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azure-database

(★ 103)

Azure CosmosDB Database module for Nest framework (node.js) ☁️

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- config.yml
- ISSUE_TEMPLATE.md
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- - cosmos-db-core.module.ts
  - cosmos-db.constants.ts
  - cosmos-db.decorators.spec.ts
  - cosmos-db.decorators.ts
  - cosmos-db.interface.ts
  - cosmos-db.module.ts
  - cosmos-db.providers.ts
  - cosmos-db.utils.spec.ts
  - cosmos-db.utils.ts
  - index.ts
- - azure-table.constant.ts
  - azure-table.decorators.spec.ts
  - azure-table.decorators.ts
  - azure-table.interface.ts
  - azure-table.mapper.spec.ts
  - azure-table.mapper.ts
  - azure-table.module.ts
  - azure-table.providers.ts
  - azure-table.repository.ts
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# Installation Guide

1. Get the code

git clone https://github.com/nestjs/azure-database

Downloads the entire project code from GitHub to your computer.

cd azure-database

Moves into the project folder you just downloaded.

2. Node.js

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Node.js Node.js must be installed to use npm. The LTS version is recommended.

$ npm i --save @nestjs/azure-database

Type this command into your terminal and run it.

✅ After running the command, open the address shown in the terminal (usually something like http://localhost:3000) in your browser.

Pulled directly from this repo's README.

// repository documentation

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## Description

Azure Database ([Table Storage](http://bit.ly/nest_azure-storage-table), [Cosmos DB - NoSQL](https://azure.microsoft.com/en-us/services/cosmos-db/)) module for [Nest](https://github.com/nestjs/nest) framework (node.js)

## Disclaimer

You are reading the documentation for version 3. If you are looking for version 2 documentation, [click here](https://github.com/nestjs/azure-database/tree/legacy-v2). Please also note that version 2 is no longer maintained and will not receive any updates!

## Before Installation

For Cosmos DB (NoSQL ONLY)

1. Create a Cosmos DB account and resource ([read more](https://learn.microsoft.com/azure/cosmos-db/nosql/quickstart-portal))
2. Note down the "URI", Database name and the "Primary Key" (or "Secondary Key") - You will need them later

For Table Storage

1. Create a Storage account and resource ([read more](https://learn.microsoft.com/azure/storage/tables/table-storage-quickstart-portal))
2. Note down the "Connection string" - You will need it later

## Installation

```bash
$ npm i --save @nestjs/azure-database
```

## Usage

### For Azure Cosmos DB support

1. Create or update your existing `.env` file with the following content:

```
AZURE_COSMOS_DB_NAME=
AZURE_COSMOS_DB_ENDPOINT=
AZURE_COSMOS_DB_KEY=
```

2. **IMPORTANT: Make sure to add your `.env` file to your .gitignore! The `.env` file MUST NOT be versioned on Git.**

3. Make sure to include the following call to your `main.ts` file:

```typescript
if (process.env.NODE_ENV !== 'production') require('dotenv').config();
```

> This line must be added before any other imports!

### Example

> Note: Check out the CosmosDB example project included in the [sample folder](https://github.com/nestjs/azure-database/tree/master/sample/cosmos-db)

#### Prepare your entity

0. Create a new feature module, eg. with the nest CLI:

```shell
$ nest generate module event
```

1. Create a Data Transfer Object (DTO) inside a file named `event.dto.ts`:

```typescript
export class EventDTO {
  id?: string;
  name: string;
  type: string;
  createdAt: Date;
}
```

2. Create a file called `event.entity.ts` and describe the entity model using the provided decorators:

- `@CosmosPartitionKey(value: string | HierarchicalPartitionKey)`: Represents the `PartitionKey` or [`HierarchicalPartitionKey`](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/cosmosdb/cosmos#crud-on-container-with-hierarchical-partition-key) of the entity (**required**).

- `@CosmosDateTime(value?: string)`: For DateTime values.

**Important:** Using a Hierarchical Partition Key requires a container that uses hierarchical partition keys, [read more](https://learn.microsoft.com/azure/cosmos-db/hierarchical-partition-keys).

