英文:
Tell me a fix for ER_BAD_NULL_ERROR in Node.js, mysql crud operation
问题
我是Node.js的绝对新手。所以，在学习过程中，我遇到了这个问题。
我正在为CRUD从后端添加代码（这个index.js可能看起来不完整，因为我在中途遇到了问题，然后开始寻找解决方案。）
package.json
{
"name": "backend",
"version": "1.0.0",
"description": "",
"main": "index.js",
"type": "module",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "nodemon index.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.18.2",
"mysql": "^2.18.1",
"nodemon": "^2.0.20"
}
}
index.js
import express from 'express';
import mysql from "mysql";
const app = express();
const db = mysql.createConnection({
host: "localhost",
user: "root",
password: "akdkfjdkfj;a",
database: "online_sustainability_db"
});
app.use(express.json());
app.get("/", (req, res) =>{
res.json("Hello. You are connected to backend.");
});
app.get("/data", (req, res) =>{
const query = "SELECT * FROM online_sustainability_db.idea_proposers";
db.query(query, (err, data)=>{
if(err)
return res.json(err);
else
return res.json(data);
})
});
app.post("/data", (req, res)=>{
const q = "INSERT INTO idea_proposers (`last_name`, `first_name`, `account_no`, `github_repository_link`, `submission_id`) VALUES (?, ?, ?, ?, ?)";
const last_name = req.body.last_name;
const first_name = req.body.first_name;
const account_no = req.body.account_no;
const github_link = req.body.github_repository_link;
const submission_id = req.body.submission_id;
db.query(q, [last_name, first_name, account_no, github_link, submission_id], (err, data)=>{
if(err)
return res.json(err);
else
return res.json("Provided data were recorded successfully.");
});
});
app.listen(8800, ()=>{
console.log("Connected to backend!");
});
以下图片来自Postman应用程序。这是我遇到的错误。请帮助我修复它。
这是我试图在其中发布数据的表的描述。
我尝试了一些语法更改并多次运行代码。好吧，它没有起作用。我甚至在网上搜索了一些资源，但找不到类似的内容。
英文:
I am an absolute novice at Node.js. So, as I'm learning, I ran into this problem.
I am adding codes from backend for CRUD (This index.js may seem incomplete, because I faced the problem halfway and then started seeking the solution.)
package.json
{
"name": "backend",
"version": "1.0.0",
"description": "",
"main": "index.js",
"type": "module",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "nodemon index.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.18.2",
"mysql": "^2.18.1",
"nodemon": "^2.0.20"
}
}
index.js
import express from 'express';
import mysql from "mysql";
const app = express();
const db = mysql.createConnection({
host: "localhost",
user: "root",
password: "akdkfjdkfj;a",
database: "online_sustainability_db"
});
app.use(express.json());
app.get("/", (req, res) =>{
res.json("Hello. You are connected to backend.");
});
app.get("/data", (req, res) =>{
const query = "SELECT * FROM online_sustainability_db.idea_proposers";
db.query(query, (err, data)=>{
if(err)
return res.json(err);
else
return res.json(data);
})
});
app.post("/data", (req, res)=>{
const q = "INSERT INTO idea_proposers (`last_name`, `first_name`, `account_no`, `github_repository_link`, `submission_id`) VALUES (?, ?, ?, ?, ?)";
const last_name = req.body.last_name;
const first_name = req.body.first_name;
const account_no = req.body.account_no;
const github_link = req.body.github_repository_link;
const submission_id = req.body.submission_id;
db.query(q, [last_name, first_name, account_no, github_link, submission_id], (err, data)=>{
if(err)
return res.json(err);
else
return res.json("Provided data were recorded successfully.");
});
});
app.listen(8800, ()=>{
console.log("Connected to backend!");
});
The following image is from postman application. This is the error I am getting. Please, help me fixing it.
This is the description of the table I am trying to post the data in.
I tried doing some syntactical change and running the code several times. Well, it didn't work. I even looked for resources online, but I couldn't find any similar.
答案1
得分: 1
请在需要发送JSON数据时从Postman中选择JSON。目前，您正在将数据发送为文本。
英文:
Kindly select the JSON from Postman whenever you want to send the JSON data. currently, you're sending data as a text.
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