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(PHP 5, PECL OCI8 >= 1.1.0)

oci_close — 關閉 Oracle 連接

說明

oci_close() 將 Oracle 連接 connection 關閉。

Note:

自版本 1.1 起 oci_close() 正確關閉 Oracle 連接。使用 oci8.old_oci_close_semantics 選項來恢復本函數的舊行為。

成功時返回 TRUE， 或者在失敗時返回 FALSE。

Note:

在 PHP 5.0.0 之前的版本必須使用 ocilogoff() 替代本函數。該函數名仍然可用，為向下兼容作為 oci_close() 的別名。不過其已被廢棄，不推薦使用。

參數

connection

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

返回值

成功時返回 TRUE， 或者在失敗時返回 FALSE。

范例

Example #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);

?>

Example #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 long 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);

?>

Example #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

?>

Example #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"

?>

注釋

Note:

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.

Note:

Prior to version PHP 5.1.2 (PECL OCI8 1.1) oci_close() was a no-op. In more recent versions it correctly closes the Oracle connection. Use oci8.old_oci_close_semantics option to restore old behavior of this function.

Note:

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

Note:

In PHP versions before 5.0.0 you must use ocilogoff() instead. 在當前版本中，舊的函數名還可以被使用，但已經被廢棄并不建議使用。

參見

oci_connect() - 建立一個到 Oracle 服務器的連接 oci_free_statement() - 釋放關聯于語句或游標的所有資源