For instance, the shape of the following entity:

```typescript
import { CosmosDateTime, CosmosPartitionKey } from '@nestjs/azure-database';
import { PartitionKeyDefinitionVersion, PartitionKeyKind } from '@azure/cosmos';

@CosmosPartitionKey({
  paths: ['/name', '/type/label'],
  version: PartitionKeyDefinitionVersion.V2,
  kind: PartitionKeyKind.MultiHash,
})
export class Event {
  id?: string;
  name: string;
  type: {
    label: string;
  };
  @CosmosDateTime() createdAt: Date;
}
```

Will be automatically converted to:

```json
{
  "name": "NestJS Meetup",
  "type": {
    "label": "Meetup"
  },
  "createdAt": "2019-11-15T17:05:25.427Z"
}
```

1. Import the `AzureCosmosDbModule` inside your Nest feature module `event.module.ts`:

```typescript
import { AzureCosmosDbModule } from '@nestjs/azure-database';
import { Module } from '@nestjs/common';
import { Event } from './event.entity';

@Module({
  imports: [
    AzureCosmosDbModule.forRoot({
      dbName: process.env.AZURE_COSMOS_DB_NAME,
      endpoint: process.env.AZURE_COSMOS_DB_ENDPOINT,
      key: process.env.AZURE_COSMOS_DB_KEY,
      retryAttempts: 1,
    }),
    AzureCosmosDbModule.forFeature([{ dto: Event }]),
  ],
})
export class EventModule {}
```

#### CRUD operations

0. Create a service that will abstract the CRUD operations:

```shell
$ nest generate service event
```

1. Use the `@InjectModel(Event)` to get an instance of the Azure Cosmos DB [Container](https://docs.microsoft.com/en-us/javascript/api/@azure/cosmos/container) for the entity definition created earlier:

```typescript
import { InjectModel } from '@nestjs/azure-database';
import type { Container } from '@azure/cosmos';
import { Injectable } from '@nestjs/common';
import { Event } from './event.entity';

@Injectable()
export class EventService {
  constructor(
    @InjectModel(Event)
    private readonly eventContainer: Container,
  ) {}
}
```

`@InjectModel(Event)` will inject an Azure Cosmos DB `Container` instance for the `Event` entity. The `Container` provides a list of public methods for managing the database.

**IMPORTANT: Please note that the `Container` instance is not a NestJS repository. It is the actual instance provided by the official [Azure Cosmos DB SDK](https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/cosmosdb/cosmos/README.md).**

##### CREATE

```typescript
async create(eventDto: EventDTO): Promise<Event> {
  const { resource } = await this.eventContainer.items.create<Event>(
    eventDto,
  );
  return resource;
}
```

##### READ

Fetches all the results of the query.

```typescript
async getEvents(): Promise<Event[]> {
  const querySpec = {
    query: 'SELECT * FROM events',
  };

const { resources } = await this.eventContainer.items
    .query<Event>(querySpec)
    .fetchAll();
  return resources;
}
```

Fetch a single resource.

```typescript
async getEvent(id: string, partitionKey: string | string[]): Promise<Event> {
  const { resource } = await this.eventContainer
        .item(id, type)
        .read<Event>();
  return resource;
}
```

##### UPDATE

Replaces an item in the database.

```typescript
async updateEvent(
  id: string,
  partitionKey: string | string[],
  eventData: EventDTO,
): Promise<Event> {
  let { resource: item } = await this.eventContainer
    .item(id, type)
    .read<Event>();

item = {
    ...item,
    ...eventData,
  };

const { resource: replaced } = await this.eventContainer
    .item(id, type)
    .replace(item);

return replaced;
}
```

##### DELETE

Deletes an item from the database.

```typescript
async deleteEvent(id: string, partitionKey: string | string[]): Promise<Event> {
  const { resource: deleted } = await this.eventContainer
    .item(id, type)
    .delete<Event>();

return deleted;
}
```

#### Hierarchical Partition Keys

If using hierarchical partition keys, you need to provide the partition key as an array of strings when calling one of the CRUD methods on the `Container`. For example, when reading a single resource:

```javascript
this.eventContainer
        .item("1234", ['foo', 'bar'])
        .read<Event>();
```

Read more about [Hierarchical Partition Keys](https://learn.microsoft.com/en-us/azure/cosmos-db/hierarchical-partition-keys?tabs=javascript-v4%2Carm-json).

### For Azure Table Storage support

1. Create or update your existing `.env` file with the following content:

```
AZURE_STORAGE_CONNECTION_STRING=
```

2. **IMPORTANT: Make sure to add your `.env` file to your .gitignore! The `.env` file MUST NOT be versioned on Git.**

3. Make sure to include the following call to your `main.ts` file:

```typescript
if (process.env.NODE_ENV !== 'production') require('dotenv').config();
```

> This line must be added before any other imports!

