Update Table

var mysql = require('mysql');

var con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  var sql = "UPDATE customers SET address = 'Canyon 123' WHERE address = 'Valley 345'";
  con.query(sql, function (err, result) {
    if (err) throw err;
    console.log(result.affectedRows + " record(s) updated");
  });
});

C:\Users\Your Name>node demo_db_update.js

1 record(s) updated

UPDATE 구문은 WHERE문이 함께 사용되지 않으면 매우 위험합니다.

The Result Object

{
  fieldCount: 0,
  affectedRows: 1,
  insertId: 0,
  serverStatus: 34,
  warningCount: 0,
  message: '(Rows matched: 1 Changed: 1 Warnings: 0',
  protocol41: true,
  changedRows: 1
}

console.log(result.affectedRows)

1