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  <refentry id="function.mysql-unbuffered-query">
   <refnamediv>
    <refname>mysql_unbuffered_query</refname>
    <refpurpose>
     Send an SQL query to MySQL, without fetching and buffering the
     result rows
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>resource</type><methodname>mysql_unbuffered_query</methodname>
      <methodparam><type>string</type><parameter>query</parameter></methodparam>
      <methodparam choice="opt"><type>resource</type><parameter>link_identifier</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>mysql_unbuffered_query</function> sends a SQL query
     <parameter>query</parameter> to MySQL, without fetching and
     buffering the result rows automatically, as
     <function>mysql_query</function> does.  On the one hand, this
     saves a considerable amount of memory with SQL queries that
     produce large result sets. On the other hand, you can start
     working on the result set immediately after the first row has
     been retrieved: you don't have to wait until the complete SQL
     query has been performed.  When using multiple DB-connects, you
     have to specify the optional parameter
     <parameter>link_identifier</parameter>.
    </para>
    <note>
     <para>
      The benefits of <function>mysql_unbuffered_query</function> come
      at a cost: You cannot use <function>mysql_num_rows</function> and
      <function>mysql_data_seek</function> on a result set returned from
      <function>mysql_unbuffered_query</function>. You also have to
      fetch all result rows from an unbuffered SQL query, before you
      can send a new SQL query to MySQL.
     </para>
    </note>
    <para>
     See also: <function>mysql_query</function>.
    </para>
   </refsect1>
  </refentry>

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