应用 SQL Server 2008 分页代码时数据表筛选器不起作用

Question

我已经设法使分页工作（感谢@zhorov），但不知何故它与搜索/过滤功能冲突。

尝试将每个查询放在每个$_post 中，以查看选择查询是否不会冲突，当我将第一个选择查询放在底部时，它将覆盖查询以进行分页。当我将分页查询放在顶部时，它不会显示任何内容。

这是我拥有的完整代码

`<?php

include('db.php');
include('function.php');
$query = '';
$output = array();
$query .= "SELECT * FROM users ";
if(isset($_POST["search"]["value"]))
{

    $query .= "WHERE emp_id LIKE '%".$_POST["search"]["value"]."%'  ";
    $query .= "OR id LIKE '%".$_POST["search"]["value"]."%'  ";

}
if(isset($_POST["order"]))
{
    $query .= "ORDER BY ".$_POST['order']['0']['column']." ".$_POST['order']['0']['dir']." ";
}
else
{
    $query .= "ORDER BY id DESC ";
}
if ($_POST["length"] != -1)
 {

     $query = "SELECT *
        FROM (
            SELECT 
                *, 
                ROW_NUMBER() OVER (ORDER BY id DESC) AS Rn
            FROM users )";
    $query .=         
        "sub WHERE  status = 'Active' AND Rn BETWEEN ".($_POST["start"])." AND ".($_POST["start"]  + $_POST["length"] - 1 );        
}

 $menu="";
$statement = $connection->prepare($query);
$statement->execute();
$result = $statement->fetchAll();
$data = array();
$filtered_rows = $statement->rowCount();
foreach($result as $row)
{

    $sub_array = array();
    $sub_array[] = $row['id'];
    $sub_array[] = $row['emp_id'];
    $sub_array[] = $row['username'];
    $sub_array[] = $row['password'];
    $sub_array[] = $row['email'];
    $sub_array[] = $row['firstname'];
    $sub_array[] = $row['middlename'];
    $sub_array[] = $row['lastname'];
    $sub_array[] = $row['location'];
    $sub_array[] = $row['contact_no'];
    $sub_array[] = $row['gender'];
    $sub_array[] = $row['access_type'];
    $sub_array[] = $row['status'];
    $sub_array[] = $row['date_reg'];    
        $sub_array[] = '<button type="button" name="update" id="'.$row["id"].'" class="btn btn-warning btn-xs update">Deactivate</button>';
    $data[] = $sub_array;
}
$output = array(
    "draw"              =>  intval($_POST["draw"]),
    "recordsTotal"      =>  $filtered_rows,
    "recordsFiltered"   =>  get_total_all_records(),
    "data"              =>  $data
);
echo json_encode($output);
?>`

分页和过滤器/搜索都应该工作。

Answer 1

这个答案可能为时已晚，但我认为下一个方法可能会有所帮助。您只需要将 WHERE 子句放在子查询中。

<?php

...
# WHERE clause
$where = "WHERE (status = 'Active') ";
if (isset($_POST["search"]["value"])) {
    $where .= " AND ((emp_id LIKE '%".$_POST["search"]["value"]."%') OR (id LIKE '%".$_POST["search"]["value"]."%')) ";
}

# Whole statement
if ($_POST["length"] != -1) {
     $query = "SELECT *
        FROM (
            SELECT 
                *, 
                ROW_NUMBER() OVER (ORDER BY id DESC) AS Rn
            FROM users ".$where." ) ";
    $query .=         
        "sub WHERE Rn BETWEEN ".($_POST["start"])." AND ".($_POST["start"]  + $_POST["length"] - 1 );        
}
if (isset($_POST["order"])) {
    $query .= " ORDER BY ".$_POST['order']['0']['column']." ".$_POST['order']['0']['dir']." ";
} else {
    $query .= " ORDER BY id DESC ";
}
...

?>

注意事项：

此示例基于您的代码。请注意，尽管您使用准备好的语句 ($connection->prepare($query))，但当您有用户输入时，必须使用参数来传递 prevent SQL injection。