Compzone.Org :: Podręcznik PHP :: mysqli_fetch_field

Podręcznik PHP
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mysqli_fetch_field

(PHP 5)

mysqli_fetch_field

(no version information, might be only in CVS)

result->fetch_field -- Returns the next field in the result set

Description

Procedural style:

object mysqli_fetch_field ( mysqli_result result )

Object oriented style (method):

class mysqli_result {

object fetch_field ( void )

}

The mysqli_fetch_field() returns the definition of one column of a result set as an object. Call this function repeatedly to retrieve information about all columns in the result set. mysqli_fetch_field() returns FALSE when no more fields are left.

Zwracane wartości

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

Tabela 1. Object properties

Property	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 integer fields)

Patrz także

mysqli_num_fields(), mysqli_fetch_field_direct(), mysqli_fetch_fields() i mysqli_field_seek().

Przykłady

Przykład 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 Code LIMIT 5";


                

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

                

                    /* Get field information for all columns */


                    while ($finfo = $result->fetch_field()) {

                 

                        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\n", $finfo->type);


                    }    

                    $result->close();

                }

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

                ?>

Przykład 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 Code LIMIT 5";


                

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

                

                    /* Get field information for all fields */


                    while ($finfo = mysqli_fetch_field($result)) {


                 

                        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\n", $finfo->type);


                    }

                    mysqli_free_result($result);


                }

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

                ?>

Powyższy przykład wyświetli:

Name:     Name
Table:    Country
max. Len: 11
Flags:    1
Type:     254

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

Poprzedni	Spis treści	Następny
mysqli_fetch_field_direct	Początek rozdziału	mysqli_fetch_fields