(PHP 5, PHP 7, PHP 8)
mysqli::use_result — mysqli_use_result — Initiate a result set retrieval
Description
Object-oriented style
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.
Parameters
This function has no parameters.
Return Values
Returns an unbuffered result object or false if an error occurred.
Examples
Example #1 mysqli::use_result() example
$mysqli = new mysqli(“localhost”, “my_user”, “my_password”, “world”);/* check connection */
if (mysqli_connect_errno()) {
printf(“Connect failed: %sn”, mysqli_connect_error());
exit();
}$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(“%sn”, $row[0]);
}
$result->close();
}
/* print divider */
if ($mysqli->more_results()) {
printf(“—————–n”);
}
} while ($mysqli->next_result());
}/* close connection */
$mysqli->close();
?> $link = mysqli_connect(“localhost”, “my_user”, “my_password”, “world”);/* check connection */
if (mysqli_connect_errno()) {
printf(“Connect failed: %sn”, mysqli_connect_error());
exit();
}$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(“%sn”, $row[0]);
}
mysqli_free_result($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