JSON массив три таблицы mysql в PHP

Question

Я пытаюсь построить json-выход из трех связанных MySQL-таблиц. У меня есть таблица «термины», «term_relationships» и таблицы «posts» каждый элемент в таблице терминов имеет несколько относительных элементов в таблице «term_relationships», на которые ссылается «term_taxonomy_id». Каждый object_id является основным ключом в таблице сообщений в качестве идентификатора.

термины

term_relationships

+-----------+------------------+-----------+ 
| object_id | term_taxonomy_id | term_order| 
+-----------+------------------+-----------+ 
| 59  |  12   | 0  | 
| 57  |  12   | 0  | 
| 61  |  12   | 0  | 
| 62  |  13   | 0  | 
| 63  |  13   | 0  | 
+-----------+------------------+-----------+ 

сообщений

+---------+--------------+-----------------------+------------------------+ 
| ID  | post_author |  post_date  |  post_title  | 
+---------+--------------+-----------------------+------------------------+ 
| 59 |  8  | 2015.11.30 9.33.05 | Strerding silver  | 
| 57 |  8  | 2015.11.30 9.34.45 | London Blue   | 
| 61 |  8  | 2015.11.30 9.39.34 | Strerding silver Ame | 
| 62 |  9  | 2015.11.30 9.50.15 | Clean water   | 
| 63 |  9  | 2015.11.30 9.55.55 | 5 Liter water   | 
+---------+--------------+-----------------------+------------------------+ 

Я хотел бы созд Съел выход JSON из тех таблиц, выглядеть следующим образом:

{ 
    "category": [{ 
     "term_id": "12", 
     "name": "jewellery", 
     "slug": "jewellery", 
     "products": [{ 
      "ID": "59", 
      "post_title": "Strerding silver", 
      "post_date": "2015.11.30 9.33.05", 
      "post_author": "8" 
     }, { 
      "ID": "57", 
      "post_title": "London Blue", 
      "post_date": "2015.11.30 9.34.45", 
      "post_author": "8" 
     }] 
    }, { 

     "term_id": "13", 
     "name": "water", 
     "slug": "water", 
     "products": [{ 
      "ID": "62", 
      "post_title": "Clean water", 
      "post_date": "2015.11.30 9.50.15", 
      "post_author": "9" 
     }, { 
      "ID": "63", 
      "post_title": "5 Liter water", 
      "post_date": "2015.11.30 9.55.55", 
      "post_author": "9" 
     }] 
    }] 
} 

Я использую PHP и mysql_query методы, чтобы выяснить логику, Вот код, который я пытался до сих пор.

<?php 
    $username = "root"; 
    $password = ""; 
    $hostname = "localhost"; 

    $response = array(); 

    $dbhandle = mysql_connect($hostname, $username, $password) 
      or die("Unable to connect to MySQL"); 

    $selected = mysql_select_db("look4com_lk", $dbhandle) 
      or die("Could not select look4com_lk"); 

    //execute the SQL query and return records 
    $result = mysql_query("select * 
     from l4wlk_terms 
     INNER JOIN l4wlk_term_relationships 
     ON l4wlk_term_relationships.term_taxonomy_id = l4wlk_terms.term_id 
     INNER JOIN l4wlk_posts 
     ON l4wlk_term_relationships.object_id = l4wlk_posts.ID 
     ORDER BY l4wlk_terms.name"); 

    //$response["infos"] = array(); 
    $info["categorylist"] = array(); 

    while ($row = mysql_fetch_assoc($result)) { 
     $arr = array(); 
     $arr["name"] = $row["name"]; 
     $arr["term_id"] = $row["term_id"]; 
     $arr["post_date"] = $row["post_date"]; 
     $arr["post_title"] = $row["post_title"]; 
     $info[] = $arr; 
    } 
    echo json_encode($info); 
    //close the connection 
    mysql_close($dbhandle); 
?> 

Answer 1

В чистом SQL это будет очень трудно сделать. Используя PHP, вы можете это сделать. Вам нужно построить массив из набора результатов mysql в соответствии с вашими потребностями.

