I need to search all the usernames and for the application to print out all the usernames containting the search string. I think I have done this but when I execute searchByString(), I just get no results.
AbstractFacade
/* trying out a search function */
public List<T> searchByString(String string) {
System.out.println("in SearchByString");
return getEntityManager().createNamedQuery("Userdetails.findByUsername").setParameter("username", "%" + string + "%").getResultList();
}
Userdetails.java this is where the query is done
#Entity
#Table(name = "USERDETAILS")
#XmlRootElement
#NamedQueries({
#NamedQuery(name = "Userdetails.findAll", query = "SELECT u FROM Userdetails u"),
#NamedQuery(name = "Userdetails.findById", query = "SELECT u FROM Userdetails u WHERE u.id = :id"),
#NamedQuery(name = "Userdetails.findByUsername", query = "SELECT u FROM Userdetails u WHERE u.username = :username")})
I can not get a filled list. I am wondering if the query is running right and retriving anything, so I want to be able to see what it retrieves when it is run, so I can look at why nothing gets displayed to the user.
Your query parameter looks like you want a like clause, but your named query uses =. Change
SELECT u FROM Userdetails u WHERE u.username = :username
to
SELECT u FROM Userdetails u WHERE u.username like :username
and it should work.
Related
I am currently trying to find out what the best pagination option is with EclipseLink and SQL Server.
I saw that for SQL Server there is no special support for pagination with EclipseLink. If I have the following data model, findAll creates a set of select (n + 1) for each subentity. That doesn't look efficient at first.
public class Foo {
#OneToMany( fetch = FetchType.LAZY )
private Set<Bar> bars = Sets.newHashSet();
}
public class Bar {
#OneToMany( fetch = FetchType.LAZY )
private Set<FooBar> fooBars = Sets.newHashSet();
}
public class FooBar {
String name;
}
So for every bar and fooBar there is a separate select.
Now I would like to discuss a few solutions. My current suggestions are. If a good possibility has been found, I can see how it is best implemented in spring data.
Chunking using Ids with IN
Query query = em.createQuery("SELECT f.id FROM Foo f ORDER BY f.id OFFSET 10 ROWS FETCH NEXT
10 ROWS ONLY");
List<Integer> ids = query.getResultList();
Query query = em.createQuery("SELECT DISTINCT f FROM foo f"
+ " LEFT JOIN FETCH f.bar bars "
+ " LEFT JOIN FETCH bar.fooBars foobars "
+ " WHERE t.id in (:ids) " )
query.setParameter("ids", ids.subList(5, 10));
List<Foo> foos = query.getResultList();
Using IN statement for every subselect (like hibernate) instead of single select
Using Batch with QueryHints IN or JOIN?
https://www.eclipse.org/eclipselink/documentation/2.5/jpa/extensions/q_batch.htm
Another possibility?
I am facing an error mentioned above, while fetching a list of values in a named query.
Here is the HQL syntax for this:
select rolepermis0_.permission_name as col_0_0_ from role_permission rolepermis0_ where rolepermis0_.role_id in ()
and here is the named query syntax i am using:
#NamedQuery(name = "rolePermission.getPermissionsByRoleIds",
//query = "SELECT NEW com.bitwise.tdm.project.internal.entity.Project(p.projectId, p.projectName,p.projectDescription) FROM UserProjectEntity up LEFT JOIN up.user u LEFT JOIN up.project p WHERE up.userId = :userId")
query = "SELECT rp.permissionName FROM RolePermissionEntity rp WHERE rp.roleId IN (:roleIds)")
Can someone please point out what am i missing in this?
I have some tables like "Job" "AppliedJob" "JobOffer" "Contract" "Employeer"
Description: When employeer post job it is stored in "Job" table with his ID. If a freelancer apply to the job it is stored in "AppliedJob" table with his ID. Then Employeer sees the application and send offer to the freelancer and it is stored in "JobOffer" table. If freelancer accept the offer it is then stored in "Contract" table. At first in "Contract" ContractID, OfferID and StratDate are stored and CompletedDate is stored as null. When the contract is completed the CompletedDate field is modified with date.
