Items

Items represent individual objects within each domain, and each item contains attributes with values. Each item is conceptually similar to a row in a spreadsheet. Items are distinguished by the presence of a unique ID, which can also be used when querying for a specific item.

Note

This unique identifier is not automatically provided by SimpleDB, and is the responsibility of the developer.

A common scheme followed by users of SimpleDB is to generate Globally Unique Identifiers or GUIDs and use them as the key for each item. You are not required to use this scheme and are free to generate this ID anyway you like as long as it is unique. The ID also needs to be unique only within the domain of interest.

Note

The February 24, 2010 announcement added capabilities that aid in doing a counter GUID. The Consistent Read and Conditional Put/Delete capabilities are documented at the end of this chapter.

You can add attributes to an item in SimpleDB. Any items that you create that do not have any attributes...