mysql_field_seek

(PHP 4, PHP 5)

mysql_field_seek — Set result pointer to a specified field offset

Avviso

Questa enstensione deprecata da PHP 5.5.0, e sarà rimossa in futuro. Al suo posto, usare l'estensione MySQLi o PDO_MySQL. Vedere anche la guida MySQL: scelta dell'API e le FAQ relative per ulteriori informazioni. Le alternative a questa funzione includono:

mysqli_field_seek()
PDOStatement::fetch() using the cursor_orientation and offset parameters

Descrizione

mysql_field_seek(resource $result, int $field_offset): bool

Seeks to the specified field offset. If the next call to mysql_fetch_field() doesn't include a field offset, the field offset specified in mysql_field_seek() will be returned.

Elenco dei parametri

result: The risultato resource che che viene calcolato. Questo risultato deriva dal una chiamata a mysql_query().
field_offset: L'offset numerico dei campi. field_offset inizia da 0. Se field_offset non esiste, viene generato un errore di livello E_WARNING.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Vedere anche:

mysql_fetch_field() - Get column information from a result and return as an object

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User Contributed Notes 4 notes

down

adrien dot gibrat at gmail dot com ¶

16 years ago

Not dumb at all!!

It means that "mysql_field_seek" and "mysql_data_seek" are moving the same cursor... through the rows and columns of the result resource.

Also means that the cursor goes to a new row when it reach a final field(aka column), by exemple while looping with "mysql_fetch_field".

Calling "mysql_fetch_object", "mysql_fetch_array", "mysql_fetch_assoc"
and "mysql_fetch_row" seems to place the cursor at the end of the line.

So calling "mysql_fetch_field" without a field index, just after that, will return false.

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-1

chris at igwsolutions dot com ¶

16 years ago

I spent a good deal of time trying to get the example to work, but the example does not work. 
To do what the exaple is trying to do, you would need to use mysql_data_seek

assume we have table named testing which contains
id      name
1       Hassan
2       Jack
3       Rose
---------------

Here is an expample that will do the above example. 

Since I am more comfortable in a OOP setting, I used mysql_fetch_object

<?php
    require("myConnenctionFile.php");
    
    $sql="SELECT  * from testing";
    $result=mysql_query($sql);

    $row = mysql_fetch_object($result);
    echo $row->id . ' ' . $row->name; // Output is (1      Hassan)
    mysql_data_seek($result,2);
    $row = mysql_fetch_object($result);
    echo $row->id . ' ' . $row->name; // Output is (3      Rose)
    echo "<BR><BR>";
?>

down

-1

poulpillusion at free dot fr ¶

17 years ago

A dumb comment... but it may save people some time : 
mysql_field_seek != mysql_data_seek

In order to fetch again the results of a resource result from the beginning, you will use mysql_data_seek(id, 0)

down

-4

Hassan Kazem ¶

16 years ago

an example of this function
assume we have table1 which contains
ID      Name
1       Hassan
2       Jack
3       Rose
---------------
<?php 
mysql_connect("sql.server.com", "username", "password") or die(mysql_error()); 
mysql_select_db("database") or die(mysql_error()); 
$sql="SELECT  * from table1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
echo $row['ID'] . ' ' . $row['Name']; // Output is (1      Hassan)
mysql_field_seek($result,2);
echo $row['ID'] . ' ' . $row['Name']; // Output is (3      Rose)
?>
---------------
// You can see that the seek command forwarded the pointer one step and skipped row number 2

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