Out for a Spin: A School Librarian Test Drives 14 CD-ROM Encyclopedias.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Del Vecchio, Stephen
Format:	Recurso educativo Open Access
Language:	en
Published:	1997
Subjects:	Adolescents Appropriate Technology Children Comparative Analysis Encyclopedias Libraries Multimedia Materials Optical Data Disks Printed Materials
Online Access:	Acceder al recurso
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_version_	1867181260828311552
author	Del Vecchio, Stephen
author_facet	Del Vecchio, Stephen Del Vecchio, Stephen
collection	Education Resources Information Center
contents	Out for a Spin: A School Librarian Test Drives 14 CD-ROM Encyclopedias. Del Vecchio, Stephen Adolescents Appropriate Technology Children Comparative Analysis Encyclopedias Libraries Multimedia Materials Optical Data Disks Printed Materials A school librarian reviews CD-ROM encyclopedias, determining their suitability for school and public library use with children and young adults, and favoring content and accessibility over special features and multimedia enhancements. Outlines essential considerations when choosing encyclopedias (price, network and print versions, and online encyclopedias) and provides a chart comparing fourteen CD-ROM encyclopedias in twelve areas. (PEN)
format	Recurso educativo Open Access
id	eric_EJ550882
institution	ERIC Institute of Education Sciences
language	en
publishDate	1997
record_format	eric
spellingShingle	Out for a Spin: A School Librarian Test Drives 14 CD-ROM Encyclopedias. Del Vecchio, Stephen Adolescents Appropriate Technology Children Comparative Analysis Encyclopedias Libraries Multimedia Materials Optical Data Disks Printed Materials Out for a Spin: A School Librarian Test Drives 14 CD-ROM Encyclopedias. Del Vecchio, Stephen Adolescents Appropriate Technology Children Comparative Analysis Encyclopedias Libraries Multimedia Materials Optical Data Disks Printed Materials A school librarian reviews CD-ROM encyclopedias, determining their suitability for school and public library use with children and young adults, and favoring content and accessibility over special features and multimedia enhancements. Outlines essential considerations when choosing encyclopedias (price, network and print versions, and online encyclopedias) and provides a chart comparing fourteen CD-ROM encyclopedias in twelve areas. (PEN)
title	Out for a Spin: A School Librarian Test Drives 14 CD-ROM Encyclopedias.
topic	Adolescents Appropriate Technology Children Comparative Analysis Encyclopedias Libraries Multimedia Materials Optical Data Disks Printed Materials
url	https://eric.ed.gov/?id=EJ550882

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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