Creating parameterized views in oracle11g

Question

I have a big query with nesting and left join and Ineed to create a view out of it so as not to run it from the application. The issue is I need the date range and some other fields as input parameters since it will vary from the front end for each request. I just looked up and saw some posts referring to using SYS_CONTEXT for parameterized views and need to know exactly how do I create the view for example with 2 parameters - fromdate, todate and how I invoke the view from the application.
Just for info I am using grails/groovy for developing the application. and here is the query I want to create view out of..
select
d.dateInRange as dateval,
eventdesc,
nvl(td.dist_ucnt, 0) as dist_ucnt
from (
select
to_date(fromdate,'dd-mon-yyyy') + rownum - 1 as dateInRange
from all_objects
where rownum <= to_date(fromdate,'dd-mon-yyyy') - to_date(todate,'dd-mon-yyyy') + 1
) d
left join (
select
to_char(user_transaction.transdate,'dd-mon-yyyy') as currentdate,
count(distinct(grauser_id)) as dist_ucnt,
eventdesc
from
gratransaction, user_transaction
where gratransaction.id = user_transaction.trans_id and
user_transaction.transdate between to_date(fromdate,'dd-mon-yyyy') and to_date(todate,'dd-mon-yyyy')
group by to_char(user_transaction.transdate, 'dd-mon-yyyy'), eventdesc
) td on td.currentdate = d.dateInRange order by d.dateInRange asc

Answer 1

user12985447 wrote:
I have a big query with nesting and left join and Ineed to create a view out of it so as not to run it from the application. The issue is I need the date range and some other fields as input parameters since it will vary from the front end for each request. I just looked up and saw some posts referring to using SYS_CONTEXT for parameterized views and need to know exactly how do I create the view for example with 2 parameters - fromdate, todate and how I invoke the view from the application.
Just for info I am using grails/groovy for developing the application. and here is the query I want to create view out of..
select
d.dateInRange as dateval,
eventdesc,
nvl(td.dist_ucnt, 0) as dist_ucnt
from (
select
to_date(fromdate,'dd-mon-yyyy') + rownum - 1 as dateInRange
from all_objects
where rownum <= to_date(fromdate,'dd-mon-yyyy') - to_date(todate,'dd-mon-yyyy') + 1
) d
left join (
select
to_char(user_transaction.transdate,'dd-mon-yyyy') as currentdate,
count(distinct(grauser_id)) as dist_ucnt,
eventdesc
from
gratransaction, user_transaction
where gratransaction.id = user_transaction.trans_id and
user_transaction.transdate between to_date(fromdate,'dd-mon-yyyy') and to_date(todate,'dd-mon-yyyy')
group by to_char(user_transaction.transdate, 'dd-mon-yyyy'), eventdesc
) td on td.currentdate = d.dateInRange order by d.dateInRange ascAre you dead set on creating a view? If so ... why?
I'd recommend creating a stored procedure / function (in a package) that returns a ref cursor before i'd recommend what you're going for (unless there is some extremely compelling reason why only a view will work).