Dataset

Dataset

Interact with your BigQuery dataset. Create a Dataset instance with BigQuery#createDataset or BigQuery#dataset.

Constructor

new Dataset(bigQuery, id, optionsopt)

Parameters:
Name Type Attributes Description
bigQuery BigQuery

BigQuery instance.
id string

The ID of the Dataset.
options object <optional>

Dataset options.

Properties
Name Type Attributes Description
location string <optional>

The geographic location of the dataset. Defaults to US.
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');
```

Methods

create(callbackopt) → {Promise.<CreateDatasetResponse>}

Create a dataset.

Parameters:
Name Type Attributes Description
callback CreateDatasetCallback <optional>

The callback function.

Properties
Name Type Attributes Description
err error <nullable>

An error returned while making this request.
dataset Dataset

The newly created dataset.
apiResponse object

The full API response.
Returns:
Type Description
Promise.<CreateDatasetResponse>
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');
dataset.create((err, dataset, apiResponse) => {
  if (!err) {
    // The dataset was created successfully.
  }
});

//-
// If the callback is omitted, we'll return a Promise.
//-
dataset.create().then((data) => {
  const dataset = data[0];
  const apiResponse = data[1];
});
```

createQueryStream(options) → {stream}

Run a query scoped to your dataset as a readable object stream.

See BigQuery#createQueryStream for full documentation of this method.

Parameters:
Name Type Description
options object

See BigQuery#createQueryStream for full documentation of this method.
Returns:
Type Description
stream

exists(callbackopt) → {Promise.<DatasetExistsResponse>}

Check if the dataset exists.

Parameters:
Name Type Attributes Description
callback DatasetExistsCallback <optional>

The callback function.

Properties
Name Type Attributes Description
err error <nullable>

An error returned while making this request.
exists boolean

Whether the dataset exists or not.
Returns:
Type Description
Promise.<DatasetExistsResponse>
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');
dataset.exists((err, exists) => {});

//-
// If the callback is omitted, we'll return a Promise.
//-
dataset.exists().then((data) => {
  const exists = data[0];
});
```

get(optionsopt, callbackopt) → {Promise.<GetDatasetResponse>}

Get a dataset if it exists.

You may optionally use this to "get or create" an object by providing an object with autoCreate set to true. Any extra configuration that is normally required for the create method must be contained within this object as well.

Parameters:
Name Type Attributes Description
options options <optional>

Configuration object.

Properties
Name Type Attributes Default Description
autoCreate boolean <optional>
 false

Automatically create the object if it does not exist.
callback GetDatasetCallback <optional>

The callback function.

Properties
Name Type Attributes Description
err error <nullable>

An error returned while making this request.
dataset Dataset

The dataset.
apiResponse object

The full API response.
Returns:
Type Description
Promise.<GetDatasetResponse>
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');
dataset.get((err, dataset, apiResponse) => {
  if (!err) {
    // `dataset.metadata` has been populated.
  }
});

//-
// If the callback is omitted, we'll return a Promise.
//-
dataset.get().then((data) => {
  const dataset = data[0];
  const apiResponse = data[1];
});
```

getMetadata(callbackopt) → {Promise.<GetDatasetMetadataResponse>}

Get the metadata for the Dataset.

See Datasets: get API Documentation

Parameters:
Name Type Attributes Description
callback GetDatasetMetadataCallback <optional>

The callback function.

Properties
Name Type Attributes Description
err error <nullable>

An error returned while making this request.
metadata object

The dataset's metadata.
apiResponse object

The full API response.
Returns:
Type Description
Promise.<GetDatasetMetadataResponse>
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');
dataset.getMetadata((err, metadata, apiResponse) => {});

//-
// If the callback is omitted, we'll return a Promise.
//-
dataset.getMetadata().then((data) => {
  const metadata = data[0];
  const apiResponse = data[1];
});
```

getModelsStream(optionsopt) → {stream}

List all or some of the Model objects in your project as a readable object stream.

Parameters:
Name Type Attributes Description
options object <optional>

Configuration object. See Dataset#getModels for a complete list of options.
Returns:
Type Description
stream
Examples
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

dataset.getModelsStream()
  .on('error', console.error)
  .on('data', (model) => {})
  .on('end', () => {
    // All models have been retrieved
  });

```
If you anticipate many results, you can end a stream early to prevent unnecessary processing and API requests.
```
dataset.getModelsStream()
  .on('data', function(model) {
    this.end();
  });
```

getRoutinesStream(optionsopt) → {stream}

List all or some of the Routine objects in your project as a readable object stream.

Parameters:
Name Type Attributes Description
options GetRoutinesOptions <optional>

Configuration object.
Returns:
Type Description
stream
Examples
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

dataset.getRoutinesStream()
  .on('error', console.error)
  .on('data', (routine) => {})
  .on('end', () => {
    // All routines have been retrieved
  });

```
If you anticipate many results, you can end a stream early to prevent unnecessary processing and API requests.
```
dataset.getRoutinesStream()
  .on('data', function(routine) {
    this.end();
  });
```

getTablesStream(optionsopt) → {stream}

List all or some of the Table objects in your project as a readable object stream.

Parameters:
Name Type Attributes Description
options object <optional>

Configuration object. See Dataset#getTables for a complete list of options.
Returns:
Type Description
stream
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

dataset.getTablesStream()
  .on('error', console.error)
  .on('data', (table) => {})
  .on('end', () => {
    // All tables have been retrieved
  });

//-
// If you anticipate many results, you can end a stream early to prevent
// unnecessary processing and API requests.
//-
dataset.getTablesStream()
  .on('data', function(table) {
    this.end();
  });
```

model(id) → {Model}

Create a Model object.

Parameters:
Name Type Description
id string

The ID of the model.
Returns:
Type Description
Model
Throws:

if model ID is missing.

Type
TypeError
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

const model = dataset.model('my-model');
```

routine(id) → {Routine}

Create a Routine object.

Parameters:
Name Type Description
id string

The ID of the routine.
Returns:
Type Description
Routine
Throws:

if routine ID is missing.

Type
TypeError
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

const routine = dataset.routine('my_routine');
```

setMetadata(metadata, callbackopt) → {Promise.<SetDatasetMetadataResponse>}

Sets the metadata of the Dataset object.

See Datasets: patch API Documentation

Parameters:
Name Type Attributes Description
metadata object

Metadata to save on the Dataset.
callback SetDatasetMetadataCallback <optional>

The callback function.

Properties
Name Type Attributes Description
err error <nullable>

An error returned while making this request.
apiResponse object

The full API response.
Returns:
Type Description
Promise.<SetDatasetMetadataResponse>
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

const metadata = {
  description: 'Info for every institution in the 2013 IPEDS universe'
};

dataset.setMetadata(metadata, (err, apiResponse) => {});

//-
// If the callback is omitted, we'll return a Promise.
//-
dataset.setMetadata(metadata).then((data) => {
  const apiResponse = data[0];
});
```

table(id, optionsopt) → {Table}

Create a Table object.

Parameters:
Name Type Attributes Description
id string

The ID of the table.
options object <optional>

Table options.

Properties
Name Type Attributes Description
location string <optional>

The geographic location of the table, by default this value is inherited from the dataset. This can be used to configure the location of all jobs created through a table instance. It cannot be used to set the actual location of the table. This value will be superseded by any API responses containing location data for the table.
Returns:
Type Description
Table
Throws:

if table ID is missing.

Type
TypeError
Example
```
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const dataset = bigquery.dataset('institutions');

const institutions = dataset.table('institution_data');
```