PHP: Fetch meta-data for a single field

Description

Object oriented style (method):

object mysqli_result::fetch_field_direct ( int $fieldnr )

Procedural style:

object mysqli_fetch_field_direct ( mysqli_result $result , int $fieldnr )

Returns an object which contains field definition informations from specified resultset.

Parameters

result: Procedural style only: A result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result().
fieldnr: The field number. This value must be in the range from 0 to number of fields - 1.

Return Values

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 tabl 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 integer fields)

Examples

Example #1 Object oriented style


<?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();

?>

Example #2 Procedural style


<?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);

?>

The above example will output:

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

mysqli_result::fetch_field_direct

mysqli_fetch_field_direct

Description

Parameters

Return Values

Examples

See Also