mysqli_result::fetch_fields

mysqli_fetch_fields

(PHP 5, PHP 7)

mysqli_result::fetch_fields -- mysqli_fetch_fieldsReturns an array of objects representing the fields in a result set

Beschreibung

Objektorientierter Stil

public mysqli_result::fetch_fields ( ) : array

Prozeduraler Stil

mysqli_fetch_fields ( mysqli_result $result ) : array

This function serves an identical purpose to the mysqli_fetch_field() function with the single difference that, instead of returning one object at a time for each field, the columns are returned as an array of objects.

Parameter-Liste

result

Nur bei prozeduralem Aufruf: Ein von mysqli_query(), mysqli_store_result() oder mysqli_use_result() zurückgegebenes Ergebnisobjekt.

Rückgabewerte

Returns an array of objects which contains field definition information or FALSE if no field information is available.

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
max_length The maximum width of the field for the result set.
length The width of the field, in bytes, as specified in the table definition. Note that this number (bytes) might differ from your table definition value (characters), depending on the character set you use. For example, the character set utf8 has 3 bytes per character, so varchar(10) will return a length of 30 for utf8 (10*3), but return 10 for latin1 (10*1).
charsetnr The character set number (id) 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)

Beispiele

Beispiel #1 Objektorientierter Stil

<?php
$mysqli 
= new mysqli("127.0.0.1""root""foofoo""sakila");

/* check connection */
if ($mysqli->connect_errno) {
    
printf("Connect failed: %s\n"$mysqli->connect_error);
    exit();
}

foreach (array(
'latin1''utf8') as $charset) {

    
// Set character set, to show its impact on some values (e.g., length in bytes)
    
$mysqli->set_charset($charset);

    
$query "SELECT actor_id, last_name from actor ORDER BY actor_id";

    echo 
"======================\n";
    echo 
"Character Set: $charset\n";
    echo 
"======================\n";
    
    if (
$result $mysqli->query($query)) {

        
/* Get field information for all columns */
        
$finfo $result->fetch_fields();

        foreach (
$finfo as $val) {
            
printf("Name:      %s\n",   $val->name);
            
printf("Table:     %s\n",   $val->table);
            
printf("Max. Len:  %d\n",   $val->max_length);
            
printf("Length:    %d\n",   $val->length);
            
printf("charsetnr: %d\n",   $val->charsetnr);
            
printf("Flags:     %d\n",   $val->flags);
            
printf("Type:      %d\n\n"$val->type);
        }
        
$result->free();
    }
}
$mysqli->close();
?>

Beispiel #2 Prozeduraler Stil

<?php
$link 
mysqli_connect("127.0.0.1""my_user""my_password""sakila");

/* check connection */
if (mysqli_connect_errno()) {
    
printf("Connect failed: %s\n"mysqli_connect_error());
    exit();
}

foreach (array(
'latin1''utf8') as $charset) {

    
// Set character set, to show its impact on some values (e.g., length in bytes)
    
mysqli_set_charset($link$charset);

    
$query "SELECT actor_id, last_name from actor ORDER BY actor_id";

    echo 
"======================\n";
    echo 
"Character Set: $charset\n";
    echo 
"======================\n";

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

        
/* Get field information for all columns */
        
$finfo mysqli_fetch_fields($result);

        foreach (
$finfo as $val) {
            
printf("Name:      %s\n",   $val->name);
            
printf("Table:     %s\n",   $val->table);
            
printf("Max. Len:  %d\n",   $val->max_length);
            
printf("Length:    %d\n",   $val->length);
            
printf("charsetnr: %d\n",   $val->charsetnr);
            
printf("Flags:     %d\n",   $val->flags);
            
printf("Type:      %d\n\n"$val->type);
        }
        
mysqli_free_result($result);
    }
}

mysqli_close($link);
?>

Die obigen Bespiele erzeugen folgende Ausgabe:

======================
Character Set: latin1
======================
Name:      actor_id
Table:     actor
Max. Len:  3
Length:    5
charsetnr: 63
Flags:     49699
Type:      2

Name:      last_name
Table:     actor
Max. Len:  12
Length:    45
charsetnr: 8
Flags:     20489
Type:      253

======================
Character Set: utf8
======================
Name:      actor_id
Table:     actor
Max. Len:  3
Length:    5
charsetnr: 63
Flags:     49699
Type:      2

Name:      last_name
Table:     actor
Max. Len:  12
Length:    135
charsetnr: 33
Flags:     20489

Siehe auch