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    mysqli::$warning_count

    mysqli_warning_count

    (PHP 5, PHP 7, PHP 8)

    mysqli::$warning_count -- mysqli_warning_count — Returns the number of warnings from the last query for the given link

    Descrizione

    Stile orientato agli oggetti

    int $mysqli->warning_count;

    Stile procedurale

    mysqli_warning_count(mysqli $mysql): int

    Returns the number of warnings from the last query in the connection.

    Nota:

    For retrieving warning messages you can use the SQL command SHOW WARNINGS [limit row_count].

    Elenco dei parametri

    link

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

    Valori restituiti

    Number of warnings or zero if there are no warnings.

    Esempi

    Example #1 $mysqli->warning_count example

    Stile orientato agli oggetti

    <?php
    $mysqli     = new mysqli("localhost", "my_user", "my_password", "world");

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

    $mysqli->query("CREATE TABLE myCity LIKE City");

    /* a remarkable city in Wales */
    $query = "INSERT INTO myCity (CountryCode, Name) VALUES('GBR',
    'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')"    ;

    $mysqli->query($query);

    if (    $mysqli->warning_count) {
    if (    $result = $mysqli->query("SHOW WARNINGS")) {
    $row = $result->fetch_row();
    printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
    $result->close();
    }
    }

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

    Stile procedurale

    <?php
    $link     = mysqli_connect("localhost", "my_user", "my_password", "world");

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

    mysqli_query($link, "CREATE TABLE myCity LIKE City");

    /* a remarkable long city name in Wales */
    $query = "INSERT INTO myCity (CountryCode, Name) VALUES('GBR',
    'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')"    ;

    mysqli_query($link, $query);

    if (    mysqli_warning_count($link)) {
    if (    $result = mysqli_query($link, "SHOW WARNINGS")) {
    $row = mysqli_fetch_row($result);
    printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
    mysqli_free_result($result);
    }
    }

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

    I precedenti esempi visualizzeranno:

    Warning (1264): Data truncated for column 'Name' at row 1

    Vedere anche:

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