I have an association manyToMany between User and Role entities (User >---< Role)
I wanted to perform this query:
createQuery()
.from(qUser)
.leftJoin(qUser.roles, qRole)
.where(qUser.login.eq(login))
.singleResult(
Projections.bean(User.class,
qUser.id,
qUser.login,
qUser.password,
GroupBy.set(Projections.bean(Role.class,
qRole.id,
qRole.code
)).as(qUser.roles)
)
);
The generated query looks like this, for me it's perfect:
SELECT user0_.ID AS col_0_0_,
user0_.LOGIN AS col_1_0_,
user0_.PASSWORD AS col_2_0_,
role2_.ID AS col_4_0_,
role2_.CODE AS col_5_0_
FROM public.USER user0_
LEFT OUTER JOIN public.USER_ROLE roles1_ ON user0_.ID=roles1_.USER_ID
LEFT OUTER JOIN public.ROLE role2_ ON roles1_.ROLE_ID=role2_.ID
WHERE user0_.LOGIN=? LIMIT ?
But I have a java.lang.IllegalArgumentException: argument type mismatch.
I debugged and I found out that data from database id loaded without problem. This is when QueryDsl/Hibernate did some introspection to create and initialise my entities that the exception is throwed.
The problem is that the User.setRoles(Set<Role>) method has called with a long parameter: The ID of the first Role entity list of the User. Instead of create a Set of Role an then associate these roles to the User.
Is there a problem with the query? Or is it not supported by QueryDsl?
I am using the QueryDsl 3.6.6 (I tested with 3.7.4: same result)
I guess that the java.lang.IllegalArgumentException: argument type mismatch are thrown not by the JOIN comparing and you can verify that by verifing the ID type of the 3 tables UTILISATEUR, ROLE and USER_ROLE.
If there is a difference on type between
UTILISATEUR.ID=USER_ROLE.USER_ID
or
USER_ROLE..ROLE_ID=ROLE.ID
so that's the probleme.
If there is not a problem , the exception is thrown by the test of equality of the login.
But, I suspect that the USER_ROLE join table did not connect with the correct table. You may have two tables USER and UTILISATEUR . Unless you renamed the join table.
I have had same error as you,
I try different ways and it took a lot of time.Eventually I founded this way,
My classes are:
Lesson
LessonScores for saving user scores
LessonScoresModel for returning data and
LessonScoresModel.ScoresModel is a static nested class
I need some information about user scores in a class.
I use below query for returning data.
I use exact related models for retuning data but it's gives the beatiful "argument type mismatch" error.
So I developed a static class for returning data.
JPAQuery query = new JPAQuery(em);
//select from which model you need
query.from(QLessonScores.lessonScores);
//use your condition
query.where(predicate);
//use query and returning data
Map<Lesson,List<LessonScoresModel.ScoresModel>> map = (Map<Lesson,List<LessonScoresModel.ScoresModel>>)
//use tranform for making group by
query.transform(GroupBy.groupBy(QLessonScores.lessonScores.lesson).as(
//return list of data which column we need
GroupBy.list(Projections.fields(LessonScoresModel.ScoresModel.class,
QLessonScores.lessonScores.score.as("score"),
QLessonScores.lessonScores.scoresType.as("scoresType"),
QLessonScores.lessonScores.success.as("success")
))
));
you will find more information in these links,
codata
programcreek
Related
I am working on SQL query, I have pre-created SOQL query, I am looking for a way to convert it to SQL query. The query is:
SELECT CronJobDetail.Name, Id, CreatedDate, State
FROM CronTrigger
WHERE CronjobDetail.JobType = 'bla bla'
AND CronJobDetail.Name LIKE '%bla bla2%'
But It does not run on terminal when I try to create monitoring script in Ruby. The error that I get:
(Got exception: INVALID_FIELD: No such relation 'CronJobDetail' on
entity 'CronTrigger'. If you are attempting to use a custom field, be
sure to append the '__c' after the custom field name. Please reference
your WSDL or the describe call for the appropriate names. in
/Users/gakdugan/.rvm/gems/ruby-1.9.3-p547/gems/restforce-2.2.0/lib/restforce/middleware/raise_error.rb:18:in
`on_complete'
Do you have any idea how can I fix it and make it run on SQL?
