fannie/classlib2.0/data/models/arch/BigArchiveModel.php
<?php
/*******************************************************************************
Copyright 2014 Whole Foods Co-op
This file is part of CORE-POS.
IT CORE is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
IT CORE is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
in the file license.txt along with IT CORE; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*********************************************************************************/
/**
@class BigArchiveModel
*/
class BigArchiveModel extends DTransactionsModel
{
protected $name = "bigArchive";
protected $preferred_db = 'arch';
public function __construct($con)
{
$this->columns['store_row_id']['increment'] = false;
$this->columns['store_row_id']['primary_key'] = false;
$this->columns['store_row_id']['index'] = false;
parent::__construct($con);
}
/**
Use DTransactionsModel to normalize same-schema tables
*/
public function normalize($db_name, $mode=BasicModel::NORMALIZE_MODE_CHECK, $doCreate=false)
{
return 0;
}
/**
Override BasicModel::create to add an
initial partition when the table is first
created
*/
public function create()
{
$exists = $this->connection->tableExists($this->name);
$created = parent::create();
if ($created && !$exists) {
$this->initPartitions(date('Y'), date('n'));
}
return $created;
}
/**
Initialize monthly paritioning for the table
@param $year [int] year
@param $month [int] month
@return [boolean] success
*/
public function initPartitions($year, $month)
{
$timestamp = mktime(0, 0, 0, $month, 1, $year);
$next_month = date('Y-m-d', mktime(
0, 0, 0,
date('n', $timestamp)+1,
1,
date('Y', $timestamp)
));
$dbms = $this->connection->dbmsName();
if (strstr($dbms, 'mysql')) {
return $this->initMysqlPartitions($timestamp, $next_month);
} elseif ($dbms === 'postgres9') {
return $this->initPostgresPartitions($timestamp, $year, $month);
}
return false;
}
private function initMysqlPartitions($timestamp, $next_month)
{
$partition_name = 'p' . date('Ym', $timestamp);
$partitionQ = "
ALTER TABLE " . $this->connection->identifierEscape($this->name) . "
PARTITION BY RANGE(TO_DAYS(" . $this->connection->identifierEscape('datetime') . "))
(PARTITION {$partition_name}
VALUES LESS THAN (TO_DAYS('{$next_month}'))
)";
$added = $this->connection->query($partitionQ);
return ($added) ? true : false;
}
private function initPostgresPartitions($timestamp, $year, $month)
{
$partition_name = 'bigArchive' . date('Ym', $timestamp);
$start = date('Y-m-01', $timestamp);
$end = date('Y-m-t', $timestamp);
$partitionQ = "
CREATE TABLE {$partition_name}
(CHECK (datetime >= '{$start}' AND datetime <= '{$end}'))
INHERITS (bigArchive)";
$added = $this->connection->query($partitionQ);
$this->connection->query("CREATE INDEX datetime_idx ON {$partition_name} (datetime)");
$this->connection->query($this->generateTrigger($year, $month, $year, $month));
$this->connection->query("
CREATE TRIGGER bigarchive_insert
BEFORE INSERT ON bigArchive
FOR EACH ROW EXECUTE PROCEDURE bigarchive_input_mapper();
");
$added = $this->connection->query($partitionQ);
return ($added) ? true : false;
}
/**
Generate postgres trigger function to insert records into appropriate
partitions between the given dates
*/
private function generateTrigger($startYear, $startMonth, $endYear, $endMonth)
{
$trigger = "
CREATE OR REPLACE FUNCTION bigarchive_input_mapper()
RETURNS TRIGGER AS \$\$
BEGIN ";
while ($startYear < $endYear || ($startYear == $endYear && $startMonth <= $endMonth)) {
$timestamp = mktime(0,0,0, $startMonth, 1, $startYear);
$start = date('Y-m-01', $timestamp);
$end = date('Y-m-t', $timestamp);
$partition_name = 'bigArchive' . date('Ym', $timestamp);
$trigger .= " IF (NEW.datetime >= '{$start}' AND NEW.datetime <= '{$end}') THEN
INSERT INTO {$partition_name} VALUES (NEW.*);\n";
$startMonth++;
if ($startMonth > 12) {
$startYear++;
$startMonth = 1;
}
}
$trigger .= "
ELSE
RAISE EXCEPTION 'Date out of range';
END IF;
RETURN NULL;
END;
\$\$
LANGUAGE plpgsql;";
return $trigger;
}
/**
Add a partition to the table
@param $year [int] year
@param $month [int] month
@return [boolean] success
*/
public function addPartition($year, $month)
{
$timestamp = mktime(0, 0, 0, $month, 1, $year);
$next_month = date('Y-m-d', mktime(
0, 0, 0,
date('n', $timestamp)+1,
1,
date('Y', $timestamp)
));
$dbms = $this->connection->dbmsName();
if (strstr($dbms, 'mysql')) {
return $this->addMysqlPartition($timestamp, $next_month);
} elseif ($dbms === 'postgres9') {
return $this->addPostgresPartition($timestamp, $year, $month);
}
return false;
}
private function addMysqlPartition($timestamp, $next_month)
{
$partition_name = 'p' . date('Ym', $timestamp);
$partitionQ = "
ALTER TABLE " . $this->connection->identifierEscape($this->name) . "
ADD PARTITION
(PARTITION {$partition_name}
VALUES LESS THAN (TO_DAYS('{$next_month}'))
)";
$added = $this->connection->query($partitionQ);
return ($added) ? true : false;
}
private function addPostgresPartition($timestamp, $year, $month)
{
$partition_name = 'bigArchive' . date('Ym', $timestamp);
$start = date('Y-m-01', $timestamp);
$end = date('Y-m-t', $timestamp);
// create new partition table
$partitionQ = "
CREATE TABLE {$partition_name}
(CHECK (datetime >= '{$start}' AND datetime <= '{$end}'))
INHERITS (bigArchive)";
$added = $this->connection->query($partitionQ);
// ensure indexing
$this->connection->query("CREATE INDEX datetime_idx ON {$partition_name} (datetime)");
// lookup minimum date to see where partitioning starts
$minP = $this->connection->prepare("SELECT MIN(datetime) FROM bigArchive");
$min = $this->connection->getValue($minP);
$startTS = strtotime($min);
$startYear = date('Y', $startTS);
$startMonth = date('n', $startTS);
// regenerate the partition function for the full date range
$this->connection->query($this->generateTrigger($startYear, $startMonth, $year, $month));
return ($added) ? true : false;
}
public function doc()
{
return '
Use:
Long-term transaction storage. Uses same schema as other transaction
tables but is partitioned by month.
';
}
}