大家好，
請問我已取得資料庫的資料，
我該如何將資料傳給前端?

const connectFunction = (query) => {
    connection.query(query, (error, results, fields) => {
        if (error) throw error
        //抓不到這個 JSON.parse(JSON.stringify(results))
        return JSON.parse(JSON.stringify(results))
    })
    connection.end(function (error) {
        if (error) throw error
    });
}

const read = ()=>{
    let query ='.......'
     return connectFunction(query)
}

//這是graphql的
const root = {
    users: () => {
        //console.log(read())是undified
        return read()
    }
}

---------更新--------------
謝謝，我將connectFunction改成 Promise，就成功了。

const connectFunction = (query) => {
    return new Promise(resolve => {
        const connection = mysql.createConnection({
            // connectionLimit: 1000,
            host: 'localhost',
            user: 'root',
            password: '',
            database: 'graphql'
        })
        connection.query(query, (error, results, fields) => {
            if (error) throw error
            resolve(JSON.parse(JSON.stringify(results)))
        })
        connection.end(function (error) {
            if (error) throw error
        });
    })
}

const read = async()=>{
    let query ='.......'
    return await connectFunction(query)
}

const root = {
    users: () => read()
}