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yaz_range

(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)

yaz_range 取得するレコードの範囲を指定する

説明

yaz_range ( resource $id , int $start , int $number ) : void

取得するレコードの範囲を指定します。

この関数は、yaz_search() あるいは yaz_present() の前にコールしなければなりません。

パラメータ

id

yaz_connect() が返す接続リソース。

start

取得する最初のレコードの位置を指定します。レコード番号は 1 から yaz_hits() までです。

number

取得するレコードの数を指定します。

返り値

値を返しません。

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User Contributed Notes 1 note

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andrew dot isherwood at ptfs-europe dot com
4 years ago
Note that yaz_range probably doesn't do what you think it's going to to do. i.e. cause the result set to be returned according to the "start" and "number" parameters you supply.

Quoting this thread:
http://lists.indexdata.dk/pipermail/yazlist/2006-November/001752.html

"Generally, the record offset that you give to yaz_record() is the offset into the result set, not into any subset identified by yaz_range(). This is crucial: The yaz_range() function is strictly there to help you write more optimized client code; you do not need to call it.

In other words, if you want to display record numbers 10 to 20 from your set, you loop from 10 to 20 and call yaz_record() for each record. The underlying code will retrieve records as necessary on demand.

However, if you call yaz_range() before you call yaz_wait(), the underlying code will optimize it's behavior.. it will either ask the
server to return records along with the search recult, or submit a single present request to fetch the records (if you're not asking for too many).. it makes no difference in a quick hack, but it can make a dramatic difference if you're designing for many users or heavy traffic. Your loop over yaz_record() will be the same whether you have called yaz_range() first, or not."
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