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Bibliographic Details
Format:	Recurso educativo Open Access
Language:	en
Published:	1991
Subjects:	Computers Database Design Databases Dropout Prevention Dropout Research Elementary Secondary Education Online Searching Reference Services Search Strategies
Online Access:	https://eric.ed.gov/?id=ED347268
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_version_	1867181332190199808
collection	Education Resources Information Center
contents	The FOCUS Database: The Nation's Premier Resource in Dropout Prevention. Instruction Manual. Computers Database Design Databases Dropout Prevention Dropout Research Elementary Secondary Education Online Searching Reference Services Search Strategies This booklet is an instruction manual for those using the FOCUS database, an information source on dropout prevention of the National Dropout Prevention Center. An introduction lists the FOCUS files, which include Program Profiles, Calendar of Events, Resource Materials Library, Organizations, and Consultants and Speakers. Also given is the telephone number of a contact person to call for assistance in using the database. Other topics covered in the manual include the following: (1) access; (2) Internet users; (3) personal computer and modem users; (4) general directions for beginning a FOCUS session; (5) searching mechanisms of FOCUS; (6) general searching instructions; (7) program profiles; (8) calendar of events; (9) resource materials library; (10) organizations; and (11) consultants and speakers. Six appendixes contain formats for preparing a search, suggested search terms, searching techniques (Boolean operators, field qualification, and truncation), topics for searching the Resource Materials Library, descriptors for the Organizations file, and areas of expertise for searching the Consultants and Speakers file. The instructions are illustrated with numerous figures showing sample computer screens. (JB)
format	Recurso educativo Open Access
id	eric_ED347268
institution	ERIC Institute of Education Sciences
language	en
publishDate	1991
record_format	eric
spellingShingle	The FOCUS Database: The Nation's Premier Resource in Dropout Prevention. Instruction Manual. Computers Database Design Databases Dropout Prevention Dropout Research Elementary Secondary Education Online Searching Reference Services Search Strategies The FOCUS Database: The Nation's Premier Resource in Dropout Prevention. Instruction Manual. Computers Database Design Databases Dropout Prevention Dropout Research Elementary Secondary Education Online Searching Reference Services Search Strategies This booklet is an instruction manual for those using the FOCUS database, an information source on dropout prevention of the National Dropout Prevention Center. An introduction lists the FOCUS files, which include Program Profiles, Calendar of Events, Resource Materials Library, Organizations, and Consultants and Speakers. Also given is the telephone number of a contact person to call for assistance in using the database. Other topics covered in the manual include the following: (1) access; (2) Internet users; (3) personal computer and modem users; (4) general directions for beginning a FOCUS session; (5) searching mechanisms of FOCUS; (6) general searching instructions; (7) program profiles; (8) calendar of events; (9) resource materials library; (10) organizations; and (11) consultants and speakers. Six appendixes contain formats for preparing a search, suggested search terms, searching techniques (Boolean operators, field qualification, and truncation), topics for searching the Resource Materials Library, descriptors for the Organizations file, and areas of expertise for searching the Consultants and Speakers file. The instructions are illustrated with numerous figures showing sample computer screens. (JB)
title	The FOCUS Database: The Nation's Premier Resource in Dropout Prevention. Instruction Manual.
topic	Computers Database Design Databases Dropout Prevention Dropout Research Elementary Secondary Education Online Searching Reference Services Search Strategies
url	https://eric.ed.gov/?id=ED347268

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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Registered Handlers

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