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How do i a build query at runtime using param


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By: karuppaiah kailasam - karupg

How do i a build query at runtime using param

2004-03-17 22:18

Is there any way of checking the parameters and build a run time query using the parameters

 

for example

 

select * from address is the simple query

 

and i have the following parameters

city_param

name_param

 

select * from address where city = $P{city_param} and name = $P{name_param}

 

here, how do i check if city_param is null or empty value .. and if it is empty i want to ignore the city_param like

 

select * from address where name = $P{name_param}

 

is it possible to do this ?

 

 

By: David Lim - aberrant80

RE: How do i a build query at runtime using p

2004-03-17 23:23

If you want it so complex, why don't you generate the SQL query first, then load the .jasper file, and set the query, before filling the data.

 

 

By: Travis Hoffman - travis_stc

RE: How do i a build query at runtime using p

2004-03-18 10:29

Alternatively, you can just make the parameter encapsulate more of the query:

 

SELECT * FROM address WHERE city = $P!{city_param} $P!{name_param}

 

Of course, that doesn't work well if it's possible that neither are provided. But then, you could do:

 

SELECT * FROM address $P!{where_clause}

 

and simply pass in 'WHERE city = 'foo' AND name = 'bar'' as the where_clause...

 

Hope that helps!

 

-Travis

 

 

By: karuppaiah kailasam - karupg

RE: How do i a build query at runtime using param

2004-03-18 14:51

sorry, i should have mentioned that i need to use the jasper (the compiled jasper designer file) in openreports

 

if i just use jasper (embed with my application) then i can follow the above tips !

 

the problem i have is, openreport loads the jasper file and allows as to pass some parametes if anything required to generate reports using the jasper file, so i don't get chance to check or validate the parameters passed through openreports ..

 

passing the full where class sounds good, but again if i look at from the end-user point of view, the end-user needs some skills/understanding of SQL !!

 

Thanks

karup.

 

 

By: Chuck Deal - cdeal

RE: How do i a build query at runtime using param

2004-03-19 05:57

Perhaps you should investigate Scriptlets or a Custom DataSource

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