Assignment rule

Updates the database by assigning a value that results from evaluating an expression, a fixed value or a value stored in an attribute/variable to an attribute or variable.

Syntax

att | &var = expression [ If condition ]   [ on triggering event];

Where:

att | &var
    Is the attribute or variable to be assigned. In the case of being an attribute, it cannot be a formula.

expression
    Is any valid expression that can involve constants, functions, procedures, variables, or other attributes (the result must match the attribute or variable type definition).

condition
    Is any valid logic condition (that can contain the "and", "or", and "not" logical operators).

triggering event
    Is one of the predefined events available in GeneXus for transaction rules, which allows you to define the precise time for executing a rule.

Scope

Objects: Transaction
Generators:.NET,  .NET Framework, Java, RPG, Cobol, Visual FoxPro (up to GeneXus X Evolution 3), Ruby (up to GeneXus X Evolution 3).

Samples

Consider the following Transaction object:

Customer
{
  CustomerId*      
  CustomerName         
  CustomerAddress      
  CustomerPhone   
  CustomerAddedDate 
  CustomerLastUpdateDate
}  

Now observe the following rules defined in that Transaction to assign values to certain attributes and variables:

CustomerAddedDate = today() if insert;
CustomerLastUpdateDate = today();
&DiscountPercentage=10 if CustomerAddedDate.year() < 2011;

See Also

Assignment command for variables
Assignment command for attributes