Network.AWS.DynamoDB.UpdateItem

Edits an existing item's attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values. You can also perform a conditional update on an existing item (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values).

You can also return the item's attribute values in the same UpdateItem operation using the ReturnValues parameter.

Creating a Request

updateItem

Arguments

:: Text

uiTableName

-> UpdateItem

Creates a value of UpdateItem with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

• uiExpressionAttributeNames - 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 For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
• uiReturnValues - Use ReturnValues if you want to get the item attributes as they appeared either before or after they were updated. For UpdateItem , the valid values are: * NONE - If ReturnValues is not specified, or if its value is NONE , then nothing is returned. (This setting is the default for ReturnValues .) * ALL_OLD - If UpdateItem overwrote an attribute name-value pair, then the content of the old item is returned. * UPDATED_OLD - The old versions of only the updated attributes are returned. * ALL_NEW - All of the attributes of the new version of the item are returned. * UPDATED_NEW - The new versions of only the updated attributes are returned. There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No Read Capacity Units are consumed. Values returned are strongly consistent
• uiUpdateExpression - An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them. The following action values are available for UpdateExpression . * SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val SET supports the following functions: * if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item. * list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands. These function names are case-sensitive. * REMOVE - Removes one or more attributes from an item. * ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute: * If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute. * If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3] , then the final attribute value is [1,2,3] . An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings. Important: The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes. * DELETE - Deletes an element from a set. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c] , then the final attribute value is [b] . Specifying an empty set is an error. Important: The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes. You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5 For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide .
• uiExpressionAttributeValues - 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 .
• uiAttributeUpdates - Important: This is a legacy parameter, for backward compatibility. New applications should use UpdateExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. This parameter can be used for modifying top-level attributes; however, it does not support individual list or map elements. The names of attributes to be modified, the action to perform on each, and the new value for each. If you are updating an attribute that is an index key attribute for any indexes on that table, the attribute type must match the index key type defined in the AttributesDefinition of the table description. You can use UpdateItem to update any non-key attributes. Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes must not be empty. Requests with empty values will be rejected with a ValidationException exception. Each AttributeUpdates element consists of an attribute name to modify, along with the following: * Value - The new value, if applicable, for this attribute. * Action - A value that specifies how to perform the update. This action is only valid for an existing attribute whose data type is Number or is a set; do not use ADD for other data types. If an item with the specified primary key is found in the table, the following values perform the following actions: * PUT - Adds the specified attribute to the item. If the attribute already exists, it is replaced by the new value. * DELETE - Removes the attribute and its value, if no value is specified for DELETE . The data type of the specified value must match the existing value's data type. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c] , then the final attribute value is [b] . Specifying an empty set is an error. * ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute: * If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute. * If the existing data type is a set, and if Value is also a set, then Value is appended to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3] , then the final attribute value is [1,2,3] . An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, Value must also be a set of strings. If no item with the specified key is found in the table, the following values perform the following actions: * PUT - Causes DynamoDB to create a new item with the specified primary key, and then adds the attribute. * DELETE - Nothing happens, because attributes cannot be deleted from a nonexistent item. The operation succeeds, but DynamoDB does not create a new item. * ADD - Causes DynamoDB to create an item with the supplied primary key and number (or set of numbers) for the attribute value. The only data types allowed are Number and Number Set. If you provide any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
• uiReturnConsumedCapacity - Undocumented member.
• uiReturnItemCollectionMetrics - 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.
• uiConditionExpression - A condition that must be satisfied in order for a conditional update 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 .
• uiConditionalOperator - Important: This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. A logical operator to apply to the conditions in the Expected map: * AND - If all of the conditions evaluate to true, then the entire map evaluates to true. * OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true. If you omit ConditionalOperator , then AND is the default. The operation will succeed only if the entire map evaluates to true.
• uiExpected - Important: This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. A map of attributecondition pairs. Expected provides a conditional block for the UpdateItem operation. Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false. If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.) If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails. Expected contains the following: * AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used. For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see <http:en.wikipedia.orgwikiASCII#ASCII_printable_characters http:en.wikipedia.orgwikiASCII#ASCII_printable_characters> . For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values. * ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList . When performing the comparison, DynamoDB uses strongly consistent reads. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN The following are descriptions of each comparison operator. * EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not equal {NS:["6", "2", "1"]} . * NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not equal {NS:["6", "2", "1"]} . * LE : Less than or equal. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * LT : Less than. AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * GE : Greater than or equal. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * GT : Greater than. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps. * NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps. * CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS ", "NS ", or "BS "), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating "a CONTAINS b ", "a " can be a list; however, "b " cannot be a set, a map, or a list. * NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS ", "NS ", or "BS "), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating "a NOT CONTAINS b ", "a " can be a list; however, "b " cannot be a set, a map, or a list. * BEGINS_WITH : Checks for a prefix. AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type). * IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true. * BETWEEN : Greater than or equal to the first value, and less than or equal to the second value. AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not compare to {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} For usage examples of AttributeValueList and ComparisonOperator , see <http:docs.aws.amazon.comamazondynamodblatestdeveloperguideLegacyConditionalParameters.html Legacy Conditional Parameters> in the Amazon DynamoDB Developer Guide . For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator : * Value - A value for DynamoDB to compare with an attribute. * Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation: * If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the condition evaluates to true; otherwise the condition evaluate to false. * If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the condition evaluates to true. If the value is found, despite the assumption that it does not exist, the condition evaluates to false. Note that the default value for Exists is true . The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException/ exception.
• uiTableName - The name of the table containing the item to update.
• uiKey - The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute. 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.

