Mixing
Sequelize Postgres - Handling concurrent request
0
When concurrent request is made for below code, two transaction executed concurrently.
- First update (soft delete columns)
- Then inserts rows
For two transactions due to concurrent request, first two updates executes and then rows get inserted from both the transactions. How to resolve this.
execute(aid, id, d) {
const _self = this;
this.db.transaction({autocommit: false, isolationLevel: this.db.Transaction.ISOLATION_LEVELS.SERIALIZABLE},
function (t)
{
_self.modal.destroy({
where: {
aid : aid
}
})
.then((result) => {
let promises = ;
for(let i=0; i<data.length; i++) {
promises.push(new Promise(function(resolve, reject) {
_self.modal.create({
val: d[i].val,
id: id,
}).then((s) => {
let hold =
for(let j=0; j<data[i].hold.length; j++) {
hold.push(_self.addDist(id, aid, s.id, d[i].hold[j]))
}
Promise.all(hold).then(() => {
resolve();
})
}).error(error => {
// error
});
}));
}
return Promise.all(promises);
}).then(() => {
_self.modal.findOne({
where: {
id: id,
},
include: [{}]
}).then(e => {
//success
}).catch(error => {
console.log(error);
});
})
}).catch(function (error)
{
console.log('rolling back as got error ', error);
});
postgresql sequelize.js
asked Nov 20 '18 at 13:36
RehanRehan
1216
add a comment |
0
When concurrent request is made for below code, two transaction executed concurrently.
- First update (soft delete columns)
- Then inserts rows
For two transactions due to concurrent request, first two updates executes and then rows get inserted from both the transactions. How to resolve this.
execute(aid, id, d) {
const _self = this;
this.db.transaction({autocommit: false, isolationLevel: this.db.Transaction.ISOLATION_LEVELS.SERIALIZABLE},
function (t)
{
_self.modal.destroy({
where: {
aid : aid
}
})
.then((result) => {
let promises = ;
for(let i=0; i<data.length; i++) {
promises.push(new Promise(function(resolve, reject) {
_self.modal.create({
val: d[i].val,
id: id,
}).then((s) => {
let hold =
for(let j=0; j<data[i].hold.length; j++) {
hold.push(_self.addDist(id, aid, s.id, d[i].hold[j]))
}
Promise.all(hold).then(() => {
resolve();
})
}).error(error => {
// error
});
}));
}
return Promise.all(promises);
}).then(() => {
_self.modal.findOne({
where: {
id: id,
},
include: [{}]
}).then(e => {
//success
}).catch(error => {
console.log(error);
});
})
}).catch(function (error)
{
console.log('rolling back as got error ', error);
});
postgresql sequelize.js
asked Nov 20 '18 at 13:36
RehanRehan
1216
add a comment |
0
0
0
When concurrent request is made for below code, two transaction executed concurrently.
- First update (soft delete columns)
- Then inserts rows
For two transactions due to concurrent request, first two updates executes and then rows get inserted from both the transactions. How to resolve this.
execute(aid, id, d) {
const _self = this;
this.db.transaction({autocommit: false, isolationLevel: this.db.Transaction.ISOLATION_LEVELS.SERIALIZABLE},
function (t)
{
_self.modal.destroy({
where: {
aid : aid
}
})
.then((result) => {
let promises = ;
for(let i=0; i<data.length; i++) {
promises.push(new Promise(function(resolve, reject) {
_self.modal.create({
val: d[i].val,
id: id,
}).then((s) => {
let hold =
for(let j=0; j<data[i].hold.length; j++) {
hold.push(_self.addDist(id, aid, s.id, d[i].hold[j]))
}
Promise.all(hold).then(() => {
resolve();
})
}).error(error => {
// error
});
}));
}
return Promise.all(promises);
}).then(() => {
_self.modal.findOne({
where: {
id: id,
},
include: [{}]
}).then(e => {
//success
}).catch(error => {
console.log(error);
});
})
}).catch(function (error)
{
console.log('rolling back as got error ', error);
});
postgresql sequelize.js
asked Nov 20 '18 at 13:36
RehanRehan
1216
When concurrent request is made for below code, two transaction executed concurrently.
- First update (soft delete columns)
- Then inserts rows
For two transactions due to concurrent request, first two updates executes and then rows get inserted from both the transactions. How to resolve this.
execute(aid, id, d) {
const _self = this;
this.db.transaction({autocommit: false, isolationLevel: this.db.Transaction.ISOLATION_LEVELS.SERIALIZABLE},
function (t)
{
_self.modal.destroy({
where: {
aid : aid
}
})
.then((result) => {
let promises = ;
for(let i=0; i<data.length; i++) {
promises.push(new Promise(function(resolve, reject) {
_self.modal.create({
val: d[i].val,
id: id,
}).then((s) => {
let hold =
for(let j=0; j<data[i].hold.length; j++) {
hold.push(_self.addDist(id, aid, s.id, d[i].hold[j]))
}
Promise.all(hold).then(() => {
resolve();
})
}).error(error => {
// error
});
}));
}
return Promise.all(promises);
}).then(() => {
_self.modal.findOne({
where: {
id: id,
},
include: [{}]
}).then(e => {
//success
}).catch(error => {
console.log(error);
});
})
}).catch(function (error)
{
console.log('rolling back as got error ', error);
});
postgresql sequelize.js
postgresql sequelize.js
asked Nov 20 '18 at 13:36
RehanRehan
1216
asked Nov 20 '18 at 13:36
RehanRehan
1216
edited Nov 20 '18 at 13:54
Rehan
asked Nov 20 '18 at 13:36
RehanRehan
1216
asked Nov 20 '18 at 13:36
RehanRehan
1216
asked Nov 20 '18 at 13:36
RehanRehan
1216
1216
add a comment |
add a comment |
1 Answer
1
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oldest
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0
we need to define transaction type as mentioned below and it works well.
type: this.db.Transaction.TYPES.EXCLUSIVE
answered Nov 28 '18 at 12:58
RehanRehan
1216
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
we need to define transaction type as mentioned below and it works well.
type: this.db.Transaction.TYPES.EXCLUSIVE
answered Nov 28 '18 at 12:58
RehanRehan
1216
add a comment |
0
we need to define transaction type as mentioned below and it works well.
type: this.db.Transaction.TYPES.EXCLUSIVE
answered Nov 28 '18 at 12:58
RehanRehan
1216
add a comment |
0
0
0
we need to define transaction type as mentioned below and it works well.
type: this.db.Transaction.TYPES.EXCLUSIVE
answered Nov 28 '18 at 12:58
RehanRehan
1216
we need to define transaction type as mentioned below and it works well.
type: this.db.Transaction.TYPES.EXCLUSIVE
answered Nov 28 '18 at 12:58
RehanRehan
1216
answered Nov 28 '18 at 12:58
RehanRehan
1216
answered Nov 28 '18 at 12:58
RehanRehan
1216
answered Nov 28 '18 at 12:58
RehanRehan
1216
1216
add a comment |
add a comment |
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