/* Building PreResult Set, form here we build the required result set */ 
    $info["categorylist"] = array(); 
    while ($row = mysql_fetch_assoc($result)) { 
     $info["categorylist"][$row["term_id"]]["name"] = $row["name"]; 
     $info["categorylist"][$row["term_id"]]["term_id"] = $row["term_id"]; 
     $info["categorylist"][$row["term_id"]]["slug"] = $row["slug"]; 
     $post = array(); 
     $post["id"] = $row["id"]; 
     $post["post_date"] = $row["post_date"]; 
     $post["post_title"] = $row["post_title"]; 
     $post["post_author"] = $row["post_author"]; 
     $info["categorylist"][$row["term_id"]]["products"][] = $post; 
    } 
    /* Building Actual Result Set from PreResult Set, This step required to remove all associative key is used before in PreSet to remove redundant data*/ 
    $json_data = array(); 
    foreach($info["categorylist"] as $key => $value){ 
     $products_array = array(); 
     foreach($value["products"] as $product_keys => $products){ 
      $products_array[] = $products; 
     } 
     $category = array(); 
     $category["name"] = $value["name"]; 
     $category["term_id"] = $row["term_id"]; 
     $category["slug"] = $row["slug"]; 
     $category["products"] = $products; 
     $json_data["categorylist"][] = $category; 
    } 
    echo '<pre>'.print_r($json_data,1).'</pre>'; 
    echo '<pre>'.json_encode($json_data).'</pre>'; 

Answer 2

Проверьте приведенный ниже код. удалите с //$response["infos"] = array(); по номеру echo json_encode($info); и вставьте этот код.

$values = array(); 
    while ($row = mysql_fetch_assoc($result)) { 
     // if term_id info not saved in the array, save it. 
     if (!isset($values[$row["term_id"]])) { 
      $values[$row["term_id"]] = array(
       'term_id' => $row["term_id"], 
       'name' => $row["name"], 
       'slug' => $row["slug"]); 
     } 
     // save products under term_id. 
     $values[$row["term_id"]]['products'][] = 
      array('ID' => $row["ID"], 'post_title' => $row["post_title"], 
       'post_date' => $row["post_date"], 'post_author' => $row["post_author"]); 
    } 
    // removing term_ids and adding all values to a array called 'category' 
    $return_array['category'] = array_values($values); 

    echo json_encode($return_array); 

Answer 3

PHP КОД

<?php 
    $username = "root"; 
    $password = ""; 
    $hostname = "localhost"; 

    $response = array(); 

    $dbhandle = mysql_connect($hostname, $username, $password) 
      or die("Unable to connect to MySQL"); 

    $selected = mysql_select_db("look4com_lk", $dbhandle) 
      or die("Could not select look4com_lk");  

    $result = mysql_query("select * 
     from l4wlk_terms 
     INNER JOIN l4wlk_term_relationships 
     ON l4wlk_term_relationships.term_taxonomy_id = l4wlk_terms.term_id GROUP BY l4wlk_terms.term_id   
     ORDER BY l4wlk_terms.name"); 

    while ($row = mysql_fetch_assoc($result)) { 
     $arr = array();   
     $arr["term_id"] = $row["term_id"]; 
     $arr["name"] = $row["name"]; 
     $arr["slug"] = $row["slug"]; 

     $result1 = mysql_query("select * 
     from l4wlk_term_relationships 
     INNER JOIN l4wlk_posts 
     ON l4wlk_term_relationships.object_id = l4wlk_posts.ID WHERE l4wlk_term_relationships.term_taxonomy_id = '".$arr["term_id"]."'"); 
     while ($row1 = mysql_fetch_assoc($result1)) { 
      $arr1 = array(); 
      $arr1["ID"] = $row1["ID"]; 
      $arr1["post_title"] = $row1["post_title"]; 
      $arr1["post_date"] = $row1["post_date"]; 
      $arr1["post_author"] = $row1["post_author"]; 
      $arr["products"][] = $arr1; 
     } 