data UpdateItem

Represents the input of an UpdateItem operation.

See: updateItem smart constructor.

Instances

Eq UpdateItem

Methods

(==) :: UpdateItem -> UpdateItem -> Bool

(/=) :: UpdateItem -> UpdateItem -> Bool

Data UpdateItem

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UpdateItem -> c UpdateItem

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UpdateItem

toConstr :: UpdateItem -> Constr

dataTypeOf :: UpdateItem -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c UpdateItem)

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UpdateItem)

gmapT :: (forall b. Data b => b -> b) -> UpdateItem -> UpdateItem

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UpdateItem -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UpdateItem -> r

gmapQ :: (forall d. Data d => d -> u) -> UpdateItem -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> UpdateItem -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UpdateItem -> m UpdateItem

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UpdateItem -> m UpdateItem

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UpdateItem -> m UpdateItem

Read UpdateItem

Methods

readsPrec :: Int -> ReadS UpdateItem

readList :: ReadS [UpdateItem]

readPrec :: ReadPrec UpdateItem

readListPrec :: ReadPrec [UpdateItem]

Show UpdateItem

Methods

showsPrec :: Int -> UpdateItem -> ShowS

show :: UpdateItem -> String

showList :: [UpdateItem] -> ShowS

Generic UpdateItem

Associated Types

type Rep UpdateItem :: * -> *

Methods

from :: UpdateItem -> Rep UpdateItem x

to :: Rep UpdateItem x -> UpdateItem

Hashable UpdateItem

Methods

hashWithSalt :: Int -> UpdateItem -> Int

hash :: UpdateItem -> Int

ToJSON UpdateItem

Methods

toJSON :: UpdateItem -> Value

toEncoding :: UpdateItem -> Encoding

toJSONList :: [UpdateItem] -> Value

toEncodingList :: [UpdateItem] -> Encoding

NFData UpdateItem

Methods

rnf :: UpdateItem -> ()

AWSRequest UpdateItem

Associated Types

type Rs UpdateItem :: *

Methods

request :: UpdateItem -> Request UpdateItem

response :: MonadResource m => Logger -> Service -> Proxy * UpdateItem -> ClientResponse -> m (Response UpdateItem)

ToPath UpdateItem

Methods

toPath :: UpdateItem -> ByteString

ToHeaders UpdateItem

Methods

toHeaders :: UpdateItem -> [Header]

