Delete row from a database using PHP

Posted: Wed Sep 13, 2006 5:54 pm

I have been trying to make clickable delete button for a table row from db. I searched the web am I missing something?

Posted: Wed Sep 13, 2006 5:57 pm

Something similar to this,
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Posted: Thu Sep 14, 2006 6:02 am

How far have you gotten? Do you have form code that you can share? What about your delete code... any sample of where you are at with it? Your question is pretty generic, so I am trying to narrow this down to what problem you are having. There are numerous examples of this throughout nuke that you could "steal".

Posted: Thu Sep 14, 2006 6:09 am

Code:

OpenTable();


echo "<table align=\"center\" width=\"100%\"><tr>";


echo "<td><strong>Games</strong></td></tr>";


echo "<tr><td><strong>Name</strong></td><td><strong>Version</strong></td><td><strong>Abbreviation</strong></td></tr>";


$result = $db->sql_query("SELECT gid, gname, version, gabbr FROM ".$prefix."_league_games ORDER by gid");


while (list($gid, $gname, $version, $gabbr)=sql_fetch_row($result)) {


echo "<tr><td>$gname</td><td>$version</td><td>$gabbr</td></tr>";}


echo "</table>";


CloseTable();

I would like to put a delete button just after $gabbr. As far as status, I am finished coding the whole admin section except for edit and delete links.

This is my first "user friendly" module just trying to get an idea of how this concept works.

Posted: Thu Sep 14, 2006 6:21 am

The key is that when the FORM is posted back to the web server (back to PHP), you need to have some way to determine what "function" to perform. In its simplest form, let us say you simply wanted a text link with the word "Delete" and a link on it. So, something like this:

Code:




<a href="modules.php?name=MyModuleName&op2=DeleteMe&itemid=9">Delete</a>

In your module's index.php script, you would check $op2 for "DeleteMe" and do the delete code within there...

Again, that is just one of many possible ways of doing this, but it should get the idea across.[/code]

Posted: Thu Sep 14, 2006 7:38 am

So basically I could make a function at the top of my index like so

Code:

function erase($gid) {


    global $prefix, $db;


    $gid = intval($gid);


    $result = $db->sql_query("delete from ".$prefix."_league_games where gid='$gid'");


}

And then call to it here

Code:

<a href=\"modules.php?name=$modulename&erase=delete&gid=$gid\">Delete</a>

I will give that a shot and see how it twerks.

Posted: Thu Sep 14, 2006 7:49 am

Well, this will not "call" the function. Seems to me that "erase" and "delete" are redundant. I was thinking that you might have something more generic like "op2" (don't use "op") and then you would need an IF statement to check what "op"eration you are needing to "call" and then, yes, you can "call" the appropriate function.

Posted: Thu Sep 14, 2006 10:02 am

Oh I give up. I've been trying to post something with a code sample for a form and an action that deletes the record selected. You can use submit buttons with values associated with them if you want a quick (and dirty) way to do buttons. Probably you would be better off with a select drop down box and populate the options in there from the table. Then have the action go to another php program and extract the value with $_POST[nameof button] and then delete the record with a where clause where the value = the value in the name of button.

I hope that's not too cryptic. I can't even post what I want on my own test site where I'm an admin and I'll just have to email it to the Sentinel group.

Posted: Thu Sep 14, 2006 11:32 am

Yeah I am kinda lost on this part, but I like that drop down box idea. It sounds like I could put my edit option in there too. If you come up with a solution or idea for me fkelly, you can always email it to me.

I am gonna try to work around this inconvience till my brain is more rested.

Posted: Thu Sep 14, 2006 6:16 pm

If you get the book PHP and MYSQL web development by Welling and Thompson (I'm looking at the second edition but there may be one after) but anyway there is a shopping cart application and they have an example of populatiing a select / options with data from a database (it's at page 551 of second edition paperback book). I used that example in a different application (module) that I wrote and it works like a charm.

I am giving up on trying to post code samples here. And they wouldn't make much sense anyway wrenched out of context.

Posted: Thu Sep 14, 2006 6:17 pm

roger that, This last part seems to be killing my mojo. I will give that shot.

Posted: Sat Sep 16, 2006 1:07 pm

I ended up making this work. Using bits and pieces of the above snipplet from [ Only registered users can see links on this board! Get registered or login! ]

Code:

$result = $db->sql_query("SELECT gid, gname, version, gabbr FROM ".$prefix."_league_games ORDER by gid");


while (list($gid, $gname, $version, $gabbr)=sql_fetch_row($result)) {


echo "<tr><td>$gabbr</td><td>$gname</td><td>$version</td>";


if(!isset($cmd)) {


echo "<td><a href='modules.php?name=$modulename&cmd=delete&gid=$gid'>Delete</a></td></tr>";


}


if($_GET["cmd"]=="delete")


{


    $result = $db->sql_query("DELETE FROM ".$prefix."_league_games WHERE gid=$gid");


    header ("Location: modules.php?name=$modulename");


}


}

It does exactly what I want it to. So for now I am satisfied.

Posted: Sun Sep 17, 2006 6:43 pm

Oh, I was just being stubborn about this. Although the code above works it does not deal with multiple rows very well. So I did a little something different that to my knowledge is working great.

Instead of trying to keep the delete action in the same document, I moved it to a new one. This is my admin index code

Code:

$result = $db->sql_query("SELECT gid, gname, version, gabbr FROM ".$prefix."_league_games ORDER by gid");


while (list($gid, $gname, $version, $gabbr)=sql_fetch_row($result)) {


echo "<tr><td>$gabbr</td><td>$gname</td><td>$version</td>";


echo "<td><a href='modules.php?name=$modulename&file=dgame&gid=$gid'>Delete</a></td></tr>";


}

This is the code for dgame.php

Code:

$gid = $_GET['gid'];


$result = $db->sql_query("DELETE from ".$prefix."_league_games WHERE gid='$gid'");


if ($result) {


   echo "<center>Game Deleted Successfully</center>";


} else {


   echo "<center>Could not delete Game</center>";


}

Anyway that seems to work perfect. Thanks for the help.