NodeJs async sql to variable - node.js

Question

I want a result like this
var rolecheck = ['289773584216358912','281531832938266625'];
Only fetched from a database, so I can compare it to another array with Id's (and yes it's supposed to be a string)
The purpoose of this is to check, before executing a command, if the user has a specific role with permission for that role. So it needs to be a function able to be called.
I've never worked with NodeJs async functions, so i have no clue how to convert this sql to an array:
The content of the .then is just some code of me trying to find out how it works, so ignore the consolelogs etc. Note: the logs do return the correct roles, but i just need them to return them to use them in my compare function.
sql.all("SELECT roleId FROM roles WHERE punish = 'true' and guildId = '"+guildids+"'").then(row => {
if (row) {
var rolecheck = [];
row.forEach(function(row){
rolecheck.push(row.roleId);
});
console.log(rolecheck);
}
});
returning does not work, so I need a workaround.
Here's where i compare it: (this works fine as long as rolecheck and role.id are defined correctly, which they aren't. It does work when i hardcode the rolecheck array.
member.forEach(function(role){
if(HasRole(rolecheck, role.id)){
console.log('user has role: '+role.name);
return true;
}
});

Answer 1

In case you can use a node version with async/await support, like version 7, here is a way to write promise-based code in a synchronous manner. This makes it simpler to pass around the row value.
async function myFunction () {
try {
let member = ''; // whatever member should be
let row = await sql.all("SELECT roleId FROM roles WHERE punish = 'true' and guildId = '"+guildids+"'");
// now you have the row available, outside of 'then' blocks
var rolecheck = [];
if (row) {
row.forEach(function(row){
rolecheck.push(row.roleId);
});
console.log(rolecheck);
}
member.forEach(function(role){
if (HasRole(rolecheck, role.id)) {
console.log('user has role: '+role.name);
return true;
}
});
} catch (error) {
consol.log(error.stack);
}
}
If sql.all did not return a promise you could instead do something like this which would also work with callback based functions
async function myFunction () {
try {
let row = await runSql();
// everything else same as first example above
}
async function runSql () {
try {
return new Promise(function (resolve, reject) {
sql.all("SELECT roleId FROM roles WHERE punish = 'true' and guildId = '"+guildids+"'")
.then(row => {
if (row) {
var rolecheck = [];
row.forEach(function(row){
rolecheck.push(row.roleId);
});
console.log(rolecheck);
resolve(row);
} else {
reject('Row not found');
}
});
});
} catch (error) {
console.log('erro')
}
};