Question

我使用oop和mysql的php有这个功能，有人可以告诉我代码中的错误是什么，我是oop的新手，

private function add_img($whichimg) {

    $query = mysql_query("SELECT max(gallery_id) as maxi FROM gallery") or die(mysql_error());
    $row = mysql_fetch_assoc($query);
    $this->maximum = $row["maxi"];

    $add_to_db = $this->query("INSERT INTO gallery (title,gallery_id) VALUES('$whichimg','$this->maximum')") or die(mysql_error());
    return $add_to_db;
}

Answer 1

错误在于：'$this->maximum'

$this->query("INSERT INTO gallery (title,gallery_id) VALUES('$whichimg','".$this->maximum."')") or die(mysql_error());

或

$this->query("INSERT INTO gallery (title,gallery_id) VALUES('$whichimg','{$this->maximum}')") or die(mysql_error());

甚至更好

$ sql = sprintf（“INSERT INTO gallery（title，gallery_id）VALUES（'％s'，'％s'）”，$ whichimg，$ this-＆gt; maximum）; $ this-＆gt; query（$ sql）或die（mysql_error（））;

如何检索最大值

1 个答案: