Okay, so I have several tables
Vote
Contest
ContestSegment
ContestRegistration
Submittable
User
The relationship is that a Submittable may be submitted to a contest via creating a ContestRegistration, which is tied to a ContestSegment, which is tied to a Contest.
A Vote has a User and a reference to a ContestRegistration that the Vote relates to.
Pretty simple.
Now, the idea is that I want to hit a RESTful service which checks to see if I've already voted on one of the ContestRegistrations in a contest.
Everything is working except for the desired result.
The JPQL that I'm running looks like this:
SELECT DISTINCT v
FROM Vote v, Contest c
JOIN v.user vu
LEFT JOIN c.segments cs
LEFT JOIN cs.registrations csr
LEFT JOIN csr.votes csrv
WHERE vu.id = :userId
AND cs.beginDate < CURRENT_TIMESTAMP
AND cs.endDate > CURRENT_TIMESTAMP
AND c.id = :contestId
The method looks like:
public Boolean hasUserVoted(User user, Contest contest){
StringBuffer query = new StringBuffer()
.append("SELECT DISTINCT v from Vote v, Contest c ")
.append("JOIN v.user vu LEFT JOIN c.segments cs LEFT JOIN cs.registrations csr LEFT JOIN csr.votes csrv ")
.append("WHERE vu.id = :userId ")
.append(" ")
.append("AND cs.beginDate < CURRENT_TIMESTAMP AND cs.endDate > CURRENT_TIMESTAMP AND c.id = :contestId ");
Boolean hasVoted = true;
try{
Vote vote = (Vote)entityManager.createQuery(query.toString())
.setParameter("userId", user.getId())
.setParameter("contestId", contest.getId()).getSingleResult();
}catch(NoResultException nre){
hasVoted = false;
}
return hasVoted;
}
But when I return, no matter what I plug in, I'm always getting a true back (meaning I've already voted). For instance, I've voted on contest#1, but I haven't voted on contest#2. If I plug in the value for contest#2, then I still get a true back. I'm fairly new to JPQL, so any help you can provide would be awesome! Thanks!
With the use of left joins in your JPQL, it will return true unless the contest don't exists. Its sounds like the csr.votes should be a normal join.
You don't have any restriction linking the vote with the contest. I think your query should be :
SELECT DISTINCT v
FROM Contest c
JOIN c.segments cs
JOIN cs.registrations csr
JOIN csr.votes csrv
JOIN csrv.user vu
WHERE vu.id = :userId
AND cs.beginDate < CURRENT_TIMESTAMP
AND cs.endDate > CURRENT_TIMESTAMP
AND c.id = :contestId
Related
My requirement is to get the list of customers who have ordered an old product.
Here for the old product, we are using an attribute "endproduct".
I am able to get all the customers who have placed orders. BUT I don't know how to create a query to get products from Order Model.
I have run this query :
SELECT distinct {c:uid},{aeo:product} from
{customer as c JOIN order as o on {c:pk}={o:user}JOIN AbstractOrder as ao on {o:pk}={ao:pk} JOIN AbstractOrderEntry as aeo on {ao:pk}={aeo:pk}}
Because AbstractOrderEntryModel has a product attribute.
Try like
SELECT
distinct {u:uid},{p:name}
FROM { Order AS o JOIN OrderEntry AS oe ON {o.pk} = {oe.order} JOIN Product AS p ON {p.pk} = {oe.product} and {p.endproduct} = '1' JOIN User AS u ON {o.user} = {u.pk}}
Change endproduct condition as per your requirement.
Try below query, it should give expected results.
select {c.uid},{p.code}
from {Customer as c}, {Order as o}, {Product as p}, {AbstractOrderEntry as ao}
where {o.user} = {c.pk} and {o.pk} = {ao.order} and {ao.product} = {p.pk}
The following works and results in the output shown in the image below.
SELECT
SU_Internal_ID,
NQ_QuestionText,
NA_AnswerText,
NoOfTimesChoosen
FROM
(SELECT
U.SU_Internal_ID,
NQ.NQ_QuestionText,
NA.NA_AnswerText,
COUNT(PC.UserID) AS NoOfTimesChoosen
FROM [dbo].[ParticipantNSChoices] PC
INNER JOIN [dbo].[KnowledgeSurveyAnswers] NA
on PC.NA_Internal_ID = NA.NA_Internal_ID
INNER JOIN [dbo].[KnowledgeSurveyQuestions] NQ
on PC.NQ_Internal_ID = NQ.NQ_Internal_ID
INNER JOIN [dbo].[AspNetUsers] U
on PC.UserID = U.Id
WHERE
U.SU_Internal_ID=1
and NQ.NQ_QuestionText LIKE '%Do you feel comfortable working with computers%'
GROUP
BY U.SU_Internal_ID,
NQ.NQ_QuestionText,
NA.NA_AnswerText ) as A
I want to add a column to show the percent for the two answers 'No' and 'Yes': so next to 'No' I want '20' and next to 'Yes' '80', but I'm pretty new at this and am stuck; I would appreciate any help. Thanks.
Result of working script
You don't need the outer SELECT.
SELECT
U.SU_Internal_ID,
NQ.NQ_QuestionText,
NA.NA_AnswerText,
COUNT(PC.UserID) AS NoOfTimesChoosen,
(cast(COUNT(PC.UserID) as float) /
cast(
(select count(*) from [dbo].[ParticipantNSChoices] PC2
INNER JOIN [dbo].[KnowledgeSurveyAnswers] NA2 on PC2.NA_Internal_ID = NA2.NA_Internal_ID
INNER JOIN [dbo].[KnowledgeSurveyQuestions] NQ2 on PC2.NQ_Internal_ID = NQ2.NQ_Internal_ID
INNER JOIN [dbo].[AspNetUsers] U2 on PC2.UserID = U2.Id
WHERE
U2.SU_Internal_ID=1
and NQ2.NQ_QuestionText LIKE '%Do you feel comfortable working with computers%' )
as float))
* 100 as PercentChosen
FROM [dbo].[ParticipantNSChoices] PC
INNER JOIN [dbo].[KnowledgeSurveyAnswers] NA
on PC.NA_Internal_ID = NA.NA_Internal_ID
INNER JOIN [dbo].[KnowledgeSurveyQuestions] NQ
on PC.NQ_Internal_ID = NQ.NQ_Internal_ID
INNER JOIN [dbo].[AspNetUsers] U
on PC.UserID = U.Id
WHERE
U.SU_Internal_ID=1
and NQ.NQ_QuestionText LIKE '%Do you feel comfortable working with computers%'
GROUP
BY U.SU_Internal_ID,
NQ.NQ_QuestionText,
NA.NA_AnswerText
The counts will be integers, so you need to cast as floats before dividing. You can then further format to your liking. Also, I might not have your exact denominator, because I don't know what your data looks like, but you can modify to match what you need.
I want to get the list of all Branch even if they have no accounts with user role
Query query = em.createQuery("SELECT NEW com.package.BranchInstructors(b,a) FROM Branch b LEFT JOIN b.accounts a WHERE b.dFlg = 0 AND a.userRole = :role ORDER BY b.name ASC");
query.setParameter("role", "user");
return query.getResultList();
Unfortunately it's returning only Branches with user role, it's like doing INNER JOIN instead.
Any idea what's going on?
just add the a.userRole is null condition to your query to avoid filtering the null userRole that you got from the left join
SELECT NEW com.package.BranchInstructors(b,a)
FROM Branch b
LEFT JOIN b.accounts a
WHERE b.dFlg = 0
AND (a.userRole = :role OR a.userRole IS NULL)
ORDER BY b.name ASC"
The problem is in your WHERE vs LEFT JOIN clause.
If you use LEFT JOIN table Accounts and use this table in the WHERE with AND condition, it behaves like a JOIN.
So, you can use WITH in the LEFT JOIN:
Query query = em.createQuery("SELECT NEW com.package.BranchInstructors(b,a) FROM Branch b
LEFT JOIN b.accounts a WITH a.userRole = :role
WHERE b.dFlg = 0 ORDER BY b.name ASC");
I am running a query with Oracle:
SELECT
c.customer_number,
COUNT(DISTINCT o.ORDER_NUMBER),
COUNT(DISTINCT q.QUOTE_NUMBER)
FROM
Customer c
JOIN Orders o on c.customer_number = o.party_number
JOIN Quote q on c.customer_number = q.account_number
GROUP BY
c.customer_number
This works beautifully and I can get the customer and their order and quote counts.
However, not all customers have orders or quotes but I still want their data. When I use LEFT JOIN I get this error from Oracle:
ORA-24347: Warning of a NULL column in an aggregate function
Seemingly this error is caused by the eventual COUNT(NULL) for customers that are missing orders and/or quotes.
How can I get a COUNT of null values to come out to 0 in this query?
I can do COUNT(DISTINCT NVL(o.ORDER_NUMBER, 0)) but then the counts will come out to 1 if orders/quotes are missing which is no good. Using NVL(o.ORDER_NUMBER, NULL) has the same problem.
Try using inline views:
SELECT
c.customer_number,
o.order_count,
q.quote_count
FROM
customer c,
( SELECT
party_number,
COUNT(DISTINCT order_number) AS order_count
FROM
orders
GROUP BY
party_number
) o,
( SELECT
account_number,
COUNT(DISTINCT quote_number) AS quote_count
FROM
quote
GROUP BY
account_number
) q
WHERE 1=1
AND c.customer_number = o.party_number (+)
AND c.customer_number = q.account_number (+)
;
Sorry, but I'm not working with any databases right now to test this, or to test whatever the ANSI SQL version might be. Just going on memory.
Here is a SQL Query I want to convert to EF4.3
command = database.GetSqlStringCommand(#"
select
H.AUTHENTICATION_ID,
USERNAME,
PERMISSIONS,
ORGANIZATION_IDENTIFIER,
O.ORGANIZATION_ID
from
AUTHENTICATION H
left join [AUTHORIZATION] T on H.AUTHENTICATION_ID=T.AUTHENTICATION_ID
join ORGANIZATION O on O.ORGANIZATION_ID = T.ORGANIZATION_ID
order by H.AUTHENTICATION_ID");
Here is the best LINQ I could come up with:
var query = from h in context.Authentications
join t in context.Authorizations on h.AuthenticationId equals t.Authentications.AuthenticationId
join o in context.Organizations on t.Organizations.OrganizationId equals o.OrganizationId
orderby
h.AuthenticationId
select new
{ AUTHENTICATION_ID = (Int16?)h.AuthenticationId,
h.Username,
t.Permissions,
o.OrganizationIdentifier,
OrganizationID = (Int16?)o.OrganizationId
};
I know i need to merge my first join (between Authorizations & Authentications) into, lets say x and apply DefaultIfEmpty but can't make out the syntax.
EDIT: Image for clarification:
Any help will be highly appreciated. Regards.
The basic syntax for a "left join" in Linq is like this:
from x in table1
join y in table2 on x.id equals y.id into jointable
from z in jointable.DefaultIfEmpty()
select new
{
x.Field1,
x.Field2,
x.Field3,
Field4 = z == null ? 0 : z.Field4
};
In your case, I'm a little confused because the entity relations you seem to be using in your Linq don't match the ones implied by your SQL; are the relationships here zero-or-one, zero-or-many, one-to-one, etc? Specifically, you're doing this:
from h in context.Authentications
join t in context.Authorizations on h.AuthenticationId equals t.Authentications.AuthenticationId
but your SQL implies that "Authentication" is the parent here with zero-or-more "Authorization" children, not the other way around, which would be more like:
from h in context.Authentications
from t in h.Authorizations.DefaultIfEmpty()
If you can give us a better idea of the data model and what data you expect to get out of it we can more easily explain how that query would look in Linq. Assuming that your relationships match what is implied by the SQL, you should be able to get what you want using the following Linq queries:
var query = from h in context.Authentications
from t in h.Authorizations.DefaultIfEmpty()
select new
{
h.AuthenticationId,
h.Username,
Permissions = t == null ? null : t.Permissions,
Organizations = t == null ? new EntitySet<Organization>() : t.Organizations
};
var query2 = from x in query
from o in x.organizations.DefaultIfEmpty()
select new
{
AUTHENTICATION_ID = (short?)x.AuthenticationId,
x.Username,
x.Permissions,
OrganizationIdentifier = o == null ? null : o.OrganizationIdentifier,
OrganizationID = o == null ? (short?)null : o.OrganizationID
};
Given the foreign keys that exist in the question diagram, how about something like this?
var query = from a in context.Authentications
select new
{
a.AuthenticationID,
a.Username,
a.Authorisations.Permissions ?? false,
a.Authorisations.Organisations.OrganisationIdentifier ?? 0
a.Authorisations.Organisations.OrganisationID ?? 0
};
I went ahead and moved the entire query to a Stored Procedure on the database. This solves the problem by avoiding LINQ and ObjectBuilder in the first place.