dapper | 易学教程

记一次ORM的权衡和取舍

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面对ORM的选型，有些人是根据自己熟悉程度来评判，有些人是根据他人的推荐来抉择，有些人觉得都差不多，随便了。当自己要真正做选择的时候，以上的这些依据都无法真正说服自己，因为不同的业务需求，不同的团队构成都会造成选型的差异，而且特别大，这里谈一谈自己的选型。 1.1需求背景介绍我所在的公司是做互联网产品，对性能有着极致的要求；后台人数也不算多，尽量人尽其用，技术水平呈梯度分布；因为产品需要长期维护，所以对代码质量要求非常高，必须做评审和单元测试；对技术的可维护性，可扩展性要求很高，因为资源有限；因为资源有限，所以在生产力和性能之间需要做一个平衡； 1.2需求分析难点　　我们知道没有完美的技术，鱼和熊掌无法兼得，所以我们必须择优录取，这里的复杂度在于你要对所选择的技术优缺点有一个 360度的环评，最好能展示各自优缺点对比一览图，最后依据数据来证明你的选择对的，是对团队和业务负责的。现状　　不知道你有没有呆过这样的团队：选什么技术从不讨论，大伙各自闷声干，等干出来你才知道原来对方是用的IBatis.NET。你是后面入职的，你只能在前人的基础上做维护，尽管你觉得这个技术不是最优的，但是你也无法了解当初为什么做这样的选择。在入职后，没有规范的技术培训和规范，你一边Google一边编码一边骂娘。　

.net core 2.0+superui +Dapper.SimpleCRUD+mysql+NLog

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**_ .net core 2.0+superui +Dapper.SimpleCRUD+mysql+NLog _** 前端框架 superui http://www.supermgr.cn/ 1、组件丰富，扩展强大大量优秀成熟开源组件，兼容性强，高扩展性。 2、炫酷华丽，风格多样 bootstrap风格UI，华丽而炫酷，组件风格和控制代码分离，风格千变万化！ 3、各种浏览器，全面兼容各种PC浏览器（IE9+、chrome、firefox、safari等)等浏览器，全面兼容，极致体验！ 4、标准化、组件化遵循html5+css3+js标准，兼容性好、扩展性强。数据库orm 访问框架 Dapper.SimpleCRUD https://github.com/ericdc1/Dapper.SimpleCRUD simple CRUD helpers for Dapper 日志管理 NLog 进行文本日志管理实用符合国情的RBAC（基于角色的访问控制），可以直接应用到你的系统。权限资源菜单权限经理和业务员登陆系统拥有的功能菜单是不一样的按钮权限经理能够审批，而业务员不可以来源： https://www.cnblogs.com/lyl6796910/p/7575165.html

Dapper and anonymous Types

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问题 Is it possible to use anonymous types with Dapper? I can see how you can use dynamic i.e. connection.Query<dynamic>(blah, blah, blah) is it then possible to do a .Select(p=> new { A, B ,C }) or some variation of that afterwards? Edit I thought I'd show you how I am using Dapper at the moment. I tend to cache (using an InMemoryCache) data so I just do one big query at the beginning (which is super quick using Dapper) then I use Linq to sort it all out in my Repository. using System; using

Multiple SQL statements in one roundtrip using Dapper.NET

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问题 There is a nice feature in ADO.NET that allows you to send multiple SQL statements to database in one roundtrip and receive results for all statements: var command = new SqlCommand("SELECT count(*) FROM TableA; SELECT count(*) FROM TableB;", connection); using(var reader = command.ExecuteReader()) { reader.Read(); resultA = reader.GetInt32(0); reader.NextResult(); reader.Read(); resultB = reader.GetInt32(0); } Is there a similar feature in Dapper.NET? 回答1: Yes, the Dapper QueryMultiple

Problems connecting to local MySQL server

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问题 I have problems connecting to a local MySQL database. I made sure the server is running and i can connect to the server using the user and password from the connection string and create databases with the terminal. I'm using visual studio community on a mac and MySQL 8.0.16. Example: Program.cs using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; namespace ReadSQL { class Program { static void Main(string[] args) { DataAccess dataAccess = new

Using Dapper with SQL Spatial Types as a parameter

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问题 I've got a system which basically has to do a query like this: SELECT * FROM MyTable WHERE @parameter.STIntersects(MyGeometryColumn) This is quite simple to do when using vanilla SQL parameters, you just have to create your parameter in a non-typical way (where the builder variable is a SqlGeometryBuilder which I use to create a rectangle): command.Parameters.Add(new SqlParameter { UdtTypeName = "geometry", Value = builder.ConstructedGeometry, ParameterName = "@paremeter" }); Now, When I try

Simple inner join result with Dapper?

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问题 I can't seem to find documentation or examples for my problem (been searching a while now). I think my problem is pretty straightforward, so here goes. I have two tables. My primary table is called Persons and the secondary table is PersonEntries. For each person in Person table, i can have 0 or more entries in the PersonEntries table. Like this. Table: Person Id Name Table: PersonEntry PersonId CheckinTime CheckoutTime I have two objects like this public class Person { public string Name;

Get DateTime as UTC with Dapper

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问题 I'm using Dapper to map my entities to SQL Server CE. If I save a DateTime with Kind=Utc , when I read it back I get a DateTime with Kind=Unspecified , which leads to all kind of problems. Example: var f = new Foo { Id = 42, ModificationDate = DateTime.UtcNow }; Console.WriteLine("{0} ({1})", f.ModificationDate, f.ModificationDate.Kind); connection.Execute("insert into Foo(Id, ModificationDate) values(@Id, @ModificationDate)", f); var f2 = connection.Query<Foo>("select * from Foo where Id =

Does Dapper support inserting multiple rows in a single query?

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问题 Does StackExchange.Dapper support the following SQL syntax? INSERT INTO MyTable (a, b, c) VALUES (1, 2, 3), (4, 5, 6), (7, 8, 9); I've seen some examples where you can pass in a List to be inserted but the descriptions I've seen suggest it is just looping and doing multiple inserts. My research suggests doing a single query with multiple rows in it is faster so I'm curious to know if Dapper supports this with a list or not. 回答1: No it doesn't. Actually, bulk insert is one of the most

Dapper vs ADO.Net with reflection which is faster?

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问题 I have studied about Dapper and ADO.NET and performed select tests on both and found that sometimes ADO.NET is faster than Dapper and sometimes is reversed. I understand this could be database issues as i am using SQL Server. As it is stated that reflection is slow and i am using reflection in ADO.NET. So can anyone tell me which approach is the fastest? Here what i coded. Using ADO.NET DashboardResponseModel dashResp = null; SqlConnection conn = new SqlConnection(connStr); try { SqlCommand