有问题的网址查询

Question

我有这个 php 脚本，它给了我一个 json 响应。

 <?php 
    include("init.php");
    $string="";
    $newString="";
    $get_posts = "select * from books_table";       
    $run_posts = mysqli_query($con,$get_posts);     
    $posts_array = array(); 
    while ($posts_row = mysqli_fetch_array($run_posts)){
        $row_array['title'] = $posts_row['title'];
        $row_array['author'] = $posts_row['author'];
        $row_array['bookUrl'] = $posts_row['bookUrl'];
        $row_array['imageUrl'] = $posts_row['imageUrl'];
        $row_array['displayDate'] = $posts_row['displayDate'];
        $row_array['numberOfPages'] = $posts_row['numberOfPages'];
        array_push($posts_array,$row_array);            
     }     
       $string = json_encode($posts_array,JSON_UNESCAPED_UNICODE);
       echo $string;?>

我得到的 json

[{"title":"Clean Code","author":"Robert Martin","bookUrl":"http:\/\/amzn.to\/1DJybxH","imageUrl":"http:\/\/adavis.github.io\/adept-android\/images\/clean_code.jpg\"","displayDate":"August 11, 2008","numberOfPages":"464"},{"title":"Effective Java","author":"Joshua Bloch","bookUrl":"http:\/\/amzn.to\/1Ku8Xel","imageUrl":"http:\/\/adavis.github.io\/adept-android\/images\/effective_java.jpg","displayDate":"May 28, 2008","numberOfPages":"346"},{"title":"Working Effectively with Legacy Code","author":"Michael Feathers","bookUrl":"http:\/\/amzn.to\/1Jqe1PA","imageUrl":"http:\/\/adavis.github.io\/adept-android\/images\/legacy_code.jpg","displayDate":"October 2, 2004","numberOfPages":"456"},{"title":"Refactoring: Improving the Design of Existing Code","author":"Martin Fowler","bookUrl":"http:\/\/amzn.to\/1Lx4cjR","imageUrl":"http:\/\/adavis.github.io\/adept-android\/images\/refactoring.jpg","displayDate":"July 8, 1999","numberOfPages":"464"}]

我想执行一个查询，该查询将返回标题包含单词 clean 的对象。

所以我正在使用这个网址

[http://www.theo-android.co.uk/books/sample_data.php/q=clean][1]

但是，我得到了和以前一样的 json 响应。不会过滤掉一个或多个对象。为什么会这样？

谢谢，

西奥。

Answer 1

如果我理解正确，您希望sample_data.php 能够返回过滤后的数据？ 首先，您需要更新sample_data.php 来处理q 参数（我会将它用作GET，因为它更简单：http://www.theo-android.co.uk/books/sample_data.php?q=clean

<?php 
include("init.php");
$string="";
$newString="";
$query = mysqli_real_escape_string($con,$_GET['q']); // get and escape the q param
$get_posts = "select * from books_table"; 
if($query != '') $get_posts .= " WHERE title LIKE '%{$query}%'"; // if $query is not empty string - query using a wild card
$run_posts = mysqli_query($con,$get_posts);     
$posts_array = array(); 
while ($posts_row = mysqli_fetch_array($run_posts)){
    $row_array['title'] = $posts_row['title'];
    $row_array['author'] = $posts_row['author'];
    $row_array['bookUrl'] = $posts_row['bookUrl'];
    $row_array['imageUrl'] = $posts_row['imageUrl'];
    $row_array['displayDate'] = $posts_row['displayDate'];
    $row_array['numberOfPages'] = $posts_row['numberOfPages'];
    array_push($posts_array,$row_array);            
 }     
   $string = json_encode($posts_array,JSON_UNESCAPED_UNICODE);
   echo $string;?>

这样$posts_row就只有相关书籍了

--添加----

按 id 显示图书 json

http://www.theo-android.co.uk/books/sample_data.php?id=1

<?php 
include("init.php");
$string="";
$newString="";
$query = mysqli_real_escape_string($con,$_GET['q']); // get and escape the q param
$id = (int)$_GET['id']; // get and cast to int the id var from GET
$where_cond = array();
$get_posts = "select * from books_table"; 
if($query != '') $where_cond[] = " title LIKE '%{$query}%'"; // if $query is not empty string - query using a wild card
if($id > 0) $where_cond[] = " id = {$id}"; // if $id is a number
if(!empty($where_cond)) $get_posts .= " WHERE " . implode(" AND ",$where_cond);
$run_posts = mysqli_query($con,$get_posts);     
$posts_array = array(); 
while ($posts_row = mysqli_fetch_array($run_posts)){
    $row_array['title'] = $posts_row['title'];
    $row_array['author'] = $posts_row['author'];
    $row_array['bookUrl'] = $posts_row['bookUrl'];
    $row_array['imageUrl'] = $posts_row['imageUrl'];
    $row_array['displayDate'] = $posts_row['displayDate'];
    $row_array['numberOfPages'] = $posts_row['numberOfPages'];
    array_push($posts_array,$row_array);            
 }     
   $string = json_encode($posts_array,JSON_UNESCAPED_UNICODE);
   echo $string;?>

因为您希望它同时适用于 id 和 q（以及其中一个），所以我将每个条件插入到数组中，然后使用 AND 分隔符将其内爆

它未经测试。