yaz_search
(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)
yaz_search — Prepares for a search
说明
$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.
参数
-
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.
Note:
If you would like to use a more friendly notation, use the CCL parser - functions yaz_ccl_conf() and yaz_ccl_parse().
返回值
成功时返回 TRUE， 或者在失败时返回 FALSE。
范例
Example #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