我正在Windows服务的EF Core和Autofac上使用存储库模式。
我有一项服务,需要与数十个具有相同模式(相同dbcontext)但只有不同数据的数据库连接。 如何使用Autofac在我的服务中实现这一目标?贝洛
public class ReportRepository : IReportRepository
{
private readonly ReportDbContext dbContext;
public ReportRepository(ReportDbContext dbContext)
{
this.dbContext = dbContext
}
public SomeModel GetData()
{
return dbContext.SalesData;
}
}
public class ReportService : IReportService
{
private readonly IReportRepository reportRepositoryEUServer;
public ReportService(IReportRepository reportRepositoryEUServer)
{
this.reportRepositoryEUServer = reportRepositoryEUServer
}
public SomeModelDto GenerateReport()
{
var euData = reportRepositoryEUServer.GetData();
// I need to call other servers (e.g LATAM) here and get the data and aggregate them with euData
}
}
答案 0 :(得分:2)
创建基本上下文,包括所有设置,dbset等:
public abstract class BaseContext : DbContext
{
public BaseContext(DbContextOptions options)
: base(options)
{ }
public DbSet<object> FirstSet { get; set; }
...
}
从BaseContext
继承两个数据库
public class LATAMContext : BaseContext
{
public LATAMContext(DbContextOptions<LATAMContext> options) : base(options)
{
}
}
public class EUContext : BaseContext
{
public EUContext(DbContextOptions<EUContext> options) : base(options)
{
}
}
并同时在Startup.cs
public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.AddDbContext<LATAMContext>(options => options.UseSqlServer(Configuration.GetConnectionString("LATAMConnectionString")));
services.AddDbContext<EUContext>(options => options.UseSqlServer(Configuration.GetConnectionString("EUConnectionString")));
// Autofac
var builder = new ContainerBuilder();
// needed only if you plan to inject ICollection<BaseContext>
builder.RegisterType<LATAMContext>().As<BaseContext>();
builder.RegisterType<EUContext>().As<BaseContext>();
builder.Populate(services);
return new AutofacServiceProvider(builder.Build());
}
在appsettings.json
"ConnectionStrings": {
"LATAMConnectionString": "Server=(localdb)\\mssqllocaldb;Database=ContosoUniversity1;Trusted_Connection=True;MultipleActiveResultSets=true",
"EUConnectionString": "Server=(localdb)\\mssqllocaldb;Database=ContosoUniversity1;Trusted_Connection=True;MultipleActiveResultSets=true"
}
现在您可以同时注入两个上下文
public class ReportRepository : IReportRepository
{
private readonly LATAMContext latamDbContext;
private readonly EUContext euDbContext;
public ReportRepository(LATAMContext latamDbContext, EUContext euDbContext)
{
this.latamDbContext = latamDbContext;
this.euDbContext = euDbContext;
}
}
或者如果您打算注入上下文集合
public class ReportRepository : IReportRepository
{
private readonly ICollection<BaseContext> dbContexts;
public ReportRepository(ICollection<BaseContext> dbContexts)
{
this.dbContexts = dbContexts;
}
}
访问特定上下文
var _euContext = dbContexts.FirstOrDefault(x => x is EUContext) as EUContext;
var _latamContext = dbContexts.FirstOrDefault(x => x is LATAMContext) as LATAMContext;