|Oracle® OLAP DML Reference
11g Release 1 (11.1)
|PDF · Mobi · ePub|
Within an OLAP DML program, the RETURN command terminates execution of a program prior to its last line. You can optionally specify a value that the program will return when the program is called as a function. The value should have the same data type or dimension that you specified when you defined the program.
The expression to be returned to the calling program when the called program terminates.
The value returned by a program is a single value, without any dimensions. However, within the context of the statement that calls a user-defined function, the function expression has the dimensions of its arguments. In this case, the program is called once for every combination of the dimension values of the function expression.
When you specify a data type when you define a program, the return value will have that data type. When you specify a dimension when you define a program, the return value will be a single value in that dimension. When the expression in a RETURN statement does not match the declared data type or dimension, Oracle OLAP will convert it to the declared data type.
When you do not specify a data type or dimension in the definition of a program, its return value is treated as worksheet data. This means Oracle OLAP will convert any return value to the data type that is required by the calling context. This may lead to unexpected results.
When the program returns values of a dimension, the dimension must be declared in the same analytic workspace as the program. The program will be in the output of the LISTBY program, and OBJ(ISBY) will be
TRUE for the dimension.
When a program has been invoked as a function, but it does not provide a return value, the value that is returned to the calling program is
In this example, suppose you want a report program that will produce a report only when a variable called
newfigures is present in the current analytic workspace. In your program, you can use an IF statement to check whether
newfigures exists and a RETURN to stop execution when it does not.
DEFINE sales.report PROGRAM PROGRAM IF NOT EXISTS('newfigures') THEN DO SHOW 'The new data is not yet available.' RETURN DOEND PUSH month TRAP ON cleanup LIMIT month TO LAST 3 REPORT ACROSS month: newfigures cleanup: POP month END
Now when you run the program without
newfigures in the analytic workspace, the program produces a message and the RETURN statement terminates execution of the program at that point.
The following program derives next year's budget figures from the
actual variable. It is a temporary calculation. You could call this program in a REPORT statement, thus calculating and reporting the budget figures without storing them in an analytic workspace.
DEFINE budget.growth PROGRAM DECIMAL PROGRAM VARIABLE growth DECIMAL VARIABLE factor DECIMAL growth = TOTAL(actual(year 'Yr97') year) - TOTAL(actual(year - 'Yr96') year) factor = ( 1 + growth ) / TOTAL(actual(year 'Yr96') year) RETURN TOTAL(actual(year 'Yr97') year) * (factor * factor/2) END