/**
* Query for n random submit times if 'random' option is set indicting number of random
* values to return (n)
* @param $formName
* @return array|null array of n submit_times or null if not applicable
*/
protected function queryRandomSubmitTimes($formName)
{
$submitTimes = null;
if (isset($this->options['random'])) {
$numRandom = intval($this->options['random']);
if ($numRandom > 0) {
// Digression: query for n unique random submit_time values
$justSubmitTimes = new ExportBase();
$justSubmitTimes->setOptions($this->options);
$justSubmitTimes->setCommonOptions();
unset($justSubmitTimes->options['random']);
$justSubmitTimes->showColumns = array('submit_time');
$jstSql = $justSubmitTimes->getPivotQuery($formName);
$justSubmitTimes->setDataIterator($formName, 'submit_time');
$justSubmitTimes->dataIterator->query($jstSql, $justSubmitTimes->rowFilter);
$allSubmitTimes = null;
while ($justSubmitTimes->dataIterator->nextRow()) {
$allSubmitTimes[] = $justSubmitTimes->dataIterator->row['submit_time'];
}
if (!empty($allSubmitTimes)) {
if (count($allSubmitTimes) < $numRandom) {
$submitTimes = $allSubmitTimes;
return $submitTimes;
} else {
shuffle($allSubmitTimes);
// randomize
$submitTimes = array_slice($allSubmitTimes, 0, $numRandom);
return $submitTimes;
}
}
return $submitTimes;
}
return $submitTimes;
}
return $submitTimes;
}
/**
* Execute the query and set up the results iterator
* @param string|array $formName (if array, must be array of string)
* @param null|string $submitTimeKeyName
* @return void
*/
protected function setDataIterator($formName, $submitTimeKeyName = null)
{
$submitTimes = null;
if (isset($this->options['random'])) {
$numRandom = intval($this->options['random']);
if ($numRandom > 0) {
// Digression: query for n unique random submit_time values
$justSubmitTimes = new ExportBase();
$justSubmitTimes->setOptions($this->options);
$justSubmitTimes->setCommonOptions();
unset($justSubmitTimes->options['random']);
$justSubmitTimes->showColumns = array('submit_time');
$jstSql = $justSubmitTimes->getPivotQuery($formName);
$justSubmitTimes->setDataIterator($formName, 'submit_time');
$justSubmitTimes->dataIterator->query($jstSql, $justSubmitTimes->rowFilter);
$allSubmitTimes = null;
while ($justSubmitTimes->dataIterator->nextRow()) {
$allSubmitTimes[] = $justSubmitTimes->dataIterator->row['submit_time'];
}
if (!empty($allSubmitTimes)) {
if (count($allSubmitTimes) < $numRandom) {
$submitTimes = $allSubmitTimes;
} else {
shuffle($allSubmitTimes);
// randomize
$submitTimes = array_slice($allSubmitTimes, 0, $numRandom);
}
}
}
}
$sql = $this->getPivotQuery($formName, false, $submitTimes);
$this->dataIterator = new CFDBQueryResultIterator();
// $this->dataIterator->fileColumns = $this->getFileMetaData($formName);
$queryOptions = array();
if ($submitTimeKeyName) {
$queryOptions['submitTimeKeyName'] = $submitTimeKeyName;
}
if (!empty($this->rowFilter) && isset($this->options['limit'])) {
// have data iterator apply the limit if it is not already
// being applied in SQL directly, which we do when there are
// no filter constraints.
$queryOptions['limit'] = $this->options['limit'];
}
if (isset($this->options['unbuffered'])) {
$queryOptions['unbuffered'] = $this->options['unbuffered'];
}
$this->dataIterator->query($sql, $this->rowFilter, $queryOptions);
$this->dataIterator->displayColumns = $this->getColumnsToDisplay($this->dataIterator->columns);
}