如何使用下拉选项过滤数据

Question

我尝试使用dropdown选项过滤一些数据。当用户选择年/分部并单击筛选按钮时，它假定从数据库中读取包含该值的所有行。这是我所能做到的最远的地方，但它没有起作用。真的希望有人能帮助我。

 if (isset($_GET['do']))
{
    if($_GET['do'] == 'filter')
    {
        if( empty($_POST['key_year']))
        {
            redirect("list.php");
        }
        else
        {   
            $_SESSION['key_year'] = $_POST['key_year'];         
            $_SESSION['key_division'] = $_POST['key_division'];         
        }
    }
    else if($_GET['do'] == 'clear')
    {
        unset($_SESSION['key_year']);
        redirect("list.php");
    }
    else
    {}  
}
$limit = 10;    
$page = ( isset($_GET['page']) ) ? $_GET['page'] : 1;   
$end = ( isset($_GET['page']) ) ? ($limit * $_GET['page']) : $limit;
$offset = ( isset($_GET['page']) ) ? ($limit * $_GET['page']) - $limit : 0;
$start = $offset +1;
$next = $page + 1;
$prev = $page - 1;
$key_year = ( isset($_SESSION['key_year']) ) ? $_SESSION['key_year'] : '';
$key_year = ( isset($_SESSION['key_division']) ) ? $_SESSION['key_division'] : '';

$sql  = "SELECT * FROM tbl_perfomance ";
$sql .= "ORDER BY `p_aid` ASC";
$sql .= " LIMIT $offset, $limit";
$rs = mysql_query($sql);

$sql2="SELECT COUNT(p_aid) AS total FROM tbl_perfomance ";
if(isset($key_year) && isset($key_division))
{
    $sql2 .= "WHERE p_year LIKE '%$key_year%' AND p_division LIKE '%$key_division%'";
}
$rs2=mysql_query($sql2);
$getRec = mysql_fetch_assoc($rs2);
//total
$rowCount=$getRec['total'];
$end = ($end > $rowCount) ? $rowCount : $end;
$total_page = ceil($rowCount/$limit);

$for_start = ( $page <= 2 ) ? 1 : $page - 2;
$for_stop_tmp = $page + 2;
$for_stop  = ( $for_stop_tmp > $total_page ) ? $total_page : $page + 2; 

这是表格。

            <form name="filter" action="list.php?do=filter" method="GET">
                    </label>
                    <label style="color:darkgreen;float:left;width:11%" align="left">
                        Division
                        <select name="key_division">
                            <option value="All">All</option>
                            <option value="ITNT">ITNT</option>
                           <option value="ITP">ITP</option>
                        </select>
                    </label>     -->                
                    <label style="color:darkgreen;float:left;width:11%" align="left">                           
                        Year        
                        <select name="key_year">
                            <option value="all">All</option>
                            <option value="2014">2014</option>
                            <option value="2015">2015</option>
                        </select>
                    </label>
                    <label style="color:darkgreen;float:left;width:11%" align="left">
                    </label><br>
                        <input class="button_green" type="submit" value="Filter &raquo;" /> 

            </form> 

Answer 1

我觉得您只是为分页sql添加条件，而不是为内容sql添加条件

试着像这样修改你的代码，这样你就有了合适的$sql1和$sql2。

$sql  = "SELECT * FROM tbl_perfomance ";

$sql2="SELECT COUNT(p_aid) AS total FROM tbl_perfomance ";
if(isset($key_year) && isset($key_division))
{
    $sql2 .= "WHERE p_year LIKE '%$key_year%' AND p_division LIKE '%$key_division%'";
    $sql1 .= "WHERE p_year LIKE '%$key_year%' AND p_division LIKE '%$key_division%'";
}

$sql .= "ORDER BY `p_aid` ASC";
$sql .= " LIMIT $offset, $limit";
$rs = mysql_query($sql);

$rs2=mysql_query($sql2);
$getRec = mysql_fetch_assoc($rs2);

完成后，回显这两个查询，并直接在php、myadmin或任何其他mysql工具中运行它们，以检查它们是否正常工作。