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    mysqli_stmt::data_seek

    mysqli_stmt_data_seek

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::data_seek -- mysqli_stmt_data_seek — Adjusts the result pointer to an arbitrary row in the buffered result

    Descrizione

    Stile orientato agli oggetti

    public mysqli_stmt::data_seek(int $offset): void

    Stile procedurale

    mysqli_stmt_data_seek(mysqli_stmt $statement, int $offset): void

    This function moves the result set pointer of the buffered result set to an arbitrary row specified by the offset parameter.

    This function works only on the buffered internal result set. mysqli_stmt_store_result() must be called prior to mysqli_stmt_data_seek().

    Elenco dei parametri

    stmt

    Solo nello stile procedurale: un identificatore di statement restituito da mysqli_stmt_init().

    offset

    Must be between zero and the total number of rows minus one (0.. mysqli_stmt_num_rows() - 1).

    Valori restituiti

    Nessun valore viene restituito.

    Esempi

    Example #1 Stile orientato agli oggetti

    <?php

    mysqli_report    (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    $query = "SELECT Name, CountryCode FROM City ORDER BY Name";
    $stmt = $mysqli->prepare($query);
    $stmt->execute();

    $stmt->bind_result($name, $code);

    $stmt->store_result();

    /* seek to row no. 400 */
    $stmt->data_seek(399);

    $stmt->fetch();

    printf("City: %s Countrycode: %s\n", $name, $code);

    Example #2 Stile procedurale

    <?php

    mysqli_report    (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $link = mysqli_connect("localhost", "my_user", "my_password", "world");

    $query = "SELECT Name, CountryCode FROM City ORDER BY Name";
    $stmt = mysqli_prepare($link, $query);

    mysqli_stmt_execute($stmt);

    mysqli_stmt_bind_result($stmt, $name, $code);

    mysqli_stmt_store_result($stmt);

    /* seek to row no. 400 */
    mysqli_stmt_data_seek($stmt, 399);

    mysqli_stmt_fetch($stmt);

    printf("City: %s Countrycode: %s\n", $name, $code);

    I precedenti esempi visualizzeranno:

    City: Benin City  Countrycode: NGA

    Vedere anche:

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    User Contributed Notes 1 note

    up
    1
    phpnet at stuffonmylaptop dot com
    12 years ago
    Although the documentation says you must provide a number between 0 and count - 1, you can actually supply a negative number, which appears to be cast to positive (such as in abs()).

    For example:

    <?php
    $db     = new mysqli('localhost', 'test', 'password', 'schema');
    $db->multi_query("
    SELECT * FROM
    (
    SELECT 1 as 'position'
    UNION SELECT 2 as 'position'
    UNION SELECT 3 as 'position'
    UNION SELECT 4 as 'position'
    UNION SELECT 5 as 'position'
    ) as rows"    );

    $result = $db->store_result();

    for (    $i = 0; $i < $result->num_rows; $i++)
    {
    $offset = $i;
    $result->data_seek($offset);
    var_dump("Seek offset is: {$offset}", $result->fetch_object());
    }

    for (    $i = 0; $i < $result->num_rows; $i++)
    {
    $offset = -$i;
    $result->data_seek($offset);
    var_dump("Seek offset is: {$offset}", $result->fetch_object());
    }
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