How to convert mysql data into json format in php

php method to convert mysql data into json format: first mysql test database table, and create a new [testmysql.php] file to test; then use the database to execute the query statement; then put the data into the user object; Finally, use the [json_encode] function to convert the data into json format.

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php method to convert mysql data into json format:

1. First, mysql test database table

CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户编号',
  `login_name` varchar(50) NOT NULL COMMENT '用户名',
  `usable` int(11) NOT NULL DEFAULT '1' COMMENT '是否可用 0：不可用；1：可用',
  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `last_login_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '最后登录时间',
  PRIMARY KEY (`id`),
  UNIQUE KEY `login_name` (`login_name`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT='用户表';

2. Create a new testmysql.php file in the idea development tool to test

创建mysql连接
$link = mysql_connect('xxx:3306', 'root', 'xxx');
if (!$link) {
    echo "fail";
}

3. Select the database, execute the query statement, and $result receives the returned Data content

mysql_select_db("study");
$result = mysql_query("select * from t_user");

4. Define a user object

class User
{
   public $login_name;
   public $usable;
   public $create_time;
}

5. Loop through the data and put it into the user object

$data = array();
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
    $user = new User();
    $user->login_name = $row["login_name"];
    $user->usable = $row["usable"];
    $user->create_time = $row["create_time"];
    $data[] = $user;
}

6. Use the json_encode function to convert the array data into json format, and then echo to print it out.

$json = json_encode($data);echo "{" . '"user"' . ":" . $json . "}";

7. Right-click and select Run to see the console. After running, the results are printed

{"user":[{"login_name":"aa1","usable":"2","create_time":"2017-08-29 18:21:35"},{"login_name":"aa","usable":"1","create_time":"2017-08-29 18:22:30"}]}

The information is successfully read from mysql and converted into json format for printing

The complete sample code is as follows:

 
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