查询是空的，为什么？ [关闭]

Here is my code:

<?php
    $_SETTINGS = $GLOBALS["_SETTINGS"];
    $trigger = $_SETTINGS->fields->trigger->value;
    echo $trigger . " = " . $_GET[$trigger] . "</br>";
    $townQry = "SELECT * FROM towns WHERE id = '" . $_GET[$trigger] . "'";
    echo $townQry . "</br>";
    $result = mysql_query($cityQry) or die('Could not retreive towns: ' . mysql_error());

    while ($town = mysql_fetch_assoc($result)) {
        echo $town["town_name"];
    }
?>

This is what it is echoing out:

town_id = 2
SELECT * FROM towns WHERE id = '2'
Could not retreive towns: Query was empty

Isn't the SQL valid...!?

You use $cityQry in your query, but the query is in $townQry.

$result = mysql_query($townQry) or die('Could not retreive towns: ' . mysql_error());

Additional

Your query is wide open to sql injection, I'd advice you to Google prepared statements.

You are calling the query:

mysql_query($cityQry)

But your query variable is named $townQuery.

It should be:

mysql_query($townQuery)