通過.NET MVC連接到Oracle DB

Question

我將C＃MVC API連接到Oracle，但是當我運行API並對其進行測試時，出現以下錯誤。 我檢查了.NET參考並安裝了Oracle.Data.Access，此外，我將其刪除並重新安裝了Oracle.Data.Access，但仍然存在相同的錯誤。 這可能是什么？

 {
 "Message": "An error has occurred.",
 "ExceptionMessage": "ORA-12170: TNS:Connect timeout occurred",
 "ExceptionType": "Oracle.DataAccess.Client.OracleException",
 "StackTrace": "   at         Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure, Boolean bCheck)\r\n   at Oracle.DataAccess.Client.OracleException.HandleError(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, Object src)\r\n   at Oracle.DataAccess.Client.OracleConnection.Open()\r\n   at MRF_API.Controllers.ItemController.Get(String searchdesc) in C:\\Users\\nevinj\\Documents\\Visual Studio 2015\\Projects\\MRF_API\\MRF_API\\Controllers\\ItemController.cs:line 88\r\n   at lambda_method(Closure , Object , Object[] )\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
  }

Answer 1

此時，您必須分析的實際問題是ORA-12170：TNS：Connect超時發生 。

您會發現在網上有很多原因可能導致觸發此錯誤，但您首先要檢查的是確保正確設置了連接字符串/ TNS條目。

嘗試使用來自同一台計算機但來自另一個客戶端（例如sqlplus）的相同連接字符串，並查看其是否有效（以確認數據庫已啟動並且可以從客戶端計算機訪問）。