[−][src]Struct google_spanner1::ReadRequest
The request for Read and StreamingRead.
Activities
This type is used in activities, which are methods you may call on this type or where this type is involved in. The list links the activity name, along with information about where it is used (one of request and response).
Fields
index: Option<String>
If non-empty, the name of an index on table. This index is used instead of the table primary key when interpreting key_set and sorting result rows. See key_set for further information.
transaction: Option<TransactionSelector>
The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
resume_token: Option<String>
If this request is resuming a previously interrupted read,
resume_token
should be copied from the last
PartialResultSet yielded before the interruption. Doing this
enables the new read to resume where the last read left off. The
rest of the request parameters must exactly match the request
that yielded this token.
partition_token: Option<String>
If present, results will be restricted to the specified partition previously created using PartitionRead(). There must be an exact match for the values of fields common to this message and the PartitionReadRequest message used to create this partition_token.
key_set: Option<KeySet>
Required. key_set
identifies the rows to be yielded. key_set
names the
primary keys of the rows in table to be yielded, unless index
is present. If index is present, then key_set instead names
index keys in index.
If the partition_token field is empty, rows are yielded in table primary key order (if index is empty) or index key order (if index is non-empty). If the partition_token field is not empty, rows will be yielded in an unspecified order.
It is not an error for the key_set
to name rows that do not
exist in the database. Read yields nothing for nonexistent rows.
limit: Option<String>
If greater than zero, only the first limit
rows are yielded. If limit
is zero, the default is no limit. A limit cannot be specified if
partition_token
is set.
table: Option<String>
Required. The name of the table in the database to be read.
columns: Option<Vec<String>>
The columns of table to be returned for each row matching this request.
Trait Implementations
impl RequestValue for ReadRequest
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impl Default for ReadRequest
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fn default() -> ReadRequest
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impl Clone for ReadRequest
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fn clone(&self) -> ReadRequest
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for ReadRequest
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impl Serialize for ReadRequest
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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
__S: Serializer,
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__S: Serializer,
impl<'de> Deserialize<'de> for ReadRequest
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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
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__D: Deserializer<'de>,
Auto Trait Implementations
impl Send for ReadRequest
impl Unpin for ReadRequest
impl Sync for ReadRequest
impl UnwindSafe for ReadRequest
impl RefUnwindSafe for ReadRequest
Blanket Implementations
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Typeable for T where
T: Any,
T: Any,
impl<T> DeserializeOwned for T where
T: Deserialize<'de>,
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T: Deserialize<'de>,