测试所有已终止的功能

Question

I am developing a synchronizer between two databases ( SQL Server and MySQL ) with ElectronJS and Node.JS and everything is working fine, but I would like to execute the window.close() method to terminate the application when all tables are syncronized (which are done asynchronously within a for loop).

 // I removed error and bank connection treatments because they are working // Read json file that contains all tables and its columns (keys) fs.readFile(ABSPATH + 'tables.json', 'utf8', async (err,json) => { // Parse the content of the file into a JSON object let vetor = JSON.parse(json) // Foreach table for (let i = 0; i < vetor.length; i++) { // Read the table from SQL Server and save it falues into MySQL await read(vetor[i].table,vetor[i].keys) } // Instead of closing, I'm just displaying this message on screen (for debugging) document.body.innerHTML += "<h2>All data where inserted</h2>" }) 

But as you can see, it is returning the final result before returning the functions, that is, they remain asynchronous:

Click here to see the image

I believe my error is at the time of saving the data in the following function because I tested it with console.log() , but I still can't make it synchronous:

 con.connect(async err => { // Begin MySQL Transaction await con.beginTransaction(async err => { // Clear the table await con.query(`TRUNCATE TABLE ${table}`, err => {}) // Loop to insert all inputs into table for (let i = 0; i < values.length; i++){ // Create and execute the query to input values into table await con.query(createInsert(table,keys,values[0]), err => {}) } // When all data are inputed, end Transaction await con.commit(err => { // Write in window that everything gonna allright document.body.innerHTML += "<p>All data where successfully saved into " + table + ".</p>" }) }) // End MySQL Transaction }) 

Answer 1

Like georg had told me, the problem was that I was trying to await async functions, but the await only works with Promises.
I found the answer greetings to him and to this answer that I had received on StackOverflow in portuguese .
So, I just put my connection into a Promise, like this:

 // Save datas into MySQL Database function save(table, keys, values) { return new Promise((res, rej) => { // MSSQL returns a JSON object filled with informations that I don't want // so I filter only what I want: the result of the query values = values.recordset // Start a new MySQL connection let con = mysql.createConnection({ user: OUSER, password: OPASS, server: OHOST, port: OPORT, database: ODB }) con.connect(err => { if (err) { alert(err) window.close() } con.beginTransaction(err => { // This function is just for DontRepeatYourself rollBack(con, err, rej) con.query(`TRUNCATE TABLE ${table}`, err => { rollBack(con, err, rej) }) con.query(createInsert(table,keys,values[0]), err => { rollBack(con, err, rej) }) con.commit(err => { rollBack(con, err, rej) document.body.innerHTML += `<p>All data where successfully registered into ${table}.</p>` res() }) }) }) }) }