如何在 ExecuteNonQuery 上调试空对象字段值？

Question

我已将一个包含多个字段值的类型化对象传递给一个调用 Insert 存储过程的 SQL 命令。在调试时，我可以看到每个字段都有一个值，并且没有一个为空。

但是当我进一步调试db.ExecuteNonQuery 调用时，我得到一个SQL 异常，指出Application 字段为空。虽然在执行这个命令之前它不是 null 并且有一个字符串值。

我检查了通常的调试步骤，模型字段类型与DbCommand 中的类型匹配。我还在执行查询之前检查了escalation.Application 值，该查询按预期填充了字符串值。

问题：

有谁知道为什么ExecuteNonQuery 上的字段值被评估为空？

代码：

• DAL 类 -

  public bool InsertWebReq(Escalation escalation)
  {
      Database db = null;
      string sqlCommand = "";
  
      try
      {
          DatabaseProviderFactory factory = new DatabaseProviderFactory();
          db = factory.Create("NOTIFICATION");
  
          sqlCommand = "CREATE_ESCALATION";
  
          using (DbCommand dbCommand = db.GetStoredProcCommand(sqlCommand))
          {
              db.AddInParameter(dbCommand, "Application", DbType.String, escalation.Application);
              db.AddInParameter(dbCommand, "EM", DbType.String, escalation.EM);
              db.AddInParameter(dbCommand, "EscalationActions", DbType.String, escalation.EscalationActions);
              db.AddInParameter(dbCommand, "ProblemStatement", DbType.String, escalation.ProblemStatement);
              db.AddInParameter(dbCommand, "status", DbType.String, escalation.status);
              db.AddInParameter(dbCommand, "UpdatedBy", DbType.String, escalation.UpdatedBy);
              db.AddInParameter(dbCommand, "UpdatedTime", DbType.DateTime, escalation.UpdatedTime);
              db.AddInParameter(dbCommand, "Impact", DbType.String, escalation.Impact);
  
              db.ExecuteNonQuery(dbCommand);
              return true;
          }
      }
      catch (SqlException ex)
      {
          //Log the SQL specific errors
          for (int i = 0; i < ex.Errors.Count; i++)
          {
              StringBuilder errorMessages = new StringBuilder();
  
              errorMessages.Append("Index #" + i + "\n" +
                  "Message: " + ex.Errors[i].Message + "\n" +
                  "LineNumber: " + ex.Errors[i].LineNumber + "\n" +
                  "Source: " + ex.Errors[i].Source + "\n" +
                  "Procedure: " + ex.Errors[i].Procedure + "\n");
          }
  
          MyLogger.FileLogger.ErrorFormat("{0} - {1}", sqlCommand, ex.Message);
          return false;
      }
  }
  

• 型号-

  public partial class Escalation
  {
      public int ID { get; set; }
      public string Application { get; set; }
      public string EM { get; set; }
      public string status { get; set; }
      public string ProblemStatement { get; set; }
      public string Impact { get; set; }
      public string EscalationActions { get; set; }
      public System.DateTime UpdatedTime { get; set; }
      public string UpdatedBy { get; set; }
  }
  

• 应用列表的Html元素-

                          <div class="form-adjacent">
                              <label class="col-md-3 control-label" for="App">App</label>
                              <div class="col-md-8">
                                  <select id="App" name="Application" onchange="" class="form-control">
                                      <option value="SAP">SAP</option>
                                      <option value="EME">EME</option>
                                  </select>
                              </div>
                          </div>
  

Answer 1

通常，数据库参数必须以@ 开头。因此，如果您为此更改代码：

db.AddInParameter(dbCommand, "@Application", DbType.String, escalation.Application);
db.AddInParameter(dbCommand, "@EM", DbType.String, escalation.EM);
db.AddInParameter(dbCommand, "@EscalationActions", DbType.String, escalation.EscalationActions);
db.AddInParameter(dbCommand, "@ProblemStatement", DbType.String, escalation.ProblemStatement);
db.AddInParameter(dbCommand, "@status", DbType.String, escalation.status);
db.AddInParameter(dbCommand, "@UpdatedBy", DbType.String, escalation.UpdatedBy);
db.AddInParameter(dbCommand, "@UpdatedTime", DbType.DateTime, escalation.UpdatedTime);
db.AddInParameter(dbCommand, "@Impact", DbType.String, escalation.Impact);

它应该可以工作。