Nodejs for loop with MySQL insert not functioning as expected - mysql

Question

When I trying to Insert some data and process the result using "for Loop", iteration only complete in last cycle.
const sql4 = "insert into core_crm_job_task set ?";
for(var m = 0; req.body.jobTasks.length > m; m++){
console.log('a'+m);
let jobTask = {
ID_JOB_REGISTRY : registryId,
ID_TASK_CODE : jobCode+' '+req.body.jobTasks[m].task_code_suffix,
TASK_TYPE : req.body.jobTasks[m].task_type,
TASK_QTY : req.body.jobTasks[m].task_qty,
TASK_INSTRUMENT : req.body.jobTasks[m].task_instrument,
TASK_INSTRUMENT_ID : req.body.jobTasks[m].task_instrument_id,
REMARK : req.body.jobTasks[m].task_remark,
IS_ACTIVE: 1,
CREATED_BY: 1,
CREATED_DATE: getCurrentTime()
};
connection.query(sql4,jobTask, (err, result) => {
if (err){
console.log('b'+m);
connection.release();
}
else{
console.log('c'+m);
//some process here
}
})
}
Below shows sample output when I used an array with 3 elements.
The log with letter 'c' only print in last element. Other elements didn't complete the iteration.
a0
a1
a2
c2
But I need to do some process after each insert query. In this case it is impossible.
Please suggest some solution!

Answer 1

You can you can use async.eachAsync Ref
So it will execute one by one, you will get expected result
const sql4 = "insert into core_crm_job_task set ?";
async.each(req.body.jobTasks,function(obj,callback){
let jobTask = {
ID_JOB_REGISTRY : registryId,
ID_TASK_CODE : jobCode+' '+obj.task_code_suffix,
TASK_TYPE : obj.task_type,
};
connection.query(sql4,jobTask, (err, result) => {
if (err){
callback(err);
}
callback(null);
})
});

Answer 2

Problem solved! :)
Just Replaced for loop variable type to "let"
for(var m = 0; req.body.jobTasks.length > m; m++)
to
for(let m = 0; req.body.jobTasks.length > m; m++)

Answer 3

addEmojies: function (request, callback) {
//getting the inputs
var questions = request.body.question;
//if questions contains only one
if (!Array.isArray(questions)) {
questions = que = [request.body.question];
}
const mysqlConnection = mysqlPool(function (err, connection) {
connection.beginTransaction(function (err) {
if (err) {
connection.release();
if (err) { throw err; }
}
//loop trough the questions
for (var q = 0; q < questions.length; q++) {
//setting up data object for update category
var mainQuestionValues = {
CAMPAIGN_ID: questions[q].campaign_id,
MAIN_QUESTION_TITLE: questions[q].question,
CREATED_BY: session.userdata.user_id,
HAS_SUB_QUESTIONS:0,
IS_ACTIVE: 1
};
const sql = 'INSERT INTO main_question SET ?';
connection.query(sql, mainQuestionValues, function (err, result) {
if (err) {
if (err) { throw err; }
connection.release();
connection.rollback(function () {
return callback(false);
});
}
connection.commit(function (err) {
if (err) {
connection.release();
logger.error(err);
connection.rollback(function () {
return callback(false);
});
}
connection.release();
return callback(true);
});
});
}
});
});
},