Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>MySQL:</p> <pre><code>CREATE TABLE song ( song_id INT UNSIGNED NOT NULL AUTO_INCREMENT, vote INT NOT NULL DEFAULT 0, PRIMARY KEY(song_id) ); </code></pre> <p>JavaScript:</p> <pre><code>$(function() { var listContainer = $("#daily-songs"), songs = []; var songSort = function(a, b) { return +b.vote.text() - +a.vote.text(); }; var submitVote = function(song, delta) { $.post("vote.php", { id: song.node.attr("id").match(/\d+$/)[0], delta: delta, }, function(data) { if ( data != 'success' ) { alert(data); } } ); $.each(songs.sort(songSort), function() { listContainer.append(this.node); }); }; listContainer.find("li").each(function() { var $this = $(this); var song = { node: $this, vote: $this.find(".votes") }; $this.find(".vote-up").click(function() { submitVote(song, 1); }); $this.find(".vote-down").click(function() { submitVote(song, -1); }); songs.push(song); }); }); </code></pre> <p>PHP:</p> <pre><code>&lt;?php $song_id = !empty($_POST['id']) ? (int)$_POST['id'] : 0; $delta = !empty($_POST['delta']) ? (int)$_POST['delta'] : 0; if (!$song_id || !$delta || !is_int($song_id) || !is_int($delta)) { die("Invalid parameters"); } // Make sure the voting value is within the valid range. if ($delta != -1 &amp;&amp; $delta != 1) { exit("Invalid delta"); } // Check to see if user has already voted for this song session_start(); if (isset($_SESSION['voted'])) { exit("You already voted!"); } // If they haven't voted yet, connect to the database // YOU NEED TO CHANGE THIS INFOMATION TO WHATEVER APPLYS TO YOU. $dsn = 'mysql:dbname=testdb;host=127.0.0.1'; $user = 'dbuser'; $password = 'dbpass'; try { $dbh = new PDO($dsn, $user, $password); } catch (PDOException $e) { exit('Connection failed: ' . $e-&gt;getMessage()); } // If the database connection is succesful, update song entry // UPDATE daily_song SET votes=votes+$delta WHERE daily_song_id=$songId $sth = $dbh-&gt;prepare('UPDATE song SET votes = votes + :delta WHERE song_id = :song_id'); $sth-&gt;bindParam(':delta', $delta); $sth-&gt;bindParam(':song_id', $song_id); if (!$sth-&gt;execute()) { exit("Unable to update votes"); } exit("success"); </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POCan I get a little help on this php/javascript voting code?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USdmitrig01
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThanks Dmitri. Can you clarify for me: I have already created the database proposed in the first question...can we use that one in place of yours? Which values would I need to change? Thank you!
      singulars
      1. PO
      1. USJoel
    2. COBasically, I just removed and renamed a bunch of columns. You can totally keep them if you want - if so, just change the $dbh->prepare statement to this: $sth = $dbh->prepare('UPDATE daily_song SET votes = votes + :delta WHERE daily_song_id = :song_id'); and then it should work with no changes to the database
      singulars
      1. PO
      1. USdmitrig01
    3. COThank you Dmitri. I'm still getting some error, but I know it is my lack of experience here. I managed to get my accounts merged together, so I am going to close this question so we can keep everything on one page.
      singulars
      1. PO
      1. USJoel
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload