I am trying to accomplish the following use case on Apache Zeppelin:
When I write an sql query, for example
%sql SELECT * FROM table1 WHERE column1 = ${column1=1,1|2|3|4}
I get a combo box displayed with these values (1,2,3,4) as options.
What I want to do is populate this list with all distinct values available for this column (or as a matter of fact any other set of values which I might want to take from another paragraph in form of a variable). So currently I am stuck at how to use some variables defined in one paragraph inside an sql statement in another paragraph ?
Diving into the code, I saw that inside the Zeppelin-interpreter, a file called Input.java checks for a pattern ${someColumn=someValues}, fills up the combo-box options and then creates a simple query, and hence I have dropped the idea of populating it by running a query in the same paragraph.
I'm using a Scala variable from one paragraph to Shell Script in another paragraph. Here's the answer.
In Scala Cell
%spark2
val myVal = "test-value-across-paragraphs"
z.put("objName", myVal)
In Shell Cell
%sh
echo {objName}
This requires object interpolation to be enabled which can be done by setting the value of the property zeppelin.shell.interpolation to true. Check Apache Zeppelin for further help.
Update May 19, 2019
The above procedure may not work in Zeppelin 2.2 but obviously works in Zeppelin 2.3. Also in 2.3, the value of interpolation can be changed from the sh.config cell.
%sh.conf
zeppelin.shell.interpolation true
You can use ZeppelinContext to accomplish this, as it enables you to use put() and get() to set and retrieve objects between paragraphs.
Quoting the example from the linked page, note that the z object is the default instance of ZeppelinContext:
// Put object from scala
%spark
val myObject = ...
z.put("objName", myObject)
# Get object from python
%spark.pyspark
myObject = z.get("objName")
Related
I am doing a simulation of a production line, which is built through Excel.
Now there is one, which needs free setting of worker shifts for each machine, three shifts in total.
My idea is to create three different Schedules, representing each of the three shifts, and then in the ResourcePool, use the If statement to set up the use of each shift. As shown in the picture enter image description here
But it didn't work. If it is possable, Could you please tell me if there is something wrong with the Java statement or the idea is wrong.
If possible, could you please tell me how to set multiple schedules in ResourcePool?
Additions to the question：
The model is to do the evaluation of the production system and the shift of the workers is an important evaluation parameter. What I want to do is to enter the shift of the workers directly in the Excel sheet and ResourcePool recognizes and uses the corresponding Schedule.
I tried to generate the corresponding Schedule by code, but the Schedule of Resourcepool cannot be set dynamically. So I would like to try to manually input multiple Schedules into the model and then set the corresponding Schedule in ResourcePool by If statement like the image.
Thanks in advance
The first thing you need to know is that the location where you placed the code is a static parameter, thus it is only evaluated once, when the object is created and not checked continuously.
This is indicated by the little popup when you hover over the button that change the entry field from code to value
If it was dynamic it would state Dynamic Value instead of Static Value
Secondly, inside that field you must use a ternary operator, not an if statement, so that the result of the formula is a scheduled object, else you will get a "misplaced construct(s)" error
If you changed the code to
v_Shift == "Shift1" ?
s_Shift1 : v_Shift == "Shift2" ? s_Shift2 : s_Shift3
It will work BUT:
It will only be evaluated when the object is created and not again
Rather not use == on Strings, always use .equals(), on Strings it might work, and sometimes it might not. You can do some research as to why ;-)
Solution: You will have to use a function to change the schedule of the resource pool. Call this function whenever the v_Shift variable changes
As far as I understand, it is not possible in Appian to dynamically construct (process) variable names, just like you would do e.g. with bash using backticks like MY_OBJECT=pv!MY_CONS_`extract(valueOfPulldown)`. Is that correct? Is there a workaround?
I have set of Appian constants, let's call them MY_CONS_FOO, MY_CONS_BAR, MY_CONS_LALA, all of which are e.g. refering to an Appian data store entity. I would like to write an Appian expression rule which populates another variable MY_OBJECT of the same type (here: data store entity), depending e.g. of the options of a pull-down menu having the possible options stored in an array MY_CONS_OPTIONS looking as follows
FOO
BAR
LALA
I could of course build a lengthy case-structure which I have to maintain in addition to MY_CONS_OPTIONS, so I am searching for a more dynanmic approach using the extract() function depending on valueOfPulldown as the chosen value of the pulldown-menu.
