It is necessary to summarize the field $F{energy} wit conditions $F{type_energy} like "Active Energy".
I try with this(define Variable Sum) , with conditions in Variable Expression:
$F{type_energy} == ("Active Energy")? $F{energy}: new Double(0)
Boolean.valueOf($F{vrsta_energije}=="Active energy")?$F{iznos_naknade_km}.doubleValue():new Double(0)
new Double($F{vrsta_energije}!= null && $F{vrsta_energije}.equals("Active energy")?$F{kolicina_vrsna_snaga}.doubleValue():0)
IF($F{type_energy} == ("Active Energy"), $F{energy}, null)
where type of fild is:
$F{type_energy} java.lang.String
and $F{energy} java.math.BigDecimal
Keep getting highscore 0.0 or null
change data type of $F{energy} to double in feild expression.
Define a variable sum ($V{Sum}).
keep calculationFunction to none.
Initial value expression as 0.0.
In variable expression have
("Active Energy").equalEgnoreCase( $F{type_energy} ) ? $V{Sum}+$F{energy}: $V{Sum}
Related
Query : if b is credit (i.e 0 or greater than 0), then the values should be a. Otherwise (a+b), and negative values should be zero.
My query condition is
Case when(b>=0) Then (a) Else (SUM(a+b)>0 End as Difference
But I'm getting this error
Error : CASE Types boolean and double precision cannot be matched
It would be a great pleasure if someone assist for the query solution. I'm using Postgres as database.
There is a syntax error in your expression; the number of opening and closing parentheses doesn't match.
But a is a number, while a + b > 0 is a boolean value (“true” or “false”), so PostgreSQL complains that it cannot determine what the type of your case expression should be.
According to your description, I would use
CASE WHEN b >= 0
THEN a
ELSE greatest(a + b, 0)
END
Dart suggest me to use if null operator . Why ? and how to use it?
This is my code:
var name;
name != null ? name : 'nobody';
In other languages we can use the logical-or shortcut. If maybeSomeNumber() returns null, assign a default value of 2:
value = maybeSomeNumber() || 2
In Dart we can't do this because the expression needs to be a boolean (“the operands of the || operator must be assignable to bool”).
That's why the ?? operator exists:
var value = maybeSomeNumber() ?? 2;
Similarly, if we wanted to ensure a value argument was not-null we'd do:
value = value ?? 2;
But there's an even simpler way.
Fallback assignment operator: ??=
value ??= 2;
check the original artical: https://flutterigniter.com/checking-null-aware-operators-dart/
I don't think we need to use conditions or ternary operator here. It will increase program complexity. Try below
name = name || 'nobody';
I have variables in JasperReport 6.60 which is doing some weighted average, and I tried to avoid division by zero by passing it through IF condition but it still producing "Division is undefined"
Let's say I want to show a variable $V{weighted_avg} on a group called ([Group] round), which is consist of two rounds. On the 1st round, $V{divisor} is zero (0), but on the 2nd round $V{divisor} is not zero
The variable $V{weighted_avg} contains expression :
IF($V{divisor}.compareTo(BigDecimal(0.00)) == 1, $V{dividend}.divide($V{divisor}, new MathContext(4)), null)
it will produced error "Division is undefined" on that expression when calculated.
But if I am doing this :
IF($V{divisor}.compareTo(BigDecimal(0.00)) == 1, "> 0", "< 0")
the result is correctly showed.
All variables is Bigdecimal and I expected the $V{weighted_avg} is showing "null" when the $V{divisor} is zero
The builtin IF function evaluates all its arguments, you need to use the Java ternary operator so that only the expression that corresponds to the matching branch gets evaluated.
As in
$V{divisor}.compareTo(BigDecimal(0.00)) == 1 ? $V{dividend}.divide($V{divisor}, new MathContext(4)) : null
My problem is I want Report_Count variable to be null if it increases to 28. so for any value greater than 28 it will become null.
I have written this condition in print when expression property of Report Count variable
($V{REPORT_COUNT} > 28) ? $V{REPORT_COUNT} = null : $V{REPORT_COUNT}
Is it valid or it contains any errors? I don't know why it is not working.....
Any help would be appreciable.....
If you are referring to the built-in REPORT_COUNT variable, as far as I know, you cannot change its value. You could, however, define your own variable, for instance MY_REPORT_COUNT, and print it in your textfield.
For the variable class type - choose for example Integer.
For the variable expression:
$V{REPORT_COUNT}.intValue() > 28 ? null : $V{REPORT_COUNT}
I have two variables in my pre block, and I need a third (a boolean) that identifies whether certain properties hold of those two:
str = "some string from a datasource";
qty = 15; //Also from a datasource
The third variable, valid, needs to be true when str is not empty and qty is greater than 0. How do I do that?
Oh! I just figured it out:
valid = not (str eq "") && (qty > 0);
I had some syntax errors in the rest of my ruleset; that's where the trouble was coming from.