如何获取查询结果到数组中传递的值（mySQL和PHP）

Question

I am working on a page where the user can choose which overdue invoices to download via a ZIP file. I am changing an existing query to only pull out those invoices that have been checked by the user, where the job id numbers are sent in to the PHP function via an array.

The existing query that downloads all the invoices is:

$sql = '
select i.jobid 
  from invoice i 
  join job j 
    on j.id = i.jobid 
 where i.total > 0
 ';

$Q = $this->read_db->query($sql, array($days));

$days is the number of days for which invoices are shown.

I have changed it to:

$ids = implode(',', $invids);  // $invids is the array sent in of invoice numbers
$sql = 'select `i`.`jobid` from `invoice` `i` WHERE `i`.`jobid` IN ' . $ids . ' join `job` `j` on `j`.`id` = `i`.`jobid` where `i`.`total` > 0 ';

$Q = $this->read_db->query($sql, array($days));

When I try and echo $Q->result(), I get an error Call to a member function result() on boolean . I am fairly new to mySQL, so any help would be much appreciated.

Answer 1

Your query is very strangely formatted and invalid, this is why it returned a boolean (false).

SELECT i.jobid FROM `invoice` i JOIN `job` j ON j.id = i.jobid WHERE i.total > 0

SELECT i.jobid FROM `invoice` i JOIN `job` j ON j.id = i.jobid WHERE i.total > 0 AND i.jobid IN('.$ids.')

Additionally, please always use PDO or Prepared MySQLI.

https://www.w3schools.com/php/php_mysql_prepared_statements.asp