Edit: Here the expression-rule (in pseudo-code) I want to avoid:
if (valueOfPulldown = 'FOO') then MY_OBJECT=pv!MY_CONS_FOO
if (valueOfPulldown = 'BAR') then MY_OBJECT=pv!MY_CONS_BAR
if (valueOfPulldown = 'LALA') then MY_OBJECT=pv!MY_CONS_LALA
The goal is to be able to change the data store entity via pulldown-menu.
This can help you find what is behind your constant.
fn!typeName(fn!typeOf(cons!YOUR_CONSTANT)).
Having in mind additional details I would do as follows:
Create separate expression that will combine details into list of Dictionary like below:
Expression results (er):
{
{dd_label: "label1", dd_value: 1, cons: "cons!YOUR_CONSTANT1" }
,{dd_label: "label2", dd_value: 2, cons: "cons!YOUR_CONSTANT2" }
}
on UI for your dropdown control use er.dd_label as choiceLabels and er.dd_value as choiceValues
when user selects value on Dropdown save dropdown value to some local variable and then use it to find your const by doing:
property( index(er, wherecontains(local!dropdownselectedvalue, tointeger(er.dd_value))), "cons")
returned value of step 3 is your constant
This might not be perfect as you still have to maintain your dictionary but you can avoid long if...else statements.
As a alternative have a look on Decisions Tables in Appian https://docs.appian.com/suite/help/21.1/Appian_Decisions.html
Context
I have a interface in VB.NET that extract the data from the UniVerse using UniObjects for .NET
Problem
From the COB file I need to get all keys where the FEC.COB field is equal to a specific date and the field SEC is equal to 04.
An expert in UniVerse Database told me that I can run the follow queries:
SELECT COB WITH FEC.COB > “31/10/2013”
SELECT.ID 1 2 04
But I don't know how can I do that with UniObjects library. Can anyone help me?
I don't use UniObjects as my shop normally gets data our of UniVerse via ODBC. Also my VB is bad, so I don't have much metacode for you, but the basic idea would be to do something like this.
1.) Create a UV Session. Hopefully you have that much worked out as I can be of next to no help there.
2.) Once the session is established Execute your query by doing something like this
session.Command.Text = "SELECT COB WITH FEC.COB > '31/10/2013'"
session.Command.Exec
(I converted your double quotes to single quotes and Universe won't mind).
3.) If you just need the IDs, you can get them by iterating through the select list that your query returns. A command line query will always return to list 0 unless you specify otherwise in your UV query. In most cases your results will be in session.SelectList(0)
Dim objSelect As object
Set objSelect = objSession.SelectList(0)
4.) It looks like the SelectList object has a ReadList method which returns a Dynamic Array Object, which you should be able to iterate through using normal array looping. Additionally you can use a while loop and next to do what you need to do.
Dim someObject as Object
someObject = objSelect.Next ' Get first ID
Do While Not objSelect.LastRecordRead
' Do something here with someObject. Maybe ToString it or something
someObject = objSelect.Next' Get next ID
Loop
Hope that is somewhat helpful.
I have the following selection parameter:
PARAMETERS: p_ver(2) AS LISTBOX VISIBLE LENGTH 5.
I would like to populate it with the results from a ZECONFIG_VAR table.
At what point would I do this. Selection Screen Output, Start of Selection, or other. I am trying to allow users the ability to decide what version of the web service they would like to call. The config table will have different url's for the different versions.
I have looked at this Answer and the tutorial provided does not make sense to me.
I would do it at the event INITIALIZATION
However, it may be even easier to just create a search-help, and assign it to p_ver using the following:
parameters: p_ver(2) visible lenghth 5 MATCHCODE OBJECT zshelpname.
Esti is right that you probably want to fill an internal table from the DB table during INITIALIZATION.
But to the populate the listbox parameter, you need to put the call to VRM_SET_VALUES in AT SELECTION-SCREEN OUTPUT.
In kettle what is output field in java script and how to use setVariable in it.I tried to set variable in it but it gave me error
The javascript step takes the input from the previous steps and can be accessed from the input field. If you want to pass the same field to the output, you need to us the output field.
Also if you want to set the variable in javascript step, you can use
setVariable("variablename","value","type");
they are two different things.
the javascript if connected in a stream , gets as input all the fields (columns)
and can manipulate them with regular javascript.
if you want a new variable that will be a part of the stream all you need to do is:
var X;
then you can write this X as output at the bottom of the step.
give it a name and use it
so if you use something like
x = fieldA + fieldB
you can use the x on the stream.
the set variables used for setting a variable in one job to use in another job
its more like global / public in programming.
if you want to learn more about it you can take my course
just click pentaho kettle tutorial there is a lesson (video) on both steps