Blazor入门100天 : 身份验证和授权 (3) - DB改Sqlite

news2024/11/13 15:50:57

本节源码

https://github.com/densen2014/Blazor100/tree/Blazor-%E6%95%99%E7%A8%8B15-3/b15blazorIDS

引用 EntityFrameworkCore.Sqlite 库

<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.2" />

配置文件加入Sqlite数据库链接

`appsettings.json`文件加入一行代码 `"IdsSQliteConnection": "Data Source=ids.db;"`

最终文件如下

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=aspnet-b15blazorIDS-f969184b-89a5-4ccf-beeb-911a756ae70a;Trusted_Connection=True;MultipleActiveResultSets=true",
    "IdsSQliteConnection": "Data Source=ids.db;"
  },
  ...
}

使用EF Sqlite 配置

`Program.cs`文件

//EF SqlServer 配置

// Add services to the container.
//var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");

//builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(connectionString));

//EF Sqlite 配置
builder.Services.AddDbContext<ApplicationDbContext>(o => o.UseSqlite(builder.Configuration.GetConnectionString("IdsSQliteConnection")));

重新生成 Migrations 脚本

之前版本是基于localdb,如果不换脚本会出现An error occurred applying migrations, try applying them from the command line错误

删除 Migrations 文件夹

可选: 保留sqlserver的Migrations脚本, 使用从项目中排除菜单

创建新迁移并为其生成 SQL 脚本

打开命令行, VS菜单栏=>工具=>Nuget包管理器=>程序包管理器控制台(Packge Manager Console), 执行以下命令

cd b15blazorIDS
dotnet ef migrations add idsSqlite
dotnet ef database update

完整流程

PM> cd b15blazorIDS
PM> dotnet ef migrations add idsSqlite
Build started...
Build succeeded.
Done. To undo this action, use 'ef migrations remove'
PM> dotnet ef database update
Build started...
Build succeeded.
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (7ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT COUNT(*) FROM "sqlite_master" WHERE "name" = '__EFMigrationsHistory' AND "type" = 'table';
...
Done.
PM>