You are trying to access a relation without adding it to your FROM clause. Alternatively, if that's a custom field name, then do what the error message suggests you to do (add __c after the custom field name).
You probably want to do something like this:
SELECT CronJobDetail.Name, CronTrigger.Id, CronTrigger.CreatedDate, CronTrigger.State
FROM CronTrigger
INNER JOIN CronJobDetail ON CronJobDetail.id = CronTrigger.foreign_id // this you have to do yourself
WHERE CronjobDetail.JobType = 'bla bla'
AND CronJobDetail.Name LIKE '%bla bla2%'
I've got a few tables, Deployment, Deployment_Report and Workflow. In the event that the deployment is being reviewed they join together so you can see all details in the report. If a revision is going out, the new workflow doesn't exist yet new workflow is going into place so I'd like the values to return null as the revision doesn't exist yet.
Complications aside, this is a sample of the SQL that I'd like to have run:
DECLARE #WorkflowID int
SET #WorkflowID = 399 -- Set to -1 if new
SELECT *
FROM Deployment d
LEFT JOIN Deployment_Report r
ON d.FSJ_Deployment_ID = r.FSJ_Deployment_ID
AND r.Workflow_ID = #WorkflowID
WHERE d.FSJ_Deployment_ID = 339
The above in SQL works great and returns the full record if viewing an active workflow, or the left side of the record with empty fields for revision details which haven't been supplied in the event that a new report is being generated.
Using various samples around S.O. I've produced some Entity to SQL based on a few multiple on statements but I feel like I'm missing something fundamental to make this work:
int Workflow_ID = 399 // or -1 if new, just like the above example
from d in context.Deployments
join r in context.Deployment_Reports.DefaultIfEmpty()
on
new { d.Deployment_ID, Workflow_ID }
equals
new { r.Deployment_ID, r.Workflow_ID }
where d.FSJ_Deployment_ID == fsj_deployment_id
select new
{
...
}
Is the SQL query above possible to create using LINQ to Entities without employing Entity SQL? This is the first time I've needed to create such a join since it's very confusing to look at but in the report it's the only way to do it right since it should only return one record at all times.
The workflow ID is a value passed in to the call to retrieve the data source so in the outgoing query it would be considered a static value (for lack of better terminology on my part)
First of all don't kill yourself on learning the intricacies of EF as there are a LOT of things to learn about it. Unfortunately our deadlines don't like the learning curve!
Here's examples to learn over time:
http://msdn.microsoft.com/en-us/library/bb397895.aspx
In the mean time I've found this very nice workaround using EF for this kind of thing:
var query = "SELECT * Deployment d JOIN Deployment_Report r d.FSJ_Deployment_ID = r.Workflow_ID = #WorkflowID d.FSJ_Deployment_ID = 339"
var parm = new SqlParameter(parameterName="WorkFlowID" value = myvalue);
using (var db = new MyEntities()){
db.Database.SqlQuery<MyReturnType>(query, parm.ToArray());
}
All you have to do is create a model for what you want SQL to return and it will fill in all the values you want. The values you are after are all the fields that are returned by the "Select *"...
There's even a really cool way to get EF to help you. First find the table with the most fields, and get EF to generated the model for you. Then you can write another class that inherits from that class adding in the other fields you want. SQL is able to find all fields added regardless of class hierarchy. It makes your job simple.
