Adding async await in node js - node.js

Question

I am using node js function i have written the code long before but i need to add async and await in my functions i don know how to proceed with my code structure .
Here is my code structure
app.express.get('/api/member/logout', function (request, response) {
functionBal.logout(request.query.abc).then(function (result) {
if (result) {
response.set('Content-Type', 'application/json');
response.status(200);
response.json(result);
}
}).catch(function (err) {
response.set('Content-Type', 'application/json');
response.status(400);
response.json("Error -- " + err);
});
});
module.exports.log = function (abc) {
return new app.promise(function (resolve, reject) {
functionDal.log(abc).then(function (result) {
if (result)
resolve(result);
else {
reject("Error");
}
}).catch(function (err) {
reject(err);
});
})
};
module.exports.log = function (abc) {
return new app.promise(function (resolve, reject) {
mySqlConnection.connection().then(function (con) {
con.query("UPDATE member SET table1 = 0 WHERE abc = ?", [abc]).then(function (rows, fields) {
resolve('success');
}).catch(function (err) {
reject(err);
});
}).catch(function (err) {
reject(err);
});
});
}
Please help in adding async await in this coding structure

Answer 1

Give this is try.
app.express.get('/api/member/logout', async function (request, response) {
try {
let data = await functionBal.logout(request.query.abc)
response.set('Content-Type', 'application/json');
response.status(200);
response.json(result);
} catch (error) {
response.set('Content-Type', 'application/json');
response.status(400);
response.json("Error -- " + err);
}
});
module.exports.log = async function (abc) {
try {
return await functionDal.log(abc)
} catch (error) {
throw error
}
};
module.exports.log = async function (abc) {
try {
const con = await mySqlConnection.connection()
await con.query("UPDATE member SET table1 = 0 WHERE abc = ?", [abc])
return 'success'
} catch (error) {
throw error
}
}
Make sure, you have Node.js 8+.