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><H1
><A
NAME="function.yaz-search"
></A
>yaz_search</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN248493"
></A
><P
> (PHP 4 >= 4.0.1, PECL)</P
>yaz_search -- Prepares for a search</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248496"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>yaz_search</B
> ( resource id, string type, string query )<BR
></BR
><P
> <B
CLASS="function"
>yaz_search()</B
> prepares for a search on the given
connection.
</P
><P
> Like <A
HREF="function.yaz-connect.html"
><B
CLASS="function"
>yaz_connect()</B
></A
> this function is non-blocking and
only prepares for a search to be executed later when
<A
HREF="function.yaz-wait.html"
><B
CLASS="function"
>yaz_wait()</B
></A
> is called.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248515"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>id</CODE
></DT
><DD
><P
> The connection resource returned by <A
HREF="function.yaz-connect.html"
><B
CLASS="function"
>yaz_connect()</B
></A
>.
</P
></DD
><DT
><CODE
CLASS="parameter"
>type</CODE
></DT
><DD
><P
> This parameter represents the query type - only <TT
CLASS="literal"
>"rpn"</TT
>
is supported now in which case the third argument specifies a Type-1
query in prefix query notation.
</P
></DD
><DT
><CODE
CLASS="parameter"
>query</CODE
></DT
><DD
><P
> 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 (<TT
CLASS="literal"
>@</TT
>) are considered operators,
otherwise they are treated as search terms.
</P
><DIV
CLASS="table"
><A
NAME="AEN248537"
></A
><P
><B
>表 1. RPN Operators</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL
WIDTH="1*"
TITLE="construct"><COL
WIDTH="2*"
TITLE="description"><THEAD
><TR
><TH
>Construct</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="literal"
>@and</TT
> query1 query2</TD
><TD
>intersection of query1 and query2</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>@or</TT
> query1 query2</TD
><TD
>union of query1 and query2</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>@not</TT
> query1 query2</TD
><TD
>query1 and not query2</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>@set</TT
> name</TD
><TD
>result set reference</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>@attrset</TT
> set query</TD
><TD
> specifies attribute-set for query. This construction is only allowed
once - in the beginning of the whole query
</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>@attr</TT
> [set] type=value query</TD
><TD
> 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.
</TD
></TR
></TBODY
></TABLE
></DIV
><P
> You can find information about attributes at the
<A
HREF="http://www.loc.gov/z3950/agency/defns/bib1.html"
TARGET="_top"
>Z39.50 Maintenance Agency</A
>
site.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
If you would like to use a more friendly notation,
use the CCL parser - functions <A
HREF="function.yaz-ccl-conf.html"
><B
CLASS="function"
>yaz_ccl_conf()</B
></A
> and
<A
HREF="function.yaz-ccl-parse.html"
><B
CLASS="function"
>yaz_ccl_parse()</B
></A
>.
</P
></BLOCKQUOTE
></DIV
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248577"
></A
><H2
>返回值</H2
><P
> 如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248582"
></A
><H2
>范例</H2
><TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN248584"
></A
><P
><B
>例 1. Query Examples</B
></P
><P
> You can search for simple terms, like this:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>computer</PRE
></TD
></TR
></TABLE
>
which matches documents where "computer" occur. No attributes are
specified.
</P
><P
> The query
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>"knuth donald"</PRE
></TD
></TR
></TABLE
>
matches documents where "knuth donald" occur (provided that the
server supports phrase search).
</P
><P
> This query applies two attributes for the same phrase.
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>@attr 1=1003 @attr 4=1 "knuth donald"</PRE
></TD
></TR
></TABLE
>
First attribute is type 1 (Bib-1 use), attribute value is 1003
(Author).
Second attribute has is type 4 (structure), value 1 (phrase),
so this should match documents where Donald Knuth is author.
</P
><P
> The query
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>@and @or a b @not @or c d e</PRE
></TD
></TR
></TABLE
>
would in infix notation look like <TT
CLASS="literal"
>(a or b) and ((c or d) not
e)</TT
>.
</P
><P
> Another, more complex, one:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>@attrset gils @and @attr 1=4 art @attr 1=2000 company</PRE
></TD
></TR
></TABLE
>
The query as a whole uses the GILS attributeset. The query matches
documents where <TT
CLASS="literal"
>art</TT
> occur in the title (GILS,BIB-1)
and in which <TT
CLASS="literal"
>company</TT
> occur as Distributor (GILS).
</P
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