how to concat parameters with other values in report query wizard - mysql

Question

I have below query in Report query wizard of iReport
select docid_fname_pemid.*, MONTHNAME(b.ServicePeriodDate) as month_name,YEAR(b.ServicePeriodDate) as year_name , b.NonLTCMaximumSpecialPayment, b.NonLTCEnrolledPatientOutsideUseTotal, b.NonLTCAccessBonus
from (
select docid_pemid.PEMID, docid_pemid.DoctorID, b.$P{transparency_check})
from (
select DoctorID,PEMID from DoctorPEMMap where PEMID in ($P{PEMID_input}) and StartDate >= $P{StartDate} and (EndDate <= $P{EndDate} or EndDate <= '0000-00-00') group by PEMID order by PEMID
)docid_pemid left join Doctors b on docid_pemid.DoctorID=b.DoctorID
) docid_fname_pemid
left join DoctorPayments b on docid_fname_pemid.DoctorID=b.DoctorID
& parameters,as in order (Parameter class, Prompt Yes/NO, Default value Expression)
1)PEMID_input--> string, prompt yes, no
2)month_year--> .String,prompt yes, no
3)transparency_input--> String,prompt yes, no
4)transparency_check -->String,No prompt,($P{transparency_input}=="yes" ) ? ("FirstName") : ("AliasFirstName")
5)StartDate -->String,No prompt, $P{month_year}.split("-")[0]=="April" ? $P{month_year}.split("-")[1].concat("-04-01") : $P{month_year}.split("-")[1].concat("-10-01")
6) EndDate -->String, No prompt, $P{month_year}.split("-")[0]=="April" ? $P{month_year}.split("-")[1].concat("-09-30") : $P{month_year}.split("-")[1].concat("-03-31")
when I run report,give below error
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; 
check the manual that corresponds to your MySQL server version for the right syntax to use near ''FirstName'
from (     select DoctorID,PEMID from DoctorPEMMap where PEMID in ('21' at line 3     
at
I think query not getting 'b.FirstName'. So I used concat function as concat('b.',$P{transparency_check}), but it not works.
I want ultimately b.FirstName or b.AliasFirstName as in mysql query.when any one of this terms I give manually,query runs fine.
How should I go ?

Answer 1

The problem you are having has to do with the way that Jasper inserts parameter values. If you use just $P{PARAMETER NAME}, then I believe it fills in the parameter after compiling the SQL. If you use $P!{PARAMETER NAME}, the parameter is treated as a literal and is filled in before compiling the SQL. This is why Jasper appears to be inserting single quotes around the parameter value when you use $P only.
So try changing this:
b.$P{transparency_check}
To this:
b.$P!{transparency_check}
And remove the extra parenthesis after transparency_check.
Check this link. I think it explains it better than I can.
http://community.jaspersoft.com/wiki/using-report-parameters
Here is what the entire code should look like. I formatted it to make it a little easier for me to read.
SELECT docid_fname_pemid.*,
MONTHNAME(b.ServicePeriodDate) as month_name,
YEAR(b.ServicePeriodDate) as year_name ,
b.NonLTCMaximumSpecialPayment,
b.NonLTCEnrolledPatientOutsideUseTotal,
b.NonLTCAccessBonus
FROM
(
SELECT docid_pemid.PEMID, docid_pemid.DoctorID, b.$P!{transparency_check}
FROM
(
SELECT DoctorID,
PEMID
FROM DoctorPEMMap
WHERE PEMID IN ($P{PEMID_input})
AND StartDate >= $P{StartDate}
AND (EndDate <= $P{EndDate} or EndDate <= '0000-00-00')
GROUP BY PEMID
ORDER BY PEMID
) docid_pemid
left join Doctors b on docid_pemid.DoctorID=b.DoctorID
) docid_fname_pemid
left join DoctorPayments b on docid_fname_pemid.DoctorID=b.DoctorID