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added set_count_column #94

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added set_count_column #94

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20 changes: 18 additions & 2 deletions application/libraries/Datatables.php
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ class Datatables
private $ci;
private $table;
private $distinct;
private $count_column;
private $group_by = array();
private $select = array();
private $joins = array();
Expand Down Expand Up @@ -242,6 +243,18 @@ public function unset_column($column)
return $this;
}

/**
* Sets the column used for counting improving performance
*
* @param string $column
* @return mixed
*/
public function set_count_column($column)
{
$this->count_column = $column;
return $this;
}

/**
* Builds all the necessary query segments and performs the main query based on results set from chained statements
*
Expand Down Expand Up @@ -407,6 +420,9 @@ private function get_total_results($filtering = FALSE)
if($filtering)
$this->get_filtering();

if(strlen($this->count_column) > 0)
$this->ci->db->select($this->count_column);

foreach($this->joins as $val)
$this->ci->db->join($val[0], $val[1], $val[2]);

Expand Down Expand Up @@ -604,8 +620,8 @@ private function jsonify($result = FALSE)
return '{' . join(',', $json) . '}';
}
}
/**
/**
* returns the sql statement of the last query run
* @return type
*/
Expand Down