MySQL SELECT同一查询中的两行或更多行

Question

I am using the below code to query an pull Category and Stock of the first 30 Product ID that are store into the $IDs array in PHP.

//Category
for ($n = 0; $n < 30; $n++) {
    $ID = $IDs[$n];
    $result = mysql_query("SELECT Category FROM Products where Code= '$ID'", $link);
    if (!$result) {
        die("Database query failed: " . mysql_error());
    }
    while ($row = mysql_fetch_array($result)) {
       $productCategory[$n] = $row["Category"];
    }
}
//Stock
for ($n = 0; $n < 30; $n++) {
    $ID = $IDs[$n];
    $result = mysql_query("SELECT Stock FROM Products where Code= '$ID'", $link);
    if (!$result) {
        die("Database query failed: " . mysql_error());
    }
    while ($row = mysql_fetch_array($result)) {
       $productStock[$n] = $row["Stock"];
    }
}

Is there a way to query and pull both Category and Stock with the same SELECT so i can minimise the queries to mySQL DB to only 30 not 60?

Answer 1

SELECT Stock, Category FROM Products WHERE Code= '$ID'

Please note that the mysql_* methods have been deprecated in PHP due to their vulnerability to SQL injection. You should use either PDO or mysqli functions.