Question

我希望准备JSON数据并发送到由devbridge生成的jquery自动完成，它希望数据格式为此方案：

{
    "suggestions": [
        { "value": "United Arab Emirates", "data": "AE" },
        { "value": "United Kingdom",       "data": "UK" },
        { "value": "United States",        "data": "US" }
    ]
}

所以我试图从数据库中获取数据并放入数组。

<?php
include '../core/config.php';
include '../core/db.class.php';

$DB->query("SELECT * FROM `prodotti`;");
$prodotti = $DB->fetchAll();

class json_prodotti {
    public $suggestions = '';
}
class json_suggestions {
    public $value = '';
    public $data = '';
    public $price = '';
}

$j = new json_prodotti;
$s = new json_suggestions;
$a = array();

foreach ($prodotti as $prd ) {
    $s->value = $prd['name'];
    $s->data  = $prd['ID'];
    $s->price = $prd['price'];
    array_push($a,$s);
}


$j->suggestions = $a;


echo json_encode($j);

?>

正如您所看到的，我正在使用数据库类，这项工作正如预期的那样，我在项目的其他部分使用它。这是调用fetchAll（）函数来获取数据，__ construct正常工作。

public function fetchAll(){
    $this->execute();
    return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
}

问题：

我的代码出了问题，我按预期获得了JSON，但是foreach循环重复了与数据库中的行数相同的数据库行。 EG：

{
 "suggestions":[
    {"value":"Item 4","data":"6","price":"0.48"},
    {"value":"Item 4","data":"6","price":"0.48"},
    {"value":"Item 4","data":"6","price":"0.48"},
    {"value":"Item 4","data":"6","price":"0.48"}
]}

Answer 1

每次只需创建一个新建议：

$j = new json_prodotti;
$a = array();

foreach ($prodotti as $prd ) {
    $s = new json_suggestions;
    $s->value = $prd['name'];
    $s->data  = $prd['ID'];
    $s->price = $prd['price'];
    array_push($a,$s);
}

否则你正在修改同一个对象...这就是为什么在json_encode中你得到所有建议的相同值...你多次添加相同的建议......

PHP：从数据库

1 个答案: