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    oci_close

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

    oci_close — Closes an Oracle connection

    설명

    bool oci_close ( resource $connection )

    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.

    인수

    connection

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

    반환값

    성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

    예제

    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 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);

    ?>

    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"

    ?>

    주의

    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().

    참고

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    User Contributed Notes 2 notes

    up
    1
    Fahd Alwashmi (F-A-W)
    12 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
    -1
    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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