banania Posted June 29, 2011 Share Posted June 29, 2011 Hello guys,Well, almost all is said in the title.I currently have a strange behavior working with iReport ( / jasper reports) 4.0.2. : for some fiels and variables, i try to replace null values with fixed values (most of the time "0"). To do this simple thing, i use a small piece of code in the variable expression :($F{MyField} == null) ? new Double("0") : $F{MyField}But i still get null values in the report. Before getting completely nuts, i made a new test with a new boolean variable :$F{MyField} == nulland, surprise, it returns null. Ok now I understand why this is not working for my variables... but why is this condition not giving true when myField is null ? By the way, "Replace null by blank" option is working, but is not sufficient for my report. Does anyone have an idea ? RegardsBanania Link to comment Share on other sites More sharing options...
banania Posted July 1, 2011 Author Share Posted July 1, 2011 Hello,Nobody has a clue ?Can it be some kink of bug ? Do I make something definitivly wrong ? RegardsBanania Link to comment Share on other sites More sharing options...
adig Posted July 5, 2011 Share Posted July 5, 2011 Are you sure it is not "null" string value as compared to null? Tick the 'Blank when null' option in ireports to see if that works. Link to comment Share on other sites More sharing options...
banania Posted July 5, 2011 Author Share Posted July 5, 2011 Thanks for your answer. Yes good point, but checked the database and it's really a NULL value. If I check "blank on null" value is blanked. I made a really simple report just to reproduce problem. See below.Variable "variable1" just check if MT_LIB field is null. It prints 'false' is field is not null... but it print "null" instead of "true" if field is null.I'm losing my last hairs... <?xml version="1.0" encoding="UTF-8"?><jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20"> <property name="ireport.zoom" value="1.0"/> <property name="ireport.x" value="0"/> <property name="ireport.y" value="0"/> <queryString> <![CDATA[sELECT CO_NUMCO, LI_MTLIBFROM table1WHERE field1 = 69906]]> </queryString> <field name="CO_NUMCO" class="java.lang.Integer"/> <field name="LI_MTLIB" class="java.lang.Double"/> <variable name="variable1" class="java.lang.String"> <variableExpression><![CDATA[$F{LI_MTLIB}==null]]></variableExpression> </variable> <background> <band splitType="Stretch"/> </background> <title> <band height="79" splitType="Stretch"/> </title> <pageHeader> <band height="35" splitType="Stretch"/> </pageHeader> <columnHeader> <band height="24" splitType="Stretch"> <staticText> <reportElement x="36" y="2" width="100" height="20"/> <textElement/> <text><![CDATA[CO_NUMCO]]></text> </staticText> <staticText> <reportElement x="189" y="2" width="100" height="20"/> <textElement/> <text><![CDATA[LI_MTLIB]]></text> </staticText> </band> </columnHeader> <detail> <band height="23" splitType="Stretch"> <textField> <reportElement x="19" y="0" width="100" height="20"/> <textElement/> <textFieldExpression class="java.lang.Integer"><![CDATA[$F{CO_NUMCO}]]></textFieldExpression> </textField> <textField> <reportElement x="150" y="0" width="100" height="20"/> <textElement/> <textFieldExpression class="java.lang.Double"><![CDATA[$F{LI_MTLIB}]]></textFieldExpression> </textField> <textField> <reportElement x="289" y="0" width="100" height="20"/> <textElement/> <textFieldExpression class="java.lang.String"><![CDATA[$V{variable1}]]></textFieldExpression> </textField> </band> </detail> <columnFooter> <band height="45" splitType="Stretch"/> </columnFooter> <pageFooter> <band height="54" splitType="Stretch"/> </pageFooter> <summary> <band height="42" splitType="Stretch"/> </summary></jasperReport> Link to comment Share on other sites More sharing options...
anilkumarpoddar Posted July 11, 2011 Share Posted July 11, 2011 Dear Bana.. As per my understanding, you have a field where there is some data on database and another consist of null value.and you want to print '0' in place of null .....if i m on right path then solution is here...............!you already had a field associated with database field....now you drawn on static label exactly above the field where you want to print '0' in case value is null then make it hide by uncheck on opaque so that it should not display normally.....!....now use print when expression properties of jasper on that field and put condition like new Boolean(field name(having value from database =="" or having value from database==null) and on acutal field use print on expression with condition new Boolean(field name having value from database!=null)Hope this will work!...... Link to comment Share on other sites More sharing options...
jmurray Posted July 12, 2011 Share Posted July 12, 2011 This won't address the underlying issue with your report design but will give you the results you want: force the database to always return a value in that field.eg. SELECT field1, field2, nvl(problemfield,0) as problemfield FROM table.....Note: The equivalent to Oracle's nvl() in MySQL is ifnull(), in postgres and db2 it's coalesce(), in MS-SQL it's isnull() Link to comment Share on other sites More sharing options...
stevep0000 Posted November 17, 2011 Share Posted November 17, 2011 Hi,One point, are you using "Groovy" for the Report Language ?If so, try changing it to "Java".I have had similar problems trying to handle null Integer parameters; in Groovy, you can just say$F(field1) ? $F(field1) : "Default Value"If something is null its effectively FALSE.However, I have only manage to get this to work with Strings.Steve Link to comment Share on other sites More sharing options...
ganapathy_1 Posted February 9, 2013 Share Posted February 9, 2013 I have wriiten this code. ($F{FirstColorName}=="NONE") ? "" : $F{FirstColorName} The output of this code is None, noun, etc, and that first color name. Now i want to Show the coloumn will be blank instead of that none. Help me.. Link to comment Share on other sites More sharing options...
l_claudia90 Posted August 14, 2014 Share Posted August 14, 2014 It's 3 years later and I'm sure the original poster does not remember the solution, but I'm having the exact same problem.I have a variable that has the result of a scriplet method which returns "null". It's not a string, and it doesn't seem like an object eitherbecause I can't compare it to anything.. It is just null, plain and simple.How do I get around this problem? I need to know if it is null to be able to "ignore" it's value.This is what I wanted:($V{IMAGE_PATH} != null ) ? $V{IMAGE_PATH} : "" Would greatly appreciate some input =)Cheers from Spain! Link to comment Share on other sites More sharing options...
l_claudia90 Posted August 18, 2014 Share Posted August 18, 2014 Well, since I didn't get a reply, I did a workaround especific to my own code that didn't evaluate the null expression. Thanks anyway! Link to comment Share on other sites More sharing options...
jsuarezc1 Posted August 5, 2018 Share Posted August 5, 2018 Hi What I did is the following: In the sql statement I'm working with postgres check syntax to another database. I added : select field1,field2, case when (contract.date_end IS NULL) THEN 0 ELSE 1 END as check,So I have a field called checkAnd I used in an expression as an IF$F{check}==0 ? " A text according to the definition" : " to " + $F{fechaf}.toString()I hope this will help someone. The other solution could be create a class and added to the report as a jar file. Link to comment Share on other sites More sharing options...
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