摘要

在實際項目中，大多都需要對業務邏輯以及操作數據庫的邏輯進行分成操作，這個時候該如何進行數據的遷移呢？

步驟

上篇文章：EF Core數據遷移操作

比如，我們將數據上下文放在了Data層。

看一下BlogContext內容如下：

public class BlogContext : DbContext{public BlogContext(DbContextOptions options) : base(options){}public DbSet<User> Users { set; get; }}

在appsetting中配置連接字符串

{"ConnectionStrings": {"DefaultConnection": "Server=localhost;database=MyBlogDb;uid=root;pwd=abcd;"},"Logging": {"IncludeScopes": false,"LogLevel": {"Default": "Warning"}} }

在StartUp啟動類中，做如下操作：

using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Hosting; using Microsoft.EntityFrameworkCore; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.DependencyInjection; using Wolfy.Blog.Data;namespace Wolfy.Blog {public class Startup{public Startup(IConfiguration configuration){Configuration = configuration;}public IConfiguration Configuration { get; }// This method gets called by the runtime. Use this method to add services to the container.public void ConfigureServices(IServiceCollection services){
string connStr = Configuration.GetConnectionString("DefaultConnection");services.AddDbContext<BlogContext>(options => options.UseMySQL(connStr,opt => opt.MigrationsAssembly("Wolfy.Blog")));services.AddMvc();}// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.public void Configure(IApplicationBuilder app, IHostingEnvironment env){if (env.IsDevelopment()){app.UseDeveloperExceptionPage();app.UseBrowserLink();}else{app.UseExceptionHandler("/Home/Error");}app.UseStaticFiles();app.UseMvc(routes =>{routes.MapRoute(name: "default",template: "{controller=Home}/{action=Index}/{id?}");});}} }

可以看到上面可以指定遷移程序集

//// 摘要:// Configures the assembly where migrations are maintained for this context.//// 參數:// assemblyName:// The name of the assembly.//// 返回結果:// The same builder instance so that multiple calls can be chained.public virtual TBuilder MigrationsAssembly([CanBeNullAttribute] string assemblyName);

大概意思是配置數據遷移保持的程序集。

總結

一個簡單的用法，遇到了，就記錄一下，希望對你有所幫助

總結

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