Doctrine\DBAL\Driver\IBMDB2\DB2Statement::fetch()

Complexity

Conditions	6
Paths	6

Size

Total Lines	24
Code Lines	14

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	9
CRAP Score	9.7518

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	DB2Statement::fetchAllNumeric()	0	3	1
A	DB2Statement::fetchOne()	0	3	1

<?php

declare(strict_types=1);

namespace Doctrine\DBAL\Driver\IBMDB2;

use Doctrine\DBAL\Driver\DriverException;
use Doctrine\DBAL\Driver\FetchUtils;
use Doctrine\DBAL\Driver\Statement;
use Doctrine\DBAL\ParameterType;
use Traversable;
use function assert;
use function db2_bind_param;
use function db2_execute;
use function db2_fetch_array;
use function db2_fetch_assoc;
use function db2_free_result;
use function db2_num_fields;
use function db2_num_rows;
use function error_get_last;
use function fclose;
use function fwrite;
use function is_int;
use function is_resource;
use function ksort;
use function stream_copy_to_stream;
use function stream_get_meta_data;
use function tmpfile;
use const DB2_BINARY;
use const DB2_CHAR;
use const DB2_LONG;
use const DB2_PARAM_FILE;
use const DB2_PARAM_IN;

final class DB2Statement implements Statement
{
    /** @var resource */
    private $stmt;

    /** @var mixed[] */
    private $bindParam = [];

    /**
     * Map of LOB parameter positions to the tuples containing reference to the variable bound to the driver statement
     * and the temporary file handle bound to the underlying statement
     *
     * @var mixed[][]
     */
    private $lobs = [];

    /**
     * Indicates whether the statement is in the state when fetching results is possible
     *
     * @var bool
     */
    private $result = false;

    /**
     * @param resource $stmt
     */
    public function __construct($stmt)
    {
        $this->stmt = $stmt;
    }

    /**
     * {@inheritdoc}
     */
    public function bindValue($param, $value, int $type = ParameterType::STRING) : void
    {
        $this->bindParam($param, $value, $type);
    }

    /**
     * {@inheritdoc}
     */
    public function bindParam($param, &$variable, int $type = ParameterType::STRING, ?int $length = null) : void
    {
        assert(is_int($param));

        switch ($type) {
            case ParameterType::INTEGER:
                $this->bind($param, $variable, DB2_PARAM_IN, DB2_LONG);
                break;

            case ParameterType::LARGE_OBJECT:
                if (isset($this->lobs[$param])) {
                    [, $handle] = $this->lobs[$param];
                    fclose($handle);
                }

                $handle = $this->createTemporaryFile();
                $path   = stream_get_meta_data($handle)['uri'];

                $this->bind($param, $path, DB2_PARAM_FILE, DB2_BINARY);

                $this->lobs[$param] = [&$variable, $handle];
                break;

            default:
                $this->bind($param, $variable, DB2_PARAM_IN, DB2_CHAR);
                break;
        }
    }

    public function closeCursor() : void
    {
        $this->bindParam = [];

        if (! $this->result) {
            return;
        }

        db2_free_result($this->stmt);

        $this->result = false;
    }

    public function columnCount() : int
    {
        $count = db2_num_fields($this->stmt);

        if ($count !== false) {
            return $count;
        }

        return 0;
    }

    /**
     * {@inheritdoc}
     */
    public function execute(?array $params = null) : void
    {
        if ($params === null) {
            ksort($this->bindParam);

            $params = [];

            foreach ($this->bindParam as $column => $value) {
                $params[] = $value;
            }
        }

        foreach ($this->lobs as [$source, $target]) {
            if (is_resource($source)) {
                $this->copyStreamToStream($source, $target);

                continue;
            }

            $this->writeStringToStream($source, $target);
        }

        $retval = db2_execute($this->stmt, $params);

        foreach ($this->lobs as [, $handle]) {
            fclose($handle);
        }

        $this->lobs = [];

        if ($retval === false) {
            throw DB2Exception::fromStatementError($this->stmt);
        }

        $this->result = true;
    }

    /**
     * {@inheritDoc}
     */
    public function fetchNumeric()
    {
        if (! $this->result) {
            return false;
        }

        return db2_fetch_array($this->stmt);
    }

    /**
     * {@inheritdoc}
     */
    public function fetchAssociative()
    {
        // do not try fetching from the statement if it's not expected to contain result
        // in order to prevent exceptional situation
        if (! $this->result) {
            return false;
        }

        return db2_fetch_assoc($this->stmt);
    }

    /**
     * {@inheritdoc}
     */
    public function fetchOne()
    {
        return FetchUtils::fetchOneFromNumeric($this);
    }

    /**
     * {@inheritdoc}
     */
    public function fetchAllNumeric() : array
    {
        return FetchUtils::fetchAllNumericByOne($this);
    }

    /**
     * {@inheritdoc}
     */
    public function fetchAllAssociative() : array
    {
        return FetchUtils::fetchAllAssociativeByOne($this);
    }

    /**
     * {@inheritdoc}
     */
    public function fetchColumn() : array
    {
        return FetchUtils::fetchColumnByOne($this);
    }

    /**
     * @return Traversable<int,array<int,mixed>>
     *
     * @throws DriverException
     */
    public function iterateNumeric() : Traversable
    {
        return FetchUtils::iterateNumericByOne($this);
    }

    /**
     * @return Traversable<int,array<string,mixed>>
     *
     * @throws DriverException
     */
    public function iterateAssociative() : Traversable
    {
        return FetchUtils::iterateAssociativeByOne($this);
    }

    /**
     * @return Traversable<int,mixed>
     *
     * @throws DriverException
     */
    public function iterateColumn() : Traversable
    {
        return FetchUtils::iterateColumnByOne($this);
    }

    public function rowCount() : int
    {
        return @db2_num_rows($this->stmt);
    }

    /**
     * @param int   $position Parameter position
     * @param mixed $variable
     *
     * @throws DB2Exception
     */
    private function bind(int $position, &$variable, int $parameterType, int $dataType) : void
    {
        $this->bindParam[$position] =& $variable;

        if (! db2_bind_param($this->stmt, $position, 'variable', $parameterType, $dataType)) {
            throw DB2Exception::fromStatementError($this->stmt);
        }
    }

    /**
     * @return resource
     *
     * @throws DB2Exception
     */
    private function createTemporaryFile()
    {
        $handle = @tmpfile();

        if ($handle === false) {
            throw new DB2Exception('Could not create temporary file: ' . error_get_last()['message']);
        }

        return $handle;
    }

    /**
     * @param resource $source
     * @param resource $target
     *
     * @throws DB2Exception
     */
    private function copyStreamToStream($source, $target) : void
    {
        if (@stream_copy_to_stream($source, $target) === false) {
            throw new DB2Exception('Could not copy source stream to temporary file: ' . error_get_last()['message']);
        }
    }

    /**
     * @param resource $target
     *
     * @throws DB2Exception
     */
    private function writeStringToStream(string $string, $target) : void
    {
        if (@fwrite($target, $string) === false) {
            throw new DB2Exception('Could not write string to temporary file: ' . error_get_last()['message']);
        }
    }
}