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原因：ABP默认使用的数据库是sqlServer，本地没有安装sqlServer，安装的是mysql，需要更换数据库

ABP版本：9.0

此处以官网TodoApp项目为例

打开EntityFrameworkCore程序集，可以看到默认使用的是sqlServer，此处截图为已安装mysql依赖包

步骤一、安装mysql依赖包

https://abp.io/packages

如果没安装 ABP CLI ，先安装

dotnet tool install -g Volo.Abp.Studio.Cli

安装ABP依赖包

abp add-package Volo.Abp.EntityFrameworkCore.MySQL

安装完mysql依赖包后，sqlserve依赖包可以删除也可以留着

步骤二、更改TodoAppEntityFrameworkCoreModule.cs文件

• 1、将 <font style="color:rgb(214, 51, 132);">UseSqlServer()</font> 改为 <font style="color:rgb(214, 51, 132);">UseMySQL()</font>
• 2、引入 Volo.Abp.EntityFrameworkCore.MySQL 命名空间
• 3、将 <font style="color:rgb(214, 51, 132);">typeof(AbpEntityFrameworkCoreSqlServerModule</font>) 替换为 <font style="color:rgb(214, 51, 132);">typeof(AbpEntityFrameworkCoreMySQLModule)</font>

修改完成代码如下

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Volo.Abp.AuditLogging.EntityFrameworkCore;
using Volo.Abp.BackgroundJobs.EntityFrameworkCore;
using Volo.Abp.BlobStoring.Database.EntityFrameworkCore;
using Volo.Abp.EntityFrameworkCore;
using Volo.Abp.EntityFrameworkCore.MySQL;
using Volo.Abp.FeatureManagement.EntityFrameworkCore;
using Volo.Abp.Identity.EntityFrameworkCore;
using Volo.Abp.Modularity;
using Volo.Abp.OpenIddict.EntityFrameworkCore;
using Volo.Abp.PermissionManagement.EntityFrameworkCore;
using Volo.Abp.SettingManagement.EntityFrameworkCore;
using Volo.Abp.Studio;
using Volo.Abp.TenantManagement.EntityFrameworkCore;namespace TodoApp.EntityFrameworkCore;[DependsOn(typeof(TodoAppDomainModule),typeof(AbpPermissionManagementEntityFrameworkCoreModule),typeof(AbpSettingManagementEntityFrameworkCoreModule),typeof(AbpEntityFrameworkCoreMySQLModule),typeof(AbpBackgroundJobsEntityFrameworkCoreModule),typeof(AbpAuditLoggingEntityFrameworkCoreModule),typeof(AbpFeatureManagementEntityFrameworkCoreModule),typeof(AbpIdentityEntityFrameworkCoreModule),typeof(AbpOpenIddictEntityFrameworkCoreModule),typeof(AbpTenantManagementEntityFrameworkCoreModule),typeof(BlobStoringDatabaseEntityFrameworkCoreModule))]
public class TodoAppEntityFrameworkCoreModule : AbpModule
{public override void PreConfigureServices(ServiceConfigurationContext context){TodoAppEfCoreEntityExtensionMappings.Configure();}public override void ConfigureServices(ServiceConfigurationContext context){context.Services.AddAbpDbContext<TodoAppDbContext>(options =>{/* Remove "includeAllEntities: true" to create* default repositories only for aggregate roots */options.AddDefaultRepositories(includeAllEntities: true);});if (AbpStudioAnalyzeHelper.IsInAnalyzeMode){return;}Configure<AbpDbContextOptions>(options =>{/* The main point to change your DBMS.* See also TodoAppDbContextFactory for EF Core tooling. */options.UseMySQL();});}
}

步骤三、修改TodoAppStoreDbContextFactory.cs

将 UseSqlServer 修改为 UseMySQL

public TodoAppDbContext CreateDbContext(string[] args)
{var configuration = BuildConfiguration();TodoAppEfCoreEntityExtensionMappings.Configure();var builder = new DbContextOptionsBuilder<TodoAppDbContext>().UseMySql(configuration.GetConnectionString("Default"), ServerVersion.Parse("5.7.38-mysql"));return new TodoAppDbContext(builder.Options);
}

步骤四、更改连接字符串

更改appsettings.json配置文件下的连接字符串，TodoApp.Web 和 TodoApp.DbMigrator程序集下

"ConnectionStrings": {"Default": "Server=120.79.25.229;database=todoDatabase;uid=root;pwd=1126438236@qq.com;"},

步骤五、数据库迁移

1、删除TodoApp.EntityFrameworkCore程序集下Migrations文件夹中的所有文件并重新构建解决方案

如果没删除，迁移的时候会报错

2、在包管理控制台上执行迁移命令，注意，默认项目要选 TodoApp.EntityFrameworkCore

执行迁移命令

add-migration "initial"

更新数据库命令

update-database

数据库迁移过程中遇到的错误

1、配置文件appsettings.json中连接字符串错误，