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Bibliographic Details
Format:	Recurso educativo Open Access
Language:	en
Published:	1990
Subjects:	Community Involvement Databases Dropout Prevention Dropout Programs Information Retrieval Online Catalogs Online Searching Online Systems Profiles Program Descriptions Resource Materials Secondary Education
Online Access:	https://eric.ed.gov/?id=ED327596
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Instruction Manual for FOCUS, The National Dropout Prevention Center Database. Version 1.0. Community Involvement Databases Dropout Prevention Dropout Programs Information Retrieval Online Catalogs Online Searching Online Systems Profiles Program Descriptions Resource Materials Secondary Education FOCUS is a database containing dropout prevention information at Clemson University (South Carolina). FOCUS provides access to the following data files: (1) Dropout Prevention Program Profiles; (2) Dropout Calendar of Events (National); (3) Dropout Calendar of Events (South Carolina Only); and (4) Dropout Resource Materials Library. The Program Profiles file includes information about hundreds of dropout prevention programs currently operating in U.S. schools. The Calendar of Events files include information about conferences, seminars, workshops, and meetings related to dropout prevention. FOCUS can be accessed in the following ways: (1) via DORIS (Document Online Retrieval Information System) by Clemson University campus users; (2) via the CUFAN network by South Carolina users; (3) via Telenet by authorized users nationwide; and (4) via personal computer and modem. This manual provides instructions for searching FOCUS by remote access. It is comprised of the following sections: (1) introduction; (2) instructions for access via various carriers; (3) general directions to begin a FOCUS session; (4) the searching mechanism of FOCUS; (5) general searching instructions; (6) information on Program Profiles records and sample searches; (7) information on Calendar of Events records and sample searches; and (8) appendixes covering search preparation, suggested search terms, searching techniques, and topics for searching the Resource Materials Library. Update pages are included. (AF)

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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