php-doc-en/reference/mysqli/mysqli_stmt/attr-set.xml

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<refentry xml:id="mysqli-stmt.attr-set" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>mysqli_stmt::attr_set</refname>
  <refname>mysqli_stmt_attr_set</refname>
  <refpurpose>Used to modify the behavior of a prepared statement</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.oop;</para>
  <methodsynopsis role="oop">
   <modifier>public</modifier> <type>bool</type><methodname>mysqli_stmt::attr_set</methodname>
   <methodparam><type>int</type><parameter>attribute</parameter></methodparam>
   <methodparam><type>int</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>&style.procedural;</para>
  <methodsynopsis role="procedural">
   <type>bool</type><methodname>mysqli_stmt_attr_set</methodname>
   <methodparam><type>mysqli_stmt</type><parameter>statement</parameter></methodparam>
   <methodparam><type>int</type><parameter>attribute</parameter></methodparam>
   <methodparam><type>int</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   Used to modify the behavior of a prepared statement. This function may be
   called multiple times to set several attributes.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>&mysqli.stmt.description;<varlistentry>
     <term><parameter>attribute</parameter></term>
     <listitem>
      <para>
       The attribute that you want to set. It can have one of the following values:
       <table xml:id="mysqli-stmt.attr-set.parameters">
        <title>Attribute values</title>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>Character</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry>MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH</entry>
           <entry>
            Setting to &true; causes <function>mysqli_stmt_store_result</function> to
            update the metadata <literal>MYSQL_FIELD-&gt;max_length</literal> value.
           </entry>
          </row>
          <row>
           <entry>MYSQLI_STMT_ATTR_CURSOR_TYPE</entry>
           <entry>
            Type of cursor to open for statement when <function>mysqli_stmt_execute</function>
            is invoked. <parameter>value</parameter> can be <literal>MYSQLI_CURSOR_TYPE_NO_CURSOR</literal>
            (the default) or <literal>MYSQLI_CURSOR_TYPE_READ_ONLY</literal>.
           </entry>
          </row>
          <row>
           <entry>MYSQLI_STMT_ATTR_PREFETCH_ROWS</entry>
           <entry>
            Number of rows to fetch from server at a time when using a cursor.
            <parameter>value</parameter> can be in the range from 1 to the maximum
            value of unsigned long. The default is 1.
           </entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
      <para>
       If you use the <literal>MYSQLI_STMT_ATTR_CURSOR_TYPE</literal> option with
       <literal>MYSQLI_CURSOR_TYPE_READ_ONLY</literal>, a cursor is opened for the
       statement when you invoke <function>mysqli_stmt_execute</function>. If there
       is already an open cursor from a previous <function>mysqli_stmt_execute</function> call,
       it closes the cursor before opening a new one. <function>mysqli_stmt_reset</function>
       also closes any open cursor before preparing the statement for re-execution.
       <function>mysqli_stmt_free_result</function> closes any open cursor.
      </para>
      <para>
       If you open a cursor for a prepared statement, <function>mysqli_stmt_store_result</function>
       is unnecessary.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>The value to assign to the attribute.</para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><link xlink:href="&url.mysql.docs.stmt-attr-set;">Connector/MySQL mysql_stmt_attr_set()</link></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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