Sequence

A Sequence defines a list of unique values.

The curValue and nextValue functions are used to get the current and next values in the sequence.

The following fields are configured in the Basic Settings:

Field	Description
Name	The name of the sequence.
Start Value	The first value in the sequence.
Block Size	To configure the sequence to generate values without any gaps in the sequence, at the expense of increased database load, set the block size to 1. To improve performance, and allow gaps in the sequence of values, set the block size to a value greater than 1.
Current Value	(Readonly) The highest value already allocated.

The form provides the standard form icons.

Example: Using a Sequence

To set a stream attribute to a unique order ID:

nextValue('order_id')

Every time a new record is generated in this stream, nextValue will return a new unique value.