Mysql insert data not working

Hi!
I have a problem with MYSQL inserting data.
When I try to insert data no error appears but MYSQL is clear.
Can you help me?

Code:

        new BukkitRunnable () {
            public void run () {
                try {
                    Statement stnt = Loader.getConnection().createStatement();
                    stnt.executeUpdate("INSERT INTO players (`NAM`,`RANK`) VALUES ('"+ player.getName() +"','" + "Gracz" + "');");
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }.runTaskAsynchronously(Loader.getInst());

Code:

    public static void mysqlSetup() {
       
        Bukkit.getScheduler().runTaskAsynchronously(getInst(), () -> {

            //connect to database host
            try {
                Class.forName("com.mysql.jdbc.Driver");

                connection = DriverManager.getConnection("jdbc:mysql://mysql.titanaxe.com/xxxx", "xxxx", "xxxx");

            } catch (SQLException e) {
              System.out.println(e.getMessage());
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }

        });
        Bukkit.getServer().getConsoleSender().sendMessage("§e------ MYSQL ---------");
        Bukkit.getServer().getConsoleSender().sendMessage("§fSTATUS: §aCONNECTED");

    }

 

Yes

 

Thank you!
I think it was a database error.
Now all works
My code:

Code:

        new BukkitRunnable () {
            public void run () {
                try {
                    PreparedStatement insert = Loader.getConnection().prepareStatement("INSERT INTO players (`NAM`,`RANK`) VALUES ('"+ player.getName() +"','" + "Gracz" + "');");
                    int results = insert.executeUpdate();
                 
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }.runTaskAsynchronously(Loader.getInst());

 

*facepalm*

That's not how you use prepared statements. Please read the docs. You are still vulnerable to SQL injection and formatting issues.