ReadOption (Google Cloud Datastore Parent 2.17.1 API)

java.lang.Object
- com.google.cloud.datastore.ReadOption

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ReadOption.EventualConsistency, ReadOption.ReadTime
```
public abstract class ReadOption
extends Object
implements Serializable
```
Specifies options for read operations in Datastore, namely getting/fetching entities and running queries.

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`ReadOption.EventualConsistency`	Specifies eventual consistency for reads from Datastore.
`static class`	`ReadOption.QueryAndReadOptions<Q extends Query<?>>`
`static class`	`ReadOption.ReadTime`	Reads entities as they were at the given time.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static ReadOption.EventualConsistency`	`eventualConsistency()`	Returns a `ReadOption` that specifies eventual consistency, allowing Datastore to return stale results from gets, fetches, and ancestor queries.
`static ReadOption.ReadTime`	`readTime(com.google.cloud.Timestamp time)`	Returns a `ReadOption` that specifies read time, allowing Datastore to return results from lookups and queries at a particular timestamp.
`static ReadOption`	`transactionId(com.google.protobuf.ByteString transactionId)`	Returns a `ReadOption` that specifies transaction id, allowing Datastore to execute a `Query` in this transaction.
`static ReadOption`	`transactionId(String transactionId)`	Returns a `ReadOption` that specifies transaction id, allowing Datastore to execute a `Query` in this transaction.

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

- Method Detail
  - eventualConsistency
```
public static ReadOption.EventualConsistency eventualConsistency()
```
    Returns a ReadOption that specifies eventual consistency, allowing Datastore to return stale results from gets, fetches, and ancestor queries.
  - readTime
```
@BetaApi
public static ReadOption.ReadTime readTime(com.google.cloud.Timestamp time)
```
    Returns a ReadOption that specifies read time, allowing Datastore to return results from lookups and queries at a particular timestamp. This feature is currently in private preview.
  - transactionId
```
@InternalApi
public static ReadOption transactionId(String transactionId)
```
    Returns a ReadOption that specifies transaction id, allowing Datastore to execute a Query in this transaction.
  - transactionId
```
@InternalApi
public static ReadOption transactionId(com.google.protobuf.ByteString transactionId)
```
    Returns a ReadOption that specifies transaction id, allowing Datastore to execute a Query in this transaction.