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<?php
declare(strict_types=1);
namespace Doctrine\DBAL\Driver\Mysqli;
use Doctrine\DBAL\Driver\Exception;
use Doctrine\DBAL\Driver\FetchUtils;
use Doctrine\DBAL\Driver\Mysqli\Exception\StatementError;
use Doctrine\DBAL\Driver\Result as ResultInterface;
use mysqli_sql_exception;
use mysqli_stmt;
use function array_column;
use function array_combine;
use function array_fill;
use function count;
final class Result implements ResultInterface
{
private mysqli_stmt $statement;
/**
* Whether the statement result has columns. The property should be used only after the result metadata
* has been fetched ({@see $metadataFetched}). Otherwise, the property value is undetermined.
*/
private bool $hasColumns = false;
/**
* Mapping of statement result column indexes to their names. The property should be used only
* if the statement result has columns ({@see $hasColumns}). Otherwise, the property value is undetermined.
*
* @var array<int,string>
*/
private array $columnNames = [];
/** @var mixed[] */
private array $boundValues = [];
/**
* @internal The result can be only instantiated by its driver connection or statement.
*
* @throws Exception
*/
public function __construct(mysqli_stmt $statement)
{
$this->statement = $statement;
$meta = $statement->result_metadata();
if ($meta === false) {
return;
}
$this->hasColumns = true;
$this->columnNames = array_column($meta->fetch_fields(), 'name');
$meta->free();
// Store result of every execution which has it. Otherwise it will be impossible
// to execute a new statement in case if the previous one has non-fetched rows
// @link http://dev.mysql.com/doc/refman/5.7/en/commands-out-of-sync.html
$this->statement->store_result();
// Bind row values _after_ storing the result. Otherwise, if mysqli is compiled with libmysql,
// it will have to allocate as much memory as it may be needed for the given column type
// (e.g. for a LONGBLOB column it's 4 gigabytes)
// @link https://bugs.php.net/bug.php?id=51386#1270673122
//
// Make sure that the values are bound after each execution. Otherwise, if free() has been
// previously called on the result, the values are unbound making the statement unusable.
//
// It's also important that row values are bound after _each_ call to store_result(). Otherwise,
// if mysqli is compiled with libmysql, subsequently fetched string values will get truncated
// to the length of the ones fetched during the previous execution.
$this->boundValues = array_fill(0, count($this->columnNames), null);
// The following is necessary as PHP cannot handle references to properties properly
$refs = &$this->boundValues;
if (! $this->statement->bind_result(...$refs)) {
throw StatementError::new($this->statement);
}
}
/**
* {@inheritdoc}
*/
public function fetchNumeric()
{
try {
$ret = $this->statement->fetch();
} catch (mysqli_sql_exception $e) {
throw StatementError::upcast($e);
}
if ($ret === false) {
throw StatementError::new($this->statement);
}
if ($ret === null) {
return false;
}
$values = [];
foreach ($this->boundValues as $v) {
$values[] = $v;
}
return $values;
}
/**
* {@inheritDoc}
*/
public function fetchAssociative()
{
$values = $this->fetchNumeric();
if ($values === false) {
return false;
}
return array_combine($this->columnNames, $values);
}
/**
* {@inheritdoc}
*/
public function fetchOne()
{
return FetchUtils::fetchOne($this);
}
/**
* {@inheritdoc}
*/
public function fetchAllNumeric(): array
{
return FetchUtils::fetchAllNumeric($this);
}
/**
* {@inheritdoc}
*/
public function fetchAllAssociative(): array
{
return FetchUtils::fetchAllAssociative($this);
}
/**
* {@inheritdoc}
*/
public function fetchFirstColumn(): array
{
return FetchUtils::fetchFirstColumn($this);
}
public function rowCount(): int
{
if ($this->hasColumns) {
return $this->statement->num_rows;
}
return $this->statement->affected_rows;
}
public function columnCount(): int
{
return $this->statement->field_count;
}
public function free(): void
{
$this->statement->free_result();
}
}
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