com.google.cloud.bigquery

Class Dataset

java.lang.Object

com.google.cloud.bigquery.DatasetInfo

com.google.cloud.bigquery.Dataset

All Implemented Interfaces:

Serializable

public class Dataset
extends DatasetInfo

A Google BigQuery Dataset.

Objects of this class are immutable. Operations that modify the dataset like update(com.google.cloud.bigquery.BigQuery.DatasetOption...) return a new object. To get a Dataset object with the most recent information use reload(com.google.cloud.bigquery.BigQuery.DatasetOption...). Dataset adds a layer of service-related functionality over DatasetInfo.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Dataset.Builder A builder for Dataset objects.

Method Summary

Modifier and Type	Method and Description
Table	create(String tableId, TableDefinition definition, BigQuery.TableOption... options) Creates a new table in this dataset.
boolean	delete(BigQuery.DatasetDeleteOption... options) Deletes this dataset.
boolean	equals(Object obj)
boolean	exists() Checks if this dataset exists.
Table	get(String tableId, BigQuery.TableOption... options) Returns the requested table in this dataset or null if not found.
BigQuery	getBigQuery() Returns the dataset's BigQuery object used to issue requests.
int	hashCode()
Page<Table>	list(BigQuery.TableListOption... options) Returns the paginated list of tables in this dataset.
Dataset	reload(BigQuery.DatasetOption... options) Fetches current dataset's latest information.
Dataset.Builder	toBuilder() Returns a builder for the dataset object.
Dataset	update(BigQuery.DatasetOption... options) Updates the dataset's information with this dataset's information.

Methods inherited from class com.google.cloud.bigquery.DatasetInfo

getAcl, getCreationTime, getDatasetId, getDefaultTableLifetime, getDescription, getEtag, getFriendlyName, getGeneratedId, getLabels, getLastModified, getLocation, getSelfLink, newBuilder, newBuilder, newBuilder, of, of, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

exists

public boolean exists()

Checks if this dataset exists.

Example of checking whether a dataset exists.

 boolean exists = dataset.exists();
 if (exists) {
   // the dataset exists
 } else {
   // the dataset was not found
 }
 

Returns:

true if this dataset exists, false otherwise

Throws:

BigQueryException - upon failure

reload

public Dataset reload(BigQuery.DatasetOption... options)

Fetches current dataset's latest information. Returns null if the dataset does not exist.

Example of reloading a dataset.

 Dataset latestDataset = dataset.reload();
 if (latestDataset == null) {
   // The dataset was not found
 }
 

Parameters:

options - dataset options

Returns:

a Dataset object with latest information or null if not found

Throws:

BigQueryException - upon failure

update

public Dataset update(BigQuery.DatasetOption... options)

Updates the dataset's information with this dataset's information. Dataset's user-defined id cannot be changed. A new Dataset object is returned.

Example of updating a dataset.

 String friendlyName = "my_friendly_name";
 Builder builder = dataset.toBuilder();
 builder.setFriendlyName(friendlyName);
 Dataset updatedDataset = builder.build().update();
 

Parameters:

options - dataset options

Returns:

a Dataset object with updated information

Throws:

BigQueryException - upon failure

delete

public boolean delete(BigQuery.DatasetDeleteOption... options)

Deletes this dataset.

Example of deleting a dataset.

 boolean deleted = dataset.delete();
 if (deleted) {
   // The dataset was deleted
 } else {
   // The dataset was not found
 }
 

Returns:

true if dataset was deleted, false if it was not found

Throws:

BigQueryException - upon failure

list

public Page<Table> list(BigQuery.TableListOption... options)

Returns the paginated list of tables in this dataset.

Example of listing tables in the dataset.

 Page<Table> tables = dataset.list();
 for (Table table : tables.iterateAll()) {
   // do something with the table
 }
 

Parameters:

options - options for listing tables

Throws:

BigQueryException - upon failure

get

public Table get(String tableId,
                 BigQuery.TableOption... options)

Returns the requested table in this dataset or null if not found.

Example of getting a table in the dataset.

 String tableName = “my_table”;
 Table table = dataset.get(tableName);
 

Parameters:

tableId - user-defined id of the requested table

options - table options

Throws:

BigQueryException - upon failure

create

public Table create(String tableId,
                    TableDefinition definition,
                    BigQuery.TableOption... options)

Creates a new table in this dataset.

Example of creating a table in the dataset with schema and time partitioning.

 String tableName = “my_table”;
 String fieldName = “my_field”;
 Schema schema = Schema.of(Field.of(fieldName, LegacySQLTypeName.STRING));
 StandardTableDefinition definition = StandardTableDefinition.newBuilder()
     .setSchema(schema)
     .setTimePartitioning(TimePartitioning.of(TimePartitioning.Type.DAY))
     .build();
 Table table = dataset.create(tableName, definition);
 

Parameters:

tableId - the table's user-defined id

definition - the table's definition

options - options for table creation

Returns:

a Table object for the created table

Throws:

BigQueryException - upon failure

getBigQuery

public BigQuery getBigQuery()

Returns the dataset's BigQuery object used to issue requests.

toBuilder

public Dataset.Builder toBuilder()

Description copied from class: DatasetInfo

Returns a builder for the dataset object.

Overrides:

toBuilder in class DatasetInfo

equals

public final boolean equals(Object obj)

Overrides:

equals in class DatasetInfo

hashCode

public final int hashCode()

Overrides:

hashCode in class DatasetInfo