@loopback/docs/site/apidocs/sequelize.sequelizedatasource.begintransaction.md

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---
lang: en
title: 'API docs: sequelize.sequelizedatasource.begintransaction'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/sequelize
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[Home](./index.md) &gt; [@loopback/sequelize](./sequelize.md) &gt; [SequelizeDataSource](./sequelize.sequelizedatasource.md) &gt; [beginTransaction](./sequelize.sequelizedatasource.begintransaction.md)

## SequelizeDataSource.beginTransaction() method

Begin a new transaction.

**Signature:**

```typescript
beginTransaction(options?: TransactionOptions | TransactionOptions['isolationLevel']): Promise<Transaction>;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

options


</td><td markdown="1">

TransactionOptions \| TransactionOptions\['isolationLevel'\]


</td><td markdown="1">

_(Optional)_ Options {<!-- -->isolationLevel: '...'<!-- -->}


</td></tr>
</tbody></table>

**Returns:**

Promise&lt;Transaction&gt;

A promise which resolves to a Sequelize Transaction object