Struct aws_sdk_dynamodb::operation::scan::builders::ScanInputBuilder
source · #[non_exhaustive]pub struct ScanInputBuilder { /* private fields */ }
Expand description
A builder for ScanInput
.
Implementations§
source§impl ScanInputBuilder
impl ScanInputBuilder
sourcepub fn table_name(self, input: impl Into<String>) -> Self
pub fn table_name(self, input: impl Into<String>) -> Self
The name of the table containing the requested items or if you provide IndexName
, the name of the table to which that index belongs.
You can also provide the Amazon Resource Name (ARN) of the table in this parameter.
This field is required.sourcepub fn set_table_name(self, input: Option<String>) -> Self
pub fn set_table_name(self, input: Option<String>) -> Self
The name of the table containing the requested items or if you provide IndexName
, the name of the table to which that index belongs.
You can also provide the Amazon Resource Name (ARN) of the table in this parameter.
sourcepub fn get_table_name(&self) -> &Option<String>
pub fn get_table_name(&self) -> &Option<String>
The name of the table containing the requested items or if you provide IndexName
, the name of the table to which that index belongs.
You can also provide the Amazon Resource Name (ARN) of the table in this parameter.
sourcepub fn index_name(self, input: impl Into<String>) -> Self
pub fn index_name(self, input: impl Into<String>) -> Self
The name of a secondary index to scan. This index can be any local secondary index or global secondary index. Note that if you use the IndexName
parameter, you must also provide TableName
.
sourcepub fn set_index_name(self, input: Option<String>) -> Self
pub fn set_index_name(self, input: Option<String>) -> Self
The name of a secondary index to scan. This index can be any local secondary index or global secondary index. Note that if you use the IndexName
parameter, you must also provide TableName
.
sourcepub fn get_index_name(&self) -> &Option<String>
pub fn get_index_name(&self) -> &Option<String>
The name of a secondary index to scan. This index can be any local secondary index or global secondary index. Note that if you use the IndexName
parameter, you must also provide TableName
.
sourcepub fn attributes_to_get(self, input: impl Into<String>) -> Self
pub fn attributes_to_get(self, input: impl Into<String>) -> Self
Appends an item to attributes_to_get
.
To override the contents of this collection use set_attributes_to_get
.
This is a legacy parameter. Use ProjectionExpression
instead. For more information, see AttributesToGet in the Amazon DynamoDB Developer Guide.
sourcepub fn set_attributes_to_get(self, input: Option<Vec<String>>) -> Self
pub fn set_attributes_to_get(self, input: Option<Vec<String>>) -> Self
This is a legacy parameter. Use ProjectionExpression
instead. For more information, see AttributesToGet in the Amazon DynamoDB Developer Guide.
sourcepub fn get_attributes_to_get(&self) -> &Option<Vec<String>>
pub fn get_attributes_to_get(&self) -> &Option<Vec<String>>
This is a legacy parameter. Use ProjectionExpression
instead. For more information, see AttributesToGet in the Amazon DynamoDB Developer Guide.
sourcepub fn limit(self, input: i32) -> Self
pub fn limit(self, input: i32) -> Self
The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey
to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey
to apply in a subsequent operation to continue the operation. For more information, see Working with Queries in the Amazon DynamoDB Developer Guide.
sourcepub fn set_limit(self, input: Option<i32>) -> Self
pub fn set_limit(self, input: Option<i32>) -> Self
The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey
to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey
to apply in a subsequent operation to continue the operation. For more information, see Working with Queries in the Amazon DynamoDB Developer Guide.
sourcepub fn get_limit(&self) -> &Option<i32>
pub fn get_limit(&self) -> &Option<i32>
The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey
to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey
to apply in a subsequent operation to continue the operation. For more information, see Working with Queries in the Amazon DynamoDB Developer Guide.
sourcepub fn select(self, input: Select) -> Self
pub fn select(self, input: Select) -> Self
The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
-
ALL_ATTRIBUTES
- Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required. -
ALL_PROJECTED_ATTRIBUTES
- Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifyingALL_ATTRIBUTES
. -
COUNT
- Returns the number of matching items, rather than the matching items themselves. Note that this uses the same quantity of read capacity units as getting the items, and is subject to the same item size calculations. -
SPECIFIC_ATTRIBUTES
- Returns only the attributes listed inProjectionExpression
. This return value is equivalent to specifyingProjectionExpression
without specifying any value forSelect
.If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
If neither Select
nor ProjectionExpression
are specified, DynamoDB defaults to ALL_ATTRIBUTES
when accessing a table, and ALL_PROJECTED_ATTRIBUTES
when accessing an index. You cannot use both Select
and ProjectionExpression
together in a single request, unless the value for Select
is SPECIFIC_ATTRIBUTES
. (This usage is equivalent to specifying ProjectionExpression
without any value for Select
.)
