Loopback4中的事务支持？

Question

如何在Loopback4中支持事务？是否有相同的装饰师，类似于“事务”？

我查看了这里的文档，https://loopback.io/doc/en/lb4/Repositories.html，但是没有提到事务。

Answer 1

LoopBack 4不支持现成的事务。请打开一个新的GitHub问题，讨论如何实现此功能：

• https://github.com/strongloop/loopback-next/issues/new

Answer 2

LoopBack 4现在支持数据库事务很长一段时间：

import {
  Transaction,
  DefaultTransactionalRepository,
  IsolationLevel,
} from '@loopback/repository';

// assuming there is a Note model extending Entity class, and
// ds datasource which is backed by a transaction enabled
// connector
const repo = new DefaultTransactionalRepository(Note, ds);
// Now we have a transaction (tx)
const tx = await repo.beginTransaction(IsolationLevel.READ_COMMITTED);

const created = await repo.create({title: 'Groceries'}, {transaction: tx});
const updated = await repo.update(
  {title: 'Errands', id: created.id},
  {transaction: tx},
);

// commit the transaction to persist the changes
await tx.commit();

进一步读：

• https://loopback.io/doc/en/lb4/Using-database-transactions.html