更新数据库中的值时 SQL 语法错误

Question

I am trying to update values in a database but only get this error. The database connects with no error, but with trying to update values it breaks. Here is a picture of the browser error and the update.php

<?php

$speed = $_GET["speed"];
$lat = $_GET["lat"];
$lng = $_GET["lng"];
$currentTime = time();

echo $speed . "<br>";
echo $lat . "<br>";
echo $lng . "<br>";

include "db_connect.php";

if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}


$sql = "UPDATE where-am-I SET time='$currentTime' WHERE id=1";

if ($conn->query($sql) === TRUE) {
  echo "Record updated successfully";
} else {
  echo "Error updating record: " . $conn->error;
}

$conn->close();
?>

Answer 1

MySQL (and MariaDB) allow only 0-9, az, AZ, $ and _ in unquoted object names. (See https://dev.mysql.com/doc/refman/8.0/en/identifiers.html ).

You can use hyphens if you wrap the name in backticks

For example

SELECT * FROM `table-name-with-hyphens`

I'd recommend you refrain from using hyphens and other special characters in your object names to avoid other possible conflicts.