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PHP Manual


mysqli::use_result

mysqli_use_result

(PHP 5)

mysqli::use_result -- mysqli_use_resultInitiate a result set retrieval

Description

Object oriented style

mysqli_result mysqli::use_result ( void )

Procedural style

mysqli_result mysqli_use_result ( mysqli $link )

Used to initiate the retrieval of a result set from the last query executed using the mysqli_real_query() function on the database connection.

Either this or the mysqli_store_result() function must be called before the results of a query can be retrieved, and one or the other must be called to prevent the next query on that database connection from failing.

Note:

The mysqli_use_result() function does not transfer the entire result set from the database and hence cannot be used functions such as mysqli_data_seek() to move to a particular row within the set. To use this functionality, the result set must be stored using mysqli_store_result(). One should not use mysqli_use_result() if a lot of processing on the client side is performed, since this will tie up the server and prevent other threads from updating any tables from which the data is being fetched.

Return Values

Returns an unbuffered result object or FALSE if an error occurred.

Examples

Example #1 mysqli::use_result() example

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 CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
if ($mysqli->multi_query($query)) {
    do {
        
/* store first result set */
        
if ($result $mysqli->use_result()) {
            while (
$row $result->fetch_row()) {
                
printf("%s\n"$row[0]);
            }
            
$result->close();
        }
        
/* print divider */
        
if ($mysqli->more_results()) {
            
printf("-----------------\n");
        }
    } while (
$mysqli->next_result());
}

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

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 CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
if (mysqli_multi_query($link$query)) {
    do {
        
/* store first result set */
        
if ($result mysqli_use_result($link)) {
            while (
$row mysqli_fetch_row($result)) {
                
printf("%s\n"$row[0]);
            }
            
mysqli_free_result($result);
        }
        
/* print divider */
        
if (mysqli_more_results($link)) {
            
printf("-----------------\n");
        }
    } while (
mysqli_next_result($link));
}

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

The above examples will output:

my_user@localhost
-----------------
Amersfoort
Maastricht
Dordrecht
Leiden
Haarlemmermeer

See Also




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