Question

我在数据库中有一个名为“favorites”的表，有3列（user_id，bookmarked_song_id，bookmark_tag），我想为当前用户获取所有Bookmarked_song_id。

 $username = $this->session->userdata('username');
 $uidq = mysql_query('SELECT user_id FROM users WHERE username="' . $username . '"');
 $rq = mysql_fetch_assoc($uidq);
 $user_id = $rq['user_id'];
 $getfavq = mysql_query("SELECT * FROM favorites WHERE user_id=$user_id");
 $favsr = mysql_fetch_array($getfavq); //contains all the information from the favorites database where user_id is the user_of the currently logged-in user

我不知道接下来要用什么...我希望有类似的东西：

foreach($favsr['bookmarked_song_id'] as $song_id) {
$getsongq = mysql_query("SELECT * FROM songs WHERE song_id=$song_id");
$getsongr = mysql_fetch_assoc($getsongq);
$singer = $getsongr['singer'];
$song_name = $getsongr['song_name'];}

显然这个方法是错误的，因为我得到：“为foreach（）提供的参数无效”。能有人帮我收听歌曲吗？提前致谢。

Answer 1

应该是这样的：

$favsr = mysql_fetch_array($getfavq, MYSQL_ASSOC);
foreach($favsr as $row) {
    $songid = $row['bookmarked_song_id'];
     ...
}

Answer 2

mysql_fetch_array只加载一行，它应该是那样的

$getfavq = mysql_query("SELECT * FROM favorites WHERE user_id=$user_id");
while $favsr = mysql_fetch_array($getfavq); 
    {$songid=$favsr['bookmarked_song_id'];
    $getsongq = mysql_query("SELECT * FROM songs WHERE song_id=$song_id");
    $getsongr = mysql_fetch_array($getsongq);
    $singer = $getsongr['singer'];
    $song_name = $getsongr['song_name'];}

Answer 3

您已将此标记为codeigniter。如果您正在构建CodeIgniter应用程序，则应该使用CI的数据库库：

$username = $this->session->userdata('username');

//Select your user
$this->db->select('user_id');
$this->db->where('username', $username);
$this->db->limit(1);
$user_query = $this->db->get('users');

if($user_query->num_rows() > 0)
{
    // We found a user
    $user = $user_query->row(); // select a single row

    // Grab this user's favorites
    $this->db->where('user_id', $user->id);
    $favorites_query = $this->db->get('favorites');

    $songs = $favorites_query->result();

    if($songs)
    {
        foreach($songs as $song)
        {
            $song_id = $song->bookmarked_song_id;
            $tag = $song->bookmark_tag;

            // Do stuff with data.
        }
    }
    else
    {
        // No songs/favorites found, catch error
    }

}
else
{
    // No such user found, catch error
}

当然，最佳做法是将您的用户数据和收藏夹数据放在不同的模型中，但这应该适用于此。

获取当前用户的所有收藏夹

3 个答案: