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(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)
yaz_search — Prepares for a search
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.
The connection resource returned by yaz_connect().
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.
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.
| 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.
Informacja: If you would like to use a more friendly notation, use the CCL parser - functions yaz_ccl_conf() and yaz_ccl_parse().
Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.
Przykład #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
Another, more complex, one:
@attrset gils @and @attr 1=4 art @attr 1=2000 company
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