Sequence Functions
Sequence functions are function to work with sequences in CTL.
To use sequence functions you need a sequence in a graph. See Chapter 35, Sequences.
Sequences are accessed via sequence() function:
specify the name of the sequence as an argument of the function.
There are three actions that can be performed on the sequence. You can get the current number of the sequence, or get the next number of the sequence, or you may want to reset the sequence numbers to the initial number value.
![[Warning]](figures/warning.png) | Warning |
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Remember that you should not use the functions shown below
in the |
See the following options:
sequence(<sequence name>).current()
sequence(<sequence name>).next()
sequence(<sequence name>).reset()
Although these expressions return integer values, you may also want to get long or string values. This can be done in one of the following ways:
sequence(<sequence name>,long).current()
sequence(<sequence name>,long).next()
sequence(<sequence name>,string).current()
sequence(<sequence name>,string).next()
The name of the functions are self-descriptive, but there are some details useful to know:
Sequence Important Details
Do not use current() before first call of next().
The first call of next() resets the sequence to its initial value.
See the example below.
There is a sequence seq01 with 10 as initial value and step set to 1.
sequence(seq01).current(); // returns 10 sequence(seq01).next(); // returns 10 sequence(seq01).current(); // returns 10 sequence(seq01).next(); // returns 11 sequence(seq01).current(); // returns 11 sequence(seq01).next(); // returns 12
Do not use sequence functions in init(),
preExecute() and postExecute() functions of CTL template.