mysqli::use_result

mysqli_use_result

(PHP 5, PHP 7, PHP 8)

mysqli::use_result -- mysqli_use_resultInitiate a result set retrieval

说明

面向对象风格

public mysqli::use_result ( ) : mysqli_result|false

过程化风格

mysqli_use_result ( mysqli $mysql ) : mysqli_result|false

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.

参数

此函数没有参数。

返回值

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

范例

Example #1 mysqli::use_result() example

面向对象风格

<?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();
?>

过程化风格

<?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);
?>

以上例程会输出:

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

参见

User Contributed Notes

Alex Simes 07-Apr-2016 07:47
You should get a PHP Strict Standards message if you don't check whether to call next_result() in the do-while clause. Just add a second condition to the do-while clause to solve this.

<?php
if ($conn->multi_query($sql)) {
    do {
        if (
$result = $conn->use_result()) {
            while (
$row = $result->fetch_row()) {
             
//do stuff with $row
           
}
           
$result->close();
        }
    } while (
$conn->more_results() && $conn->next_result());
}
?>
Anonymous 14-Sep-2012 05:30
> 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.

Another way of understanding the "blocking" behavior of this "use_result" method is that by using this method (or the MYSQLI_USE_RESULT flag on the "query" method), if attempting to run a second query of any kind - updates, inserts, selects, or other - while still working with these first results, the second query will fail.  Checking mysqli->error, you should get a "Commands out of sync" error on the second query call.

However, if you use the "store_result" method (or the default MYSQLI_STORE_RESULT flag on the "query" method) instead, the second query will execute just fine.

Just to demonstrate this "blocking" behavior of this "use_result" method, the second query on line 7 below would otherwise fail if you instead used "use_result" on line 3:

<?php
$mysqli
->real_query('SELECT * FROM `test`');
$query = $mysqli->store_result();
while (
$row = $query->fetch_assoc()) {
   
$id = (int) $row['id'];
   
$query2 = $mysqli->query("UPDATE `test` SET `label` = md5(rand()) WHERE `id` = $id");
}
?>