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    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();
    ?>

    See Also

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    User Contributed Notes 4 notes

    up
    4
    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
    1
    ChrisH
    5 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
    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.
    up
    -8
    lussnig at smcc dot de
    19 years ago
    send_long_data() these function is normaly used to store Data in Binary blob field. But if the table is UTF8 and connection charset it does not expect binary data (for example images) it take utf8 Data.
    This mean you have to do utf8_encode bevore sending binary data.
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