Want: I want to return all jobs with no completed contract
I tried:
[HttpGet]
[Route("api/PrivateApi/GetEmployeerPostedJob/")]
public object GetEmployeerPostedJob(int id)
{
var data = (from j in db.Jobs
where j.EmployeerID == id
join apl in db.AppliedJobs
on j.JobID equals apl.JobID
join o in db.JobOffers
on apl.AppliedJobID equals o.AppliedJobID
join con in db.Contracts
on o.OfferID equals con.OfferID
where con.CompletedDate == null
select new
{
j.JobTitle,
j.JobID,
j.Budget,
j.Deadline,
j.Employeer,
j.JobDetails,
j.PublishDate,
j.ReqSkill,
j.NoOFFreelancer,
j.Preference,
Category1=j.Category,
totalAppliedFreelancer=(from aple in db.AppliedJobs where j.JobID ==aple.JobID select aple).Count(),
Category = (from gg in db.Categories where gg.CategoryID == j.Category select gg.CategoryName).FirstOrDefault()
}).ToList();
return data.AsEnumerable();
}
But it returns no jobs.
How can i get all jobs which are not completed yet(CompletedDate == null in Contract table)?
I want to show the employeer's posted jobs on his page but only those jobs that are not completed
The above (die to one to many relationships involved) can be paraphrased as
return all jobs with no completed contract
while the way you wrote the query, besides the possible data duplication, it answers the question
return all jobs with existing, but not completed contract
i.e. is missing the jobs w/o applied job, applied job w/o offer and offer w/o contract.
The correct query would be something like this:
from job in db.Jobs
where job.EmployeerID == id
join jobContract in (
from appliedJob in db.AppliedJobs
join offer in db.JobOffers on appliedJob.AppliedJobID equals offer.AppliedJobID
join contract in db.Contracts on offer.OfferID equals contract.OfferID
select new { appliedJob, offer, contract }
) on job.JobID equals jobContract.appliedJob.JobID into jobContracts
where !jobContracts.Any(jobContract => jobContract.contract.CompletedDate != null)
select ...
The query could further be simplified by using navigation properties, but since I don't see navigation properties between AppliedJob and JobOffer, I'm leaving that for you.
Update: Here is the same query with navigation properties (by simplified I meant no need for join operators):
from job in db.Jobs
let completedContracts =
from appliedJob in job.AppliedJobs
from offer in appliedJob.JobOffers
from contract in offer.Contracts
where contract.CompletedDate != null
select contract
where !completedContracts.Any()
select ...
This LINQ query doesn't work on live server (sql-2008) But works on my local VS 2013. Is there any mistake if my live database is empty at first time?
