Valeur JavaInvalid pour getInt()

Question

J'essaie de créer un script pour bukkit. Il doit aller 1 dans la table mysql s'il tue un zombie. Qu'est-ce qui ne va pas? ou y a-t-il peut-être une autre méthode?

Erreur: java.sql.SQLException: Valeur non valide pour getInt() - 'CraftZombie'

 PreparedStatement kills = connection.prepareStatement("SELECT ? FROM `data` WHERE name=?"); 
     kills.setString(1,entity.toString()); 
     kills.setString(2,name); 
     ResultSet result = kills.executeQuery(); 


     String entity_string = entity.toString(); 

     result.next(); 
     //int score = 1; 
     //score = result.getInt(1); 
     //Integer score2 = (Integer) result.getObject(entity_string); 

     int SC = result.getInt(entity_string); 



     PreparedStatement stat = connection.prepareStatement("UPDATE data SET ?=? WHERE name=?", 
       ResultSet.TYPE_FORWARD_ONLY, 
       ResultSet.CONCUR_UPDATABLE); 
     stat.setString(1,entity.toString()); 
     stat.setInt(2, SC + 1); 
     stat.setString(3,name); 

Answer 1

Tout d'abord, ne pas faire de requête MySQL à l'événement, qui font le décalage du serveur.

Vous devez créer un hashmap avec les données que vous voulez lier au serveur mysql et faire une tâche asynchrone du planificateur qui fait la requête.

Exemple:

package test; 

import java.sql.DriverManager; 
import java.sql.SQLException; 
import java.util.Map.Entry; 
import java.util.UUID; 
import java.util.concurrent.ConcurrentHashMap; 

import org.bukkit.entity.Player; 
import org.bukkit.entity.Zombie; 
import org.bukkit.event.EventHandler; 
import org.bukkit.event.Listener; 
import org.bukkit.event.entity.EntityDeathEvent; 
import org.bukkit.plugin.java.JavaPlugin; 
import org.bukkit.scheduler.BukkitRunnable; 

import com.mysql.jdbc.Connection; 

public class Event extends JavaPlugin implements Listener { 

    // Mysql update data 
    public static ConcurrentHashMap<UUID, Integer> player_zombiekills = new ConcurrentHashMap<UUID, Integer>(); 

    // Mysql connection data 
    public static Connection connection; 
    private String host = "localhost"; 
    private String database = "DB"; 
    private String username = "user"; 
    private String password = "123"; 
    private int port = 3306; 

    //Kill zombie event 
    @EventHandler 
    public void zombieDeath(EntityDeathEvent eve) { 
     if (!(eve.getEntity() instanceof Zombie)) return; // Stop if death is not zombie 
     if (!(eve.getEntity().getKiller() instanceof Player)) return; // Stop if killer is not player 
     UUID uid = eve.getEntity().getKiller().getUniqueId(); // Save player uuid 
     if (player_zombiekills.contains(uid)) player_zombiekills.put(uid, 0); // Set kills 0 if not exist in hashmap 
     player_zombiekills.put(uid, player_zombiekills.get(uid) + 1); // plus 1 kills value 
    } 

    //On enable connection 
    public void onEnable() { 
     try { 
      if (connection != null && !connection.isClosed()) return; 
      Class.forName("com.mysql.jdbc.Driver"); 
      connection = (Connection) DriverManager.getConnection("jdbc:mysql://" + host + ":" + port + "/" + database, username, password); 
      if (!connection.isClosed()) System.out.println("[MySQL] " + "Connected to '" + database + "'"); 
     } catch (Exception e) { 
      System.err.println("[MySQL] " + e.getMessage()); 
     } 

     new BukkitRunnable() { 
      public void run() { 
       // for updates 
       for (Entry<UUID, Integer> ent : player_zombiekills.entrySet()) { 
        try { 
         // send update 
         connection.createStatement().executeUpdate("UPDATE `tablename` SET `zombiekills`=`zombiekills`+" + ent.getValue() + " WHERE `uuid`='" + ent.getKey().toString() + "'"); 
         // Sucess remove entry from hashmap to reset kills 
         player_zombiekills.remove(ent.getKey()); 
        } catch (SQLException e) { // If error 
         System.err.println("[MySQL] " + e.getMessage()); // Print error in console 
        } 
       } 
      } 
     }.runTaskTimerAsynchronously(this, 20, 20 * 60 * 10); // Run async loop every 10 minutes 
    } 
}