PHP. Руководство по PHP. 2005

mysqli_use_result

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mysqli_use_result

(PHP 5)mysqli_use_result

(no version information, might be only in CVS)mysqli->use_result -- Initiate a result set retrieval

Description

Procedural style:mysqli_result mysqli_use_result (mysqli link)

Object oriented style (method):class mysqli {

mysqli_result use_result (void)

}

mysqli_use_result() is used to initiate the retrieval

of a result set from the last query executed using the

mysqli_real_query() function on the database connection

specified by the link parameter. 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.

Замечание:

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.

Примеры

Пример 1. 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();
?>

Пример 2. 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);
?>

Результат выполнения данного примера:

my_user@localhost

-----------------

Amersfoort

Maastricht

Dordrecht

Leiden

Haarlemmermeer

PHP. Руководство по PHP. 2005

mysqli_use_result

Description

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