If you use the ProjectionExpression
parameter, then the value for Select
can only be SPECIFIC_ATTRIBUTES
. Any other value for Select
will return an error.
sourcepub fn set_select(self, input: Option<Select>) -> Self
pub fn set_select(self, input: Option<Select>) -> Self
The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
-
ALL_ATTRIBUTES
- Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required. -
ALL_PROJECTED_ATTRIBUTES
- Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifyingALL_ATTRIBUTES
. -
COUNT
- Returns the number of matching items, rather than the matching items themselves. Note that this uses the same quantity of read capacity units as getting the items, and is subject to the same item size calculations. -
SPECIFIC_ATTRIBUTES
- Returns only the attributes listed inProjectionExpression
. This return value is equivalent to specifyingProjectionExpression
without specifying any value forSelect
.If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
If neither Select
nor ProjectionExpression
are specified, DynamoDB defaults to ALL_ATTRIBUTES
when accessing a table, and ALL_PROJECTED_ATTRIBUTES
when accessing an index. You cannot use both Select
and ProjectionExpression
together in a single request, unless the value for Select
is SPECIFIC_ATTRIBUTES
. (This usage is equivalent to specifying ProjectionExpression
without any value for Select
.)
If you use the ProjectionExpression
parameter, then the value for Select
can only be SPECIFIC_ATTRIBUTES
. Any other value for Select
will return an error.
sourcepub fn get_select(&self) -> &Option<Select>
pub fn get_select(&self) -> &Option<Select>
The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
-
ALL_ATTRIBUTES
- Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required. -
ALL_PROJECTED_ATTRIBUTES
- Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifyingALL_ATTRIBUTES
. -
COUNT
- Returns the number of matching items, rather than the matching items themselves. Note that this uses the same quantity of read capacity units as getting the items, and is subject to the same item size calculations. -
SPECIFIC_ATTRIBUTES
- Returns only the attributes listed inProjectionExpression
. This return value is equivalent to specifyingProjectionExpression
without specifying any value forSelect
.If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
If neither Select
nor ProjectionExpression
are specified, DynamoDB defaults to ALL_ATTRIBUTES
when accessing a table, and ALL_PROJECTED_ATTRIBUTES
when accessing an index. You cannot use both Select
and ProjectionExpression
together in a single request, unless the value for Select
is SPECIFIC_ATTRIBUTES
. (This usage is equivalent to specifying ProjectionExpression
without any value for Select
.)
If you use the ProjectionExpression
parameter, then the value for Select
can only be SPECIFIC_ATTRIBUTES
. Any other value for Select
will return an error.
sourcepub fn scan_filter(self, k: impl Into<String>, v: Condition) -> Self
pub fn scan_filter(self, k: impl Into<String>, v: Condition) -> Self
Adds a key-value pair to scan_filter
.
To override the contents of this collection use set_scan_filter
.
This is a legacy parameter. Use FilterExpression
instead. For more information, see ScanFilter in the Amazon DynamoDB Developer Guide.
sourcepub fn set_scan_filter(self, input: Option<HashMap<String, Condition>>) -> Self
pub fn set_scan_filter(self, input: Option<HashMap<String, Condition>>) -> Self
This is a legacy parameter. Use FilterExpression
instead. For more information, see ScanFilter in the Amazon DynamoDB Developer Guide.
sourcepub fn get_scan_filter(&self) -> &Option<HashMap<String, Condition>>
pub fn get_scan_filter(&self) -> &Option<HashMap<String, Condition>>
This is a legacy parameter. Use FilterExpression
instead. For more information, see ScanFilter in the Amazon DynamoDB Developer Guide.
