package me.xxx;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.UUID;

import org.bukkit.entity.Player;

public class L2 {
 DiscordBot plugin = DiscordBot.getPlugin(DiscordBot.class);

 public boolean playerExists(UUID uuid){

	 try {
	 PreparedStatement statement = plugin.getConnection().prepareStatement("SELECT * FROM " + plugin.table + "WHERE UUID =?");
	 statement.setString(1, uuid.toString());

	 ResultSet results = statement.executeQuery();
	 if(results.next()) {

	 }

 } catch (SQLException e) {
	 e.printStackTrace();
 }
 return false;
}
public void createPlayer(final UUID uuid, Player player) {
	try {
		PreparedStatement statement = plugin.getConnection().prepareStatement("SELECT * FROM " + plugin.table + "WHERE UUID =?");
		 statement.setString(1, uuid.toString());
		 statement.setString(1, uuid.toString());
		 ResultSet results = statement.executeQuery();
		 results.next();
		 if(!(playerExists(uuid) != true)) {
			 PreparedStatement insert = plugin.getConnection().prepareStatement("INSERT INTO " + plugin.table + "(UUID, NAME, RANK) VALUE (?,?,?)");
			 insert.setString(1, uuid.toString());
			 insert.setString(2, player.getName());
			 insert.setString(3, player.getPrimaryGroup(player));
		 }
	} catch (SQLException e) {
		e.printStackTrace();
	}
}
}













Main class below. Second class above.






package me.xxx;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;

import net.milkbowl.vault.permission.Permission;



public class DiscordBot extends JavaPlugin {
	public static Permission permission = null;
	private Connection connection;
	public String host, database, username, password, table;
	public int port;
	public Connection getConnection() {
		return connection;
	}

	public void onEnable() {
	 registerConfig();
	mysqlSetup();


 }



private void registerConfig() {
	getConfig().options().copyDefaults(true);
	saveConfig();
}
public void setConnection(Connection connection) {
	this.connection = connection;
}
public void mysqlSetup() {
	host = getConfig().getString("Dbhost");
	database = getConfig().getString("Db");
	username = getConfig().getString("Dbname");
	password = getConfig().getString("Dbpass");
	port = getConfig().getInt("Dbport");
	table = getConfig().getString("Table");

	try{

		synchronized (this){
			if(getConnection() != null && !getConnection().isClosed()){
				return;
			}

			Class.forName("com.mysql.jdbc.Driver");

			setConnection( DriverManager.getConnection("jdbc:mysql://" + this.host + ":" + this.port + "/" + this.database, this.username, this.password));

			Bukkit.getConsoleSender().sendMessage(ChatColor.GREEN + "MYSQL CONNECTED");
		}
	}catch(SQLException e){
		e.printStackTrace();
	}catch(ClassNotFoundException e){
		e.printStackTrace();
	}
}





public void onDisable() {

saveConfig();


 }

 public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {


	 if (cmd.getName().equalsIgnoreCase("rank") && sender instanceof Player) {

		 Player player = (Player) sender;



	 }

	 return false;
 }
 private boolean setupPermissions()
 {
     RegisteredServiceProvider<Permission> permissionProvider = getServer().getServicesManager().getRegistration(net.milkbowl.vault.permission.Permission.class);
     if (permissionProvider != null) {
         permission = permissionProvider.getProvider();
     }
     return (permission != null);
 }