dedecms织梦后台自定义表单添加搜索功能

<div class="bodytitletxt" style="padding-left:10px;">
    <form name='form1' action="diy_list.php">
        <input type='hidden' name='action' value='list' />
        <input type='hidden' name='diyid' value='<?php echo $diy->diyid; ?>' />
        关键字：
        <input type='text' name='keyword' size='20' value="<?php echo $keyword; ?>" />
        <select name="field">
        <?php
            foreach($fieldlist as $k=>$fielddata)
            {
                if($k==$field)
                {
                    echo "<option value='{$k}' selected>{$fielddata[0]}</option>\r\n";
                }
                else
                {
                    echo "<option value='{$k}'>{$fielddata[0]}</option>\r\n";
                }
            }
        ?>
        </select>
        <input type='submit' name='sb' value='确定' class="coolbg np" />
    </form>
</div>

$query = "SELECT * FROM {$diy->table} ORDER BY id DESC";

if(empty($keyword))
{
    $keyword = '';
    $addquery = '';
}
else
{
    $addquery = " WHERE {$field} LIKE '%".trim($keyword)."%' ";
}
$query = "SELECT * FROM {$diy->table} $addquery ORDER BY id DESC";

$datalist->SetParameter('diyid', $diyid);

$datalist->SetParameter('keyword', $keyword);
$datalist->SetParameter('field', $field);