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YAZ FunctionsПред.

След.

CLII. YAZ Functions

Введение

- This extension offers a PHP interface to the YAZ toolkit that implements the Z39.50 Protocol for Information Retrieval. With this extension you can easily implement a Z39.50 origin (client) that searches or scans Z39.50 targets (servers) in parallel.

- The module hides most of the complexity of Z39.50 so it should be fairly easy to use. It supports persistent stateless connections very similar to those offered by the various RDB APIs that are available for PHP. This means that sessions are stateless but shared among users, thus saving the connect and initialize phase steps in most cases.

- YAZ is available at http://www.indexdata.dk/yaz/. You can find news information, example scripts, etc. for this extension at http://www.indexdata.dk/phpyaz/.

Замечание: This extension has been moved to the PECL repository and is no longer bundled with

PHP as of PHP 5.0.0.

Установка

- Compile YAZ (ANSI/NISO Z39.50 support) and install it. Build PHP with your favourite modules and add option --with-yaz[=DIR]. Your task is roughly the following:

Пример 1. YAZ compilation 
gunzip -c php-4.3.X.tar.gz|tar xf -

gunzip -c yaz-2.0.tar.gz|tar xf -

cd yaz-2.0

./configure --prefix=/usr

make

make install

cd ../php-4.3.X.

./configure --with-yaz=/usr/bin

make

make install

- If you are using YAZ as a shared extension, add (or uncomment) the following line in php.ini on Unix: 
extension=php_yaz.so

And for Windows: 
extension=php_yaz.dll

- On Windows, php_yaz.dll depend on yaz.dll. You'll find yaz.dll in sub directory dlls in the Win32 zip archive. Copy yaz.dll to a directory in your PATH environment (c:\winnt\system32 or c:\windows\system32).
Внимание
Расширение IMAP не может использоваться вместе с расширениями

перекодировки или YAZ. Это связано с тем фактом, что они оба

используют 1 и тот же внутренний символ.

Замечание: The above problem is solved in version 2.0 of YAZ.

Настройка во время выполнения

-Поведение этих функций зависит от установок в php.ini.

Таблица 1. YAZ configuration options
NameDefaultChangeableChangelog
yaz.max_links"100"PHP_INI_ALLAvailable since PHP4.3.0.
yaz.log_fileNULLPHP_INI_ALLAvailable since PHP4.3.0.

Для подробного описания констант

PHP_INI_*, обратитесь к документации функции ini_set().

Типы ресурсов

Данное расширение не определяет никакие типы ресурсов.

Предопределенные константы

Данное расширение не определяет никакие константы.

Примеры

- PHP/YAZ keeps track of connections with targets (Z-Associations). A resource represents a connection to a target.

- The script below demonstrates the parallel searching feature of the API. When invoked with no arguments it prints a query form; else (arguments are supplied) it searches the targets as given in array host.

Пример 2. Parallel searching using Yaz

<?

$host=$_REQUEST[host];

$query=$_REQUEST[query];

$num_hosts = count($host);

if (empty($query) || count($host) == 0) {

echo '<form method="get">

<input type="checkbox"

name="host[]" value="bagel.indexdata.dk/gils" />

GILS test

<input type="checkbox"

name="host[]" value="localhost:9999/Default" />

local test

<input type="checkbox" checked="checked"

name="host[]" value="z3950.loc.gov:7090/voyager" />

Library of Congress

<br />

RPN Query:

<input type="text" size="30" name="query" />

<input type="submit" name="action" value="Search" />

</form>

';

}else{

echo 'You searched for ' . htmlspecialchars($query) . '<br />';

for ($i = 0; $i < $num_hosts; $i++) {

$id[] = yaz_connect($host[$i]);

yaz_syntax($id[$i], "usmarc");

yaz_range($id[$i], 1, 10);

yaz_search($id[$i], "rpn", $query);

}

yaz_wait();

for ($i = 0; $i < $num_hosts; $i++) {

echo '<hr />' . $host[$i] . ':';

$error = yaz_error($id[$i]);

if (!empty($error)) {

echo "Error: $error";

}else{

$hits = yaz_hits($id[$i]);

echo "Result Count $hits";

}

echo '<dl>';

for ($p = 1; $p <= 10; $p++) {

$rec = yaz_record($id[$i], $p, "string");

if (empty($rec)) continue;

echo "<dt><b>$p</b></dt><dd>";

echo nl2br($rec);

echo "</dd>";

}

echo '</dl>';

}}

?>

Содержание

yaz_addinfo -- Returns additional error information

yaz_ccl_conf -- Configure CCL parser

yaz_ccl_parse -- Invoke CCL Parser

yaz_close -- Close YAZ connection

yaz_connect -- Prepares for a connection to a Z39.50 server

yaz_database -- Specifies the databases within a session

yaz_element -- Specifies Element-Set Name for retrieval

yaz_errno -- Returns error number

yaz_error -- Returns error description

yaz_es_result -- Inspects Extended Services Result

yaz_get_option -- Returns value of option for connection

yaz_hits -- Returns number of hits for last search

yaz_itemorder -- Prepares for Z39.50 Item Order with an ILL-Request package

yaz_present -- Prepares for retrieval (Z39.50 present)

yaz_range -- Specifies a range of records to retrieve

yaz_record -- Returns a record

yaz_scan_result -- Returns Scan Response result

yaz_scan -- Prepares for a scan

yaz_schema -- Specifies schema for retrieval

yaz_search -- Prepares for a search

yaz_set_option -- Sets one or more options for connection

yaz_sort -- Sets sorting criteria

yaz_syntax -- Specifies the preferred record syntax for retrieval

yaz_wait -- Wait for Z39.50 requests to complete

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