Created
December 1, 2018 15:17
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Resolving promises in a for loop - NodeJS / MySQL
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let mysql = require('mysql'); | |
let connection = mysql.createConnection({ | |
host: "localhost", | |
user: "root", | |
password: "", | |
}); | |
connection.query('USE test_database'); | |
let run_mysql = (mysql_query) => { | |
return new Promise(function (resolve, reject) { | |
connection.query(mysql_query, function (err, rows) { | |
if (err) { | |
return reject(err); | |
} | |
resolve(rows); | |
}); | |
}); | |
} | |
const sF_classbooking = 'SELECT * FROM `users_logs` ORDER BY `ts_create` DESC LIMIT 10'; | |
const sF_userName = 'SELECT `name`,`surname` FROM `users_info` WHERE id='; //2865 | |
run_mysql(sF_classbooking).then(function (rows) { | |
let promises = []; | |
for (var j = 0; j < rows.length; j++) { | |
promises.push(run_mysql(sF_userName + rows[j].id_user)); | |
} | |
Promise.all(promises) | |
.then(function (data) { | |
let logs = []; | |
for (var i = 0; i < data.length; i ++) { | |
var obj = {}; | |
obj.user = data[i][0].name + ', ' + data[i][0].surname; | |
obj.userId = rows[i].id_user; | |
obj.log = rows[i].id_logs; | |
logs.push(obj); | |
} | |
console.log(logs); | |
}) | |
.catch((err) => setImmediate(() => { | |
throw err; | |
})); | |
}).catch((err) => setImmediate(() => { | |
throw err; | |
})); |
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