// Make sure a potentially large XML based DataSource have sufficient memory to process data
if ($res === false && $mem >= 128) {
$mem = $mem / 2;
$res = ini_set("memory_limit", $mem . "M");
if ($res === false) {
$mem = $mem / 2;
ini_set("memory_limit", $mem . "M");
}
}
}
if ($ds->GetDataSourceType() === SMDataSourceType::$Xml && in_array($command, $dsDef["XmlLockRequired"]) === true) {
$ds->Lock();
}
// Make sure two sessions do not write data at the same time, potentially causing session X to overwrite data from session Y
// Check weather item exists for Create/Retrieve/Update/Delete
$exists = $ds->Count("Id = '" . $ds->Escape($props["Id"]) . "'") > 0;
if ($command === "Create" && $exists === true) {
header("HTTP/1.1 500 Internal Server Error");
echo "Operation '" . $command . "' failed - " . $model . " item with ID '" . $props["Id"] . "' already exists";
exit;
}
if (($command === "Retrieve" || $command === "Update" || $command === "Delete") && $exists === false) {
header("HTTP/1.1 500 Internal Server Error");
echo "Operation '" . $command . "' failed - " . $model . " item with ID '" . $props["Id"] . "' could not be found";
exit;
}
// Update data source
if ($command === "Create") {
$item = new SMKeyValueCollection();
foreach ($props as $prop => $val) {
if (isset($dsDef["Fields"][$prop]["ForceInitialValue"]) === true) {
