Question

我正在研究CQRS原型实现，并尝试将Jonathan Oliver的事件存储与MS SQL服务器一起使用：

 _store = Wireup.Init()
            .UsingSqlPersistence("EventStore")
                .InitializeDatabaseSchema()
            .UsingJsonSerialization()
            .Build();

我在app.config中定义了匹配的连接字符串：

<connectionStrings>
    <add name="Business.Domain.Repository.Tests.Properties.Settings.EventStore"
        connectionString="Data Source=EventStore.sdf;" />
</connectionStrings>

我已经尝试过SQL CE，本地SQL，远程SQL服务器的连接字符串的变体，并且始终会收到此错误：

    System.NullReferenceException was caught
  Message=Object reference not set to an instance of an object.
  Source=EventStore
  StackTrace:
       at EventStore.Persistence.SqlPersistence.SqlPersistenceFactory.GetDialect() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Persistence.SqlPersistence\SqlPersistenceFactory.cs:line 53
       at EventStore.Persistence.SqlPersistence.SqlPersistenceFactory.Build() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Persistence.SqlPersistence\SqlPersistenceFactory.cs:line 46
       at EventStore.SqlPersistenceWireup.<>c__DisplayClass4.<.ctor>b__1(NanoContainer c) in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\SqlPersistenceWireup.cs:line 13
       at EventStore.ContainerRegistration.Resolve(NanoContainer container) in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\NanoContainer.cs:line 66
       at EventStore.NanoContainer.Resolve[TService]() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\NanoContainer.cs:line 40
       at EventStore.PersistenceWireup.Build() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\PersistenceWireup.cs:line 47

有没有人遇到这个或者知道我做错了什么？我尝试单步执行源代码，但仍不确定为什么存在空引用。 -Steve

Answer 1

我正在更新现在围绕方言检测的一些错误处理。您需要在连接字符串中添加“providerName”，例如：

 <add name="Business.Domain.Repository.Tests.Properties.Settings.EventStore"
  providerName="System.Data.SqlServerCe.3.5"
  connectionString="Data Source=EventStore.sdf;" />

在连接配置中使用providerName属性允许EventStore知道在连接到数据库实例时使用哪个驱动程序。

Joliver EventStore错误

1 个答案: