PHP-Handbuch: Fetch meta-data for a single field

Beschreibung

Objektorientierter Stil

object mysqli_result::fetch_field_direct ( int $fieldnr )

Prozeduraler Stil

object mysqli_fetch_field_direct ( mysqli_result $result , int $fieldnr )

Returns an object which contains field definition information from the specified result set.

Parameter-Liste

result: Nur bei prozeduralem Aufruf: Ein von mysqli_query, mysqli_store_result oder mysqli_use_result zurückgegebenes Ergebnisobjekt.
fieldnr: The field number. This value must be in the range from 0 to number of fields - 1.

Rückgabewerte

Returns an object which contains field definition information or FALSE if no field information for specified fieldnr is available.

**Object attributes**
Attribute	Description
name	The name of the column
orgname	Original column name if an alias was specified
table	The name of the table this field belongs to (if not calculated)
orgtable	Original table name if an alias was specified
def	The default value for this field, represented as a string
max_length	The maximum width of the field for the result set.
length	The width of the field, as specified in the table definition.
charsetnr	The character set number for the field.
flags	An integer representing the bit-flags for the field.
type	The data type used for this field
decimals	The number of decimals used (for numeric fields)

Beispiele

Beispiel #1 Objektorientierter Stil


<?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();
}

$query = "SELECT Name, SurfaceArea from Country ORDER BY Name LIMIT 5";

if ($result = $mysqli->query($query)) {

    /* Get field information for column 'SurfaceArea' */
    $finfo = $result->fetch_field_direct(1);

    printf("Name:     %s\n", $finfo->name);
    printf("Table:    %s\n", $finfo->table);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags:    %d\n", $finfo->flags);
    printf("Type:     %d\n", $finfo->type);

    $result->close();
}

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

Beispiel #2 Prozeduraler Stil


<?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();
}

$query = "SELECT Name, SurfaceArea from Country ORDER BY Name LIMIT 5";

if ($result = mysqli_query($link, $query)) {

    /* Get field information for column 'SurfaceArea' */
    $finfo = mysqli_fetch_field_direct($result, 1);

    printf("Name:     %s\n", $finfo->name);
    printf("Table:    %s\n", $finfo->table);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags:    %d\n", $finfo->flags);
    printf("Type:     %d\n", $finfo->type);

    mysqli_free_result($result);
}

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

Die obigen Bespiele erzeugen folgende Ausgabe:

Name:     SurfaceArea
Table:    Country
max. Len: 10
Flags:    32769
Type:     4

Siehe auch

mysqli_num_fields
mysqli_fetch_field
mysqli_fetch_fields