convert linq query to sql query online

In the previous article LINQ to SQL Advanced Series (vi), we mentioned dynamic queries that use object. This article on the basis of the above, and then do more in-depth extension. At the same time fix some of the above wrong places. 1, the dynamic query of object continued The first thing to do is to change the function of find to an extension method. An exten

Label:In the data query, often encountered the need to dynamically build query conditions. Using LINQ to implement this requirement may be more cumbersome than stitching up SQL statements in the past. This article describes 3 ways to dynamically build query conditions at run

multiple table connection queries are often used in queries about databases, where the query functionality for LINQ is simply presented. 1, single-table query [CSharp] View plain copyvarquery = fromTcinchDb.tbclasswhereTc. ClassID = ="1" //query Form Tbclass Select New{ClassID=TC. ClassID, C

Tags: block UPN CTE SEL ext GES log Technology share Ror 1 varquery = fromT0inchcontext. Expresssendmaster2Join T1inchcontext. Supplier on T0. Suppliercode equals T1. Suppliercode3Join T2inchcontext. Expresssendpackagerule on T0. Areaid equals T2. Id into T0_join4 fromT0_t2inchT0_join. DefaultIfEmpty ()5 whereT0. Id = =MasterID6 Select NewExpresspackageofflinemodel7 { 8Packweight =t0. Weight,9Suppliercode =t1. Suppliercode,TenSupplierName =t1. Name, OneSenddate =t0. Senddate, AOneselfnumber =t0

Label:From C # in Depth (3rd)-Jon Skeet using (Linqdemodatacontext db = new Linqdemodatacontext ()) { var filtered = from P in db. Products joins s in Db. Suppliers on p.supplierid equals S.supplierid where P.price > s.name, p.name select new {s Uppliername = s.name, ProductName = p.name}; foreach (Var v in filtered) { Console.WriteLine ("Supplier={0}; Product={1} ", v.suppliername, v.productname); } } 　　 That's impressive enough, but if you ' re performance-conscious, you'll be wonderingWhy

on the criteria API, the main function is to convert a simple LINQ expression to the criteria API. Due to the limited functionality of the Criteria API, there are many inherent limitations (the join and subquery functions are not supported ). If you use nhibernate2.1.0ga or nhibernate2.1.2ga, you can download and use nhiberante. LINQ. dll, which is not described

(configurationmanager.connectionstrings["db2016connectionstring"]. Connectionstring.tostring ()); News Info=NewNews (); Info.content=TextBox1.Text; LqDB.news.InsertOnSubmit (info); Lqdb.submitchanges (); Page.ClientScript.RegisterStartupScript (GetType (),"","alert (' Publish Success '); Location.href= ' Default.aspx '",true); } } modifying data protected voidPage_Load (Objectsender, EventArgs e) {Linqdbdatacontext lqdb=NewLinqdbdatacontext (configurationmanager.connec

Auxiliary classes1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Linq.Expressions;5 usingSystem.Text;6 usingSystem.Threading.Tasks;7 8 namespaceDrision.Framework.Logic.NYZF9 {Ten Public Static classPredicatebuilder One { A Public StaticExpressionBOOL>> truereturnf =true; } - Public StaticExpressionBOOL>> falsereturnf =false; } - the Public StaticExpressionBOOL>> or ThisExpressionBOOL>>Expr1, -ExpressionBOOL>>expr2) - {

LINQ: starts to use LINQ (4)-LINQ to query the type relation of the operation.Start to use LINQ (4)-the type Relationship of the LINQ query operation. The data source,

For example, I want to convert String [] str = {"4", "5", "6"} to a String of "'4', '5', and '6. In this way, I can use SQL query: select * from tableName id in (string.The source code implemented in the project is as follows:Copy codeThe Code is as follows:StringBuffer idsStr = new StringBuffer ();For (int I = 0; I If (I> 0 ){IdsStr. append (",");}IdsStr. append

If you can use SQL computing to return results during mysql query, you can use php to handle the returned results first. For example, you can convert the case sensitivity of fields, in general, how do you perform mysql query? If you can use SQL computing to return good resul

criteria, and the corresponding grouping is found. However, the intermediate table we get is the group number. Then we have to convert the corresponding time according to the group number: Logtime=group_num*5/1440+to_date (date, ' Yyyy-mm-dd ') So: SELECT (To_date (DATE, ' yyyy-mm-dd hh24:mi ') + Group_num * 5/(each)) LogTimeSo we can query the condition by the point of time 1. The specific

This article describes how to convert an integer into an IP string in a SQL query statement. If you need it, refer to explain. This article describes how to convert an integer into an IP string in a SQL query statement. If you nee

The structure of the datasheet is-- The code is as follows Copy Code CREATE TABLE [dbo]. [Ac_mainctls_new] ([ID] [int] NULL,[Ctlip] [bigint] Null[Ctlname] [Char] () COLLATE chinese_prc_ci_as NULL,) Where Ctlip is the IP address of the device, stored in an integer manner. Although you can use a program to convert an integer to an IP string, there is a bit more trouble with a process. So I want to turn it into an

Stack in SQL (small hint): The following requirements are used to convert the result set to a string using the SQL implementation. As follows: There are at least three ways to do the conversion: 1. In. NET, it is common practice to remove the result set in a DataTable and then use the Foreach loop to take out each

Use LinQ to query data objects, and use linq to implement data objects. As a result of project requirements, I have come into contact with LinQ. After some time of study, I have a simple understanding of LinQ. This article will briefly describe this topic. First of all, we s

SQL query case: convert a column to a row using UNION ALL. After the conversion of rows and columns, you may encounter the need to replace columns. Create table TestColRow (Name VARCHAR (10 ),East INT,South INT,West INT,North INT); Insert into TestColRowVALUES ('zhang san', 1, 2, 3, 4 ); Insert into TestColRowVALUES ('Lee 4', 5, 6, 7, 8 ); Processing with