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added function to abstract SQL union statement, needed to speed up the calendar search for MySQL 5

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This commit is contained in:
Ralf Becker 2006-03-03 12:01:10 +00:00
parent 23ea4159ef
commit 3a8c25df86
1 changed files with 49 additions and 1 deletions
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50
phpgwapi/inc/class.egw_db.inc.php
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@ -1537,7 +1537,7 @@
*/
function select($table,$cols,$where,$line,$file,$offset=False,$append='',$app=False,$num_rows=0,$join='',$table_def=False)
{
if ($this->Debug) echo "<p>db::select('$table',".print_r($cols,True).",".print_r($where,True).",$line,$file,$offset,'$app')</p>\n";
if ($this->Debug) echo "<p>db::select('$table',".print_r($cols,True).",".print_r($where,True).",$line,$file,$offset,'$app',$num_rows,'$join')</p>\n";
if (!$table_def) $table_def = $this->get_table_definitions($app,$table);
if (is_array($cols))
@ -1557,6 +1557,54 @@
if ($this->Debug) echo "<p>sql='$sql'</p>";
if ($line === false && $file === false) // call by union, to return the sql rather then run the query
{
return $sql;
}
return $this->query($sql,$line,$file,$offset,$offset===False ? -1 : (int)$num_rows);
}
/**
* Does a union over multiple selects
*
* @author RalfBecker<at>outdoor-training.de
*
* @param array $selects array of selects, each select is an array with the possible keys/parameters: table, cols, where, append, app, join, table_def
* For further info about parameters see the definition of the select function, beside table, cols and where all other params are optional
* @param int $line line-number to pass to query
* @param string $file file-name to pass to query
* @param string $order_by ORDER BY statement for the union
* @param int/bool $offset offset for a limited query or False (default)
* @param int $num_rows number of rows to return if offset set, default 0 = use default in user prefs
* @return ADORecordSet or false, if the query fails
*/
function union($selects,$line,$file,$order_by='',$offset=false,$num_rows=0)
{
if ($this->Debug) echo "<p>db::union(".print_r($selects,True).",$line,$file,$order_by,$offset,$num_rows)</p>\n";
$sql = array();
foreach($selects as $select)
{
$sql[] = call_user_func_array(array($this,'select'),array(
$select['table'],
$select['cols'],
$select['where'],
false, // line
false, // file
false, // offset
$select['append'],
$select['app'],
0, // num_rows,
$select['join'],
$select['table_def'],
));
}
$sql = count($sql) > 1 ? '(' . implode(")\nUNION\n(",$sql).')' : $sql[0];
if ($order_by) $sql .= "\nORDER BY ".$order_by;
if ($this->Debug) echo "<p>sql='$sql'</p>";
return $this->query($sql,$line,$file,$offset,$offset===False ? -1 : (int)$num_rows);
}
}