sourcepub fn conditional_operator(self, input: ConditionalOperator) -> Self
pub fn conditional_operator(self, input: ConditionalOperator) -> Self
This is a legacy parameter. Use FilterExpression
instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
sourcepub fn set_conditional_operator(
self,
input: Option<ConditionalOperator>,
) -> Self
pub fn set_conditional_operator( self, input: Option<ConditionalOperator>, ) -> Self
This is a legacy parameter. Use FilterExpression
instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
sourcepub fn get_conditional_operator(&self) -> &Option<ConditionalOperator>
pub fn get_conditional_operator(&self) -> &Option<ConditionalOperator>
This is a legacy parameter. Use FilterExpression
instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
sourcepub fn exclusive_start_key(
self,
k: impl Into<String>,
v: AttributeValue,
) -> Self
pub fn exclusive_start_key( self, k: impl Into<String>, v: AttributeValue, ) -> Self
Adds a key-value pair to exclusive_start_key
.
To override the contents of this collection use set_exclusive_start_key
.
The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey
in the previous operation.
The data type for ExclusiveStartKey
must be String, Number or Binary. No set data types are allowed.
In a parallel scan, a Scan
request that includes ExclusiveStartKey
must specify the same segment whose previous Scan
returned the corresponding value of LastEvaluatedKey
.
sourcepub fn set_exclusive_start_key(
self,
input: Option<HashMap<String, AttributeValue>>,
) -> Self
pub fn set_exclusive_start_key( self, input: Option<HashMap<String, AttributeValue>>, ) -> Self
The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey
in the previous operation.
The data type for ExclusiveStartKey
must be String, Number or Binary. No set data types are allowed.
In a parallel scan, a Scan
request that includes ExclusiveStartKey
must specify the same segment whose previous Scan
returned the corresponding value of LastEvaluatedKey
.
sourcepub fn get_exclusive_start_key(
&self,
) -> &Option<HashMap<String, AttributeValue>>
pub fn get_exclusive_start_key( &self, ) -> &Option<HashMap<String, AttributeValue>>
The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey
in the previous operation.
The data type for ExclusiveStartKey
must be String, Number or Binary. No set data types are allowed.
In a parallel scan, a Scan
request that includes ExclusiveStartKey
must specify the same segment whose previous Scan
returned the corresponding value of LastEvaluatedKey
.
sourcepub fn return_consumed_capacity(self, input: ReturnConsumedCapacity) -> Self
pub fn return_consumed_capacity(self, input: ReturnConsumedCapacity) -> Self
Determines the level of detail about either provisioned or on-demand throughput consumption that is returned in the response:
-
INDEXES
- The response includes the aggregateConsumedCapacity
for the operation, together withConsumedCapacity
for each table and secondary index that was accessed.Note that some operations, such as
GetItem
andBatchGetItem
, do not access any indexes at all. In these cases, specifyingINDEXES
will only returnConsumedCapacity
information for table(s). -
TOTAL
- The response includes only the aggregateConsumedCapacity
for the operation. -
NONE
- NoConsumedCapacity
details are included in the response.
sourcepub fn set_return_consumed_capacity(
self,
input: Option<ReturnConsumedCapacity>,
) -> Self
pub fn set_return_consumed_capacity( self, input: Option<ReturnConsumedCapacity>, ) -> Self
Determines the level of detail about either provisioned or on-demand throughput consumption that is returned in the response:
-
INDEXES
- The response includes the aggregateConsumedCapacity
for the operation, together withConsumedCapacity
for each table and secondary index that was accessed.Note that some operations, such as
GetItem
andBatchGetItem
, do not access any indexes at all. In these cases, specifyingINDEXES
will only returnConsumedCapacity
information for table(s). -
TOTAL
- The response includes only the aggregateConsumedCapacity
for the operation. -
NONE
- NoConsumedCapacity
details are included in the response.
sourcepub fn get_return_consumed_capacity(&self) -> &Option<ReturnConsumedCapacity>
pub fn get_return_consumed_capacity(&self) -> &Option<ReturnConsumedCapacity>
Determines the level of detail about either provisioned or on-demand throughput consumption that is returned in the response:
-
INDEXES
- The response includes the aggregateConsumedCapacity
for the operation, together withConsumedCapacity
for each table and secondary index that was accessed.Note that some operations, such as
GetItem
andBatchGetItem
, do not access any indexes at all. In these cases, specifyingINDEXES
will only returnConsumedCapacity
information for table(s). -
TOTAL
- The response includes only the aggregateConsumedCapacity
for the operation. -
NONE
- NoConsumedCapacity
details are included in the response.
sourcepub fn total_segments(self, input: i32) -> Self
pub fn total_segments(self, input: i32) -> Self
For a parallel Scan
request, TotalSegments
represents the total number of segments into which the Scan
operation will be divided. The value of TotalSegments
corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments
value of 4.
