';
try {
// Fetch num and slatlist columns from the output table
$output_sql = "SELECT num, slatlist FROM chandj.output";
$output_stmt = $pdo->prepare($output_sql);
$output_stmt->execute();
$output_results = $output_stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($output_results as $output_row) {
$output_num = $output_row['num'];
$slatlist_data = json_decode($output_row['slatlist'], true);
$total_slat_m2 = 0;
// Loop through each item in slatlist to calculate the total area
if (is_array($slatlist_data)) {
foreach ($slatlist_data as $item) {
$cutwidth = trim($item['cutwidth']);
$cutheight = trim($item['cutheight']);
$number = trim($item['number']);
// Calculate the area in square meters for each item
$item_m2 = ($cutwidth / 1000) * ($cutheight / 1000) * $number;
$total_slat_m2 += $item_m2; // Sum up all areas
}
}
// Update the output table with the calculated slat_m2
$update_sql = "UPDATE chandj.output SET slat_m2 = :slat_m2 WHERE num = :num";
$update_stmt = $pdo->prepare($update_sql);
$update_stmt->bindParam(':slat_m2', $total_slat_m2, PDO::PARAM_STR);
$update_stmt->bindParam(':num', $output_num, PDO::PARAM_INT);
if (!$update_stmt->execute()) {
echo "Error updating record num $output_num: " . implode(", ", $update_stmt->errorInfo()) . "
";
} else {
echo "Record num $output_num updated successfully. slat_m2: $total_slat_m2
";
}
}
echo "All records processed.";
} catch (PDOException $e) {
echo "Error: " . $e->getMessage();
}
?>