ToQuery UpdateItem

Methods

toQuery :: UpdateItem -> QueryString

type Rep UpdateItem

type Rep UpdateItem = D1 (MetaData "UpdateItem" "Network.AWS.DynamoDB.UpdateItem" "amazonka-dynamodb-1.4.5-9Gf0U64x7l0KacBmJaIMNw" False) (C1 (MetaCons "UpdateItem'" PrefixI True) ((:*:) ((:*:) ((:*:) (S1 (MetaSel (Just Symbol "_uiExpressionAttributeNames") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text Text)))) ((:*:) (S1 (MetaSel (Just Symbol "_uiReturnValues") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ReturnValue))) (S1 (MetaSel (Just Symbol "_uiUpdateExpression") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe Text))))) ((:*:) (S1 (MetaSel (Just Symbol "_uiExpressionAttributeValues") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text AttributeValue)))) ((:*:) (S1 (MetaSel (Just Symbol "_uiAttributeUpdates") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text AttributeValueUpdate)))) (S1 (MetaSel (Just Symbol "_uiReturnConsumedCapacity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ReturnConsumedCapacity)))))) ((:*:) ((:*:) (S1 (MetaSel (Just Symbol "_uiReturnItemCollectionMetrics") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ReturnItemCollectionMetrics))) ((:*:) (S1 (MetaSel (Just Symbol "_uiConditionExpression") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe Text))) (S1 (MetaSel (Just Symbol "_uiConditionalOperator") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ConditionalOperator))))) ((:*:) (S1 (MetaSel (Just Symbol "_uiExpected") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text ExpectedAttributeValue)))) ((:*:) (S1 (MetaSel (Just Symbol "_uiTableName") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Text)) (S1 (MetaSel (Just Symbol "_uiKey") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Map Text AttributeValue))))))))

type Rs UpdateItem

type Rs UpdateItem = UpdateItemResponse

Request Lenses

uiExpressionAttributeNames :: Lens' UpdateItem (HashMap Text Text)

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 For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .

uiReturnValues :: Lens' UpdateItem (Maybe ReturnValue)

Use ReturnValues if you want to get the item attributes as they appeared either before or after they were updated. For UpdateItem , the valid values are: * NONE - If ReturnValues is not specified, or if its value is NONE , then nothing is returned. (This setting is the default for ReturnValues .) * ALL_OLD - If UpdateItem overwrote an attribute name-value pair, then the content of the old item is returned. * UPDATED_OLD - The old versions of only the updated attributes are returned. * ALL_NEW - All of the attributes of the new version of the item are returned. * UPDATED_NEW - The new versions of only the updated attributes are returned. There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No Read Capacity Units are consumed. Values returned are strongly consistent

uiUpdateExpression :: Lens' UpdateItem (Maybe Text)

An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them. The following action values are available for UpdateExpression . * SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val SET supports the following functions: * if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item. * list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands. These function names are case-sensitive. * REMOVE - Removes one or more attributes from an item. * ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute: * If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute. * If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3] , then the final attribute value is [1,2,3] . An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings. Important: The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes. * DELETE - Deletes an element from a set. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c] , then the final attribute value is [b] . Specifying an empty set is an error. Important: The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes. You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5 For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide .

uiExpressionAttributeValues :: Lens' UpdateItem (HashMap Text 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 .

uiAttributeUpdates :: Lens' UpdateItem (HashMap Text AttributeValueUpdate)

