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<?php
namespace Bitrix\Perfmon\Sql;
class Compare
{
private $difference = [];
/**
* Compares two database schemas and returns array of pairs.
* <p>
* Pair is the two element array:
* - First element with index "0" is the object from the source collection.
* - Second element with index "1" is the object from $targetList.
* - if pair element is null when no such element found (by name) in the collection.
*
* @param Schema $source Source schema.
* @param Schema $target Target schema.
*
* @return array
*/
public static function diff(Schema $source, Schema $target)
{
$compare = new Compare;
$compare->compareSequences($source, $target);
$compare->compareProcedures($source, $target);
$compare->compareTables($source, $target);
return $compare->difference;
}
/**
* Compares sequences.
*
* @param Schema $source Source schema.
* @param Schema $target Target schema.
*
* @return void
*/
private function compareSequences(Schema $source, Schema $target)
{
foreach ($source->sequences->compare($target->sequences) as $pair)
{
$this->difference[] = $pair;
}
}
/**
* Compares procedures.
*
* @param Schema $source Source schema.
* @param Schema $target Target schema.
*
* @return void
*/
private function compareProcedures(Schema $source, Schema $target)
{
foreach ($source->procedures->compare($target->procedures) as $pair)
{
$this->difference[] = $pair;
}
}
/**
* Compares tables.
*
* @param Schema $source Source schema.
* @param Schema $target Target schema.
*
* @return void
*/
private function compareTables(Schema $source, Schema $target)
{
foreach ($source->tables->compare($target->tables, false) as $pair)
{
if (isset($pair[0]) && isset($pair[1]))
{
$this->compareTable($pair[0], $pair[1]);
}
elseif (!isset($pair[0]) && isset($pair[1])) //Table created
{
$this->difference[] = $pair;
$emptyCollection = new Collection;
foreach ($emptyCollection->compare($pair[1]->triggers) as $pair2)
{
$this->difference[] = $pair2;
}
}
else
{
$this->difference[] = $pair;
}
}
}
/**
* Compares tables columns, indexes, constraints, and triggers..
*
* @param Table $source Source table.
* @param Table $target Target table.
*
* @return void
*/
private function compareTable(Table $source, Table $target)
{
foreach ($source->columns->compare($target->columns) as $pair)
{
if (isset($pair[0]) && isset($pair[1]))
{
$this->compareColumn($pair[0], $pair[1]);
}
else
{
$this->difference[] = $pair;
}
}
foreach ($source->indexes->compare($target->indexes) as $pair)
{
$this->difference[] = $pair;
}
foreach ($source->constraints->compare($target->constraints) as $pair)
{
$this->difference[] = $pair;
}
foreach ($source->triggers->compare($target->triggers) as $pair)
{
$this->difference[] = $pair;
}
}
/**
* Compares columns
*
* @param Column $source Source column.
* @param Column $target Target column.
*
* @return void
*/
private function compareColumn(Column $source, Column $target)
{
if (
$source->type !== $target->type
|| $source->unsigned !== $target->unsigned
|| $source->length !== $target->length
|| $source->nullable !== $target->nullable
|| $source->default !== $target->default
)
{
$this->difference[] = [$source, $target];
}
}
}