MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysqli::use_result
mysqli_use_result
Initiate a result set retrieval
Object oriented style
public mysqli_result mysqli::use_result();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.
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.
Returns an unbuffered result object or
false if an error occurred.
Example 3.68 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
mysqli_real_query
|
mysqli_store_result
|