yaz_search
(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)
yaz_search — Prepares for a search
Beschreibung
$id, string $type, string $query): boolyaz_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.
Parameter-Liste
-
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 @andquery1 query2intersection of query1 and query2 @orquery1 query2union of query1 and query2 @notquery1 query2query1 and not query2 @setnameresult set reference @attrsetset 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. You can find information about attributes at the » Z39.50 Maintenance Agency site.
Hinweis:
If you would like to use a more friendly notation, use the CCL parser - functions yaz_ccl_conf() and yaz_ccl_parse().
Rückgabewerte
Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.
Beispiele
Beispiel #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.
The query
@and @or a b @not @or c d e
(a or b) and ((c or d) not
e).
Another, more complex, one:
@attrset gils @and @attr 1=4 art @attr 1=2000 company
art occur in the title (GILS,BIB-1)
and in which company occur as Distributor (GILS).
