, the return value is boolean false. $ M = M (); $ Result = $ m->

ThisExpressionBOOL>> Expr1,expressionBOOL>>expr2) $ { $ varinvokedexpr = Expression.invoke (Expr2, Expr1. Parameters.cast()); - returnExpression.lambdaBOOL>> - (Expression.and (expr1. Body, invokedexpr), Expr1. Parameters); the } -}Query method1 PublicPagingintPageNo,intPagesize,daml data)2 {3pagingNULL;4ExpressionBOOL>> Expwhere = queryassembly.true(); 5 using(Istatelesssession session =