#Ivan Stoev
public object BrowseJobs()
{
var skills = db.Skills.ToDictionary(d => d.SkillID, n => n.SkillName);
var jobData = (from j in db.Jobs where j.Preference==2
//from cj in j.ClosedJobs.DefaultIfEmpty()
join cj in db.ClosedJobs.DefaultIfEmpty()
on j.JobID equals cj.JobID into closedJob
where !closedJob.Any()
join c in db.Categories on j.Category equals c.CategoryID
join jobContract in
(
from appliedJob in db.AppliedJobs.DefaultIfEmpty()
from offer in appliedJob.JobOffers.DefaultIfEmpty()
from contract in db.Contracts.DefaultIfEmpty()
select new { appliedJob, offer, contract }
).DefaultIfEmpty()
on j.JobID equals jobContract.appliedJob.JobID into jobContracts
where !jobContracts.Any(jobContract => jobContract.contract.CompletedDate != null)
select new
{
JobTitle = j.JobTitle,
JobID = j.JobID,
ReqSkillCommaSeperated = j.ReqSkill,
Category = c.CategoryName,
Budget=j.Budget,
Deadline=j.Deadline,
JobDetails=j.JobDetails,
PublishDate=j.PublishDate,
TotalApplied=(from ap in db.AppliedJobs where j.JobID == ap.JobID select ap.AppliedJobID).DefaultIfEmpty().Count()
}).AsEnumerable()
.Select(x => new
{
JobID = x.JobID,
JobTitle = x.JobTitle,
Category = x.Category,
Budget = x.Budget,
Deadline = x.Deadline,
JobDetails = x.JobDetails,
PublishDate = x.PublishDate,
SkillNames = GetSkillName(x.ReqSkillCommaSeperated, skills),
TotalApplied = (from ap in db.AppliedJobs where x.JobID == ap.JobID select ap.AppliedJobID).DefaultIfEmpty().Count()
}).ToList();
return jobData.AsEnumerable();
}
I have this raw sql that I am trying to run on grails
final session = sessionFactory.currentSession;
final String query = 'select count(A.*) from Artifact as A LEFT JOIN classification as C on (A.id=C.artifact_id) where C.id IS NULL OR C.active=0';
final sqlQuery = session.createSQLQuery(query);
def totalunclass = sqlQuery.with {
addEntity(Artifact);
}
But I am getting the error Message: SQL queries do not currently support returning aliases
I tried another method but failed there too achieve the result click here
Try changing your query line to look like this
final String query = 'select count(*) from Artifact A LEFT JOIN classification C on (A.id=C.artifact_id) where C.id IS NULL OR C.active=0';
Try this and remove aliases:
final session = sessionFactory.currentSession;
final String query = 'select count(Artifact.*) from Artifact LEFT JOIN classification on (Artifact.id=classification.artifact_id) where classification.id IS NULL OR classification.active=0';
final sqlQuery = session.createSQLQuery(query);
def totalunclass = sqlQuery.with {
addEntity(Artifact);
}
I'm using Linq to Sql and have a stored proc that won't generate a class. The stored proc draws data from multiple tables into a flat file resultset.
The amount of data returned must be as small as possible, the number of round trips to the Sql Server need to be limited, and the amount of server-side processing must be limited as this is for an ASP.NET MVC project.
So, I'm trying to write a Linq to Sql Query however am struggling to both replicate and limit the data returned.
Here's the stored proc that I'm trying to convert:
SELECT AdShops.shop_id as ID, Users.image_url_75x75, AdShops.Advertised,
Shops.shop_name, Shops.title, Shops.num_favorers as hearts, Users.transaction_sold_count as sold,
(select sum(L4.num_favorers) from Listings as L4 where L4.shop_id = L.shop_id) as listings_hearts,
(select sum(L4.views) from Listings as L4 where L4.shop_id = L.shop_id) as listings_views,
L.title AS listing_title, L.price as price, L.listing_id AS listing_id, L.tags, L.materials, L.currency_code,
L.url_170x135 as listing_image_url_170x135, L.url AS listing_url, l.views as listing_views, l.num_favorers as listing_hearts
FROM AdShops INNER JOIN
Shops ON AdShops.shop_id = Shops.shop_id INNER JOIN
Users ON Shops.user_id = Users.user_id INNER JOIN
Listings AS L ON Shops.shop_id = L.shop_id
WHERE (Shops.is_vacation = 0 AND
L.listing_id IN
(
SELECT listing_id
FROM (SELECT l2.user_id , l2.listing_id, RowNumber = ROW_NUMBER() OVER (PARTITION BY l2.user_id ORDER BY NEWID())
FROM Listings l2
INNER JOIN (
SELECT user_id
FROM Listings
GROUP BY
user_id
HAVING COUNT(*) >= 3
) cnt ON cnt.user_id = l2.user_id
) l2
WHERE l2.RowNumber <= 3 and L2.user_id = L.user_id
)
)
ORDER BY Shops.shop_name
Now, so far I can return a flat file but am not able to limit the number of listings. Here's where I'm stuck:
Dim query As IEnumerable = From x In db.AdShops
Join y In (From y1 In db.Shops
Where y1.Shop_name Like _Search + "*" AndAlso y1.Is_vacation = False
Order By y1.Shop_name
Select y1) On y.Shop_id Equals x.shop_id
Join z In db.Users On x.user_id Equals z.User_id
Join l In db.Listings On l.Shop_id Equals y.Shop_id
Select New With {
.shop_id = y.Shop_id,
.user_id = z.user_id,
.listing_id = l.Listing_id
} Take 24 ' Fields ommitted for briefity...