Important: This is a legacy parameter, for backward compatibility. New applications should use UpdateExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. This parameter can be used for modifying top-level attributes; however, it does not support individual list or map elements. The names of attributes to be modified, the action to perform on each, and the new value for each. If you are updating an attribute that is an index key attribute for any indexes on that table, the attribute type must match the index key type defined in the AttributesDefinition of the table description. You can use UpdateItem to update any non-key attributes. Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes must not be empty. Requests with empty values will be rejected with a ValidationException exception. Each AttributeUpdates element consists of an attribute name to modify, along with the following: * Value - The new value, if applicable, for this attribute. * Action - A value that specifies how to perform the update. This action is only valid for an existing attribute whose data type is Number or is a set; do not use ADD for other data types. If an item with the specified primary key is found in the table, the following values perform the following actions: * PUT - Adds the specified attribute to the item. If the attribute already exists, it is replaced by the new value. * DELETE - Removes the attribute and its value, if no value is specified for DELETE . The data type of the specified value must match the existing value's data type. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c] , then the final attribute value is [b] . Specifying an empty set is an error. * ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute: * If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute. * If the existing data type is a set, and if Value is also a set, then Value is appended to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3] , then the final attribute value is [1,2,3] . An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, Value must also be a set of strings. If no item with the specified key is found in the table, the following values perform the following actions: * PUT - Causes DynamoDB to create a new item with the specified primary key, and then adds the attribute. * DELETE - Nothing happens, because attributes cannot be deleted from a nonexistent item. The operation succeeds, but DynamoDB does not create a new item. * ADD - Causes DynamoDB to create an item with the supplied primary key and number (or set of numbers) for the attribute value. The only data types allowed are Number and Number Set. If you provide any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.

uiReturnConsumedCapacity :: Lens' UpdateItem (Maybe ReturnConsumedCapacity)

Undocumented member.

uiReturnItemCollectionMetrics :: Lens' UpdateItem (Maybe ReturnItemCollectionMetrics)

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.

uiConditionExpression :: Lens' UpdateItem (Maybe Text)

A condition that must be satisfied in order for a conditional update 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 .

uiConditionalOperator :: Lens' UpdateItem (Maybe ConditionalOperator)

Important: This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. A logical operator to apply to the conditions in the Expected map: * AND - If all of the conditions evaluate to true, then the entire map evaluates to true. * OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true. If you omit ConditionalOperator , then AND is the default. The operation will succeed only if the entire map evaluates to true.

uiExpected :: Lens' UpdateItem (HashMap Text ExpectedAttributeValue)

Important: This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. A map of attributecondition pairs. Expected provides a conditional block for the UpdateItem operation. Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false. If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.) If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails. Expected contains the following: * AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used. For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see <http:en.wikipedia.orgwikiASCII#ASCII_printable_characters http:en.wikipedia.orgwikiASCII#ASCII_printable_characters> . For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values. * ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList . When performing the comparison, DynamoDB uses strongly consistent reads. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN The following are descriptions of each comparison operator. * EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not equal {NS:["6", "2", "1"]} . * NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not equal {NS:["6", "2", "1"]} . * LE : Less than or equal. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * LT : Less than. AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * GE : Greater than or equal. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * GT : Greater than. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not equal {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} . * NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps. * NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps. * CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS ", "NS ", or "BS "), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating "a CONTAINS b ", "a " can be a list; however, "b " cannot be a set, a map, or a list. * NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ("SS ", "NS ", or "BS "), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating "a NOT CONTAINS b ", "a " can be a list; however, "b " cannot be a set, a map, or a list. * BEGINS_WITH : Checks for a prefix. AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type). * IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true. * BETWEEN : Greater than or equal to the first value, and less than or equal to the second value. AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {S:"6"} does not compare to {N:"6"} . Also, {N:"6"} does not compare to {NS:["6", "2", "1"]} For usage examples of AttributeValueList and ComparisonOperator , see <http:docs.aws.amazon.comamazondynamodblatestdeveloperguideLegacyConditionalParameters.html Legacy Conditional Parameters> in the Amazon DynamoDB Developer Guide . For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator : * Value - A value for DynamoDB to compare with an attribute. * Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation: * If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the condition evaluates to true; otherwise the condition evaluate to false. * If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the condition evaluates to true. If the value is found, despite the assumption that it does not exist, the condition evaluates to false. Note that the default value for Exists is true . The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException/ exception.

uiTableName :: Lens' UpdateItem Text

The name of the table containing the item to update.

uiKey :: Lens' UpdateItem (HashMap Text AttributeValue)

The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute. 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.

