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    The mysqli class

    (PHP 5, PHP 7, PHP 8)

    Introduction

    Represents a connection between PHP and a MySQL database.

    Class synopsis

    class mysqli {
    /* Properties */
    public readonly int|string $affected_rows;
    public readonly string $client_info;
    public readonly int $client_version;
    public readonly int $connect_errno;
    public readonly ?string $connect_error;
    public readonly int $errno;
    public readonly string $error;
    public readonly array $error_list;
    public readonly int $field_count;
    public readonly string $host_info;
    public readonly ?string $info;
    public readonly int|string $insert_id;
    public readonly string $server_info;
    public readonly int $server_version;
    public readonly string $sqlstate;
    public readonly int $protocol_version;
    public readonly int $thread_id;
    public readonly int $warning_count;
    /* Methods */
    public __construct(
        ?string $hostname = null,
        ?string $username = null,
        ?string $password = null,
        ?string $database = null,
        ?int $port = null,
        ?string $socket = null
    )
    public autocommit(bool $enable): bool
    public begin_transaction(int $flags = 0, ?string $name = null): bool
    public change_user(string $username, string $password, ?string $database): bool
    public character_set_name(): string
    public close(): true
    public commit(int $flags = 0, ?string $name = null): bool
    public connect(
        ?string $hostname = null,
        ?string $username = null,
        ?string $password = null,
        ?string $database = null,
        ?int $port = null,
        ?string $socket = null
    ): bool
    public debug(string $options): true
    public dump_debug_info(): bool
    public execute_query(string $query, ?array $params = null): mysqli_result|bool
    public get_charset(): ?object
    public get_client_info(): string
    public get_connection_stats(): array
    public get_server_info(): string
    public get_warnings(): mysqli_warning|false
    public init(): ?bool
    public kill(int $process_id): bool
    public more_results(): bool
    public multi_query(string $query): bool
    public next_result(): bool
    public options(int $option, string|int $value): bool
    public ping(): bool
    public static poll(
        ?array &$read,
        ?array &$error,
        array &$reject,
        int $seconds,
        int $microseconds = 0
    ): int|false
    public prepare(string $query): mysqli_stmt|false
    public query(string $query, int $result_mode = MYSQLI_STORE_RESULT): mysqli_result|bool
    public real_connect(
        ?string $hostname = null,
        ?string $username = null,
        ?string $password = null,
        ?string $database = null,
        ?int $port = null,
        ?string $socket = null,
        int $flags = 0
    ): bool
    public real_escape_string(string $string): string
    public real_query(string $query): bool
    public reap_async_query(): mysqli_result|bool
    public refresh(int $flags): bool
    public release_savepoint(string $name): bool
    public rollback(int $flags = 0, ?string $name = null): bool
    public savepoint(string $name): bool
    public select_db(string $database): bool
    public set_charset(string $charset): bool
    public ssl_set(
        ?string $key,
        ?string $certificate,
        ?string $ca_certificate,
        ?string $ca_path,
        ?string $cipher_algos
    ): true
    public stat(): string|false
    public stmt_init(): mysqli_stmt|false
    public store_result(int $mode = 0): mysqli_result|false
    public thread_safe(): bool
    public use_result(): mysqli_result|false
    }

    Table of Contents

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    User Contributed Notes 2 notes

    up
    1
    user at note dot com
    4 years ago
    <?php

    class Database{

        protected     $url;
        protected     $user;
        protected     $password;
        protected     $db;
        protected     $connection = null;

        public function     __construct($url, $user, $password, $db)
        {
                $this->url = $url;
                $this->user = $user;
                $this->password = $password;
                $this->db = $db;
        }
        public function     __destruct()
        {
            if(    $this->connection != null){
                    $this->closeConnection();
            }
        }
        protected function     makeConnection(){

                $this->connection = new mysqli($this->url, $this->user, $this->password, $this->db);
            if(    $this->connection->connect_error){
                echo     "Fail" . $this->connection->connect_error;
            }
        }
        protected function     closeConnection(){
            if(    $this->connection != null){
                    $this->connection->close();
                    $this->connection = null;
            }
        }
        public function     executeQuery($query, $params = null){
                // Is there a DB connection?
                $this->makeConnection();
                // Adjust query with params if available
                if($params != null){
                    // Change ? to values from parameter array
                    $queryParts = preg_split("/\?/", $query);
                    // if amount of ? is not equal to amount of values => error
                    if(count($queryParts) != count($params) + 1){
                    return     false;
                }
                    // Add first part
                    $finalQuery = $queryParts[0];
                    // Loop over all parameters
                    for($i = 0; $i < count($params); $i++){
                        // Add clean parameter to query
                        $finalQuery = $finalQuery . $this->cleanParameters($params[$i]) . $queryParts[$i + 1];
                }
                    $query = $finalQuery;
            }
                // Check for SQL injection

                $result = $this->connection->query($query);
            return     $result;
        }
        protected function     cleanParameters($parameters){
                // prevent SQL injection
                $result = $this->connection->real_escape_string($parameters);
            return     $result;
        }
    }

    ?>
    <?php
    include_once("Database.php");

    class     DatabaseFactory{
            // Singleton
            private static $connection;

        public static function     getDatabase(){
            if(    self::$connection == null){
                    $url = "dt5.ehb.be";
                    $user = "1920WEBINT038";
                    $passw = "94617528";
                    $db = "1920WEBINT038";
                    self::$connection = new Database($url, $user, $passw, $db);
            }
            return     self::$connection;
        }
    }

    ?>
    <?php

    class Book{
        public     $bookId;
        public     $title;
        public     $releasedate;
        public     $priceExclVAT;
        public     $emailPublisher;

        public function     __construct($bookId, $title, $releasedate, $priceExclVAT, $emailPublisher)
        {
                $this->bookId = $bookId;
                $this->title = $title;
                $this->releasedate = $releasedate;
                $this->priceExclVAT = $priceExclVAT;
                $this->emailPublisher = $emailPublisher;
        }

    }

    ?>
    up
    -8
    user at note dot com
    4 years ago
    <?php

    include_once("data/Book.php");
    include_once(    "DatabaseFactory.php");
    // CRUD methods for book objects
    class BookDB{

        private static function     getConnection(){
            return     DatabaseFactory::getDatabase();
        }

        public static function     getAll(){
                $query = "SELECT * FROM Book";
                // Execute query
                $conn = self::getConnection();
                $results = $conn->executeQuery($query);

                $resultsArray = array();

            for(    $i = 0; $i < $results->num_rows; $i++){
                    $row = $results->fetch_array(); // Retrieves the current selected row

                // Make a book
                    $book = self::convertRowToObject($row);

                    // Add book to resultsArray
                    $resultsArray[$i] = $book;
            }
            return     $resultsArray;
        }

        public static function     convertRowToObject($row){
            return new     Book(
                    $row["BookId"],
                    $row["Title"],
                    $row["Releasedate"],
                    $row["Price"],
                    $row["EmailPublisher"]
            );
        }

        public static function     insert($book){
            return     self::getConnection()->executeQuery("INSERT INTO Book(Title, Releasedate, Price, EmailPublisher) VALUES ('?', '?', '?', '?')", array($book->title, $book->releasedate, $book->priceExclVAT, $book->emailPublisher));
        }

    }

    ?>
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