Questions:
I’ve seen people use this piece of code and I’m trying to understand what it does because I don’t see it in any of the codeigniter documenation or in the source code for the database class.
$this->db->ar_orderby
How to&Answers:
This is an array that holds order by columns..
There should be no reason to use this property directly. Instead call $this->db->order_by('column') which appends to the array automatically.
- defined in
system/database/DB_active_rec.phpLine 42 - appended to in method
CI_DB_active_record::order_byLine 856 - used to generate SQL in
CI_DB_active_record::_compile_selectLine 1781
Answer：
You mean
http://phpxref.com/xref/codeigniter/system/drivers/DB_active_record.php.source.html#l781
It allows you to specify the order by.
Answer：
It still makes sense to use this in the way below –
if (!count($this->db->ar_orderby)) {
$this->db->order_by($this->order_by );
}
It basically means – If an order is not already set by db library when this method was called, use this. Prevents calling of “order by” twice.
Answer：
You can replace these lines:
if (!count($this->db->ar_orderby)) {
$this->db->order_by($this->order_by );
}
with:
if(!count($this->db->order_by($this->order_by))) {
$this->db->order_by($this->order_by);
}