The value for TotalSegments
must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments
value of 1, the Scan
operation will be sequential rather than parallel.
If you specify TotalSegments
, you must also specify Segment
.
sourcepub fn set_total_segments(self, input: Option<i32>) -> Self
pub fn set_total_segments(self, input: Option<i32>) -> Self
For a parallel Scan
request, TotalSegments
represents the total number of segments into which the Scan
operation will be divided. The value of TotalSegments
corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments
value of 4.
The value for TotalSegments
must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments
value of 1, the Scan
operation will be sequential rather than parallel.
If you specify TotalSegments
, you must also specify Segment
.
sourcepub fn get_total_segments(&self) -> &Option<i32>
pub fn get_total_segments(&self) -> &Option<i32>
For a parallel Scan
request, TotalSegments
represents the total number of segments into which the Scan
operation will be divided. The value of TotalSegments
corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments
value of 4.
The value for TotalSegments
must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments
value of 1, the Scan
operation will be sequential rather than parallel.
If you specify TotalSegments
, you must also specify Segment
.
sourcepub fn segment(self, input: i32) -> Self
pub fn segment(self, input: i32) -> Self
For a parallel Scan
request, Segment
identifies an individual segment to be scanned by an application worker.
Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment
value of 0, the second thread specifies 1, and so on.
The value of LastEvaluatedKey
returned from a parallel Scan
request must be used as ExclusiveStartKey
with the same segment ID in a subsequent Scan
operation.
The value for Segment
must be greater than or equal to 0, and less than the value provided for TotalSegments
.
If you provide Segment
, you must also provide TotalSegments
.
sourcepub fn set_segment(self, input: Option<i32>) -> Self
pub fn set_segment(self, input: Option<i32>) -> Self
For a parallel Scan
request, Segment
identifies an individual segment to be scanned by an application worker.
Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment
value of 0, the second thread specifies 1, and so on.
The value of LastEvaluatedKey
returned from a parallel Scan
request must be used as ExclusiveStartKey
with the same segment ID in a subsequent Scan
operation.
The value for Segment
must be greater than or equal to 0, and less than the value provided for TotalSegments
.
If you provide Segment
, you must also provide TotalSegments
.
sourcepub fn get_segment(&self) -> &Option<i32>
pub fn get_segment(&self) -> &Option<i32>
For a parallel Scan
request, Segment
identifies an individual segment to be scanned by an application worker.
Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment
value of 0, the second thread specifies 1, and so on.
The value of LastEvaluatedKey
returned from a parallel Scan
request must be used as ExclusiveStartKey
with the same segment ID in a subsequent Scan
operation.
The value for Segment
must be greater than or equal to 0, and less than the value provided for TotalSegments
.
If you provide Segment
, you must also provide TotalSegments
.
sourcepub fn projection_expression(self, input: impl Into<String>) -> Self
pub fn projection_expression(self, input: impl Into<String>) -> Self
A string that identifies one or more attributes to retrieve from the specified table or index. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression 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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
sourcepub fn set_projection_expression(self, input: Option<String>) -> Self
pub fn set_projection_expression(self, input: Option<String>) -> Self
A string that identifies one or more attributes to retrieve from the specified table or index. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression 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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
sourcepub fn get_projection_expression(&self) -> &Option<String>
pub fn get_projection_expression(&self) -> &Option<String>
A string that identifies one or more attributes to retrieve from the specified table or index. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression 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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
sourcepub fn filter_expression(self, input: impl Into<String>) -> Self
pub fn filter_expression(self, input: impl Into<String>) -> Self
A string that contains conditions that DynamoDB applies after the Scan
operation, but before the data is returned to you. Items that do not satisfy the FilterExpression
criteria are not returned.
A FilterExpression
is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
sourcepub fn set_filter_expression(self, input: Option<String>) -> Self
pub fn set_filter_expression(self, input: Option<String>) -> Self
A string that contains conditions that DynamoDB applies after the Scan
operation, but before the data is returned to you. Items that do not satisfy the FilterExpression
criteria are not returned.
