Question

我已经将包含多个字段值的类型化对象传递给SQL命令，该命令调用 Insert 存储过程。在调试时，我可以看到每个字段都有一个值，没有一个是空的。

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。虽然它不是null并且在执行此命令之前具有字符串值。

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。此外，我在执行查询之前检查了escalation.Application值，该查询填充了预期的字符串值。

问题：

有谁知道为什么在ExecuteNonQuery上将字段值评估为空？

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;
    }
}

模型 -

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; }
}

应用程序列表的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);

它应该有用。

如何在ExecuteNonQuery上调试null对象字段值？

1 个答案: