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MySQL-- Entity Framework Code First(EF Code First)

一条咸鱼的干货 2022-06-24 阅读 67

使用MySQL和 Entity Framework Code First(EF Code First)创建数据库。

1、新建控制台项目ConsoleApp1,使用管理NuGet程序,添加MySql.Data.Entities,MySql.Data.Entities(会自动安装依赖项MySql.Data,EntityFramework)

2、安装程序包以后如下:

MySQL-- Entity Framework Code First(EF Code First)_sql

MySQL-- Entity Framework Code First(EF Code First)_mysql_02

 

 

 

 3、在app.config中添加如下,如果没有app.config,手动创建一个即可。

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<!--添加mysql连接字符串-->
<add name="conn" connectionString="server=localhost;port=3306;uid=root;pwd=mysql@123456;database=testdb;" providerName="MySql.Data.MySqlClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v13.0" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
<!--添加Asp.Net EF访问Mysql数据库,否则报错:No Entity Framework provider found for the ADO.NET provider with invariant name 'MySql.Data.MySqlClient'.-->
<provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
</providers>
</entityFramework>
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient" />
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.8.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>
</system.data>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Runtime.CompilerServices.Unsafe" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Buffers" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-4.0.3.0" newVersion="4.0.3.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="MySql.Data" publicKeyToken="c5687fc88969c44d" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-6.8.8.0" newVersion="6.8.8.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>

注意:上述红色标记的地方

4、添加数据上下文MyDBContext,代码如下:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;
using System.Text;

namespace ConsoleApp1
{
public class MyDBContext : DbContext
{
public DbSet<Testmy> Testmies { get; set; }
public MyDBContext(string nameOrConnectionString) : base(nameOrConnectionString)
{

}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Testmy>().ToTable($"tbl-{typeof(Testmy)}")
.HasKey(a => a.Id)
.Property(a => a.Id)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
base.OnModelCreating(modelBuilder);
}
}

public class Testmy
{
public int Id { get; set; }
public string Name { get; set; }

}
}

5、Program添加如下代码:

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp1
{
public class Program
{
static void Main(string[] args)
{
using (var db = new MyDBContext("name=conn"))
{
var isCreate = db.Database.CreateIfNotExists();
for (int i = 0; i < 10; i++)
{
db.Testmies.Add(new Testmy { Name = $"{i}--名字" });
}

db.SaveChanges();
}
Console.WriteLine("创建成功");
Console.Read();
}
}
}

6、运行结果:

MySQL-- Entity Framework Code First(EF Code First)_ide_03

 下载:​​使用MySQL和EntityFrameworkCodeFirst(EFCodeFirst)创建数据库。-Microsoft文档类资源-CSDN下载​​

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