Network.AWS.SDB.Select

The Select operation returns a set of attributes for ItemNames that match the select expression. Select is similar to the standard SQL SELECT statement.

The total size of the response cannot exceed 1 MB in total size. Amazon SimpleDB automatically adjusts the number of items returned per page to enforce this limit. For example, if the client asks to retrieve 2500 items, but each individual item is 10 kB in size, the system returns 100 items and an appropriate NextToken so the client can access the next page of results.

For information on how to construct select expressions, see Using Select to Create Amazon SimpleDB Queries in the Developer Guide.

See: AWS API Reference for Select.

This operation returns paginated results.

Creating a Request

select

Arguments

:: Text

sSelectExpression

-> Select

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

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

• sConsistentRead
• sNextToken
• sSelectExpression

data Select

See: select smart constructor.

Instances

Eq Select

Data Select

Read Select

Show Select

Generic Select

AWSPager Select

AWSRequest Select

ToPath Select

ToHeaders Select

ToQuery Select

type Rep Select

type Rs Select = SelectResponse

Request Lenses

sConsistentRead :: Lens' Select (Maybe Bool)

Determines whether or not strong consistency should be enforced when data is read from SimpleDB. If true, any data previously written to SimpleDB will be returned. Otherwise, results will be consistent eventually, and the client may not see data that was written immediately before your read.

sNextToken :: Lens' Select (Maybe Text)

A string informing Amazon SimpleDB where to start the next list of ItemNames.

sSelectExpression :: Lens' Select Text

The expression used to query the domain.

Destructuring the Response

selectResponse

Arguments

:: Int

srsResponseStatus

-> SelectResponse

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

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

• srsItems
• srsNextToken
• srsResponseStatus

data SelectResponse

See: selectResponse smart constructor.

Instances

Eq SelectResponse

Data SelectResponse

Read SelectResponse

Show SelectResponse

Generic SelectResponse

type Rep SelectResponse

Response Lenses

srsItems :: Lens' SelectResponse [Item]

A list of items that match the select expression.

srsNextToken :: Lens' SelectResponse (Maybe Text)

An opaque token indicating that more items than MaxNumberOfItems were matched, the response size exceeded 1 megabyte, or the execution time exceeded 5 seconds.

srsResponseStatus :: Lens' SelectResponse Int

The response status code.