Inventory of Available Data Bases. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 1.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Troutman, Joan C.
Format:	Recurso educativo Open Access
Language:	en
Published:	1967
Subjects:	Automation College Libraries Information Centers Information Processing Information Services Information Sources Information Storage Information Systems Library Services Programing Problems Surveys
Online Access:	Acceder al recurso
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author	Troutman, Joan C.
author_facet	Troutman, Joan C. Troutman, Joan C.
collection	Education Resources Information Center
contents	Inventory of Available Data Bases. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 1. Troutman, Joan C. Automation College Libraries Information Centers Information Processing Information Services Information Sources Information Storage Information Systems Library Services Programing Problems Surveys This survey of data bases emphasizes reference data bases only and is intended to be indicative of the variety and number of magneti" tape files in existence of a type which might be utilized in an information service center in an university library. It reflects both projects undertaken on a large national scale and those which serve the needs of particular organizations. The information assembled about each of the twenty-nine tape files, where possible, is: (1) address and director of the creating agency, (2) a brief description of its nature and contents, (3) file characteristics and size, (4) availability and cost, and (5) references "o further documentation. It was found that those files created for specific purposes of a parent organization were necessarily designed for capability for easy readability for other purposes, while data bases available from organizations in the business of maintaining data bases and providing a variety of services are generally easy to read and well documented. Most of the existing data have simple, hierarchically arranged, field structures. Record formats, however, from one file to another are virtually unrelated. (Author/CM)
format	Recurso educativo Open Access
id	eric_ED023414
institution	ERIC Institute of Education Sciences
language	en
publishDate	1967
record_format	eric
spellingShingle	Inventory of Available Data Bases. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 1. Troutman, Joan C. Automation College Libraries Information Centers Information Processing Information Services Information Sources Information Storage Information Systems Library Services Programing Problems Surveys Inventory of Available Data Bases. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 1. Troutman, Joan C. Automation College Libraries Information Centers Information Processing Information Services Information Sources Information Storage Information Systems Library Services Programing Problems Surveys This survey of data bases emphasizes reference data bases only and is intended to be indicative of the variety and number of magneti" tape files in existence of a type which might be utilized in an information service center in an university library. It reflects both projects undertaken on a large national scale and those which serve the needs of particular organizations. The information assembled about each of the twenty-nine tape files, where possible, is: (1) address and director of the creating agency, (2) a brief description of its nature and contents, (3) file characteristics and size, (4) availability and cost, and (5) references "o further documentation. It was found that those files created for specific purposes of a parent organization were necessarily designed for capability for easy readability for other purposes, while data bases available from organizations in the business of maintaining data bases and providing a variety of services are generally easy to read and well documented. Most of the existing data have simple, hierarchically arranged, field structures. Record formats, however, from one file to another are virtually unrelated. (Author/CM)
title	Inventory of Available Data Bases. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 1.
topic	Automation College Libraries Information Centers Information Processing Information Services Information Sources Information Storage Information Systems Library Services Programing Problems Surveys
url	https://eric.ed.gov/?id=ED023414

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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