LINQ / LINQ to SQL / LINQ to XXX 它们到底有什么区别

一,Linq to EF using System; using System.Runtime.CompilerServices; using System.Linq; using System.Data; namespace EntityframeworkSQL { class Program { static void Main(string[] args) { using (CustomerEntities customerEntities = new CustomerEntities()

SQL LINQ Lambda SELECT * FROM HumanResources.Employee from e in Employees select e Employees   .Select (e => e) SELECT e.LoginID, e.JobTitle FROM HumanResources.Employee AS e from e in Employees select new {e.LoginID, e.JobTitle} Employees   .Select

SQL LINQ Lambda SELECT * FROM HumanResources.Employee from e in Employees select e Employees    .Select (e => e) SELECT e.LoginID, e.JobTitle FROM HumanResources.Employee AS e from e in Employees selectnew {e.LoginID, e.JobTitle} Employees    .Select

 public IEnumerable<VMB_Report> ReportView_List(VMB_ReportConditions requiredModel) { IEnumerable<VMB_Report> resultModel = new List<VMB_Report>(); IQueryable<Merchant> merchantList; merchantList = Report_List(); #region 从Merchan

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 is mapped to an object model expressed in the programming language of the developer. When you execute the

此例子是使用LINQ2Dapper封装,效率优于EntityFramwork,并且支持.NetFramework和.NetCore框架,只依赖于Dapper支持.net framework4.6.1及以上 支持.net core2.0及以上 1.查看查询操作的SQL语句 首先需要保留QuerySet对象,因为根据Linq解析拼接SQL保存在Query对象的SqlProvider中  var query = Connection.QuerySet<T>(); 然后执行该对象,例如 query.L

http://www.cnblogs.com/xianyin05/archive/2012/12/23/2829905.html using Models; using System; using System.Collections.Generic; using System.Data.SQLite; using System.Diagnostics; using System.Linq; using System.Text; namespace Demo2 { class Program {

1. 概述 2. from子句 3. where子句 4. select子句 5. group子句 6. into子句 7. 排序子句 8. let子句 9. join子句 10. 小结 1. 概述 LINQ的全称是Language Integrated Query,中文译成“语言集成查询”.LINQ作为一种查询技术,首先要解决数据源的封装,大致使用了三大组件来实现这个封装,分别是LINQ to Object.LINQ to ADO.NET.LINQ to XML.它们和.NET语言的关系如下:

一.何谓LINQ LINQ:Language Integrated Query语言集成查询,其本质是对ADO.NET结果集通过反射连同泛型特性转换成对象集,实现OR模型的转换 二.优点与缺点 优点:封装了SQL语句,只对对象进行操作,代码量减少 缺点:追求效益的同时牺牲了性能,比起ADO.NET性能稍差,且对复制的sql语句也不好操作 三.支持那些查询 联合.分组.排序.连接查询 四.何谓Linq to sql Linq to sql是LINQ的一部分,全称基于关系型数据库的DotNet语言集成