[英]import CSV file into mysql database using nodejs
我正在嘗試使用nodejs將CSV文件上傳到MySQL數據庫......它工作成功並添加了行,但它給了我一個錯誤。 這是我的代碼:
//use express static folder
app.use(express.static("./public"))
// body-parser middleware use
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({
extended: true
}))
db.connect(function (err) {
if (err) {
return console.error('error: ' + err.message);
}
console.log('Connected to the MySQL server.');
})
//! Use of Multer
var storage = multer.diskStorage({
destination: (req, file, callBack) => {
callBack(null, './uploads/')
},
filename: (req, file, callBack) => {
callBack(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname))
}
})
var upload = multer({
storage: storage
});
//! Routes start
//route for Home page
app.get('/', (req, res) => {
res.sendFile(__dirname + '/index.html');
});
// upload csv to database
app.post('/uploadfile', upload.single("uploadfile"), (req, res) =>{
UploadCsvDataToMySQL(__dirname + '/uploads/' + req.file.filename);
console.log('CSV file data has been uploaded in mysql database ' + err);
});
function UploadCsvDataToMySQL(filePath){
let stream = fs.createReadStream(filePath);
let csvData = [];
let csvStream = csv
.parse()
.on("data", function (data) {
csvData.push(data);
})
.on("end", function () {
// Remove Header ROW
csvData.shift();
// Open the MySQL connection
db.connect((error) => {
if (error) {
console.error(error);
} else {
let query = 'INSERT INTO files (File_ID, File_Name) VALUES ?';
db.query(query, [csvData], (error, response) => {
console.log(error || response);
});
}
});
// delete file after saving to MySQL database
// -> you can comment the statement to see the uploaded CSV file.
fs.unlinkSync(filePath)
});
stream.pipe(csvStream);
}
//create connection
const PORT = process.env.PORT || 8000
app.listen(PORT, () => console.log(`Server is running at port ${PORT}`))
這是文件上傳后 PowerShell 中出現的錯誤:
ReferenceError: err 未在 C:\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\index.js:79:72 在 Layer.handle [as handle_request] (C:\Users\DELL\Desktop\Advanced\AdvancedSeE \dbmanager\node_modules\express\lib\router\layer.js:95:5) 在下一個 (C:\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\node_modules\express\lib\router\route.js:137 :13) 在陣列。 (C:\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\node_modules\multer\lib\make-middleware.js:53:37) 在監聽器 (C:\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\ node_modules\on-finished\index.js:169:15) 在 onFinish (C:\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\node_modules\on-finished\index.js:100:5) 在回調 (C :\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\node_modules\ee-first\index.js:55:10) 在 IncomingMessage.onevent (C:\Users\DELL\Desktop\Advanced\AdvancedSeE\dbmanager\node_modules\ ee-first\index.js:93:5) 在 IncomingMessage.emit (node:events:341:22) at endReadableNT (node:internal/streams/readable:1294:12) ResultSetHeader { fieldCount: 0, affectedRows: 3, insertId:33333,信息:'記錄:3 重復:0 警告:0',serverStatus:2,warningStatus:0 }
在以下區域中,您在控制台日志中添加了文件中未定義的err
// upload csv to database
app.post('/uploadfile', upload.single("uploadfile"), (req, res) =>{
UploadCsvDataToMySQL(__dirname + '/uploads/' + req.file.filename);
console.log('CSV file data has been uploaded in mysql database ' + err); //<----- here err is not defined
});
只需刪除它並嘗試問題是否解決
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