yaz_schema

yaz_set_option

YAZ Функции

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yaz_search

(PHP 4 >= 4.0.1, PECL yaz:0.9-1.0.9)

yaz_search — Prepares for a search

Описание

bool yaz_search ( resource $id , string $type , string $query )

yaz_search() prepares for a search on the given connection.

Like yaz_connect() this function is non-blocking and only prepares for a search to be executed later when yaz_wait() is called.

Список параметров

id

The connection resource returned by yaz_connect().

type

This parameter represents the query type - only "rpn" is supported now in which case the third argument specifies a Type-1 query in prefix query notation.

query

The RPN query is a textual representation of the Type-1 query as defined by the Z39.50 standard. However, in the text representation as used by YAZ a prefix notation is used, that is the operator precedes the operands. The query string is a sequence of tokens where white space is ignored unless surrounded by double quotes. Tokens beginning with an at-character (@) are considered operators, otherwise they are treated as search terms.

RPN Operators

Construct	Description
@and query1 query2	intersection of query1 and query2
@or query1 query2	union of query1 and query2
@not query1 query2	query1 and not query2
@set name	result set reference
@attrset set query	specifies attribute-set for query. This construction is only allowed once - in the beginning of the whole query
@attr [set] type=value query	applies attribute to query. The type and value are integers specifying the attribute-type and attribute-value respectively. The set, if given, specifies the attribute-set.

You can find information about attributes at the » Z39.50 Maintenance Agency site.

Замечание: If you would like to use a more friendly notation, use the CCL parser - functions yaz_ccl_conf() and yaz_ccl_parse().

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Примеры

Пример #1 Query Examples

You can search for simple terms, like this:

computer

    

The query

"knuth donald"

    

This query applies two attributes for the same phrase.

@attr 1=1003 @attr 4=1 "knuth donald"

The query

@and @or a b @not @or c d e

    

Another, more complex, one:

@attrset gils @and @attr 1=4 art @attr 1=2000 company

    

yaz_schema

yaz_set_option

YAZ Функции

PHP Manual