The error message while trying to create a ADO.net Entity Data Model ( Entity Framework 6 ) for MySql Database in Microsoft Visual Studio 2013 "Your project references the latest version of Entity Framework; however, an Entity Framework database prov…
To start using Entity Framework 6 and Visual Studio 2013 is necessary to install MySQL for Visual Studio 1.1.1 Beta and MySQL Connector/Net 6.8.1 Beta MySQL for Visual Studio 1.1.1 Beta can be downloaded with the following link: https://cdn.mysql.com…
Get Entity Framework: http://msdn.microsoft.com/en-us/data/ee712906 Entity Framework 6 Tools for Visual Studio 2012 & 2013: http://www.microsoft.com/en-us/download/details.aspx?id=40762…
在做项目时,通常我们对乐观并发有几种处理模式 1. 告诉用户此数据已被其他人捷足先登,更改了.你就算新一下重来吧. 2.直接把数据覆盖上去,我最大. 3.用被人的数据. 这里给出 code first 的做法 [Table("product")] [JsonObject(IsReference = true)] public class Product { [Key] public int id { get; set; } public string code { get; set;…
Create a new project named MySqlTest Install following packages by right-clicking on the References folder of the project and selecting Manage NuGet Packages... EntityFramework MySql.Data MySql.data.Entity Update the app.config file Add a model and t…
一.创建MySql存储过程 1, CREATE PROCEDURE `InsertAlarmInfo`(in businessindex int, in providerindex int, in alarmtype int, in alarmlevel int,in detecttime DateTime, in alarmdescription varchar(50), in alarmphenomenon int, in subBusinessType int, in business…
直接上代码 [Table("single_table")] public class SingleTable { [Key] public Int32 id { get; set; } //refer http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspx [Required] [Url] [EmailAddress] [RegularExpression(…
有时候我们希望在sql一个表里面的column, 一部分被分化成另一个class 典型的例子是 Address 直接看代码: [Table("member")] public class Member { [Key] public Int32 memberId { get; set; } public string name { get; set; } public virtual Address address { get; set; } } /* 不能公开 - public DbS…
1-1 设置 //DataAnnotation 1-1 | 1-0 table //SQLtable : member , columns : memberId, name //SQL basic logic : 1个table的PK, 是另一个table的PK and FK , 这就是1-1和1-0的关系 [Table("member")] public class Member { [Key] public Int32 memberId { get; set; } public s…
参考 : http://msdn.microsoft.com/en-us/data/jj574232.aspx EF 查询基本上有3中 默认是 Lazy Loading 特色是只有在需要数据的时候EF才会像数据库请求,它不会使用任何inner join 比如我们有一个产品,有很多颜色,(1对多) 那么我们想把每个产品和颜色统统选出来 using (EFDB db = new EFDB()) { var prods = db.prods.ToList(); //像数据库请求prods, 但是不会包…
创建ASP.NET Core MVC应用程序(3)-基于Entity Framework Core(Code First)创建MySQL数据库表 创建数据模型类(POCO类) 在Models文件夹下添加一个User类: namespace MyFirstApp.Models { public class User { public int ID { get; set; } public string Name { get; set; } public string Email { get; se…
开发中遇到的Too high level of nesting for select错误 项目使用了Entity Framework结合Mysql, 遇到了一个非常奇怪的性能问题,一个看起来非常简单的查询通过不了. 报出错误, “Too high level of nesting for select”. 整个查询非常简单,只是从表中取到属于一个集合中的id的数据, 比如从表中取到OfficeId 是1, 2,3,6的数据. Expression<Func<office, bool>&g…
MySQL Connector/Net 6.8.x MySQL Server 5.1 or above Entity Framework 6 assemblies .NET Framework 4.0 or above 参考文档 Entity Framework 6 with MySql 在Entity Framework中使用MySQL HowTo: Using MySQL for Visual Studio in you first ASP.NET MVC Application…
I had been waiting for the latest MySQL connector for .NET to come out so I can move on to the new and sleek Visual Studio 2012 for my projects. Found out connector 6.6.4 has been out which can work with VS2012 so I happily install it. I start a bran…