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<?php
/**
* Library for extracting information about the partitions
*/
declare(strict_types=1);
namespace PhpMyAdmin\Partitioning;
use function array_values;
/**
* base Partition Class
*/
class Partition extends SubPartition
{
/** @var string partition description */
protected $description;
/** @var SubPartition[] sub partitions */
protected $subPartitions = [];
/**
* Loads data from the fetched row from information_schema.PARTITIONS
*
* @param array $row fetched row
*/
protected function loadData(array $row): void
{
$this->name = $row['PARTITION_NAME'];
$this->ordinal = $row['PARTITION_ORDINAL_POSITION'];
$this->method = $row['PARTITION_METHOD'];
$this->expression = $row['PARTITION_EXPRESSION'];
$this->description = $row['PARTITION_DESCRIPTION'];
// no sub partitions, load all data to this object
if (! empty($row['SUBPARTITION_NAME'])) {
return;
}
$this->loadCommonData($row);
}
/**
* Returns the partition description
*
* @return string partition description
*/
public function getDescription()
{
return $this->description;
}
/**
* Add a sub partition
*
* @param SubPartition $partition Sub partition
*/
public function addSubPartition(SubPartition $partition): void
{
$this->subPartitions[] = $partition;
}
/**
* Whether there are sub partitions
*/
public function hasSubPartitions(): bool
{
return ! empty($this->subPartitions);
}
/**
* Returns the number of data rows
*
* @return int number of rows
*/
public function getRows()
{
if (empty($this->subPartitions)) {
return $this->rows;
}
$rows = 0;
foreach ($this->subPartitions as $subPartition) {
$rows += $subPartition->rows;
}
return $rows;
}
/**
* Returns the total data length
*
* @return int data length
*/
public function getDataLength()
{
if (empty($this->subPartitions)) {
return $this->dataLength;
}
$dataLength = 0;
foreach ($this->subPartitions as $subPartition) {
$dataLength += $subPartition->dataLength;
}
return $dataLength;
}
/**
* Returns the total index length
*
* @return int index length
*/
public function getIndexLength()
{
if (empty($this->subPartitions)) {
return $this->indexLength;
}
$indexLength = 0;
foreach ($this->subPartitions as $subPartition) {
$indexLength += $subPartition->indexLength;
}
return $indexLength;
}
/**
* Returns the list of sub partitions
*
* @return SubPartition[]
*/
public function getSubPartitions()
{
return $this->subPartitions;
}
/**
* Returns array of partitions for a specific db/table
*
* @param string $db database name
* @param string $table table name
*
* @return Partition[]
*/
public static function getPartitions($db, $table)
{
global $dbi;
if (self::havePartitioning()) {
$result = $dbi->fetchResult(
'SELECT * FROM `information_schema`.`PARTITIONS`'
. " WHERE `TABLE_SCHEMA` = '" . $dbi->escapeString($db)
. "' AND `TABLE_NAME` = '" . $dbi->escapeString($table) . "'"
);
if ($result) {
$partitionMap = [];
/** @var array $row */
foreach ($result as $row) {
if (isset($partitionMap[$row['PARTITION_NAME']])) {
$partition = $partitionMap[$row['PARTITION_NAME']];
} else {
$partition = new Partition($row);
$partitionMap[$row['PARTITION_NAME']] = $partition;
}
if (empty($row['SUBPARTITION_NAME'])) {
continue;
}
$parentPartition = $partition;
$partition = new SubPartition($row);
$parentPartition->addSubPartition($partition);
}
return array_values($partitionMap);
}
return [];
}
return [];
}
/**
* returns array of partition names for a specific db/table
*
* @param string $db database name
* @param string $table table name
*
* @return array of partition names
*/
public static function getPartitionNames($db, $table)
{
global $dbi;
if (self::havePartitioning()) {
return $dbi->fetchResult(
'SELECT DISTINCT `PARTITION_NAME` FROM `information_schema`.`PARTITIONS`'
. " WHERE `TABLE_SCHEMA` = '" . $dbi->escapeString($db)
. "' AND `TABLE_NAME` = '" . $dbi->escapeString($table) . "'"
);
}
return [];
}
/**
* returns the partition method used by the table.
*
* @param string $db database name
* @param string $table table name
*
* @return string|null partition method
*/
public static function getPartitionMethod($db, $table)
{
global $dbi;
if (self::havePartitioning()) {
$partition_method = $dbi->fetchResult(
'SELECT `PARTITION_METHOD` FROM `information_schema`.`PARTITIONS`'
. " WHERE `TABLE_SCHEMA` = '" . $dbi->escapeString($db) . "'"
. " AND `TABLE_NAME` = '" . $dbi->escapeString($table) . "'"
. ' LIMIT 1'
);
if (! empty($partition_method)) {
return $partition_method[0];
}
}
return null;
}
/**
* checks if MySQL server supports partitioning
*
* @static
* @staticvar bool $have_partitioning
* @staticvar bool $already_checked
*/
public static function havePartitioning(): bool
{
global $dbi;
static $have_partitioning = false;
static $already_checked = false;
if (! $already_checked) {
if ($dbi->getVersion() < 50600) {
if ($dbi->fetchValue('SELECT @@have_partitioning;')) {
$have_partitioning = true;
}
} elseif ($dbi->getVersion() >= 80000) {
$have_partitioning = true;
} else {
// see https://dev.mysql.com/doc/refman/5.6/en/partitioning.html
$plugins = $dbi->fetchResult('SHOW PLUGINS');
foreach ($plugins as $value) {
if ($value['Name'] === 'partition') {
$have_partitioning = true;
break;
}
}
}
$already_checked = true;
}
return $have_partitioning;
}
}
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