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    mysqli::change_user

    mysqli_change_user

    (PHP 5, PHP 7, PHP 8)

    mysqli::change_user -- mysqli_change_user — Changes the user of the specified database connection

    Açıklama

    Nesne yönelimli kullanım

    public mysqli::change_user(string $username, string $password, ?string $database): bool

    Yordamsal kullanım

    mysqli_change_user(
        mysqli $mysql,
        string $username,
        string $password,
        ?string $database
    ): bool

    Changes the user of the specified database connection and sets the current database.

    In order to successfully change users a valid username and password parameters must be provided and that user must have sufficient permissions to access the desired database. If for any reason authorization fails, the current user authentication will remain.

    Bağımsız Değişkenler

    bağlantı

    Sadece yordamsal tarz: mysqli_connect() veya mysqli_init() işlevinden dönen bir mysqli nesnesi.

    username

    The MySQL user name.

    password

    The MySQL password.

    database

    The database to change to.

    If desired, the null value may be passed resulting in only changing the user and not selecting a database. To select a database in this case use the mysqli_select_db() function.

    Dönen Değerler

    Başarı durumunda true, başarısızlık durumunda false döner.

    Hatalar/İstisnalar

    Eğer mysqli hata bildirimi etkinse (MYSQLI_REPORT_ERROR) ve istenen işlem başarısız olursa bir uyarı üretilir. Ek olarak, kip MYSQLI_REPORT_STRICT ise bunun yerine mysqli_sql_exception istisnası oluşur.

    Örnekler

    Örnek 1 mysqli::change_user() example

    Nesne yönelimli kullanım

    <?php

    /* connect database test */
    $mysqli = new mysqli("localhost", "my_user", "my_password", "test");

    /* check connection */
    if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
    }

    /* Set Variable a */
    $mysqli->query("SET @a:=1");

    /* reset all and select a new database */
    $mysqli->change_user("my_user", "my_password", "world");

    if (    $result = $mysqli->query("SELECT DATABASE()")) {
    $row = $result->fetch_row();
    printf("Default database: %s\n", $row[0]);
    $result->close();
    }

    if (    $result = $mysqli->query("SELECT @a")) {
    $row = $result->fetch_row();
    if (    $row[0] === NULL) {
    printf("Value of variable a is NULL\n");
    }
    $result->close();
    }

    /* close connection */
    $mysqli->close();
    ?>

    Yordamsal kullanım

    <?php
    /* connect database test */
    $link = mysqli_connect("localhost", "my_user", "my_password", "test");

    /* check connection */
    if (!$link) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
    }

    /* Set Variable a */
    mysqli_query($link, "SET @a:=1");

    /* reset all and select a new database */
    mysqli_change_user($link, "my_user", "my_password", "world");

    if (    $result = mysqli_query($link, "SELECT DATABASE()")) {
    $row = mysqli_fetch_row($result);
    printf("Default database: %s\n", $row[0]);
    mysqli_free_result($result);
    }

    if (    $result = mysqli_query($link, "SELECT @a")) {
    $row = mysqli_fetch_row($result);
    if (    $row[0] === NULL) {
    printf("Value of variable a is NULL\n");
    }
    mysqli_free_result($result);
    }

    /* close connection */
    mysqli_close($link);
    ?>

    Yukarıdaki örneklerin çıktısı:

    Default database: world
Value of variable a is NULL

    Notlar

    Bilginize:

    Using this command will always cause the current database connection to behave as if was a completely new database connection, regardless of if the operation was completed successfully. This reset includes performing a rollback on any active transactions, closing all temporary tables, and unlocking all locked tables.

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