[−][src]Struct rusoto_dynamodb::KeysAndAttributes
Represents a set of primary keys and, for each key, the attributes to retrieve from the table.
For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide the partition key. For a composite primary key, you must provide both the partition key and the sort key.
Fields
attributes_to_get: Option<Vec<String>>
This is a legacy parameter. Use ProjectionExpression
instead. For more information, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
consistent_read: Option<bool>
The consistency of a read operation. If set to true
, then a strongly consistent read is used; otherwise, an eventually consistent read is used.
expression_attribute_names: Option<HashMap<String, String>>
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames
:
-
To access an attribute whose name conflicts with a DynamoDB reserved word.
-
To create a placeholder for repeating occurrences of an attribute name in an expression.
-
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
-
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames
:
-
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
-
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
keys: Vec<HashMap<String, AttributeValue>>
The primary key attribute values that define the items and the attributes associated with the items.
projection_expression: Option<String>
A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the ProjectionExpression
must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Trait Implementations
impl Default for KeysAndAttributes
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impl Default for KeysAndAttributes
fn default() -> KeysAndAttributes
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fn default() -> KeysAndAttributes
Returns the "default value" for a type. Read more
impl PartialEq<KeysAndAttributes> for KeysAndAttributes
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impl PartialEq<KeysAndAttributes> for KeysAndAttributes
fn eq(&self, other: &KeysAndAttributes) -> bool
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fn eq(&self, other: &KeysAndAttributes) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &KeysAndAttributes) -> bool
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fn ne(&self, other: &KeysAndAttributes) -> bool
This method tests for !=
.
impl Clone for KeysAndAttributes
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impl Clone for KeysAndAttributes
fn clone(&self) -> KeysAndAttributes
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fn clone(&self) -> KeysAndAttributes
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Debug for KeysAndAttributes
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impl Debug for KeysAndAttributes
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl Serialize for KeysAndAttributes
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impl Serialize for KeysAndAttributes
fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
__S: Serializer,
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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
__S: Serializer,
Serialize this value into the given Serde serializer. Read more
impl<'de> Deserialize<'de> for KeysAndAttributes
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impl<'de> Deserialize<'de> for KeysAndAttributes
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
Auto Trait Implementations
impl Send for KeysAndAttributes
impl Send for KeysAndAttributes
impl Sync for KeysAndAttributes
impl Sync for KeysAndAttributes
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
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impl<T, U> Into for T where
U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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impl<T> ToOwned for T where
T: Clone,
type Owned = T
fn to_owned(&self) -> T
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fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)
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fn clone_into(&self, target: &mut T)
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T> From for T
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impl<T> From for T
impl<T, U> TryFrom for T where
T: From<U>,
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impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
try_from
)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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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
try_from
)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized,
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impl<T> Borrow for T where
T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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impl<T> BorrowMut for T where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
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impl<T, U> TryInto for T where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
try_from
)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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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
try_from
)Performs the conversion.
impl<T> Any for T where
T: 'static + ?Sized,
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impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId
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fn get_type_id(&self) -> TypeId
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
Gets the TypeId
of self
. Read more
impl<T> DeserializeOwned for T where
T: Deserialize<'de>,
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impl<T> DeserializeOwned for T where
T: Deserialize<'de>,
impl<T> Same for T
impl<T> Same for T
type Output = T
Should always be Self
impl<T> Erased for T
impl<T> Erased for T