nodejs（MYSQL）中的更新和設置問題

Question

我正在嘗試使用 node.js 將數據庫上的狀態更新為 1

這是我的代碼

app.post('/voted', (req, res) => {
    const email = req.body.email
    const num = 1;

    db.query("UPDATE voter SET status = ? WHERE email = ?",
    [num, email],
    (err, result) => {
        if(err) {
            console.log(err)
        } else {
            res.send( {voted: true } )
            console.log(result)
        }
    })
})

我得到的 console.log：

OkPacket {
  fieldCount: 0,
  affectedRows: 0,
  insertId: 0,
  serverStatus: 2,
  warningCount: 0,
  message: '(Rows matched: 0  Changed: 0  Warnings: 0',
  protocol41: true,
  changedRows: 0
}

這是我的 SQL 結構

我試圖修改的數據

idk 我的 go 哪里錯了，我的 SQL 結構不正確嗎？

--- 更新 --- 我發現了問題，似乎我必須在查詢正確注冊之前雙擊按鈕

// First Click
OkPacket {
  fieldCount: 0,
  affectedRows: 0,
  insertId: 0,
  serverStatus: 2,
  warningCount: 0,
  message: '(Rows matched: 0  Changed: 0  Warnings: 0',
  protocol41: true,
  changedRows: 0
} // 2nd Click
OkPacket {
  fieldCount: 0,
  affectedRows: 1,
  insertId: 0,
  serverStatus: 2,
  warningCount: 0,
  message: '(Rows matched: 1  Changed: 1  Warnings: 0',
  protocol41: true,
  changedRows: 1
}

我認為問題出在我的 handleStatus function

    const [userEmail, setEmail] = useState('')
    const handleStatus = () => {
        
        Axios.get("http://localhost:3001/login").then((response) => {
            if (response.data.loggedIn === true) {
                setEmail(response.data.user[0].email)
            }
        })

        Axios.post('http://localhost:3001/voted', 
        {email: userEmail}).then((response) => {
            console.log(response)
        })
    }
    ```

Answer 1

您可以嘗試使用此代碼嗎？

const syncSql = require('sync-sql');
const email = req.body.email
const num = 1;

const con = {
    host: process.env.DB_HOST,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME
};

const query = `UPDATE voter SET status = ? WHERE email = ?`
const data = { status: num, email }

const response = syncSql.mysql(con, query, data)

如果您使用的是本地數據庫，那么

1. DB_HOST = "本地主機"
2. DB_USER = "根"
3. DB_PASSWORD = ""

Answer 2

UPDATE，謝謝大家的回答我已經找到了問題

我做了這個

const [userEmail, setEmail] = useState('')

    useEffect(() => {
        Axios.get("http://localhost:3001/login").then((response) => {
            if (response.data.loggedIn === true) {
                setEmail(response.data.user[0].email)
            }
        })
    }, [])

    const handleStatus = () => {
        
        Axios.post('http://localhost:3001/voted', 
        {email: userEmail}).then((response) => {
            console.log(response)
        })
    }

而不是這個

  const [userEmail, setEmail] = useState('')
    const handleStatus = () => {
        
        Axios.get("http://localhost:3001/login").then((response) => {
            if (response.data.loggedIn === true) {
                setEmail(response.data.user[0].email)
            }
        })

        Axios.post('http://localhost:3001/voted', 
        {email: userEmail}).then((response) => {
            console.log(response)
        })
    }