Warning, make sure your filed names in the class are exactly the same (case sensitive) as those in the database. The goal is to make a super class model that contains all the fields of all the join activity. SQL just knows how to put them into that resultant class giving you strong typing ability and even more important use-ability with LINQ
You can even use dataannotations in the Super Class Model for displaying other names you prefer to the User, this is a super nice way to keep the table field names but show the user something more user friendly.
I have the following tables, User, Project and Images.
A User has a one to many relationship with Projects and Images. Each Project and Image is owned by a User.
A Project has a many to many relationship with Images. So each Project can have many Images, and an Image can appear within many Projects.
I want to write a DQL query to get all Images, for a specific User that are not included in any Projects. This I can write in SQL.
Is writing in SQL the best way to go?
Or should I be using DQL to do this?
I have tried writing the DQL but its hard work!
Edit
From within my Image Repo I am now doing this
$qb = $this->createQueryBuilder("i");
$qb->select("i")
->from('MyBundleName:User','u')
->innerJoin('u.images', 'user_images')
->where('IDENTITY(u.id) = :user_id')
->andWhere('NOT EXISTS (
SELECT p
FROM MyBundleName:Project p
WHERE user_images MEMBER of p.images
)')
->setParameter('user_id', $user_id);
I have replace the / syntax with : for my classes as they failed when using /
I am still getting this error though;
[Semantical Error] line 0, col 131 near 'id) = :user_id': Error:
Invalid PathExpression. Must be a SingleValuedAssociationField.
The function createQueryBuilder requires an alias, I am passing it "i" - is that right?
I then give it "i" again when calling select?
If I remove the innerJoin then it works, but the results are wrong. It returns all images even if they do exist within an project.
I can't say how difficult it would be in DQL, but I can tell you that in SQL it sounds pretty simple:
SELECT I.*
FROM IMAGES I
INNER JOIN USERS U ON (I.USER_ID = U.USER_ID)
WHERE NOT EXISTS (
SELECT *
FROM PROJECTS P, PROJECT_IMAGES PI
WHERE P.USER_ID = U.USER_ID
AND PI.PROJECT_ID = P.PROJECT_ID
AND I.IMAGE_ID = PI.IMAGE_ID
)
Images owned by a user which does not exist in any project that the user owns.
I don't know what your entities look like but given the relations something like this should work. The key is combining NOT EXISTS and MEMBER OF (you want to make sure that for all returned images no project exists that the image is a member of).
$qb->select("i")
->from('MyBundle\Entity\User','u')
->innerJoin('u.images','i')
->where('IDENTITY(u) = :user_id')
->andWhere('NOT EXISTS (
SELECT p
FROM MyBundle\Entity\Project p
WHERE i MEMBER of p.images
)')
->setParameter('user_id', $user_id);
Having a bit of trouble having not long started with Entity Framework.
I have two tables which have a 0 to 1 relationship. When I select a row from the main table (staff) it's fine unless I select a row that has no joining record in the second table (status). If I do this, then it throws up 'Object reference not set to instance of an object' when it's trying to access the proprty of the second table:
If Not cls.STATUS_DESC.STAFF_INFO Is DBNull.Value Then
lblStatusDescription.Text = cls.STATUS_DESC.STAFF_INFO
End If
The LINQ I use to get the record is:
Dim account As STAFF =
(From a In sa.STAFFs
Where a.STAFF_NO = staffno
Select a).FirstOrDefault
There is no direct reference to the sub table in the statement, however the join is defined in the database diagram which allows me to reference the properties.
I'm certain it's a very basic issue, but like I said I've only just started using it!
I'm not sure if I can interpret your code correctly but I think it has to do with the Lazy Loading feature of Entity Framework. You must explicitly include the reference to load it into memory. You can to this by using the Include() method as below. I assume that STATUS_DESC is the name of the navigation property. Replace it with the actual one if I'm wrong:
Dim account As STAFF =
(From a In sa.STAFFs Where a.STAFF_NO = staffno Select a) _
.Include("STATUS_DESC") _
.FirstOrDefault
Got around it by adding:
If Not cls.STATUS_DESC Is Nothing Then
end if
to the property call, which seems fairly obvious now I think about it. Is this the most efficient way though, I would have thought that EF would have been able to handle a simple left join.
