function field($table, $field, $condition = null)
{
$execute_sql = sprintf('select %s from %s limit 0,1', $field, $table);
if ($condition) {
$condition = query::condition($condition);
$execute_sql = sprintf('select %s from %s where %s limit 0,1', $field, $table, $condition);
}
$result = $this->query($execute_sql);
$record = mysql_fetch_array($result);
if ($record && preg_match('/^[-\\+]?\\d+(\\.\\d+)?$/', $record[$field])) {
return $record[$field] + 0;
}
return isset($record[$field]) ? $record[$field] : null;
}
static function condition($condition)
{
if (is_array($condition)) {
return query::condition($condition);
}
if (preg_match('/^[0-9]*[1-9][0-9]*$/', $condition)) {
return 'id=' . $condition;
}
return $condition;
}
