Question

我正在使用Visual Studio 2010为我的代码开发一个使用C＃的ASP.NET项目。我进行了一些搜索，但没有找到任何有助于解决这个问题的东西。当我单击更新按钮时，代码会处理但实际上不会更新记录。感谢我对此代码出错的任何指导。

protected void btnUpdate_Click(object sender, EventArgs e)
{

        using (OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\Coins.mdb;"))
        {
            using (OleDbCommand UpdateCoins = new OleDbCommand())
            {
                UpdateCoins.CommandType = CommandType.Text;
                UpdateCoins.CommandText = "UPDATE [Coins] SET CoinName = ?, CurrencyType = ?, CoinType = ?, CoinValue = ?, YearIssued = ?, DateAcquired = ?, Email = ? WHERE ID = 12";

                UpdateCoins.Parameters.AddWithValue("@CoinName", txtCoinName.Text);
                UpdateCoins.Parameters.AddWithValue("@CurrencyType", txtCurrencyType.Text);
                UpdateCoins.Parameters.AddWithValue("@CoinType", txtCoinType.Text);
                UpdateCoins.Parameters.AddWithValue("@CoinValue", txtCoinValue.Text);
                UpdateCoins.Parameters.AddWithValue("@YearIssued", txtYearIssued.Text);
                UpdateCoins.Parameters.AddWithValue("@DateAcquired", txtDateAcquired.Text);
                UpdateCoins.Parameters.AddWithValue("@Email", txtEmail.Text);

                UpdateCoins.Connection = con;
                con.Open();
                UpdateCoins.ExecuteNonQuery();
                con.Close();
            }
        }
        Response.Redirect("DisplayCoin.aspx");
}

Answer 1

我甚至没有想到影响我代码的page_load事件。我把它更改为以下内容，它没有问题。谢谢你的建议。

#include <ctime>
#include <cstdlib>
#include <iostream>
#include <iomanip>

using namespace std;

/* Start: Do Not Change */
const int MAX = 5; 
const int MIN = 1;

// This function takes tree ints as parameters
// and sets them to a random number
int spin(int & n1, int & n2, int & n3)
{
    n1 = rand()%(MAX-MIN)+MIN;
    n2 = rand()%(MAX-MIN)+MIN;
    n3 = rand()%(MAX-MIN)+MIN;
}
/* End: Do Not Change */

int main()
{
    int slot1, slot2, slot3;
    double percent;
    double credits = 1000.00;
    char keepPlaying; 

    srand (time(NULL));

    cout << "Welcome to the slots, you have 1,000.00 credits.\n"
    << "What percentage of credits do you want to bet(0-1)? ";

    cin >> percent; 
    spin(slot1, slot2, slot3); // At this point slot1-3 all have a random value between 1 and 5
                                //spin function 
    cout << "Slot value = " << slot1 << "-" << slot2 << "-" << slot3 << endl;

    while (slot1 != slot2 || slot1 != slot3 || slot2 != slot3)
    {
        if (slot1 == slot2 && slot1 == slot3 && slot2 == slot3)
        {
            cout << "\tYou won " << fixed << setprecision(2) << credits *   percent << " credits!\n";
            credits += (credits * percent); 

            cout << "Continue (y/n)? "; 
            cin >> keepPlaying;

            if (keepPlaying == 'y')
            {
               cout << "You have " << credits << " credits left.\n"; 
               cout << "What percentage of credits do you want to bet(0-1)? ";

                cin >> percent; 

                spin(slot1, slot2, slot3);
                cout << "Slot value = " << slot1 << "-" << slot2 << "-" << slot3 << endl; 

                continue; 
            }

            else if (keepPlaying == 'n')
            {
                cout << "You are leaving with " << credits << " credits." <<  endl; 
                return 0; 
            }
        }

        else
        {
            cout << "\tSorry, you lost " << fixed << setprecision(2) <<  credits * percent << " credits." << endl; 
            credits -= (credits * percent); 

            cout << "Continue (y/n)? "; 
            cin >> keepPlaying;

            if (keepPlaying == 'y' && credits != 0)
            {
                cout << "You have " << credits << " credits left.\n"; 
                cout << "What percentage of credits do you want to bet(0-1)? ";

                cin >> percent; 

                spin(slot1, slot2, slot3);
                cout << "Slot value = " << slot1 << "-" << slot2 << "-" << slot3 << endl;

                continue; 
            }

            else if (keepPlaying == 'y' && credits == 0)
            {
                cout << "Get out of here bum!" << endl; 
                return 0; 
            }

            else if (keepPlaying == 'n')
            {
                cout << "You are leaving with " << fixed << setprecision(2) << credits << " credits." << endl; 
                return 0; 
            }
        }
    }

    return 0; 
}`

OleDb UPDATE查询后面的代码不使用WHERE子句更新记录

1 个答案: