PHP CSV导入脚本不能替代SQL数据

Question

所以我在我的服务器上运行这个脚本，需要它用我的CSV文件中的数据替换SQL表中的所有数据：

<?php
$databasehost = "localhost"; 
$databasename = "import"; 
$databasetable = "import"; 
$databaseusername="import"; 
$databasepassword = "password"; 
$fieldseparator = ","; 
$lineseparator = "\n";
$csvfile = "test.csv";

if(!file_exists($csvfile)) {
  die("File not found. Make sure you specified the correct path.");
}

try {
    $pdo = new PDO("mysql:host=$databasehost;dbname=$databasename", 
    $databaseusername, $databasepassword,
    array(
        PDO::MYSQL_ATTR_LOCAL_INFILE => true,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
    )
);
} catch (PDOException $e) {
die("database connection failed: ".$e->getMessage());
}

$affectedRows = $pdo->exec("
  LOAD DATA LOCAL INFILE ".$pdo->quote($csvfile)." REPLACE INTO TABLE `$databasetable`
  FIELDS TERMINATED BY ".$pdo->quote($fieldseparator)."
  LINES TERMINATED BY ".$pdo->quote($lineseparator));

echo "Loaded a total of $affectedRows records from this csv file.\n";

?>

我已经添加了REPLACE INTO TABLE，希望它能替换它，但它只是在桌面上堆叠。

知道我可能做错了吗？

谢谢！