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Question

我在我的网站上使用此代码来获取MySQL连接类。但通常连接每隔一两个小时就会丢失一次。发生这种情况时，MySQL连接类不起作用，我的网站索引页面无法显示。我不知道这个问题的原因。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;


using MySql.Data.MySqlClient; 
using System.Configuration; 
using System.Data;


namespace hys
{
public class dbIslem
{

    MySqlConnection baglanti = new MySqlConnection(ConfigurationSettings.AppSettings["hys"].ToString());


    // işlem metodlarımız
    public void BaglantiAc()
    {
        try
        {
            //bağlantı durumu kontrol edilip kapalı ise açılır
            if (baglanti.State == ConnectionState.Closed)
            {
                baglanti.Open(); 
            }
    else if(baglanti == null)
            {
                baglanti.Close();
                baglanti.Open();
            }

            // 
        }
        catch (Exception ex)
        {

            ex.Message.ToString();
        }

    }


    public void BaglantiKapat()
    {
        if (baglanti.State == ConnectionState.Open)
        {
            baglanti.Close();
    baglanti = null;

        }


    }


    public void BaglantiDurumu()
    {

        BaglantiAc();
        string baglantiDurumu = baglanti.State.ToString();
        BaglantiKapat();
    }


    public int KayitIslem(string sorguCumlesi)
    {
        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        int sonuc = sorgu.ExecuteNonQuery();
        baglanti.Close();
        return sonuc;

    }


    public int KayitEkle(string sorguCumlesi)
    {
        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        int sonuc = sorgu.ExecuteNonQuery();
        baglanti.Close();
        return sonuc;

    }

    public int KayitDuzenle(string sorguCumlesi)
    {
        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        int sonuc = sorgu.ExecuteNonQuery();
        baglanti.Close();
        return sonuc;

    }

    public int KayitSil(string sorguCumlesi)
    {
        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        int sonuc = sorgu.ExecuteNonQuery();
        baglanti.Close();
        return sonuc;
    }

    public int KayitScalar(string sorguCumlesi)
    {
        BaglantiAc();
        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        int sonuc = Convert.ToInt32(sorgu.ExecuteScalar());
        return sonuc;
    }


    public MySqlDataReader KayitGetir_DataReader(string sorguCumlesi)
    {

        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        MySqlDataReader dr = sorgu.ExecuteReader();
        return dr;

    }


    public DataSet KayitGetir_DataSet(string sorguCumlesi)
    {
        DataSet ds = new DataSet();
        MySqlDataAdapter dtAdapter = new MySqlDataAdapter();

        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);

        dtAdapter.SelectCommand = sorgu;

        try //hatali kayit varsa bile doldur, hata firlatma.
        {
            dtAdapter.Fill(ds);
        }
        catch
        {

        }


        return ds;
    }


    public DataTable KayitGetir_DataTable(string sorguCumlesi)
    {
        DataTable dt = new DataTable();
        MySqlDataAdapter dtAdapter = new MySqlDataAdapter();

        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);

        dtAdapter.SelectCommand = sorgu;
        dtAdapter.Fill(dt);
        return dt;

    }



    public string KayitAra(string sorguCumlesi)
    {
        BaglantiAc();

        MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
        int sonuc = sorgu.ExecuteNonQuery();

        //baglanti.Close();
        string sonucstring = Convert.ToString(sonuc);
        MySqlDataReader okuyucu = sorgu.ExecuteReader(CommandBehavior.CloseConnection);
        //Gelen datayı sonuc değişkenine aktar.    
        while(okuyucu.Read())    
         {
             sonucstring = okuyucu.GetString(0);    
        }    
        okuyucu.Close();


        return sonucstring;

    }

}

}

Answer 1

您应始终关闭连接。而不是做例如。

BaglantiAc();
MySqlCommand sorgu = new MySqlCommand(sorguCumlesi, baglanti);
int sonuc = sorgu.ExecuteNonQuery();
baglanti.Close();
return sonuc;

待办事项

using (MySqlConnection connection = new MySqlConnection(connectionString))
{
    MySqlCommand command = new MySqlCommand(queryString, connection);
    command.Connection.Open();
    command.ExecuteNonQuery();
}

using语句将调用MySqlConnection.Dispose（）和MySqlConnection.Close（）

Answer 2

使用类dbIslem实现IDisposable接口并以这种方式覆盖Dispose（）方法。

public class dbIslem:IDisposable
{

public void Dispose()
{
baglanti.Dispose();
command.Dispose();
}

}