Database field to MySQL Query - php

Question

I'm looking for a way to use a field in a database as a query. This is what I have:
Column Title: banemail
The contents of this field is updated using the vBulletin Settings page. It stores the email addresses I want to ban from registering. I need a query that will delete all users who are already registered and use a banned email. I want to retrieve the contents from the table, then use it a query of my own.
Query so far:
$datastoreemails = $vbulletin->db->query_read("SELECT data FROM ".TABLE_PREFIX."datastore WHERE title = 'banemail'");
while($content = $vbulletin->db->fetch_array($datastoreemails))
{
echo $content['data']."<br />";
}
This output is:
.cc .co hotmail
How can I then turn this output into a query to delete anyone in the database that has an email address containg the above?
This works when I run it manually but I have 20-30 banned email address and I would like to do it all in 1 query if possible.
DELETE FROM TABLE_PREFIX_user WHERE email LIKE '%.com%';
TIA

Answer 1

I've never used vbulletin so you may need ot adjust the below. I didn't know what the users table was for examples so I just entered "users".
$datastoreemails = $vbulletin->db->query_read("SELECT data FROM ".TABLE_PREFIX."datastore WHERE title = 'banemail'");
//Create an array of banned emails.
$bannedEmails = [];
while($content = $vbulletin->db->fetch_array($datastoreemails))
{
//Explode your data by a space to return an array of items you are looking for
$bannedEmails = array_merge($bannedEmails, explode(" ", $content['data']));
}
//check if there is anything in the banned Emails, if so build your "delete" query
if(is_array($bannedEmails) && count($bannedEmails) > 0) :
$deleteQuery = "DELETE FROM ".TABLE_PREFIX."users WHERE";
$deleteWhere = "";
//Loop through the array adding each email stub in to the query
foreach($bannedEmails as $email):
//If this is the second time through the loop add the AND clause
if($deleteWhere != "") $deleteWhere .= "OR ";
//Add in where email like %hotmail.com% to match anything that looks like it.
$deleteWhere .= " email like '%" .$email . "%' ";
endforeach;
//Add the where on the end of the query
$deleteQuery .= $deleteWhere;
//Now all you need to do is execute the delete, I'm just going to print it out so you can check the
//sql first!
echo $deleteQuery;
endif;
From your code it looks like there is a single text field which will hold the banned email addresses in your database. If that is the case then you might want to use "query_first" like this $vbulletin->db->query_first($query) as that will just pull one row out, and you won't have to loop through the results. I've written the code above in case there are multiple rows with banned emails in, which should work even if there is just one.

Answer 2

you could use the reult of select fro delete directly
assuming you have
SELECT data FROM ".TABLE_PREFIX."datastore WHERE title = 'banemail'"
then you could
("DELETE
FROM " .TABLE_PREFIX ."user
WHERE email in ( SELECT data
FROM " .TABLE_PREFIX."datastore
WHERE title = 'banemail'" );