yaz_searchPodręcznik PHPPoprzedniNastępnyyaz_search (PHP 4 )yaz_search -- Prepares for a searchDescriptionint yaz_search ( int id, string type, string query)
yaz_search() prepares for a search on the
target with given id. The type represents the query type - only
"rpn" is supported now in which case the third argument specifies
a Type-1 query (RPN). Like yaz_connect() this
function is non-blocking and only prepares for a search to be
executed later when yaz_wait() is called.
The RPN query
The RPN query is a textual represenation 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 operater
precedes the operands. The query string is a sequence of tokens where
white space is ignored is ignored unless surrounded by double
quotes. Tokens beginning with an at-character (@)
are considered operators, otherwise they are treated as search terms.
Tabela 1. RPN OperatorsSyntaxDescription@and query1 query2intersection of query1 and query2@or query1 query2union of query1 and query2@not query1 query2query1 and not query2@set nameresult set reference@attrset set queryspecifies attribute-set for query. This construction is only
allowed once - in the beginning of the whole query@attr set type=value queryapplies 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.Przykład 1. Query Examples
Query
computer
matches documents where "computer" occur. No attributes are specified.
The Query
"donald knuth"
matches documents where "donald knuth" occur.
For the query
@attr 1=4 art
attribute type is 1 (Bib-1 use), attribute value is 4
Title), so this should match documents where art
occur in the title.
Another more complex one:
@attrset gils @and @attr 1=4 art @attr 1=1003 "donald knuth"
The query as a whole uses the GILS attributeset. The query matches
documents where art occur in the title and in which
donald knuth occur in the author.
PoprzedniSpis treściNastępnyyaz_recordPoczątek rozdziałuyaz_present
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