I'm trying to get the maximum value of an integer field in a table. Specifically, I'm trying to automatically increment the "InvoiceNumber" field when adding a new invoice. I don't want this to be an autoincrement field in the database, however, since it's controlled by the user -- I'm just trying to take care of the default case. Right now, I'm using
session.CreateCriteria<Invoice>()
.SetProjection(Projections.Max("InvoiceNumber"))
.FutureValue<int>();
to get the biggest invoice number already in the database. This works great, except when there are no invoices already in the database. Then I get a System.ArgumentException: The value "" is not of type "System.Int32" and cannot be used in this generic collection. Changing to FutureValue<int?>() didn't solve the problem. Is there a way to tell NHibernate to map the empty string to null? Or is there a better way to accomplish my goal altogether?
The stack trace of the exception (at least the relevant part) is
NHibernate.HibernateException: Error executing multi criteria : [SELECT max(this_.[InvoiceNumber]) as y0_ FROM dbo.[tblInvoice] this_;
SELECT this_.ID as ID647_0_, this_.[NHVersion] as column2_647_0_, this_.[Description] as column3_647_0_, this_.[DiscountPercent] as column4_647_0_, this_.[DiscountDateDays] as column5_647_0_, this_.[PaymentDueDateDays] as column6_647_0_, this_.[Notes] as column7_647_0_, this_.[DiscountDateMonths] as column8_647_0_, this_.[PaymentDueDateMonths] as column9_647_0_, this_.[DiscountDatePeriod] as column10_647_0_, this_.[DiscountDateMonthlyDay] as column11_647_0_, this_.[DiscountDateMonthlyDayDay] as column12_647_0_, this_.[DiscountDateMonthlyDayMonth] as column13_647_0_, this_.[DiscountDateMonthlyThe] as column14_647_0_, this_.[DiscountDateMonthlyTheDOW] as column15_647_0_, this_.[DiscountDateMonthlyTheMonth] as column16_647_0_, this_.[DiscountDateMonthlyTheWeek] as column17_647_0_, this_.[PaymentDueDatePeriod] as column18_647_0_, this_.[PaymentDueDateMonthlyDay] as column19_647_0_, this_.[PaymentDueDateMonthlyDayDay] as column20_647_0_, this_.[PaymentDueDateMonthlyDayMonth] as column21_647_0_, this_.[PaymentDueDateMonthlyThe] as column22_647_0_, this_.[PaymentDueDateMonthlyTheDOW] as column23_647_0_, this_.[PaymentDueDateMonthlyTheMonth] as column24_647_0_, this_.[PaymentDueDateMonthlyTheWeek] as column25_647_0_ FROM dbo.[tblTermsCode] this_;
] ---> System.ArgumentException: The value "" is not of type "System.Int32" and cannot be used in this generic collection.
Parameter name: value
at System.ThrowHelper.ThrowWrongValueTypeArgumentException(Object value, Type targetType)
at System.Collections.Generic.List`1.VerifyValueType(Object value)
at System.Collections.Generic.List`1.System.Collections.IList.Add(Object item)
at NHibernate.Impl.MultiCriteriaImpl.GetResultsFromDatabase(IList results)
use....UniqueValue<int?>();
NH uses a non-generic IList in their MultiCriteria implementation. Which is used for FutureValue batching. see here for why List<int?> fails to add null through it's IList implementation. I'm surprised I've never run into this before. Avoid using nullable value types with Future or MultiCriteria.
With the QueryOver API:
Session.QueryOver<T>()
.Select(Projections.Max<Statistic>(s => s.PeriodStart))
.SingleOrDefault<object>();
if nothing is returned its null, otherwise cast the result as numeric