PHP - Manual: oci_close

2024-11-15

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oci_close

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

oci_close — 关闭 Oracle 连接

说明

oci_close(resource $connection): bool

oci_close() 将 Oracle 连接 connection 关闭。

注意:
自版本 1.1 起 oci_close() 正确关闭 Oracle 连接。使用 oci8.old_oci_close_semantics 选项来恢复本函数的旧行为。

成功时返回 true，或者在失败时返回 false。

注意:
在 PHP 5.0.0 之前的版本必须使用 ocilogoff() 替代本函数。该函数名仍然可用，为向下兼容作为 oci_close() 的别名。不过其已被废弃，不推荐使用。

参数

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

返回值

成功时返回 true，或者在失败时返回 false。

范例

示例 #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);

?>

示例 #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);

?>

示例 #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

?>

示例 #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"

?>

注释

注意:
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.

注意:
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.

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

注意:
In PHP versions before 5.0.0 you must use ocilogoff() instead.

参见

oci_connect() - 建立一个到 Oracle 服务器的连接
oci_free_statement() - 释放关联于语句或游标的所有资源

add a note

User Contributed Notes 2 notes

down

Fahd Alwashmi (F-A-W) ¶

10 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

down

-1

yepster at hotmail dot com ¶

20 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.

add a note

官方地址：https://www.php.net/manual/en/function.oci-close.php

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PHP官方手册 - 互联网笔记

oci_close

说明

参数

返回值

范例

注释

参见

User Contributed Notes 2 notes