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<div id="mysqli-stmt.attr-set" class="refentry">
<div class="refnamediv">
<h1 class="refname">mysqli_stmt::attr_set</h1>
<h1 class="refname">mysqli_stmt_attr_set</h1>
<p class="verinfo">(PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">mysqli_stmt::attr_set</span> -- <span class="refname">mysqli_stmt_attr_set</span> — <span class="dc-title">Used to modify the behavior of a prepared statement</span></p>
</div>
<div class="refsect1 description" id="refsect1-mysqli-stmt.attr-set-description">
<h3 class="title">说明</h3>
<p class="para">面向对象风格</p>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><strong>mysqli_stmt::attr_set</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span> <code class="parameter">$attribute</code></span>, <span class="methodparam"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span> <code class="parameter">$value</code></span>): <span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span></div>
<p class="para rdfs-comment">过程化风格</p>
<div class="methodsynopsis dc-description"><span class="methodname"><strong>mysqli_stmt_attr_set</strong></span>(<span class="methodparam"><span class="type"><a href="class.mysqli-stmt.php" class="type mysqli_stmt">mysqli_stmt</a></span> <code class="parameter">$statement</code></span>, <span class="methodparam"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span> <code class="parameter">$attribute</code></span>, <span class="methodparam"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span> <code class="parameter">$value</code></span>): <span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span></div>
<p class="para rdfs-comment">
Used to modify the behavior of a prepared statement. This function may be
called multiple times to set several attributes.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-mysqli-stmt.attr-set-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl><dt>
<code class="parameter">statement</code></dt><dd><p class="para">仅以过程化样式：由
<span class="function"><a href="mysqli.stmt-init.php" class="function">mysqli_stmt_init()</a></span> 返回的 <span class="classname"><a href="class.mysqli-stmt.php" class="classname">mysqli_stmt</a></span> 对象。</p></dd>
<dt><code class="parameter">attribute</code></dt>
<dd>
<p class="para">
The attribute that you want to set. It can have one of the following values:
<table id="mysqli-stmt.attr-set.parameters" class="doctable table">
<caption><strong>Attribute values</strong></caption>
<thead>
<tr>
<th>Character</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH</td>
<td>
Setting to <strong><code><a href="reserved.constants.php#constant.true">true</a></code></strong> causes <span class="function"><a href="mysqli-stmt.store-result.php" class="function">mysqli_stmt_store_result()</a></span> to
update the metadata <code class="literal">MYSQL_FIELD->max_length</code> value.
</td>
</tr>
<tr>
<td>MYSQLI_STMT_ATTR_CURSOR_TYPE</td>
<td>
Type of cursor to open for statement when <span class="function"><a href="mysqli-stmt.execute.php" class="function">mysqli_stmt_execute()</a></span>
is invoked. <code class="parameter">value</code> can be <strong><code><a href="mysqli.constants.php#constant.mysqli-cursor-type-no-cursor">MYSQLI_CURSOR_TYPE_NO_CURSOR</a></code></strong>
(the default) or <strong><code><a href="mysqli.constants.php#constant.mysqli-cursor-type-read-only">MYSQLI_CURSOR_TYPE_READ_ONLY</a></code></strong>.
</td>
</tr>
<tr>
<td>MYSQLI_STMT_ATTR_PREFETCH_ROWS</td>
<td>
Number of rows to fetch from server at a time when using a cursor.
<code class="parameter">value</code> can be in the range from 1 to the maximum
value of unsigned long. The default is 1.
Removed as of PHP 8.4.0.
</td>
</tr>
</tbody>
</table>
</p>
<p class="para">
If you use the <strong><code><a href="mysqli.constants.php#constant.mysqli-stmt-attr-cursor-type">MYSQLI_STMT_ATTR_CURSOR_TYPE</a></code></strong> option with
<strong><code><a href="mysqli.constants.php#constant.mysqli-cursor-type-read-only">MYSQLI_CURSOR_TYPE_READ_ONLY</a></code></strong>, a cursor is opened for the
statement when you invoke <span class="function"><a href="mysqli-stmt.execute.php" class="function">mysqli_stmt_execute()</a></span>. If there
is already an open cursor from a previous <span class="function"><a href="mysqli-stmt.execute.php" class="function">mysqli_stmt_execute()</a></span> call,
it closes the cursor before opening a new one. <span class="function"><a href="mysqli-stmt.reset.php" class="function">mysqli_stmt_reset()</a></span>
also closes any open cursor before preparing the statement for re-execution.
<span class="function"><a href="mysqli-stmt.free-result.php" class="function">mysqli_stmt_free_result()</a></span> closes any open cursor.
</p>
<p class="para">
If you open a cursor for a prepared statement, <span class="function"><a href="mysqli-stmt.store-result.php" class="function">mysqli_stmt_store_result()</a></span>
is unnecessary.
</p>
</dd>
<dt><code class="parameter">value</code></dt>
<dd>
<p class="para">The value to assign to the attribute.</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-mysqli-stmt.attr-set-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
成功时返回 <strong><code><a href="reserved.constants.php#constant.true">true</a></code></strong>， 或者在失败时返回 <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong>。
</p>
</div>
<div class="refsect1 errors" id="refsect1-mysqli-stmt.attr-set-errors">
<h3 class="title">错误／异常</h3>
<p class="para">
If mysqli error reporting is enabled (<strong><code><a href="mysqli.constants.php#constant.mysqli-report-error">MYSQLI_REPORT_ERROR</a></code></strong>) and the requested operation fails,
a warning is generated. If, in addition, the mode is set to <strong><code><a href="mysqli.constants.php#constant.mysqli-report-strict">MYSQLI_REPORT_STRICT</a></code></strong>,
a <span class="classname"><a href="class.mysqli-sql-exception.php" class="classname">mysqli_sql_exception</a></span> is thrown instead.</p>
</div>
<div class="refsect1 seealso" id="refsect1-mysqli-stmt.attr-set-seealso">
<h3 class="title">参见</h3>
<p class="para">
<ul class="simplelist">
<li><a href="http://dev.mysql.com/doc/en/mysql-stmt-attr-set.html" class="link external">» Connector/MySQL mysql_stmt_attr_set()</a></li>
</ul>
</p>
</div>
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