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

Descrierea

Stil obiect-orientat

mysqli_result::fetch_fields ( void ) : array

Stil procedural

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.

Parametri

result

Numai stilul procedural: Un identificator al setului de rezultate întors de mysqli_query(), mysqli_store_result() sau mysqli_use_result ().

Valorile întoarse

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)

Exemple

Example #1 Stil obiect-orientat

<?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();
?>

Example #2 Stil procedural

<?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);
?>

Exemplele de mai sus vor afișa:

======================
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

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