fannie/classlib2.0/data/models/ViewModel.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 ViewModel
*/
class ViewModel extends BasicModel
{
protected $name = '__VirtualClass_ShouldNotExist';
/**
Generate SQL definition of view.
Is a method rather than property in case
any part of the query needs to be generated
based on DBMS and/or configuration values
@return [string] view definition
Note: This should be everything that
follows the "CREATE VIEW view_name AS".
Do not include that part.
*/
public function definition()
{
return 'SELECT 1 as columnName';
}
/**
Create specified view
@return [boolean]
*/
public function create()
{
if ($this->connection->isView($this->name)) {
return true;
}
$dbms = $this->connection->dbmsName();
$selectQuery = $this->definition();
$createQuery = 'CREATE VIEW '
. $this->identifierEscape($dbms, $this->name)
. ' AS '
. $selectQuery;
$try = $this->connection->query($createQuery);
return $try ? true : false;
}
/**
Deletes the view. This will drop an
existing view but will not drop an
existing table.
@return [boolean]
*/
public function delete()
{
if (!$this->connection->isView($this->name)) {
return false;
}
$try = $this->connection->query('DROP VIEW ' . $this->connection->identifierEscape($this->name));
return $try ? true : false;
}
/**
Does nothing. No meaning in context of a view.
*/
public function save()
{
return false;
}
/**
Normalize will drop a table and recreate as a view if needed
*/
public function normalize($db_name, $mode=BasicModel::NORMALIZE_MODE_CHECK, $doCreate=false)
{
// don't try to detect a db structure corresponding to
// the ViewModel class itself
if ($this->name == '__VirtualClass_ShouldNotExist') {
return 0;
}
if ($mode != BasicModel::NORMALIZE_MODE_CHECK && $mode != BasicModel::NORMALIZE_MODE_APPLY) {
echo "Error: Unknown mode ($mode)\n";
return false;
}
echo "==========================================\n";
printf("%s view %s\n",
($mode==BasicModel::NORMALIZE_MODE_CHECK)?"Checking":"Updating",
"{$db_name}.{$this->name}"
);
echo "==========================================\n";
if (!$this->currently_normalizing_lane) {
$this->connection = FannieDB::get($db_name);
}
if (!$this->connection->tableExists($this->name)) {
return $this->normalizeCreate($mode, $doCreate);
} elseif (!$this->connection->isView($this->name)) {
return $this->normalizeTableToView($mode, $doCreate);
}
return 0;
}
protected function normalizeCreate($mode, $doCreate)
{
if ($mode == BasicModel::NORMALIZE_MODE_CHECK) {
echo "View {$this->name} not found!\n";
echo "==========================================\n";
printf("%s view %s\n","Check complete. Need to create", $this->name);
echo "==========================================\n\n";
return 999;
} elseif ($mode == BasicModel::NORMALIZE_MODE_APPLY) {
echo "==========================================\n";
if ($doCreate) {
$cResult = $this->create();
printf("Update complete. Creation of view %s %s\n",$this->name, ($cResult)?"OK":"failed");
// create succeeded, normalize_lanes enabled
if ($cResult && $this->normalize_lanes && !$this->currently_normalizing_lane) {
$this->normalizeLanes($db_name, $mode, $doCreate);
}
} else {
printf("Update complete. Creation of view %s %s\n",$this->name, ($doCreate)?"OK":"not supported");
}
echo "==========================================\n\n";
return true;
}
}
protected function normalizeTableToView($mode, $doCreate)
{
if ($mode == BasicModel::NORMALIZE_MODE_CHECK) {
echo "Table {$this->name} should be a view!\n";
echo "==========================================\n";
printf("%s view %s\n","Check complete. Need to drop and re-create", $this->name);
echo "==========================================\n\n";
return 999;
} else if ($mode == BasicModel::NORMALIZE_MODE_APPLY) {
echo "==========================================\n";
if ($doCreate) {
$cResult = $this->delete();
if ($cResult) {
$cResult = $this->create();
}
printf("Update complete. Creation of view %s %s\n",$this->name, ($cResult)?"OK":"failed");
// create succeeded, normalize_lanes enabled
if ($cResult && $this->normalize_lanes && !$this->currently_normalizing_lane) {
$this->normalizeLanes($db_name, $mode, $doCreate);
}
} else {
printf("Update complete. Creation of view %s %s\n",$this->name, ($doCreate)?"OK":"not supported");
}
echo "==========================================\n\n";
return true;
}
}
/* START ACCESSOR FUNCTIONS */
/* END ACCESSOR FUNCTIONS */
}