The Appian Documentation below does not explain how to prevent the updating of an existing value. I want to bring in new data, but if the primary key already exists, then I want to retain some of the old data while updating other values.
I tried doing something like:
if(isnull(rule!Query_Existing(pv!data.PrimaryKey)), "new data", "old Data") and save into the field
And the rule above passes the primary key and searches for the "old Data". The rule works by itself, but when I do this if statement, I get a null pointer exception.
Appreciate any help on this.
https://docs.appian.com/suite/help/21.4/Write_to_Data_Store_Entity_Smart_Service.html
Updating an Existing Value
The data that you write can update an existing record when a primary key is properly configured for the entity and provided by your node input.
Saving a new value for an existing record does not merge the records, the old record is overwritten.
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Hello rajo0002 Please follow the below steps in order to update data into the datastore.1. Get old data from from data source using queryEntity() and store it in a variable ( variable data type will be CDT).2. Now update the new data the same variable and perform Write to data store entity.You will have all your new and old updated data.