Doctrine\DBAL\Driver\Mysqli\MysqliStatement

Complexity

Total Complexity

60

Size/Duplication

Total Lines	403
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	2

Test Coverage

Coverage

89.8%

Importance

Changes

0

16 Methods

Rating	Name	Duplication	Size	Complexity
A	bindUntypedValues()	0	11	2
A	_fetch()	0	15	3
A	__construct()	0	20	3
A	bindParam()	0	11	2
A	bindValue()	0	12	2
C	execute()	0	64	11
B	bindTypedParameters()	0	32	8
A	sendLongData()	0	16	5
B	fetch()	0	46	10
A	fetchAll()	0	18	5
A	fetchColumn()	0	14	3
A	closeCursor()	0	5	1
A	rowCount()	0	8	2
A	columnCount()	0	4	1
A	setFetchMode()	0	4	1
A	getIterator()	0	4	1

<?php

declare(strict_types=1);

namespace Doctrine\DBAL\Driver\Mysqli;

use Doctrine\DBAL\Driver\DriverException;
use Doctrine\DBAL\Driver\Mysqli\Exception\ConnectionError;
use Doctrine\DBAL\Driver\Mysqli\Exception\FailedReadingStreamOffset;
use Doctrine\DBAL\Driver\Mysqli\Exception\StatementError;
use Doctrine\DBAL\Driver\Mysqli\Exception\UnknownFetchMode;
use Doctrine\DBAL\Driver\Mysqli\Exception\UnknownType;
use Doctrine\DBAL\Driver\Statement;
use Doctrine\DBAL\Driver\StatementIterator;
use Doctrine\DBAL\Exception\InvalidArgumentException;
use Doctrine\DBAL\Exception\InvalidColumnIndex;
use Doctrine\DBAL\FetchMode;
use Doctrine\DBAL\ParameterType;
use IteratorAggregate;
use mysqli;
use mysqli_stmt;
use function array_combine;
use function array_fill;
use function array_key_exists;
use function assert;
use function count;
use function feof;
use function fread;
use function get_resource_type;
use function is_array;
use function is_int;
use function is_resource;
use function str_repeat;

class MysqliStatement implements IteratorAggregate, Statement
{
    /** @var string[] */
    protected static $_paramTypeMap = [
        ParameterType::STRING       => 's',
        ParameterType::BINARY       => 's',
        ParameterType::BOOLEAN      => 'i',
        ParameterType::NULL         => 's',
        ParameterType::INTEGER      => 'i',
        ParameterType::LARGE_OBJECT => 'b',
    ];

    /** @var mysqli */
    protected $_conn;

    /** @var mysqli_stmt */
    protected $_stmt;

    /** @var string[]|false|null */
    protected $_columnNames;

    /** @var mixed[] */
    protected $_rowBindedValues = [];

    /** @var mixed[] */
    protected $_bindedValues = [];

    /** @var string */
    protected $types;

    /**
     * Contains ref values for bindValue().
     *
     * @var mixed[]
     */
    protected $_values = [];

    /** @var int */
    protected $_defaultFetchMode = FetchMode::MIXED;

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

    /**
     * @throws MysqliException
     */
    public function __construct(mysqli $conn, string $sql)
    {
        $this->_conn = $conn;

        $stmt = $conn->prepare($sql);

        if ($stmt === false) {
            throw ConnectionError::new($this->_conn);
        }

        $this->_stmt = $stmt;

        $paramCount = $this->_stmt->param_count;
        if (0 >= $paramCount) {
            return;
        }

        $this->types         = str_repeat('s', $paramCount);
        $this->_bindedValues = array_fill(1, $paramCount, null);
    }

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

        if (! isset(self::$_paramTypeMap[$type])) {
            throw UnknownType::new($type);
        }

        $this->_bindedValues[$param] =& $variable;
        $this->types[$param - 1]     = self::$_paramTypeMap[$type];
    }

    /**
     * {@inheritdoc}
     */
    public function bindValue($param, $value, int $type = ParameterType::STRING) : void
    {
        assert(is_int($param));

        if (! isset(self::$_paramTypeMap[$type])) {
            throw UnknownType::new($type);
        }

        $this->_values[$param]       = $value;
        $this->_bindedValues[$param] =& $this->_values[$param];
        $this->types[$param - 1]     = self::$_paramTypeMap[$type];
    }

    /**
     * {@inheritdoc}
     */
    public function execute(?array $params = null) : void
    {
        if ($params !== null && count($params) > 0) {
            if (! $this->bindUntypedValues($params)) {
                throw StatementError::new($this->_stmt);
            }
        } else {
            $this->bindTypedParameters();
        }

        if (! $this->_stmt->execute()) {
            throw StatementError::new($this->_stmt);
        }

        if ($this->_columnNames === null) {
            $meta = $this->_stmt->result_metadata();
            if ($meta !== false) {
                $fields = $meta->fetch_fields();
                assert(is_array($fields));

                $columnNames = [];
                foreach ($fields as $col) {
                    $columnNames[] = $col->name;
                }

                $meta->free();

                $this->_columnNames = $columnNames;
            } else {
                $this->_columnNames = false;
            }
        }

        if ($this->_columnNames !== false) {
            // 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->_stmt->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 field 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 closeCursor() has been
            // previously called on the statement, 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.
            $this->_rowBindedValues = array_fill(0, count($this->_columnNames), null);