4. The `AzureTableStorageModule` will automatically read the `AZURE_STORAGE_CONNECTION_STRING` environment variable and use it to connect to your Azure Storage account.

### Example

Check out the Table Storage example project included in the [sample folder](https://github.com/nestjs/azure-database/tree/master/sample/table-storage)

#### Prepare your entity

0. Create a new feature module, eg. with the nest CLI:

```shell
$ nest generate module event
```

1. Create a Data Transfer Object (DTO) inside a file named `event.dto.ts`:

```typescript
export class EventDTO {
  name: string;
  type: string;
}
```

2. Create a file called `event.entity.ts` and describe the entity model using plain JavaScript objects. **The only requirement is to provide a `partitionKey` and a `rowKey` properties.** For instance, the shape of the following entity:

```typescript
export class Event {
  partitionKey: string; // required
  rowKey: string; // required
  name: string;
  type: string;
}
```

1. Import the `AzureTableStorageModule` inside your Nest feature module `event.module.ts`:

```typescript
import { Module } from '@nestjs/common';
import { AzureTableStorageModule } from '@nestjs/azure-database';

@Module({
  imports: [AzureTableStorageModule.forFeature(Event)],
})
export class EventModule {}
```

You can optionally pass in the following arguments:

```typescript
import { Module } from '@nestjs/common';
import { AzureTableStorageModule } from '@nestjs/azure-database';

@Module({
  imports: [
    AzureTableStorageModule.forFeature(Event, {
      table: 'foobar',
      createTableIfNotExists: true,
    }),
  ],
})
export class EventModule {}
```

- `table: string`: The name of the table. If not provided, the name of the `Event` entity will be used as a table name
- `createTableIfNotExists: boolean`: Whether to automatically create the table if it doesn't exists or not:
  - If `true` the table will be created during the startup of the app.
  - If `false` the table will not be created. **You will have to create the table by yourself before querying it!**

#### CRUD operations

0. Create a service that will abstract the CRUD operations:

```shell
$ nest generate service event
```

1. Use the `@InjectRepository(Event)` to get an instance of the Azure `Repository` for the entity definition created earlier:

```typescript
import { InjectRepository, Repository } from '@nestjs/azure-database';
import { Injectable } from '@nestjs/common';
import { Event } from './event.entity';

@Injectable()
export class EventService {
  constructor(
    @InjectRepository(Event)
    private readonly eventRepository: Repository<Event>,
  ) {}
}
```

The `AzureTableStorageRepository` provides a list of public methods for managing various CRUD operations:

##### CREATE

`create(entity: T): Promise<T | null>`: creates a new entity.

```typescript
  async create(event: Event): Promise<Event> {
    return await this.eventRepository.create(event);
  }
```

##### READ

`find(partitionKey: string, rowKey: string): Promise<T>`: finds one entity using its `partitionKey` and `rowKey`.

```typescript
  async find(partitionKey: string, rowKey: string): Promise<Event> {
    return await this.eventRepository.find(partitionKey, rowKey);
  }
```

`findAll(options: { queryOptions?: TableEntityQueryOptions }): Promise<T[]>`: finds all entities.

```typescript
  async findAll(options: { queryOptions?: TableEntityQueryOptions }): Promise<Event[]> {
    return await this.eventRepository.findAll();
  }
```

##### UPDATE

`update(partitionKey: string, rowKey: string, entity: T): Promise<T>`: Updates an entity using a "merge" strategy.

```typescript
  async update(
    partitionKey: string,
    rowKey: string,
    event: Event,
  ): Promise<Event> {
    return await this.eventRepository.update(partitionKey, rowKey, event);
  }
```

##### DELETE

`delete(partitionKey: string, rowKey: string): Promise<DeleteTableEntityResponse>`: Removes an entity from the table.

```typescript
  async delete(partitionKey: string, rowKey: string): Promise<void> {
    await this.eventRepository.delete(partitionKey, rowKey);
  }
```

## Support

Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).

## Stay in touch

- Author - [Wassim Chegham](https://wassim.dev)
- Website - [https://wassim.dev](https://wassim.dev/)
- Twitter - [@manekinekko](https://twitter.com/manekinekko)

## License

Nest is [MIT licensed](LICENSE).

[edm-types]: http://bit.ly/nest-edm