PHPerKaigi 2024

oci_close

(PHP 5, PHP 7, PHP 8, PECL OCI8 >= 1.1.0)

oci_closeCloses an Oracle connection

Açıklama

oci_close(resource $connection): ?bool

Unsets connection. The underlying database connection is closed if no other resources are using it and if it was created with oci_connect() or oci_new_connect().

It is recommended to close connections that are no longer needed because this makes database resources available for other users.

Bağımsız Değişkenler

connection

An Oracle connection identifier returned by oci_connect(), oci_pconnect(), or oci_new_connect().

Dönen Değerler

Returns null when oci8.old_oci_close_semantics is enabled, or true otherwise.

Örnekler

Örnek 1 Closing a connection

Resources associated with a connection should be closed to ensure the underlying database connection is properly terminated and the database resources are released.

<?php

$conn
= oci_connect('hr', 'welcome', 'localhost/XE');
if (!
$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$stid = oci_parse($conn, 'SELECT * FROM departments');
$r = oci_execute($stid);
oci_fetch_all($stid, $res);
var_dump($res);

// Free the statement identifier when closing the connection
oci_free_statement($stid);
oci_close($conn);

?>

Örnek 2 Database connections are not closed until all references are closed

The internal refcount of a connection identifier must be zero before the underlying connection to the database is closed.

<?php

$conn
= oci_connect('hr', 'welcome', 'localhost/XE');
if (!
$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$stid = oci_parse($conn, 'SELECT * FROM departments'); // this increases the refcount on $conn
oci_execute($stid);
oci_fetch_all($stid, $res);
var_dump($res);

oci_close($conn);

// $conn is no longer usable in the script but the underlying database
// connection is still held open until $stid is freed.
var_dump($conn); // prints NULL

// While PHP sleeps, querying the Oracle V$SESSION view in a
// terminal window will show that the database user is still connected.
sleep(10);

// When $stid is freed, the database connection is physically closed
oci_free_statement($stid);

// While PHP sleeps, querying the Oracle V$SESSION view in a
// terminal window will show that the database user has disconnected.
sleep(10);

?>

Örnek 3 Closing a connection opened more than once

When database credentials are reused, both connections must be closed before the underlying database connection is closed.

<?php

$conn1
= oci_connect('hr', 'welcome', 'localhost/XE');

// Using the same credentials reuses the same underlying database connection
// Any uncommitted changes done on $conn1 will be visible in $conn2
$conn2 = oci_connect('hr', 'welcome', 'localhost/XE');

// While PHP sleeps, querying the Oracle V$SESSION view in a
// terminal window will show that only one database user is connected.
sleep(10);

oci_close($conn1); // doesn't close the underlying database connection
var_dump($conn1); // prints NULL because the variable $conn1 is no longer usable
var_dump($conn2); // displays that $conn2 is still a valid connection resource

?>

Örnek 4 Connections are closed when variables go out of scope

When all variables referencing a connection go out of scope and are freed by PHP, a rollback occurs (if necessary) and the underlying connection to the database is closed.

<?php

function myfunc() {
$conn = oci_connect('hr', 'hrpwd', 'localhost/XE');
if (!
$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$stid = oci_parse($conn, 'UPDATE mytab SET id = 100');
oci_execute($stid, OCI_NO_AUTO_COMMIT);
return
"Finished";
}

$r = myfunc();
// At this point a rollback occurred and the underlying database connection was released.

print $r; // displays the function return value "Finished"

?>

Notlar

Bilginize:

Variables that have a dependency on the connection identifier, such as statement identifiers returned by oci_parse(), must also be freed before the underlying database connection is closed.

Bilginize:

The oci_close() function does not close the underlying database connections created with oci_pconnect().

Ayrıca Bakınız

add a note

User Contributed Notes 2 notes

up
1
Fahd Alwashmi (F-A-W)
11 years ago
please note, you can use oci_close() to close persistent connections opened with oci_pconnect() in PHP ver 5.3 or above.
as stated in here:
http://www.php.net/manual/en/oci8.configuration.php#ini.oci8.persistent-timeout
up
-3
yepster at hotmail dot com
22 years ago
For using persistent connections && being able to sleep, I use:

function close_db_locks_on_abort( ) {
global $conn;
if( connection_aborted() ) {
$fp = fopen( "/tmp/shutdown-func.txt", "a" );
fwrite( $fp, sprintf( "connection aborted on %s\n", date( "d-m-Y H:i:s" ) ) );
if( $conn ) {
OCIRollBack( $conn );
fwrite( $fp, sprintf( "-- DURING CONNECTION! ip=%s, user=%s, page=%s\n", $_SERVER["REMOTE_ADDR"], $_SERVER["PHP_AUTH_USER"], $_SERVER["SCRIPT_FILENAME"] ) );
}
fclose( $fp );
}
}

register_shutdown_function ( "close_db_locks_on_abort" );

This makes sure a rollback is done on a connection when a user hits 'stop', so there will be no locks on table rows.
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