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using SQL union statement to speed up the calendar search for MySQL 5 (used instead of an OR)

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Ralf Becker 2006-03-03 12:03:33 +00:00
parent 3a8c25df86
commit 6eff641297
1 changed files with 25 additions and 1 deletions
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26
calendar/inc/class.socal.inc.php
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@ -328,6 +328,30 @@ class socal
if (!preg_match('/^[a-z_ ,]+$/i',$order)) $order = 'cal_start'; // gard against SQL injunktion
// changed the original OR in the query into a union, to speed up the query execution under MySQL 5
$select = array(
'table' => $this->cal_table,
'join' => "JOIN $this->dates_table USING(cal_id) JOIN $this->user_table USING(cal_id) LEFT JOIN $this->repeats_table USING(cal_id)",
'cols' => "$this->repeats_table.*,$this->cal_table.*,cal_start,cal_end,cal_recur_date",
'where' => $where,
);
$selects = array($select,$select);
$selects[0]['where'][] = 'recur_type IS NULL AND cal_recur_date=0';
$selects[1]['where'][] = 'cal_recur_date=cal_start';
if (is_numeric($offset)) // get the total too
{
// we only select cal_table.cal_id (and not cal_table.*) to be able to use DISTINCT (eg. MsSQL does not allow it for text-columns)
$selects[0]['cols'] = $selects[1]['cols'] = "DISTINCT $this->repeats_table.*,$this->cal_table.cal_id,cal_start,cal_end,cal_recur_date";
$this->db->union($selects,__LINE__,__FILE__);
$this->total = $this->db->num_rows();
$selects[0]['cols'] = $selects[1]['cols'] = $select['cols']; // restore the original cols
}
$this->db->union($selects,__LINE__,__FILE__,$order,$offset,$num_rows);
/* original query
$where[] = '(recur_type IS NULL AND cal_recur_date=0 OR cal_recur_date=cal_start)';
//_debug_array($where);
@ -344,7 +368,7 @@ class socal
"$this->repeats_table.*,$this->cal_table.*,cal_start,cal_end,cal_recur_date",
$where,__LINE__,__FILE__,$offset,'ORDER BY '.$order,false,$num_rows,
"JOIN $this->dates_table USING(cal_id) JOIN $this->user_table USING(cal_id) LEFT JOIN $this->repeats_table USING(cal_id)");
*/
$events = $ids = $recur_dates = $recur_ids = array();
while (($row =& $this->db->row(true,'cal_')))
{