iReport: Using Variables

问题:

I'm new with iReport and trying the following: I want the report to notice in the detail-band when a special field has another value as it has the entry before. I think that could be possible if I use a variable but I have no idea how to do that. Can someone help me out with an example so I can see the right syntax?

I tried to create a parameter $P{MyField} and fill it with a statement in the "Print when" like this:

($P{MyField}.put("MyField", $F{MyField}) == null  ) ? Boolean.FALSE:Boolean.FALSE

I found that in another Report and wanted to use it...

The parameter was set as

java.util.Map 

with default

new java.util.HashMap()

I think I'm totally wrong... so if someone could help?

回答1:

You can add a rectangle, for example, with a special style, and set the condition at the porperty "print when expression", so the special rectangle would only be printed when it really should be.