[英]Generating JSON Query Result in Codeigniter
So i have database table named usermeta and have table structure like this : 所以我有一个名为usermeta的数据库表,并且具有这样的表结构:
-----------------------------------------------------------
| ummeta_id | user_id | meta_key | meta_value |
-----------------------------------------------------------
| 1 | 1 | fullname | John Doe |
| 2 | 1 | birthplace | New York |
| 3 | 1 | birthdate | 1990/01/01 |
| 4 | 1 | mobile | 0812-3456-7890 |
| 5 | 1 | email | john.doe@mail.com |
| 6 | 2 | fullname | Jon Wick |
| 7 | 2 | birthplace | Washington DC |
| 8 | 2 | birthdate | 1985/10/21 |
| 9 | 2 | mobile | 0890-1234-5678 |
| 10 | 2 | email | wickjohn@mail.com |
And i try to generate json data for all data from this database using Codeigniter (v 3.1.9) using Controller and Model. 我尝试使用Controller和Model使用Codeigniter(v 3.1.9)从该数据库生成所有数据的json数据。
This is my Model (model name: db_usermeta) 这是我的模型 (模型名称:db_usermeta)
function userslist()
{
$query = $this->db->select('*')
->from('usermeta')
->get();
return $query->result();
}
This is my Controller 这是我的控制器
public function userlist()
{
header('Content-Type: application/json; charset=utf-8');
$query = $this->db_usermeta->userslist();
$json_data = array();
foreach ($query as $key)
{
$json_data[$key->meta_key] = $key->meta_value;
}
echo json_encode($json_data);
}
The result when i open using my browser to check the json data using web developer tool is only show last record, in this case only show data from user_id 2, like this: 当我使用浏览器打开浏览器以使用Web Developer工具检查json数据时,结果仅显示最后一条记录,在这种情况下,仅显示user_id 2中的数据,如下所示:
{
"fullname":"John Wick",
"birthplace":"Washinton DC",
"birthdate":"1985/10/21",
"mobile":"0890-1234-5678",
"email":"wickjohn@mail.com"
}
What I want to achieve is to show all json data nested like this: 我想要实现的是显示嵌套的所有json数据,如下所示:
"data": [
{
"fullname":"John Doe",
"birthplace":"New York",
"birthdate":"1990/01/01",
"mobile":"0812-3456-7890",
"email":"john.doe@mail.com"
},
{
"fullname":"John Wick",
"birthplace":"Washinton DC",
"birthdate":"1985/10/21",
"mobile":"0890-1234-5678",
"email":"wickjohn@mail.com"
}
]
How can i achieve this? 我怎样才能做到这一点? Did I make a mistake on my controller and model.
我在控制器和模型上犯了错误吗? I really appreciate your help.
非常感谢您的帮助。
Since the meta key fullname
is same for both records, you need to change the key name to something unique 由于两个记录的元密钥
fullname
都相同,因此您需要将密钥名更改为唯一的名称
foreach ($query as $key)
{
$json_data[$key->meta_key] = $key->meta_value;
}
Change $json_data[$key->meta_key]
to $json_data[$key->meta_key.$key->user_id]
or simply change it to $json_data[$key->ummeta_id]
将
$json_data[$key->meta_key]
更改$json_data[$key->meta_key]
$json_data[$key->meta_key.$key->user_id]
或将其更改为$json_data[$key->ummeta_id]
your $key->meta_key
is overwriting for every record. 您的
$key->meta_key
将为每条记录覆盖。 that's why only last record appeared. 这就是为什么只有最后一条记录出现的原因。 You don't actually need to loop through to get json data.
实际上,您不需要遍历即可获取json数据。
public function userlist()
{
header('Content-Type: application/json; charset=utf-8');
$query = $this->db_usermeta->userslist();
$json_data = array(array());
$user_id_map = array();
$index = 0;
foreach ($query as $key)
{
if(!isset($user_id_map[$key->user_id])){
$user_id_map[$key->user_id] = $index++;
}
$currentIndex = $user_id_map[$key->user_id];
$json_data[$currentIndex][$key->meta_key] = $key->meta_value;
}
echo json_encode($json_data);
}
just change your controller code to this and this will return json data. 只需将您的控制器代码更改为此,这将返回json数据。
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