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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

    Descrizione

    Stile orientato agli oggetti

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

    Stile procedurale

    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.

    Elenco dei parametri

    link

    Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()

    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.

    Valori restituiti

    Restituisce true in caso di successo, false in caso di fallimento.

    Errori/Eccezioni

    If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

    Esempi

    Example #1 mysqli::change_user() example

    Stile orientato agli oggetti

    <?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();
    ?>

    Stile procedurale

    <?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);
    ?>

    I precedenti esempi visualizzeranno:

    Default database: world
Value of variable a is NULL

    Note

    Nota:

    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.

    Vedere anche:

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