amazonka-dynamodb-0.0.3: Amazon DynamoDB SDK.

Safe HaskellNone
LanguageHaskell2010

Network.AWS.DynamoDB.PutItem

Contents

Description

Creates a new item, or replaces an old item with a new item. If an item that has the same primary key as the new item already exists in the specified table, the new item completely replaces the existing item. You can perform a conditional put operation (add a new item if one with the specified primary key doesn't exist), or replace an existing item if it has certain attribute values.

In addition to putting an item, you can also return the item's attribute values in the same operation, using the ReturnValues parameter.

When you add an item, the primary key attribute(s) are the only required attributes. Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes cannot be empty. Requests with empty values will be rejected with a ValidationException exception.

You can request that PutItem return either a copy of the original item (before the update) or a copy of the updated item (after the update). For more information, see the ReturnValues description below.

For more information about using this API, see Working with Items in the Amazon DynamoDB Developer Guide.

http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutItem.html

Synopsis

Request

Request constructor

Request lenses

piConditionExpression :: Lens' PutItem (Maybe Text) Source

A condition that must be satisfied in order for a conditional PutItem operation to succeed.

An expression can contain any of the following:

Boolean functions: 'ATTRIBUTE_EXIST | CONTAINS | BEGINS_WITH'

Comparison operators: ' = | <> | | | |= | BETWEEN | IN'

Logical operators: 'NOT | AND | OR'

piConditionalOperator :: Lens' PutItem (Maybe ConditionalOperator) Source

There is a newer parameter available. Use ConditionExpression instead. Note that if you use ConditionalOperator and ConditionExpression at the same time, DynamoDB will return a ValidationException exception.

This parameter does not support lists or maps.

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.

piExpected :: Lens' PutItem (HashMap Text ExpectedAttributeValue) Source

There is a newer parameter available. Use ConditionExpression instead. Note that if you use Expected and ConditionExpression at the same time, DynamoDB will return a ValidationException exception.

This parameter does not support lists or maps.

A map of attributecondition pairs. Expected/ provides a conditional block for the PutItem 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 aa is greater than B. For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.

For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values, for example when evaluating query expressions.

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 specified 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 specified 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 specified 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 specified 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 specified 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 specified 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 specified 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 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.

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.

piExpressionAttributeNames :: Lens' PutItem (HashMap Text Text) Source

One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:

To shorten an attribute name that is very long or unwieldy in an expression.

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 expression:

'order.customerInfo.LastName = Smith OR order.customerInfo.LastName =Jones'

Now suppose that you specified the following for ExpressionAttributeNames:

'{"n":"order.customerInfo.LastName"}'

The expression can now be simplified as follows:

'n = Jones'

piExpressionAttributeValues :: Lens' PutItem (HashMap Text AttributeValue) Source

One or more values that can be substituted in an expression.

Use the : character in an expression to dereference an attribute value. For example, consider the following expression:

'ProductStatus IN (Available,Backordered,Discontinued)'

Now suppose that you specified the following for ExpressionAttributeValues:

'{ "a":{S:Available}, "b":{S:Backordered}, "d":{S:Discontinued} }'

The expression can now be simplified as follows:

'ProductStatus IN (:a,:b,:c)'

piItem :: Lens' PutItem (HashMap Text AttributeValue) Source

A map of attribute name/value pairs, one for each attribute. Only the primary key attributes are required; you can optionally provide other attribute name-value pairs for the item.

You must provide all of the attributes for the primary key. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.

If you specify 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.

For more information about primary keys, see Primary Key in the AmazonDynamoDB Developer Guide.

Each element in the Item map is an AttributeValue object.

piReturnItemCollectionMetrics :: Lens' PutItem (Maybe ReturnItemCollectionMetrics) Source

A value that 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.

piReturnValues :: Lens' PutItem (Maybe ReturnValue) Source

Use ReturnValues if you want to get the item attributes as they appeared before they were updated with the PutItem request. For PutItem, 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 PutItem overwrote an attribute name-value pair, then the content of the old item is returned.

piTableName :: Lens' PutItem Text Source

The name of the table to contain the item.

Response

Response constructor

Response lenses

pirAttributes :: Lens' PutItemResponse (HashMap Text AttributeValue) Source

The attribute values as they appeared before the PutItem operation, but only if ReturnValues is specified as ALL_OLD in the request. Each element consists of an attribute name and an attribute value.

pirItemCollectionMetrics :: Lens' PutItemResponse (Maybe ItemCollectionMetrics) Source

Information about item collections, if any, that were affected by the operation. ItemCollectionMetrics is only returned if the request asked for it. If the table does not have any local secondary indexes, this information is not returned in the response.

Each ItemCollectionMetrics element consists of:

ItemCollectionKey - The hash key value of the item collection. This is the same as the hash key of the item.

SizeEstimateRange - An estimate of item collection size, in gigabytes. This value is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on that table. Use this estimate to measure whether a local secondary index is approaching its size limit.

The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.