The PutAttributes operation creates or replaces attributes in an item.
The client may specify new attributes using a combination of the
Attribute.X.Name and Attribute.X.Value parameters. The client
specifies the first attribute by the parameters Attribute.0.Name and
Attribute.0.Value, the second attribute by the parameters
Attribute.1.Name and Attribute.1.Value, and so on.
Attributes are uniquely identified in an item by their name/value
combination. For example, a single item can have the attributes
{ "first_name", "first_value" } and
{ \"first_name\", second_value\" }. However, it cannot have two
attribute instances where both the Attribute.X.Name and
Attribute.X.Value are the same.
Optionally, the requestor can supply the Replace parameter for each
individual attribute. Setting this value to true causes the new
attribute value to replace the existing attribute value(s). For example,
if an item has the attributes { 'a', '1' }, { 'b', '2'} and
{ 'b', '3' } and the requestor calls
put_attributes using the attributes
{ 'b', '4' } with the Replace parameter set to true, the final
attributes of the item are changed to { 'a', '1' } and { 'b', '4' },
which replaces the previous values of the 'b' attribute with the new
value.
Using put_attributes to replace attribute
values that do not exist will not result in an error response.
You cannot specify an empty string as an attribute name.
Because Amazon SimpleDB makes multiple copies of client data and uses an
eventual consistency update model, an immediate
get_attributes or
select operation (read) immediately after a
put_attributes or
delete_attributes operation (write)
might not return the updated data.
The following limitations are enforced for this operation:
256 total attribute name-value pairs per item
One billion attributes per domain
10 GB of total user data storage per domain
simpledb_put_attributes(DomainName, ItemName, Attributes, Expected)An empty list.
[required] The name of the domain in which to perform the operation.
[required] The name of the item.
[required] The list of attributes.
The update condition which, if specified, determines whether the specified attributes will be updated or not. The update condition must be satisfied in order for this request to be processed and the attributes to be updated.
svc$put_attributes(
DomainName = "string",
ItemName = "string",
Attributes = list(
list(
Name = "string",
Value = "string",
Replace = TRUE|FALSE
)
),
Expected = list(
Name = "string",
Value = "string",
Exists = TRUE|FALSE
)
)