[英]Node.js - How to use Sequelize transaction
我是sequelize
的初學者,無法進行交易。 文檔不清楚,使以下示例無法適應我的要求。
return sequelize.transaction(t => {
// chain all your queries here. make sure you return them.
return User.create({
firstName: 'Abraham',
lastName: 'Lincoln'
}, {transaction: t}).then(user => {
return user.setShooter({
firstName: 'John',
lastName: 'Boothe'
}, {transaction: t});
});
}).then(result => {
// Transaction has been committed
// result is whatever the result of the promise chain returned to the transaction callback
}).catch(err => {
// Transaction has been rolled back
// err is whatever rejected the promise chain returned to the transaction callback
});
首先,我必須在“Conto”中插入一個元組,然后在“Preferenze”中插入另一個元組,最后根據“tipo”屬性在“ContoPersonale”或“ContoAziendale”中插入一個元組。
如果這些查詢中只有一個失敗,則事務必須進行總回滾,提交。
查詢是:
Conto.create({
id: nextId(),
mail: reg.email,
password: reg.password,
tipo: reg.tipo,
telefono: reg.telefono,
idTelegram: reg.telegram,
saldo: saldoIniziale,
iban: generaIBAN()
})
Preferenze.create({
refConto: 68541
})
if (tipo == 0) {
ContoPersonale.create({
nomeint: reg.nome,
cognomeint: reg.cognome,
dataN: reg.datan,
cf: reg.cf,
refConto: nextId()
})
}
else if (tipo == 1) {
ContoAziendale.create({
pIva: reg.piva,
ragioneSociale: reg.ragsoc,
refConto: nextId()
})
}
對於事務,您將其傳遞給您希望成為事務一部分的每個查詢,然后在完成時調用transaction.commit()
或transaction.rollback()
以回滾所有更改。 這可以使用thenables來完成,但是使用async/await
時會更清楚。
由於您的查詢都不相互依賴,因此您也可以使用Promise.all()
同時進行查詢。
thenables (自動提交)
sequelize.transaction((transaction) => {
// execute all queries, pass in transaction
return Promise.all([
Conto.create({
id: nextId(),
mail: reg.email,
password: reg.password,
tipo: reg.tipo,
telefono: reg.telefono,
idTelegram: reg.telegram,
saldo: saldoIniziale,
iban: generaIBAN()
}, { transaction }),
Preferenze.create({
refConto: 68541
}, { transaction }),
// this query is determined by "tipo"
tipo === 0
? ContoPersonale.create({
nomeint: reg.nome,
cognomeint: reg.cognome,
dataN: reg.datan,
cf: reg.cf,
refConto: nextId()
}, { transaction })
: ContoAziendale.create({
pIva: reg.piva,
ragioneSociale: reg.ragsoc,
refConto: nextId()
}, { transaction })
]);
// if we get here it will auto commit
// if there is an error it with automatically roll back.
})
.then(() => {
console.log('queries ran successfully');
})
.catch((err) => {
console.log('queries failed', err);
});
異步/等待
let transaction;
try {
// start a new transaction
transaction = await sequelize.transaction();
// run queries, pass in transaction
await Promise.all([
Conto.create({
id: nextId(),
mail: reg.email,
password: reg.password,
tipo: reg.tipo,
telefono: reg.telefono,
idTelegram: reg.telegram,
saldo: saldoIniziale,
iban: generaIBAN()
}, { transaction }),
Preferenze.create({
refConto: 68541
}, { transaction }),
// this query is determined by "tipo"
tipo === 0
? ContoPersonale.create({
nomeint: reg.nome,
cognomeint: reg.cognome,
dataN: reg.datan,
cf: reg.cf,
refConto: nextId()
}, { transaction })
: ContoAziendale.create({
pIva: reg.piva,
ragioneSociale: reg.ragsoc,
refConto: nextId()
}, { transaction })
]);
// if we get here they ran successfully, so...
await transaction.commit();
} catch (err) {
// if we got an error and we created the transaction, roll it back
if (transaction) {
await transaction.rollback();
}
console.log('Err', err);
}
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