            $refs = [];
            foreach ($this->_rowBindedValues as $key => &$value) {
                $refs[$key] =& $value;
            }

            if (! $this->_stmt->bind_result(...$refs)) {
                throw StatementError::new($this->_stmt);
            }
        }

        $this->result = true;
    }

    /**
     * Binds parameters with known types previously bound to the statement
     *
     * @throws DriverException
     */
    private function bindTypedParameters() : void
    {
        $streams = $values = [];
        $types   = $this->types;

        foreach ($this->_bindedValues as $parameter => $value) {
            if (! isset($types[$parameter - 1])) {
                $types[$parameter - 1] = static::$_paramTypeMap[ParameterType::STRING];
            }

            if ($types[$parameter - 1] === static::$_paramTypeMap[ParameterType::LARGE_OBJECT]) {
                if (is_resource($value)) {
                    if (get_resource_type($value) !== 'stream') {
                        throw new InvalidArgumentException('Resources passed with the LARGE_OBJECT parameter type must be stream resources.');
                    }
                    $streams[$parameter] = $value;
                    $values[$parameter]  = null;
                    continue;
                }

                $types[$parameter - 1] = static::$_paramTypeMap[ParameterType::STRING];
            }

            $values[$parameter] = $value;
        }

        if (count($values) > 0 && ! $this->_stmt->bind_param($types, ...$values)) {
            throw StatementError::new($this->_stmt);
        }

        $this->sendLongData($streams);
    }

    /**
     * Handle $this->_longData after regular query parameters have been bound
     *
     * @param resource[] $streams
     *
     * @throws MysqliException
     */
    private function sendLongData(array $streams) : void
    {
        foreach ($streams as $paramNr => $stream) {
            while (! feof($stream)) {
                $chunk = fread($stream, 8192);

                if ($chunk === false) {
                    throw FailedReadingStreamOffset::new($paramNr);
                }

                if (! $this->_stmt->send_long_data($paramNr - 1, $chunk)) {
                    throw StatementError::new($this->_stmt);
                }
            }
        }
    }

    /**
     * Binds a array of values to bound parameters.
     *
     * @param mixed[] $values
     */
    private function bindUntypedValues(array $values) : bool
    {
        $params = [];
        $types  = str_repeat('s', count($values));

        foreach ($values as &$v) {
            $params[] =& $v;
        }

        return $this->_stmt->bind_param($types, ...$params);
    }

    /**
     * @return mixed[]|false|null
     */
    private function _fetch()
    {
        $ret = $this->_stmt->fetch();

        if ($ret === true) {
            $values = [];
            foreach ($this->_rowBindedValues as $v) {
                $values[] = $v;
            }

            return $values;
        }

        return $ret;
    }

    /**
     * {@inheritdoc}
     */
    public function fetch(?int $fetchMode = null, ...$args)
    {
        // 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;
        }

        $fetchMode = $fetchMode ?: $this->_defaultFetchMode;

        if ($fetchMode === FetchMode::COLUMN) {
            return $this->fetchColumn();
        }

        $values = $this->_fetch();

        if ($values === null) {
            return false;
        }

        if ($values === false) {
            throw StatementError::new($this->_stmt);
        }

        if ($fetchMode === FetchMode::NUMERIC) {
            return $values;
        }

        assert(is_array($this->_columnNames));
        $assoc = array_combine($this->_columnNames, $values);
        assert(is_array($assoc));

        switch ($fetchMode) {
            case FetchMode::ASSOCIATIVE:
                return $assoc;

            case FetchMode::MIXED:
                return $assoc + $values;

            case FetchMode::STANDARD_OBJECT:
                return (object) $assoc;

            default:
                throw UnknownFetchMode::new($fetchMode);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function fetchAll(?int $fetchMode = null, ...$args) : array
    {
        $fetchMode = $fetchMode ?: $this->_defaultFetchMode;

        $rows = [];

        if ($fetchMode === FetchMode::COLUMN) {
            while (($row = $this->fetchColumn()) !== false) {
                $rows[] = $row;
            }
        } else {
            while (($row = $this->fetch($fetchMode)) !== false) {
                $rows[] = $row;
            }
        }

        return $rows;
    }

    /**
     * {@inheritdoc}
     */
    public function fetchColumn(int $columnIndex = 0)
    {
        $row = $this->fetch(FetchMode::NUMERIC);

        if ($row === false) {
            return false;
        }

        if (! array_key_exists($columnIndex, $row)) {
            throw InvalidColumnIndex::new($columnIndex, count($row));
        }

        return $row[$columnIndex];
    }

    /**
     * {@inheritdoc}
     */
    public function closeCursor() : void
    {
        $this->_stmt->free_result();
        $this->result = false;
    }

    /**
     * {@inheritdoc}
     */
    public function rowCount() : int
    {
        if ($this->_columnNames === false) {
            return $this->_stmt->affected_rows;
        }

        return $this->_stmt->num_rows;
    }

    /**
     * {@inheritdoc}
     */
    public function columnCount() : int
    {
        return $this->_stmt->field_count;
    }

    /**
     * {@inheritdoc}
     */
    public function setFetchMode(int $fetchMode, ...$args) : void
    {
        $this->_defaultFetchMode = $fetchMode;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator()
    {
        return new StatementIterator($this);
    }
}