A FilterExpression
is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
sourcepub fn get_filter_expression(&self) -> &Option<String>
pub fn get_filter_expression(&self) -> &Option<String>
A string that contains conditions that DynamoDB applies after the Scan
operation, but before the data is returned to you. Items that do not satisfy the FilterExpression
criteria are not returned.
A FilterExpression
is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
sourcepub fn expression_attribute_names(
self,
k: impl Into<String>,
v: impl Into<String>,
) -> Self
pub fn expression_attribute_names( self, k: impl Into<String>, v: impl Into<String>, ) -> Self
Adds a key-value pair to expression_attribute_names
.
To override the contents of this collection use set_expression_attribute_names
.
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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
sourcepub fn set_expression_attribute_names(
self,
input: Option<HashMap<String, String>>,
) -> Self
pub fn set_expression_attribute_names( self, input: Option<HashMap<String, String>>, ) -> Self
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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
sourcepub fn get_expression_attribute_names(&self) -> &Option<HashMap<String, String>>
pub fn get_expression_attribute_names(&self) -> &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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
sourcepub fn expression_attribute_values(
self,
k: impl Into<String>,
v: AttributeValue,
) -> Self
pub fn expression_attribute_values( self, k: impl Into<String>, v: AttributeValue, ) -> Self
Adds a key-value pair to expression_attribute_values
.
To override the contents of this collection use set_expression_attribute_values
.
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus
attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues
as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Condition Expressions in the Amazon DynamoDB Developer Guide.
sourcepub fn set_expression_attribute_values(
self,
input: Option<HashMap<String, AttributeValue>>,
) -> Self
pub fn set_expression_attribute_values( self, input: Option<HashMap<String, AttributeValue>>, ) -> Self
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus
attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues
as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Condition Expressions in the Amazon DynamoDB Developer Guide.
sourcepub fn get_expression_attribute_values(
&self,
) -> &Option<HashMap<String, AttributeValue>>
pub fn get_expression_attribute_values( &self, ) -> &Option<HashMap<String, AttributeValue>>
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus
attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues
as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Condition Expressions in the Amazon DynamoDB Developer Guide.
sourcepub fn consistent_read(self, input: bool) -> Self
pub fn consistent_read(self, input: bool) -> Self
A Boolean value that determines the read consistency model during the scan:
-
If
ConsistentRead
isfalse
, then the data returned fromScan
might not contain the results from other recently completed write operations (PutItem
,UpdateItem
, orDeleteItem
). -
If
ConsistentRead
istrue
, then all of the write operations that completed before theScan
began are guaranteed to be contained in theScan
response.
The default setting for ConsistentRead
is false
.
The ConsistentRead
parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead
set to true, you will receive a ValidationException
.
sourcepub fn set_consistent_read(self, input: Option<bool>) -> Self
pub fn set_consistent_read(self, input: Option<bool>) -> Self
A Boolean value that determines the read consistency model during the scan:
-
If
ConsistentRead
isfalse
, then the data returned fromScan
might not contain the results from other recently completed write operations (PutItem
,UpdateItem
, orDeleteItem
). -
If
ConsistentRead
istrue
, then all of the write operations that completed before theScan
began are guaranteed to be contained in theScan
response.
The default setting for ConsistentRead
is false
.
The ConsistentRead
parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead
set to true, you will receive a ValidationException
.
sourcepub fn get_consistent_read(&self) -> &Option<bool>
pub fn get_consistent_read(&self) -> &Option<bool>
A Boolean value that determines the read consistency model during the scan:
-
If
ConsistentRead
isfalse
, then the data returned fromScan
might not contain the results from other recently completed write operations (PutItem
,UpdateItem
, orDeleteItem
). -
If
ConsistentRead
istrue
, then all of the write operations that completed before theScan
began are guaranteed to be contained in theScan
response.
The default setting for ConsistentRead
is false
.
The ConsistentRead
parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead
set to true, you will receive a ValidationException
.
source§impl ScanInputBuilder
impl ScanInputBuilder
sourcepub async fn send_with(
self,
client: &Client,
) -> Result<ScanOutput, SdkError<ScanError, HttpResponse>>
pub async fn send_with( self, client: &Client, ) -> Result<ScanOutput, SdkError<ScanError, HttpResponse>>
Sends a request with this input using the given client.
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