在單個webapi控制器中使用多個數據庫

Question

我有一個帶有EntityFramework（2.1）的dotnet核心（2.1）webapi項目

我有一個IProjectRepository接口：

public interface IProjectRepository
{
    void GetProject(Guid id);
    void DeleteProject(Guid id);
    Project CreateProject(Project prj);
    int SaveChanges();
}

我也在ProjectRepository類中實現了它：

public class ProjectRepository : IProjectRepository
{
    private readonly ProjectContext context;

    public ProjectRepository(ProjectContext context)
    {
        this.context = context;
    }

    public Project GetProject(Guid id)
    {
        return context.Projects.Find( id );
    }

    public void DeleteProject(Guid id)
    {
        context.Projects.Remove( project );
    }

    public void CreateProject(Project prj)
    {
        context.Projects.Add(project);
    }

    public int SaveChanges()
    {
        return context.SaveChanges();
    }
}

此外，我有一個ProjectsController ：

[Route( "api/[controller]" )]
[ApiController]
public class ProjectsController : ControllerBase
{
    private readonly IProjectRepository projectRepository;

    public ProjectsController(IProjectRepository projectRepository)
    {
        this.projectRepository = projectRepository;
    }

    [HttpGet( "{id}", Name = "GetProject" )]
    public ActionResult<Project> GetProjectById( Guid id )
    {
        Project project = projectRepository.GetProject( id );

        if ( project == null )
        {
            return NotFound();
        }
        return project;
    }

    [HttpDelete( "{id}" )]
    public IActionResult DeleteProject( Guid id )
    {
        Project project = projectRepository.GetProject( id );

        if ( project == null )
        {
            return NotFound();
        }

        projectRepository.RemoveProject( project );
        projectRepository.SaveChanges();
        return NoContent();
    }

    /* etc. */
}

我正在Startup.cs - ConfigureServices函數中配置存儲庫：

services.AddDbContext<ProjectContext>( opt => opt.UseSqlite( "Data Source=" + projectsPath + "\\Projects.db" ) );
services.AddScoped<IProjectRepository, ProjectRepository>();

我要實現的是在單個控制器內使用不同的數據庫，並使用單個Model 。 因此，假設我在ProjectController有兩個不同的HttpPost -Requests：

[HttpPost("{id}/foo")]

和

[HttpPost("{id}/bar")]

在foo情況下，我想寫到foo.db ；在bar情況下，我想寫到bar.db 簡單地將多個調用添加到services.AddDbContext<ProjectContext>顯然是行不通的。 什么是達到我的目標的好方法？

Answer 1

簡單地將多個調用添加到services.AddDbContext顯然是行不通的。

如果您使用繼承並通過子類調用AddDbContext ，則該方法將起作用。

定義另外兩個從ProjectContext繼承的上下文。

public class FooContext : ProjectContext {}

public class BarContext : ProjectContext {}

然后使用不同的連接字符串注冊它們。

services.AddDbContext<FooContext>(opt => opt.UseSqlite("..."))

services.AddDbContext<BarContext>(opt => opt.UseSqlite("..."))