Destructuring the Response

updateItemResponse

Arguments

:: Int

uirsResponseStatus

-> UpdateItemResponse

Creates a value of UpdateItemResponse with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

• uirsItemCollectionMetrics - Undocumented member.
• uirsConsumedCapacity - Undocumented member.
• uirsAttributes - A map of attribute values as they appeared before the UpdateItem operation. This map only appears if ReturnValues was specified as something other than NONE in the request. Each element represents one attribute.
• uirsResponseStatus - -- | The response status code.

data UpdateItemResponse

Represents the output of an UpdateItem operation.

See: updateItemResponse smart constructor.

Instances

Eq UpdateItemResponse

Methods

(==) :: UpdateItemResponse -> UpdateItemResponse -> Bool

(/=) :: UpdateItemResponse -> UpdateItemResponse -> Bool

Data UpdateItemResponse

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UpdateItemResponse -> c UpdateItemResponse

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UpdateItemResponse

toConstr :: UpdateItemResponse -> Constr

dataTypeOf :: UpdateItemResponse -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c UpdateItemResponse)

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UpdateItemResponse)

gmapT :: (forall b. Data b => b -> b) -> UpdateItemResponse -> UpdateItemResponse

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UpdateItemResponse -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UpdateItemResponse -> r

gmapQ :: (forall d. Data d => d -> u) -> UpdateItemResponse -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> UpdateItemResponse -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UpdateItemResponse -> m UpdateItemResponse

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UpdateItemResponse -> m UpdateItemResponse

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UpdateItemResponse -> m UpdateItemResponse

Read UpdateItemResponse

Methods

readsPrec :: Int -> ReadS UpdateItemResponse

readList :: ReadS [UpdateItemResponse]

readPrec :: ReadPrec UpdateItemResponse

readListPrec :: ReadPrec [UpdateItemResponse]

Show UpdateItemResponse

Methods

showsPrec :: Int -> UpdateItemResponse -> ShowS

show :: UpdateItemResponse -> String

showList :: [UpdateItemResponse] -> ShowS

Generic UpdateItemResponse

Associated Types

type Rep UpdateItemResponse :: * -> *

Methods

from :: UpdateItemResponse -> Rep UpdateItemResponse x

to :: Rep UpdateItemResponse x -> UpdateItemResponse

NFData UpdateItemResponse

Methods

rnf :: UpdateItemResponse -> ()

type Rep UpdateItemResponse

type Rep UpdateItemResponse = D1 (MetaData "UpdateItemResponse" "Network.AWS.DynamoDB.UpdateItem" "amazonka-dynamodb-1.4.5-9Gf0U64x7l0KacBmJaIMNw" False) (C1 (MetaCons "UpdateItemResponse'" PrefixI True) ((:*:) ((:*:) (S1 (MetaSel (Just Symbol "_uirsItemCollectionMetrics") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ItemCollectionMetrics))) (S1 (MetaSel (Just Symbol "_uirsConsumedCapacity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ConsumedCapacity)))) ((:*:) (S1 (MetaSel (Just Symbol "_uirsAttributes") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text AttributeValue)))) (S1 (MetaSel (Just Symbol "_uirsResponseStatus") NoSourceUnpackedness SourceStrict DecidedUnpack) (Rec0 Int)))))

Response Lenses

uirsItemCollectionMetrics :: Lens' UpdateItemResponse (Maybe ItemCollectionMetrics)

Undocumented member.

uirsConsumedCapacity :: Lens' UpdateItemResponse (Maybe ConsumedCapacity)

Undocumented member.

uirsAttributes :: Lens' UpdateItemResponse (HashMap Text AttributeValue)

A map of attribute values as they appeared before the UpdateItem operation. This map only appears if ReturnValues was specified as something other than NONE in the request. Each element represents one attribute.

uirsResponseStatus :: Lens' UpdateItemResponse Int

• - | The response status code.