mysqli::use_result
, mysqli_use_result
mysqli::use_result
mysqli_use_result
Initiate a result set retrieval
Description
Object oriented stylemysqli_result mysqli::use_result();
Procedural stylemysqli_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 20.140. 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
mysqli_real_query
|
mysqli_store_result |