     $info["category"][] = $arr; 
    } 
    echo json_encode($info); 
    //close the connection 
    mysql_close($dbhandle); 
?> 

SQL DUMP

-- 
-- Database: `look4com_lk` 
-- 
-- 
-- Table structure for table `l4wlk_posts` 
-- 

CREATE TABLE IF NOT EXISTS `l4wlk_posts` (
    `ID` int(11) unsigned NOT NULL, 
    `post_author` int(11) unsigned NOT NULL, 
    `post_date` datetime(6) NOT NULL, 
    `post_title` varchar(250) NOT NULL, 
    UNIQUE KEY `ID_2` (`ID`), 
    KEY `ID` (`ID`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 

-- 
-- Dumping data for table `l4wlk_posts` 
-- 

INSERT INTO `l4wlk_posts` (`ID`, `post_author`, `post_date`, `post_title`) VALUES 
(57, 8, '2015-11-30 09:34:45.000000', 'London Blue'), 
(59, 8, '2015-11-30 09:33:05.000000', 'Strerding silver'), 
(61, 8, '2015-11-30 09:39:34.000000', 'Strerding silver Ame'), 
(62, 9, '2015-11-30 09:50:15.000000', 'Clean water'), 
(63, 9, '2015-11-30 09:55:55.000000', '5 Liter water'); 

-- -------------------------------------------------------- 

-- 
-- Table structure for table `l4wlk_terms` 
-- 

CREATE TABLE IF NOT EXISTS `l4wlk_terms` (
    `term_id` int(11) unsigned NOT NULL AUTO_INCREMENT, 
    `name` varchar(250) NOT NULL, 
    `slug` varchar(250) NOT NULL, 
    `term_group` varchar(250) NOT NULL, 
    PRIMARY KEY (`term_id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=14 ; 

-- 
-- Dumping data for table `l4wlk_terms` 
-- 

INSERT INTO `l4wlk_terms` (`term_id`, `name`, `slug`, `term_group`) VALUES 
(12, 'jewellery', 'jewellery', '0'), 
(13, 'water', 'water', '0'); 

-- -------------------------------------------------------- 

-- 
-- Table structure for table `l4wlk_term_relationships` 
-- 

CREATE TABLE IF NOT EXISTS `l4wlk_term_relationships` (
    `id` int(11) unsigned NOT NULL AUTO_INCREMENT, 
    `object_id` int(11) unsigned NOT NULL, 
    `term_taxonomy_id` int(11) unsigned NOT NULL, 
    `term_order` int(11) unsigned NOT NULL, 
    PRIMARY KEY (`id`), 
    KEY `object_id` (`object_id`), 
    KEY `term_taxonomy_id` (`term_taxonomy_id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ; 

-- 
-- Dumping data for table `l4wlk_term_relationships` 
-- 

INSERT INTO `l4wlk_term_relationships` (`id`, `object_id`, `term_taxonomy_id`, `term_order`) VALUES 
(1, 59, 12, 0), 
(2, 57, 12, 0), 
(3, 61, 12, 0), 
(4, 62, 13, 0), 
(5, 63, 13, 0); 

-- 
-- Constraints for dumped tables 
-- 

-- 
-- Constraints for table `l4wlk_term_relationships` 
-- 
ALTER TABLE `l4wlk_term_relationships` 
    ADD CONSTRAINT `l4wlk_term_relationships_c1` FOREIGN KEY (`object_id`) REFERENCES `l4wlk_posts` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE, 
    ADD CONSTRAINT `l4wlk_term_relationships_c2` FOREIGN KEY (`term_taxonomy_id`) REFERENCES `l4wlk_terms` (`term_id`) ON DELETE CASCADE ON UPDATE CASCADE;