I assume to select a random set of 3 listings per shop, I'd need to use a lambda expression however am not sure how to do this. Also, need to add in somewhere consolidated totals for listing fieelds against individual shops...
Anyone have any thoughts?
UPDATE:
Here's the current solution that I'm looking at:
Result class wrapper:
Public Class NewShops
Public Property Shop_id As Integer
Public Property listing_id As Integer
Public Property tl_listing_hearts As Integer?
Public Property tl_listing_views As Integer?
Public Property listing_creation As Date
End Class
Linq + code:
Using db As New Ads.DB(Ads.DB.Conn)
Dim query As IEnumerable(Of IGrouping(Of Integer, NewShops)) =
(From x In db.AdShops
Join y In (From y1 In db.Shops
Where (y1.Shop_name Like _Search + "*" AndAlso y1.Is_vacation = False)
Select y1
Skip ((_Paging.CurrentPage - 1) * _Paging.ItemsPerPage)
Take (_Paging.ItemsPerPage))
On y.Shop_id Equals x.shop_id
Join z In db.Users On x.user_id Equals z.User_id
Join l In db.Listings On l.Shop_id Equals y.Shop_id
Join lt In (From l2 In db.Listings _
Group By id = l2.Shop_id Into Hearts = Sum(l2.Num_favorers), Views = Sum(l2.Views), Count() _
Select New NewShops With {.tl_listing_views = Views,
.tl_listing_hearts = Hearts,
.Shop_id = id})
On lt.Shop_id Equals y.Shop_id
Select New NewShops With {.Shop_id = y.Shop_id,
.tl_listing_views = lt.tl_listing_views,
.tl_listing_hearts = lt.tl_listing_hearts,
.listing_creation = l.Creation,
.listing_id = l.Listing_id
}).GroupBy(Function(s) s.Shop_id).OrderByDescending(Function(s) s(0).tl_listing_views)
Dim Shops as New Dictionary(Of String, List(Of NewShops))
For Each item As IEnumerable(Of NewShops) In query
Shops.Add(item(0).shop_name, (From i As NewShops In item
Order By i.listing_creation Descending
Select i Take 3).ToList)
Next
End Using
Anyone have any other suggestions?
From the looks of that SQL and code, I'd not be turning it into LINQ queries. It'll just obfuscate the logic and probably take you days to get it correct.
If SQLMetal doesn't generate it properly, have you considered using the ExecuteQuery method of the DataContext to return a list of the items you're after?
Assuming that your sproc you're trying to convert is called sp_complicated, and takes in one parameter, something like the following should do the trick
Protected Class TheResults
Public Property ID as Integer
Public Property image_url_75x75 as String
'... and so on and so forth for all the returned columns. Be careful with nulls
End Class
'then, when you want to use it
Using db As New Ads.DB(Ads.DB.Conn)
dim results = db.ExecuteQuery(Of TheResults)("exec sp_complicated {0}", _Search)
End Using
Before you freak out, that's not susceptible to SQL Injection. L2SQL uses proper SQLParameters, as long as you use the squigglies and don't just concatenate the strings yourself.