Reference documentation and code samples for the Cloud Spanner V1 Client class PBReadOnly.
Message type to initiate a read-only transaction.
Generated from protobuf message google.spanner.v1.TransactionOptions.ReadOnly
Methods
__construct
Constructor.
| Parameters | |
|---|---|
| Name | Description |
data |
array
Optional. Data for populating the Message object. |
↳ strong |
bool
Read at a timestamp where all previously committed transactions are visible. |
↳ min_read_timestamp |
Google\Protobuf\Timestamp
Executes all reads at a timestamp >= |
↳ max_staleness |
Google\Protobuf\Duration
Read data at a timestamp >= |
↳ read_timestamp |
Google\Protobuf\Timestamp
Executes all reads at the given timestamp. Unlike other modes, reads at a specific timestamp are repeatable; the same read at the same timestamp always returns the same data. If the timestamp is in the future, the read will block until the specified timestamp, modulo the read's deadline. Useful for large scale consistent reads such as mapreduces, or for coordinating many reads against a consistent snapshot of the data. A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: |
↳ exact_staleness |
Google\Protobuf\Duration
Executes all reads at a timestamp that is |
↳ return_read_timestamp |
bool
If true, the Cloud Spanner-selected read timestamp is included in the Transaction message that describes the transaction. |
getStrong
Read at a timestamp where all previously committed transactions are visible.
| Returns | |
|---|---|
| Type | Description |
bool | |
hasStrong
setStrong
Read at a timestamp where all previously committed transactions are visible.
| Parameter | |
|---|---|
| Name | Description |
var |
bool
|
| Returns | |
|---|---|
| Type | Description |
$this | |
getMinReadTimestamp
Executes all reads at a timestamp >= min_read_timestamp.
This is useful for requesting fresher data than some previous
read, or data that is fresh enough to observe the effects of some
previously committed transaction whose timestamp is known.
Note that this option can only be used in single-use transactions.
A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds.
Example: "2014-10-02T15:01:23.045123456Z".
| Returns | |
|---|---|
| Type | Description |
Google\Protobuf\Timestamp|null | |
hasMinReadTimestamp
setMinReadTimestamp
Executes all reads at a timestamp >= min_read_timestamp.
This is useful for requesting fresher data than some previous
read, or data that is fresh enough to observe the effects of some
previously committed transaction whose timestamp is known.
Note that this option can only be used in single-use transactions.
A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds.
Example: "2014-10-02T15:01:23.045123456Z".
| Parameter | |
|---|---|
| Name | Description |
var |
Google\Protobuf\Timestamp
|
| Returns | |
|---|---|
| Type | Description |
$this | |
getMaxStaleness
Read data at a timestamp >= NOW - max_staleness
seconds. Guarantees that all writes that have committed more
than the specified number of seconds ago are visible. Because
Cloud Spanner chooses the exact timestamp, this mode works even if
the client's local clock is substantially skewed from Cloud Spanner
commit timestamps.
Useful for reading the freshest data available at a nearby replica, while bounding the possible staleness if the local replica has fallen behind. Note that this option can only be used in single-use transactions.
| Returns | |
|---|---|
| Type | Description |
Google\Protobuf\Duration|null | |
hasMaxStaleness
setMaxStaleness
Read data at a timestamp >= NOW - max_staleness
seconds. Guarantees that all writes that have committed more
than the specified number of seconds ago are visible. Because
Cloud Spanner chooses the exact timestamp, this mode works even if
the client's local clock is substantially skewed from Cloud Spanner
commit timestamps.
Useful for reading the freshest data available at a nearby replica, while bounding the possible staleness if the local replica has fallen behind. Note that this option can only be used in single-use transactions.
| Parameter | |
|---|---|
| Name | Description |
var |
Google\Protobuf\Duration
|
| Returns | |
|---|---|
| Type | Description |
$this | |
getReadTimestamp
Executes all reads at the given timestamp. Unlike other modes, reads at a specific timestamp are repeatable; the same read at the same timestamp always returns the same data. If the timestamp is in the future, the read will block until the specified timestamp, modulo the read's deadline.
Useful for large scale consistent reads such as mapreduces, or
for coordinating many reads against a consistent snapshot of the
data.
A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds.
Example: "2014-10-02T15:01:23.045123456Z".
| Returns | |
|---|---|
| Type | Description |
Google\Protobuf\Timestamp|null | |
hasReadTimestamp
setReadTimestamp
Executes all reads at the given timestamp. Unlike other modes, reads at a specific timestamp are repeatable; the same read at the same timestamp always returns the same data. If the timestamp is in the future, the read will block until the specified timestamp, modulo the read's deadline.
Useful for large scale consistent reads such as mapreduces, or
for coordinating many reads against a consistent snapshot of the
data.
A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds.
Example: "2014-10-02T15:01:23.045123456Z".
| Parameter | |
|---|---|
| Name | Description |
var |
Google\Protobuf\Timestamp
|
| Returns | |
|---|---|
| Type | Description |
$this | |
getExactStaleness
Executes all reads at a timestamp that is exact_staleness
old. The timestamp is chosen soon after the read is started.
Guarantees that all writes that have committed more than the
specified number of seconds ago are visible. Because Cloud Spanner
chooses the exact timestamp, this mode works even if the client's
local clock is substantially skewed from Cloud Spanner commit
timestamps.
Useful for reading at nearby replicas without the distributed
timestamp negotiation overhead of max_staleness.
| Returns | |
|---|---|
| Type | Description |
Google\Protobuf\Duration|null | |
hasExactStaleness
setExactStaleness
Executes all reads at a timestamp that is exact_staleness
old. The timestamp is chosen soon after the read is started.
Guarantees that all writes that have committed more than the
specified number of seconds ago are visible. Because Cloud Spanner
chooses the exact timestamp, this mode works even if the client's
local clock is substantially skewed from Cloud Spanner commit
timestamps.
Useful for reading at nearby replicas without the distributed
timestamp negotiation overhead of max_staleness.
| Parameter | |
|---|---|
| Name | Description |
var |
Google\Protobuf\Duration
|
| Returns | |
|---|---|
| Type | Description |
$this | |
getReturnReadTimestamp
If true, the Cloud Spanner-selected read timestamp is included in the Transaction message that describes the transaction.
| Returns | |
|---|---|
| Type | Description |
bool | |
setReturnReadTimestamp
If true, the Cloud Spanner-selected read timestamp is included in the Transaction message that describes the transaction.
| Parameter | |
|---|---|
| Name | Description |
var |
bool
|
| Returns | |
|---|---|
| Type | Description |
$this | |
getTimestampBound
| Returns | |
|---|---|
| Type | Description |
string | |