In my previous blog, you saw that introduction of Decision table in SAP HANA, is a begining of new radical approach to model decision table in database layer and consume in application based on the database. With this foundation, let us start from scratch as I will guide you how to create decision table with simple and easy steps.
Create Decision Table
- Start the HANA Studio
- Open Modeler perspective
- Add HANA system
- Expand HANA System/Content folder
- To create new package, select context menu option New/Package
Figure 9.1 : Create package from context menu
- Give the name of the package as simple-decisiontable
- To create a new decision table,
- Select the package and click New / Decision Table
- Give the name of the decision table as SIMPLE
- Once the decision table is created, an editor opens
Figure 9.2 : Create decision table from context menu
- In the Output panel (on the right), of the editor, select Parameters node
- To create new Parameter, right click and select New…
Figure 9.3 : Create Parameters using context menu in Output panel
- In the Parameters dialog, enter
- Name as QUANTITY
- Data Type as INTEGER
Figure 9.4 : Dialog to create new Parameter
- Repeat the above steps (8,9, and 10) to create two more parameters
- Name as ORDER_AMOUNT, Data type as Decimal (length as 10, Scale as 2)
- Name as DISCOUNT, Data type as Decimal (length as 3, scale as 2)
Model Decision Table
- To do so,
- Add QUANITY and ORDER_AMOUNT as Condition of the decision table
- Select QUANTITY under Parameters node in Output panel
- Right click and select Add as Conditions option
- Repeat the step to add ORDER_AMOUNT as condition
- Add QUANITY and ORDER_AMOUNT as Condition of the decision table
Figure 9.5 : Adding Parameter as Condition of decision table using context menu
- Add DISCOUNT as Action of the decision table
- Select DISCOUNT under Parameters node in Output panel
- Right click and select Add as Actions option
Figure 9.6 : Adding Parameter as Action of decision table using context menu
- Your decision table would finally look like
Figure 9.7 : Decision table overview with Parameters added as Condition and Action
- Manually fill the decision table with values, by using right click options like Add Condition Values etc on the decision table editor
Figure 9.8 : Decision table populated with data
Validate and Activate Decision Table
- Save and Validate the decision table
- To do so, select Save and Validate button on top-right panel of the decision table editor
Figure 9.9 : Validate button to perform validate operation on decision table
- Activate the decision table
- To do so, select Save and Activate button on top right panel of decision table editor
Figure 9.10 : Activate button to perform activate decision table for consumption
Hint: Check Job Log view are success or failure of Validate and Activate operations
Figure 9.11 : Job Log view showing succesful execution of validate and activate action
- Once Activated you can find the decision table runtime object, which is a procedure, at HANA System/Catalog/_SYS_BIC_/Procedures
[ Note: The name of the procedure will be <package-name>/decisiontable-name> i.e. simple-decisiontable/SIMPLE]
Figure 9.12 : Decision table procedure generated after activation
Consume Decision Table
- Open the procedure definition by,
- Option 1 : Double click on the procedure
- Option 2 : Right click on procedure and select Open Definition option
- Note the IN and OUT parameters
Figute 9.13 : Decision table procedure definition
- Open the SQL Editor
- Write the SQL statement to call the decision table procedure
call “_SYS_BIC”.“simple-decisiontable/SIMPLE” (40, 300000, ?)
[ Note that 40 is entered as IN parameter value for QUANTITY, similarly 300000 is entered as IN parameter value for ORDER_AMOUNT, ? in entered for OUT parameter ]
- Execute the SQL statement by selecting the Execute button on top right of the SQL Editor
Figure 9.14: Exeucte button in SQL Editor
- The result could be seen as
Figure 9.15 : Result view after execution of decision table procedure
Analyse Decision Table Execution
Here you see how the evaluation of the decision table happened for input value of QUANTITY and ORDER_AMOUNT to return the value of DISCOUNT as 10
Figure 9.16: Decision table exeuction trace
Having seen how to model decision table and consume the results in your application, you can start using this new capability of business rules management in SAP HANA and let us know of your use cases where we can support you. Me and my team would be happy to help you !
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Thank You. This is Handy!
Helpful INFO, Thanks For Sharing
My first touch on HANA! Thank you for the detailed step-by-step instructions. Great for a newbie like me to follow!
Useful blog .Thanks sharing in detailed steps.
Good one..really you presented it in step by step. Great Job.
Hello Khalid,
Where are you looking for the procedure ?
(1) You must look the procedure in “_SYS_BIC” schema
(2) Refresh the Procedure folder – refresh does not happen automatically if the folder is opened already.
Regards,
Archana
Hello Archana,
Yes I looked in “_SYS_BIC” schema and I refreshed the procedure folder.
When I tried to display the data preview of decision table I get the error message about roles user.
I executed the Grant SQL instruction and now all it’s OK.
Thank you for your help.
Hello Archana,
Nice Document. Step by step articulation is good .
Regards,
Prashanth Maturu
Hi Archana
i have seen the Data foundation Node also while creating the decision Table (HANA SP09).
Seems you have explained only decison Table node.
Hello Manoj,
This blog is targeted for decision tables based on Parameters. There is another blog in the series :Decision Table on HANA Database Tableswhere there is mention of Data Foundation. There are many ways in which you can model the decision table – based on the desired output. This is one of those flavors.