插入mysql條目（如果不存在），更新（如果存在）java

Question

我想插入一個不存在的條目，否則更新該條目，我無法使用ON DUPLICATE KEY UPDATE，我對語法感到困惑。 所以我試圖做這樣的事情：

    final String QUERY = "REPLACE INTO skills SET VALUES (" + insert(player) + ") WHERE playername = '" + player.getUsername() + "'";
    statement.execute(QUERY);

    statement.close();
    connection.close();
}

private static String insert(Player player) {
    String stringToReturn = "'" + player.getUsername() + "',";
    for (int index = 0; index < 25; index++) {
        stringToReturn += player.getSkills().getLevels()[index] + "," + ((int) player.getSkills().getXp()[index]) + ",";
    }
    stringToReturn = stringToReturn.substring(0, stringToReturn.length() - 1);
    return stringToReturn;
}

但這是不正確的語法，所以我想知道如何才能做到這一點？

玩家名稱是主鍵

Answer 1

我認為使ON DUPLICATE KEY UPDATE為您工作的正確語法是：

"INSERT INTO skills (playerName, otherColumn) 
    VALUES ('" + player.getUsername() + "', '" + insert(player) +"')
 ON DUPLICATE KEY UPDATE otherColumn = VALUES(otherColumn)";