if (isset($this->options['field'])) {
unset($this->options['field']);
}
$pdo = $this->field($field)->limit(1)->getPdo();
if (is_string($pdo)) {
// 返回SQL语句
return $pdo;
}
$result = $pdo->fetchColumn();
if ($force) {
$result = (float) $result;
}
if (isset($cache) && false !== $result) {
// 缓存数据
$this->cacheData($key, $result, $cache);
}
} else {