如何将 json 数据添加到 node.js 中的 mysql 数据库

Question

I am to get the json data from http://jsonplaceholder.typicode.com/users

I want to populate the mysql database with the id,name,username and email from the json data. I am using a node module called 'request' to read the online json api

const db = mysql.createConnection({
   host: 'localhost',
   user: 'root',
   password: '',
   database: 'nodemysql'
});
connect
db.connect((err) => {
   if (err) {
       throw err
   }
   console.log('MySql Connected...');

});
app.get('/populate', (req, res) => {
   request({
       url: "http://jsonplaceholder.typicode.com/users",
       json: true
   }, (err, res, body) => {
       res.send(body);
   });
})

Here's a two samples of the items in the json api

  {
    "id": 1,
    "name": "Leanne Graham",
    "username": "Bret",
    "email": "Sincere@april.biz",
    "address": {
      "street": "Kulas Light",
      "suite": "Apt. 556",
      "city": "Gwenborough",
      "zipcode": "92998-3874",
      "geo": {
        "lat": "-37.3159",
        "lng": "81.1496"
      }
    },
    "phone": "1-770-736-8031 x56442",
    "website": "hildegard.org",
    "company": {
      "name": "Romaguera-Crona",
      "catchPhrase": "Multi-layered client-server neural-net",
      "bs": "harness real-time e-markets"
    }
  },
  {
    "id": 2,
    "name": "Ervin Howell",
    "username": "Antonette",
    "email": "Shanna@melissa.tv",
    "address": {
      "street": "Victor Plains",
      "suite": "Suite 879",
      "city": "Wisokyburgh",
      "zipcode": "90566-7771",
      "geo": {
        "lat": "-43.9509",
        "lng": "-34.4618"
      }
    },
    "phone": "010-692-6593 x09125",
    "website": "anastasia.net",
    "company": {
      "name": "Deckow-Crist",
      "catchPhrase": "Proactive didactic contingency",
      "bs": "synergize scalable supply-chains"
    }
  }

I just need the id,name,username and email to be added the mysql database as columns for each user as rows

Answer 1

Assuming that

yes it is version 10.4.11 – Preshy Jones

means you have MariaDB:

SELECT idx + 1, 
       JSON_VALUE(single_object, '$.id') id,
       JSON_VALUE(single_object, '$.name') name,
       JSON_VALUE(single_object, '$.username') username,
       JSON_VALUE(single_object, '$.email') email
FROM ( SELECT idx, JSON_EXTRACT(@json, CONCAT('$[', idx, ']')) single_object
       FROM ( SELECT 0 idx UNION SELECT 1 UNION SELECT 2) idxs ) objects
HAVING id;

fiddle

Pay attention - separate JSON objects are transferred into the query as JSON array, not as JSON object.

The number of consecutive numbers in the 'idxs' subquery must start from zero and contain at least as many numbers as the number of individual objects in the source data. If not, the remaining rows will be lost. This subquery may be easily replaced with numberlist-generated recursive CTE.