Question

我有一些問題，我看到互聯網上代碼的和平只有這個與Oledb完成。

我現在有rewrited爲MySQL.data.mysqlclient代碼如下：

MySqlDataReader dr = null; 
     MySqlCommand cmd = null; 
     string cmdstr = "SELECT * FROM users WHERE email='"+UsrName.Text+"' and password='"+PassWrd.Text+"' LIMIT 1"; 
     dr = cmd.ExecuteNonReader(); 
     cmd = new MySqlCommand(cmdstr, connection); 
     cmd.Dispose(); 

     if (dr.Read() == true) 
     { 
      MessageBox.Show("Succesvol ingelogd"); 
     } 
     else 
     { 
      MessageBox.Show("Geen juiste gegevens"); 
     } 
     connection.Close(); 

    } 

現在的問題是爲dr = cmd.ExecuteNonReader()另一種方法。

UPDATE ----------------

string server; 
     string database; 
     string uid; 
     string password; 
     server = "localhost"; 
     database = "cmstt"; 
     uid = "root"; 
     password = ""; 
     string connectionString; 
     connectionString = "SERVER=" + server + ";" + "DATABASE=" + 
     database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";"; 

     MySqlConnection connection = new MySqlConnection(connectionString); 

     connection.Open(); 

     MySqlDataReader dr = null; 
     MySqlCommand cmd = null; 
     string cmdstr = "SELECT * FROM users WHERE email='"+UsrName.Text+"' and pass='"+PassWrd.Text+"' LIMIT 1"; 
     dr = cmd.ExecuteReader(); 
     cmd = new MySqlCommand(cmdstr, connection); 


     if (dr.Read() == true) 
     { 
      MessageBox.Show("Succesvol ingelogd"); 
     } 
     else 
     { 
      MessageBox.Show("Geen juiste gegevens"); 
     } 
     cmd.Dispose(); 
     connection.Close(); 

Answer 1

你過早處置CMD。在關閉連接之前處理它。

Answer 2

這將是ExecuteReader()不ExecuteNonReader()

//這裏提到您的連接和連接字符串。

 connection.open() 

     SqlDataReader dr = null; 
     MySqlCommand cmd = null; 
     string cmdstr = "SELECT * FROM users WHERE email='"+UsrName.Text+"' and password='"+PassWrd.Text+"' LIMIT 1"; 

     cmd = new MySqlCommand(cmdstr, connection); 
     dr = cmd.ExecuteReader(); 

     if (dr.Read() == true) 
     { 
      MessageBox.Show("Succesvol ingelogd"); 
     } 
     else 
     { 
      MessageBox.Show("Geen juiste gegevens"); 
     } 
     connection.Close(); 

    }