Question

我正在尝试在创建PetaPoco数据库时设置连接，但遇到问题（connectionClosed）

public class DbHelper
{
    static Database _CurrentDb = null;
    public static Database CurrentDb()
    {
        if (_CurrentDb == null)
        {
            string connstr = ConfigurationManager.ConnectionStrings["MainConnectionString"].ConnectionString;
            var conn = ProfiledDbConnection.Get(new SqlConnection(connstr));
            _CurrentDb = new PetaPoco.Database(conn);
        }
        return _CurrentDb;
    }

}

我已阅读此项目https://github.com/toptensoftware/PetaPoco/issues/44，但可以让它发挥作用

这样做的正确方法是什么？

修改

解决方案由Gareth Elms提供：

public class DbHelper
{
    static Database _CurrentDb = null;
    public static Database CurrentDb()
    {
        if (_CurrentDb == null)
        {
            _CurrentDb = new DatabaseWithMVCMiniProfiler("MainConnectionString");
        }
        return _CurrentDb;
    }

}
public class DatabaseWithMVCMiniProfiler : PetaPoco.Database
{
    public DatabaseWithMVCMiniProfiler(IDbConnection connection) : base(connection) { }
    public DatabaseWithMVCMiniProfiler(string connectionStringName) : base(connectionStringName) { }
    public DatabaseWithMVCMiniProfiler(string connectionString, string providerName) : base(connectionString, providerName) { }
    public DatabaseWithMVCMiniProfiler(string connectionString, DbProviderFactory dbProviderFactory) : base(connectionString, dbProviderFactory) { }

    public override IDbConnection OnConnectionOpened( IDbConnection connection)
    {
        // wrap the connection with a profiling connection that tracks timings 
        return MvcMiniProfiler.Data.ProfiledDbConnection.Get( connection as DbConnection, MiniProfiler.Current);
    }
}

Answer 1

我想知道这是不是因为它是一个静态类。在请求之后连接会自动关闭可能会有些奇怪，而petapoco的_sharedConnectionDepth计数器不知道它。我使用你的代码轻松地复制了这个。在github https://github.com/GarethElms/PetaPoco----A-simple-web-app查看我的示例petapoco应用程序，我所做的只是在基本控制器中实例化数据库

Answer 2

正如Schotime所提到的，每个请求对于mvc应用程序来说是最好的。这是我使用Ninject的原因

private static void RegisterServices(IKernel kernel)
{


#if DEBUG
            kernel.Bind<IDatabase>().To<DebugDatabase>()
               .InRequestScope()
               .WithConstructorArgument("connectionStringName", "DebugCnnString");
#else
            kernel.Bind<IDatabase>().To<ReleaseDatabase>()
               .InRequestScope()
               .WithConstructorArgument("connectionStringName", "ReleaseCnnString");
#endif
}

public class DebugDatabase : PetaPoco.Database
{
    public DebugDatabase(string connectionStringName) : base(connectionStringName) { }

    public override IDbConnection OnConnectionOpened(IDbConnection connection)
    {
        // wrap the connection with a profiling connection
        return new ProfiledDbConnection(connection as DbConnection, MiniProfiler.Current);
    }
}

public class ReleaseDatabase : PetaPoco.Database
{
    public ReleaseDatabase(string connectionStringName) : base(connectionStringName)    {   }

    // ... some stuff
}

如何在不更改源的情况下将MVCMiniProfiler与PetaPoco集成

修改

2 个答案: