- der Wert „links“ ist immer kleiner als der Wert „rechts“
Blatt
Rechts – Links = 1
Knoten
Rechts – Links > 1
Links zum Thema
Nested Sets
Mein Online – Notizbuch / Gehirn
Blatt
Rechts – Links = 1
Knoten
Rechts – Links > 1
Links zum Thema
Nested Sets
Die Beispieldatenbank „world database“ kann man von der MySql-Seite herunterladen.
public static void Main() {
MySqlConnection MySql_Connection;
string MySql_ConnectionString;
MySql_ConnentionString = "server=localhost;";
MySql_ConnectionString += "user=root;";
MySql_ConnectionString += "database=world;";
MySql_ConnectionString += "password=******;";
MySql_Connection = new MySqlConnection(MySql_ConnentionString);
try {
MySql_Connection.Open(); // Verbindung öffnen
string sql = "SELECT Name, HeadOfState FROM Country WHERE Continent='Oceania'";
MySqlCommand MySql_Command = new MySqlCommand(sql, MySql_Connection);
MySqlDataReader MySql_DataReader = MySql_Command.ExecuteReader();
while (MySql_DataReader.Read()){
Console.WriteLine(MySql_DataReader[0] + " -- " + MySql_DataReader[1]);
}
}
catch (Exception ex) {
Console.WriteLine(ex.ToString());
}
MySql_Connection.Close(); // Verbindung schließen
}
public static void Main() {
MySqlConnection MySql_Connection;
string MySql_ConnectionString;
MySql_ConnentionString = "server=localhost;";
MySql_ConnectionString += "user=root;";
MySql_ConnectionString += "database=world;";
MySql_ConnectionString += "password=******;";
MySql_Connection = new MySqlConnection(MySql_ConnentionString);
try {
MySql_Connection.Open(); // Verbindung öffnen
}
catch (Exception ex) {
Console.WriteLine(ex.ToString());
}
MySql_Connection.Close(); // Verbindung schließen
}