BigQueryIO.Write (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

java.lang.Object
- com.google.cloud.dataflow.sdk.io.BigQueryIO.Write

Enclosing class:

BigQueryIO
```
public static class BigQueryIO.Write
extends Object
```
A PTransform that writes a PCollection containing TableRows to a BigQuery table.
In BigQuery, each table has an enclosing dataset. The dataset being written must already exist.
By default, tables will be created if they do not exist, which corresponds to a BigQueryIO.Write.CreateDisposition.CREATE_IF_NEEDED disposition that matches the default of BigQuery's Jobs API. A schema must be provided (via withSchema(TableSchema)), or else the transform may fail at runtime with an IllegalArgumentException.
By default, writes require an empty table, which corresponds to a BigQueryIO.Write.WriteDisposition.WRITE_EMPTY disposition that matches the default of BigQuery's Jobs API.
Here is a sample transform that produces TableRow values containing "word" and "count" columns:
```
 static class FormatCountsFn extends DoFn<KV<String, Long>, TableRow> {
   public void processElement(ProcessContext c) {
     TableRow row = new TableRow()
         .set("word", c.element().getKey())
         .set("count", c.element().getValue().intValue());
     c.output(row);
   }
 }
```

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`BigQueryIO.Write.Bound` A `PTransform` that can write either a bounded or unbounded `PCollection` of `TableRows` to a BigQuery table.
`static class`	`BigQueryIO.Write.CreateDisposition` An enumeration type for the BigQuery create disposition strings.
`static class`	`BigQueryIO.Write.WriteDisposition` An enumeration type for the BigQuery write disposition strings.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static BigQueryIO.Write.Bound`	`named(String name)` Creates a write transformation with the given transform name.
`static BigQueryIO.Write.Bound`	`to(SerializableFunction<BoundedWindow,String> tableSpecFunction)` Creates a write transformation from a function that maps windows to table specifications.
`static BigQueryIO.Write.Bound`	`to(String tableSpec)` Creates a write transformation for the given table specification.
`static BigQueryIO.Write.Bound`	`to(TableReference table)` Creates a write transformation for the given table.
`static BigQueryIO.Write.Bound`	`to(ValueProvider<String> tableSpec)` Creates a write transformation for the given table.
`static BigQueryIO.Write.Bound`	`toTableReference(SerializableFunction<BoundedWindow,TableReference> tableRefFunction)` Creates a write transformation from a function that maps windows to `TableReference` objects.
`static BigQueryIO.Write.Bound`	`withCreateDisposition(BigQueryIO.Write.CreateDisposition disposition)` Creates a write transformation with the specified options for creating the table.
`static BigQueryIO.Write.Bound`	`withoutValidation()` Creates a write transformation with BigQuery table validation disabled.
`static BigQueryIO.Write.Bound`	`withSchema(TableSchema schema)` Creates a write transformation with the specified schema to use in table creation.
`static BigQueryIO.Write.Bound`	`withSchema(ValueProvider<TableSchema> schema)` Like `withSchema(TableSchema)`, but with a `ValueProvider`.
`static BigQueryIO.Write.Bound`	`withWriteDisposition(BigQueryIO.Write.WriteDisposition disposition)` Creates a write transformation with the specified options for writing to the table.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - named
```
public static BigQueryIO.Write.Bound named(String name)
```
    Creates a write transformation with the given transform name. The BigQuery table to be written has not yet been configured.
  - to
```
public static BigQueryIO.Write.Bound to(String tableSpec)
```
    Creates a write transformation for the given table specification.
    Refer to BigQueryIO.parseTableSpec(String) for the specification format.
  - to
```
public static BigQueryIO.Write.Bound to(ValueProvider<String> tableSpec)
```
    Creates a write transformation for the given table.
  - to
```
public static BigQueryIO.Write.Bound to(TableReference table)
```
    Creates a write transformation for the given table.
  - to
```
public static BigQueryIO.Write.Bound to(SerializableFunction<BoundedWindow,String> tableSpecFunction)
```
    Creates a write transformation from a function that maps windows to table specifications. Each time a new window is encountered, this function will be called and the resulting table will be created. Records within that window will be written to the associated table.
    See BigQueryIO.parseTableSpec(String) for the format that tableSpecFunction should return.
    tableSpecFunction should be deterministic. When given the same window, it should always return the same table specification.
  - toTableReference
```
public static BigQueryIO.Write.Bound toTableReference(SerializableFunction<BoundedWindow,TableReference> tableRefFunction)
```
    Creates a write transformation from a function that maps windows to TableReference objects.
    tableRefFunction should be deterministic. When given the same window, it should always return the same table reference.
  - withSchema
```
public static BigQueryIO.Write.Bound withSchema(TableSchema schema)
```
    Creates a write transformation with the specified schema to use in table creation.
    The schema is required only if writing to a table that does not already exist, and BigQueryIO.Write.CreateDisposition is set to BigQueryIO.Write.CreateDisposition.CREATE_IF_NEEDED.
  - withSchema
```
public static BigQueryIO.Write.Bound withSchema(ValueProvider<TableSchema> schema)
```
    Like withSchema(TableSchema), but with a ValueProvider.
  - withCreateDisposition
```
public static BigQueryIO.Write.Bound withCreateDisposition(BigQueryIO.Write.CreateDisposition disposition)
```
    Creates a write transformation with the specified options for creating the table.
  - withWriteDisposition
```
public static BigQueryIO.Write.Bound withWriteDisposition(BigQueryIO.Write.WriteDisposition disposition)
```
    Creates a write transformation with the specified options for writing to the table.
  - withoutValidation
```
public static BigQueryIO.Write.Bound withoutValidation()
```
    Creates a write transformation with BigQuery table validation disabled.

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Last updated 2020-09-08 UTC.

BigQueryIO.Write (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Class BigQueryIO.Write

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Method Detail

named

to

to

to

to

toTableReference

withSchema

withSchema

withCreateDisposition

withWriteDisposition

withoutValidation