mysqli_stmt::send_long_data

    mysqli_stmt_send_long_data

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::send_long_data -- mysqli_stmt_send_long_data — Send data in blocks

    Description

    Object-oriented style

    public mysqli_stmt::send_long_data(int $param_num, string $data): bool

    Procedural style

    mysqli_stmt_send_long_data(mysqli_stmt $statement, int $param_num, string $data): bool

    Allows to send parameter data to the server in pieces (or chunks), e.g. if the size of a blob exceeds the size of max_allowed_packet. This function can be called multiple times to send the parts of a character or binary data value for a column, which must be one of the TEXT or BLOB datatypes.

    Parameters

    statement

    Procedural style only: A mysqli_stmt object returned by mysqli_stmt_init().

    param_num

    Indicates which parameter to associate the data with. Parameters are numbered beginning with 0.

    data

    A string containing data to be sent.

    Return Values

    Returns true on success or false on failure.

    Examples

    Example #1 Object-oriented style

    <?php
    $stmt     = $mysqli->prepare("INSERT INTO messages (message) VALUES (?)");
    $null = NULL;
    $stmt->bind_param("b", $null);
    $fp = fopen("messages.txt", "r");
    while (!    feof($fp)) {
    $stmt->send_long_data(0, fread($fp, 8192));
    }
    fclose($fp);
    $stmt->execute();
    ?>

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    User Contributed Notes 3 notes

    up
    3
    ChrisH
    4 years ago
    If you are trying to write a single field which is above max_allowed_packet then this function will not help you (contrary to what the documentation example seems to show above).

    Parameters in MySQL are still restricted by max_allowed_packet on a per-field basis so you will get an error like:

    “mysqli_sql_exception: Parameter of prepared statement which is set through mysql_send_long_data() is longer than 'max_long_data_size' bytes”

    The only real use case for this function seems to be if you are writing multiple long fields which when combined would go over max_allowed_packet.
    up
    3
    Gustavo Narea
    18 years ago
    Just in case:

    'max_allowed_packet' is a MySQL variable; it is not a PHP function/variable/constant.

    Further info: http://dev.mysql.com/doc/refman/4.1/en/packet-too-large.html

    HTH.
    up
    0
    DimeCadmium
    3 years ago
    To ChrisH's note, you must call this function multiple times with the same $param_nr, to send the first max_allowed_packet bytes, then the next, and so on. So you might need to do a for loop over changing substr() indexes, or etc.
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