Checking if variable is a DataSet in a script

Ignition
1

So I’m not very familiar with Jython and how I can do certain things, hence the probably basic question.

I want to ensure that the parameter being passed to a function is either a Dataset or a PyDataSet, but checking the type of a Dataset returns <type 'com.inductiveautomation.ignition.common.BasicDataset'> and I can’t seem to find a way to actually compare the type of a variable to this. isinstance(dataset, com.inductiveautomation.ignition.common.BasicDataset) just gives an error: “name ‘com’ is not defined”.

Is there something simple I’m missing?

2 
from com.inductiveautomation.ignition.common import BasicDataset
ds = system.dataset.toDataSet(["columnOne", "columnTwo"], [[1, 2]])
print isinstance(ds, BasicDataset)
2 Likes
3

Awesome, thank you!

4

I don’t know what your intentions are, but if you want to accept any dataset type you should compare against com.inductiveautomation.ignition.common.Dataset.

5

Does that include PyDatasets?

I basically just want to do this:

  1. If it’s a PyDataset, pass it along as is to the rest of the function.
  2. If it’s a dataset that can be converted to a PyDataset, convert it first.
6

PyDataSet does implement Dataset, you’ll just need 2 checks.

3 possibilities:

  1. not a Dataset at all
  2. a Dataset, but not a PyDataSet
  3. a PyDataSet
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7

Sorry to keep adding on questions, but how do I check for if it’s a PyDataSet? The type of a PyDataSet appears to be <type 'com.inductiveautomation.ignition.common.script.builtin.DatasetUtilities$PyDataSet'> which raises syntax errors when I try to compare against it because of that $.

8

Hmm. I don’t know offhand… try replacing the “$” with a “.”:

from com.inductiveautomation.ignition.common.script.builtin import DatasetUtilities

isinstance(ds, DatasetUtilities.PyDataSet)
1 Like
9

Seems like that did the trick!

10

I wonder if toPyDataSet should just be smart enough to do no work if passed a PyDataSet and simply return it.

(it’s not, pondering a future change though)

11

It seems to work for me?

pySet = system.dataset.toPyDataSet(ds)
pypyset = system.dataset.toPyDataSet(pySet)

isinstance(pySet, DatasetUtilities.PyDataSet) #=> True
isinstance(pypyset, DatasetUtilities.PyDataSet) #=> True

And I don’t get any errors.

12

Yeah it should work it’s just not as efficient as it could be.

1 Like
13

Alright cool, thanks!

I’ll just check if it’s a Dataset and then run toPyDataset regardless and that’ll be it. Thanks again!

1 Like
14

Hi

Do you have a solution for type BasicStreamingDataset ?

15

Hi,

Do you have the solution for objects (org.python.core.PyUnicode) ?

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