Struct rusoto_dynamodb::DeleteItemInput [−][src]
pub struct DeleteItemInput { pub condition_expression: Option<String>, pub conditional_operator: Option<String>, pub expected: Option<HashMap<String, ExpectedAttributeValue>>, pub expression_attribute_names: Option<HashMap<String, String>>, pub expression_attribute_values: Option<HashMap<String, AttributeValue>>, pub key: HashMap<String, AttributeValue>, pub return_consumed_capacity: Option<String>, pub return_item_collection_metrics: Option<String>, pub return_values: Option<String>, pub table_name: String, }
Represents the input of a DeleteItem
operation.
Fields
condition_expression: Option<String>
A condition that must be satisfied in order for a conditional DeleteItem
to succeed.
An expression can contain any of the following:
-
Functions:
attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
These function names are case-sensitive.
-
Comparison operators:
= | <> | < | > | <= | >= | BETWEEN | IN
-
Logical operators:
AND | OR | NOT
For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
conditional_operator: Option<String>
This is a legacy parameter. Use ConditionExpression
instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
expected: Option<HashMap<String, ExpectedAttributeValue>>
This is a legacy parameter. Use ConditionExpression
instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
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.
expression_attribute_values: 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 Specifying Conditions in the Amazon DynamoDB Developer Guide.
key: HashMap<String, AttributeValue>
A map of attribute names to AttributeValue
objects, representing the primary key of the item to delete.
For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
return_consumed_capacity: Option<String>
return_item_collection_metrics: Option<String>
Determines whether item collection metrics are returned. If set to SIZE
, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE
(the default), no statistics are returned.
return_values: Option<String>
Use ReturnValues
if you want to get the item attributes as they appeared before they were deleted. For DeleteItem
, the valid values are:
-
NONE
- IfReturnValues
is not specified, or if its value isNONE
, then nothing is returned. (This setting is the default forReturnValues
.) -
ALLOLD
- The content of the old item is returned.
The ReturnValues
parameter is used by several DynamoDB operations; however, DeleteItem
does not recognize any values other than NONE
or ALLOLD
.
table_name: String
The name of the table from which to delete the item.
Trait Implementations
impl Default for DeleteItemInput
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impl Default for DeleteItemInput
fn default() -> DeleteItemInput
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fn default() -> DeleteItemInput
Returns the "default value" for a type. Read more
impl Debug for DeleteItemInput
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impl Debug for DeleteItemInput
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 Clone for DeleteItemInput
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impl Clone for DeleteItemInput
fn clone(&self) -> DeleteItemInput
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fn clone(&self) -> DeleteItemInput
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 PartialEq for DeleteItemInput
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impl PartialEq for DeleteItemInput
fn eq(&self, other: &DeleteItemInput) -> bool
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fn eq(&self, other: &DeleteItemInput) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &DeleteItemInput) -> bool
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fn ne(&self, other: &DeleteItemInput) -> bool
This method tests for !=
.
Auto Trait Implementations
impl Send for DeleteItemInput
impl Send for DeleteItemInput
impl Sync for DeleteItemInput
impl Sync for DeleteItemInput