Php/docs/function.oci-close
oci_close
(PHP 5, PHP 7, PECL OCI8 >= 1.1.0)
oci_close — 关闭 Oracle 连接
说明
oci_close
( resource $connection
) : bool
oci_close() 将 Oracle 连接
connection 关闭。
Note:
自版本 1.1 起 oci_close() 正确关闭 Oracle 连接。使用 oci8.old_oci_close_semantics 选项来恢复本函数的旧行为。
成功时返回 true， 或者在失败时返回 false。
Note:
在 PHP 5.0.0 之前的版本必须使用 ocilogoff() 替代本函数。该函数名仍然可用，为向下兼容作为 oci_close() 的别名。不过其已被废弃，不推荐使用。
参数
connection- An Oracle connection identifier returned by oci_connect(), oci_pconnect(), or oci_new_connect().
返回值
成功时返回 true， 或者在失败时返回 false。
范例
Example #1 Closing a connection
Resources associated with a connection should be closed to ensure the underlying database connection is properly terminated and the database resources are released.
<?php$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 connectionoci_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 $connoci_execute($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 $stid is freed, the database connection is physically closedoci_free_statement($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 connectionvar_dump($conn1); // prints NULL because the variable $conn1 is no longer usablevar_dump($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.
<?phpfunction 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
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.
