Question

可能重复：
C# Update Table using SqlCommand.Parameters

我正在尝试使用SqlCommand更新SQL Server表，我认为这是我的T-SQL的语法错误，但这是我到目前为止：

SqlCommand sqlCmd = new SqlCommand(
   "UPDATE yak_tickets 
    SET email = @emailParam, subject = @subjectParam, text = @textParam, 
        statusid = @statusIDParam, ticketClass = @ticketClassParam 
    WHERE id = @ticketIDParam", sqlConn);

参数正常工作，但是，当我运行代码时，表永远不会更新。任何帮助将不胜感激=）

以下是代码的其余部分：

    #region Parameters
    /* Parameters */
    sqlCmd.Parameters.Add("@ticketIDParam", SqlDbType.BigInt);
    sqlCmd.Parameters["@ticketIDParam"].Value = ticketID;

    sqlCmd.Parameters.Add("@emailParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@emailParam"].Value = ticketToBeSubmitted.getEmail();

    sqlCmd.Parameters.Add("@subjectParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@subjectParam"].Value = ticketToBeSubmitted.getSubject();

    sqlCmd.Parameters.Add("@textParam", SqlDbType.Text);
    sqlCmd.Parameters["@textParam"].Value = ticketToBeSubmitted.getTicketContent();

    sqlCmd.Parameters.Add("@statusIDParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@statusIDParam"].Value = ticketToBeSubmitted.getStatus();

    sqlCmd.Parameters.Add("@ticketClassParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@ticketClassParam"].Value = ticketToBeSubmitted.getTicketClass();
    #endregion

    #region Try/Catch/Finally
    /* Try/Catch/Finally */

    try
    {
        sqlConn.Open();
        sqlCmd.ExecuteNonQuery();
    }
    catch (SqlException sqlEx)
    {
        sqlErrorLabel.Text = sqlEx.ToString();
        sqlErrorLabel.ForeColor = System.Drawing.Color.Red;
    }
    finally
    {
        sqlConn.Close();
    }

该方法的签名：

  public static void updateTicketInDatabase(Ticket ticketToBeSubmitted, Label sqlErrorLabel, int ticketID)

我通过分析器运行它，它的功能如下。

Page Loads ->
Audit Login: -- Sets a bunch of stuff (irrelevant)
SQL:BatchStarting -- SELECT * from yak_tickets
SQL:BatchCompleted -- SELECT * from yak_tickets
Audit Logout


Button Click Event ->
RPC:Completed: -- exec sp_reset_connection
Audit Login: -- Sets some more stuff
SQL:BatchStarting -- SELECT * from yak_tickets
SQL:BatchCompleted -- SELECT * from yak_tickets

以下是表单背后的代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using YakStudios_Support.Includes;

namespace YakStudios_Support.ys_admin
{
    public partial class UpdateTicket : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            int ticketID = Convert.ToInt32(Request.QueryString["ticketID"]); // Grabs the ?ticketid number from the URL
            Ticket ticketBeingUpdated = TicketDatabase.selectTicketFromDatabase(sqlErrorLabel, 1); // Creates a new Ticket object to be used by the form to populate the text boxes

            /* Form Field Population */
            // Email
            emailTxt.Text = ticketBeingUpdated.getEmail();

            // Date Submitted
            dateSubText.Text = ticketBeingUpdated.getDateSubmitted().ToString();

            // Ticket Class
            classDropDown.SelectedValue = ticketBeingUpdated.getTicketClass();

            // Ticket Status
            statusDrop.SelectedValue = ticketBeingUpdated.getStatus();

            // Subject
            subjectTxt.Text = ticketBeingUpdated.getSubject();

            // Text
            textTxt.Text = ticketBeingUpdated.getTicketContent();
        }

        protected void editBtn_Click(object sender, EventArgs e)
        {
            emailTxt.Enabled = true;
            dateSubText.Enabled = true;
            classDropDown.Enabled = true;
            statusDrop.Enabled = true;
            subjectTxt.Enabled = true;
            textTxt.Enabled = true;
        }

        protected void submitBtn_Click(object sender, EventArgs e)
        {
            int ticketID = Convert.ToInt32(Request.QueryString["ticketID"]); // Grabs the ?ticketid number from the URL
            DateTime convertedDate = Convert.ToDateTime(dateSubText.Text);
            Ticket ticketUpdated = new Ticket(emailTxt.Text, convertedDate, subjectTxt.Text, textTxt.Text, statusDrop.SelectedValue, classDropDown.SelectedValue);
            //Ticket ticketUpdated = new Ticket(emailTxt.Text, subjectTxt.Text, textTxt.Text, classDropDown.SelectedValue);
            Response.Write(TicketDatabase.updateTicketInDatabase(ticketUpdated, sqlErrorLabel, 1));
            //Response.Redirect("ticketqueue.aspx");
        }
    }
}

我觉得它正在做什么，它是否正在再次运行我的select方法，这就是它在页面加载时应该做的事情。这是由刷新页面按钮引起的吗？

Answer 1

在ExecuteNonQuery上添加一个断点，检查你的sqlCommand对象，用sqlcommand查看参数，并确保将TicketId设置为你期望的值，因为你的更新是由ticketId驱动的，确保它是正确设置，或尝试直接在SQL服务器上运行TSQL等价物，我的猜测是你的ticketId变量没有被设置，代码看起来很乍看。

C＃使用SqlCommand.Parameters ASP.NET更新表

1 个答案: