Class ReadOption (2.32.3) 

publicabstractclass ReadOptionimplementsSerializable

Specifies options for read operations in Datastore, namely getting/fetching entities and running queries.

Inheritance

java.lang.Object > ReadOption

Implements

Serializable

Static Methods

eventualConsistency()

publicstaticReadOption.EventualConsistencyeventualConsistency()

Returns a ReadOption that specifies eventual consistency, allowing Datastore to return stale results from gets, fetches, and ancestor queries.

Returns
Type Description
ReadOption.EventualConsistency

readTime(Timestamp time)

publicstaticReadOption.ReadTimereadTime(Timestamptime)

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.

Parameter
Name Description
time com.google.cloud.Timestamp
Returns
Type Description
ReadOption.ReadTime

transactionId(ByteString transactionId)

publicstaticReadOptiontransactionId(ByteStringtransactionId)

Returns a ReadOption that specifies transaction id, allowing Datastore to execute a Query in this transaction.

Parameter
Name Description
transactionId ByteString
Returns
Type Description
ReadOption

transactionId(String transactionId)

publicstaticReadOptiontransactionId(StringtransactionId)

Returns a ReadOption that specifies transaction id, allowing Datastore to execute a Query in this transaction.

Parameter
Name Description
transactionId String
Returns
Type Description
ReadOption

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Last updated 2025年11月19日 UTC.