I made this request for get all brands and all items of theses brand with leftJoin :
$brands = Doctrine_Query::create()
->from('Brand b')
->leftJoin('b.Item i')
->fetchArray();
But I want to get only 10 items of each brand, how can I put the limit on Item leftJoin ?
You have to use subquery like this:
->leftJoin('b.Item i WITH i.id IN (SELECT i2.id FROM Item i2 WHERE i2.brand_id=b.id LIMIT 10)')
I didn't test this but it should work.
I know it's late but this actually scored nr 1 on my google search and is unanswered:
Limiting a doctrine query with a fetch-joined collection? suggests using Paginaror object
Here is an example:
My code has Sources that contain rss links and Articles that are articles from the rss feed. So in this example I'll get one Source and all it's articles.
// get the articles (latest first) from source 743
$q=$this->getDoctrine()->getManager()
->createQuery('select s, a from MyCompanyRssBundle:Source s
join s.Articles a
where s.id = :id
order by a.id desc')
->setParameter('id',743);
$q->setMaxResults(1); // this limits Articles to be only 1
// when using $q->getResult();
$sources=new Paginator($q, $fetchJoin = true);
$sources=$sources->getIterator();
// $sources=$q->getResult();
var_dump($sources[0]->getArticles());
Related
The code below is what I have to get all the duplicated products (by title) and group them together. It works perfectly fine. However, I so many records in my Products table and getting all of them causes a performance issue. Is there a way this could be optimised to avoid getting all records and group them in one query? Thank you.
$products = Product::all();
$groupsOfProducts = $products->groupBy('title');
$duplicatedProductsGrouped = [];
foreach($groupsOfProducts as $productGroup) {
$productIsDuplicated = $productGroup->count() > 1;
if($productIsDuplicated) {
$duplicatedProductsGrouped[] = $productGroup;
}
}
var_dump($duplicatedProductsGrouped);
You can use having in the group by:
Product::groupBy('title')->having(DB::raw('count(*)'), ">", "1")->select('title')->get()
And you will get the titles of the duplicates, then you can query the database with those titles
EDIT:
Please also try and see if this is faster
Product::getQuery()->whereIn('title', array_column( DB::select('select title from products group by title having count(*) > 1'), 'title'))->get();
with this line you will get ONLY the products that has a duplicate title, and so your Collection groupby should be faster to aggregate the records by the title
Let your database do the work. When you call Product::all(), you're getting every single record, then making PHP do the rest. Change your query to something like the following:
Product::selectRaw("title, COUNT(*) AS count")->groupBy("title")->get();
The result will be a Collection of Product instances with a title and count attribute, which you can access and determine duplicated ones:
$products = Product::selectRaw("title, COUNT(*) AS count")->groupBy("title")->get();
$duplicatedProducts = collect([]);
foreach($products AS $product){
if($product->count > 1){
$duplicatedProducts->push($product);
}
}
dd($duplicatedProducts);
I have two entities who are N:N - related with each other. With an example I'll show you what I mean :
I have a Session (ave_Session) and there we can put "Trainers"
(ave_trainer) on each Session
I'm tryting to get a list of al the
"Trainers" for a particular Session
They are related to each other in
N:N (relationship name : ave_ave_session_ave_trainer)
I work in VS2010 and with C# => I'm trying to get the data through LINQ
I recently just started with LINQ, so maybe you guys can help me out on this one. The following I've tried and i gave me an "AttributeFrom and AttributeTo must be either both specified or both ommited. You can not pass only one or the other. AttributeFrom: , AttributeTo: ave_trainerid"-error :
var formatteurs = (from f in ORGContext.CreateQuery<ave_trainer>()
join s in ORGContext.CreateQuery<ave_ave_session_ave_trainer>() on f.Id equals s.ave_trainerid.Value
join c in ORGContext.CreateQuery<ave_session>() on s.ave_sessionid.Value equals c.Id
where c.Id == item.Id
select f).ToList();
The item.id is the Id of the session. Thx in advance if you can help me out!
From the MSDN page:
// List the contacts in the Softball team marketing list.
System.Console.WriteLine("List all contacts in Softball Team:");
var members = from c in crm.contacts
join mlm in crm.listmembers on c.contactid equals mlm.entityid
join ml in crm.lists on mlm.listid equals ml.listid
where ml.listname == "Softball Team"
select c;
foreach (var c in members)
{
System.Console.WriteLine(c.fullname + " " + c.emailaddress1);
}
It seems a little backwards the way you have it written now (assuming I'm parsing it correctly).
What you'd normally do is put your 'starting thing' first and then go through the mapping to get to the ones you want. I don't have any CRM 2011 experience, so hopefully I didn't mess this up too much. :)
Also, I'm not a fan of single-character names, so I took the liberty of using longer names :)
var formatteurs = (
// first get the session we're interested in
from session in ORGContext.CreateQuery<ave_session>()
where session.Id == item.Id
// now get the mapping rows that are related to it
join mapping in ORGContext.CreateQuery<ave_ave_session_ave_trainer>()
on session.Id equals s.ave_sessionid.Value
// now get from the mapping rows to the actual trainers
join trainer in ORGContext.CreateQuery<ave_trainer>()
on mapping.ave_trainerid.Value equals trainer.Id
select trainer
).ToList();
I have 3 tables: DiaryPosts, DiaryImpressions, Impressions.
Impressions is a small list with some fields: 'like', 'dislike', 'agree', 'disagree'. The user can vote according to what he thinks about the post.
DiaryImpressions is the table that handles the relationship between the posts and the users who vote.
My problem is, I have to count results of each impression vote for each post, so maybe for one post 13 users voted for like, 2 for dislike, 34 agree and 1 disagree.
I have no idea how to perform the query in some way I can get this specific count results for each impression.
Can anyone help me with that?
You can do this via the GroupBy method. It allows you to automatically "group" the elements based on the impression, and count the results per group.
var post(from c in posts selec c)
string post1like;
string post2dislike;
string postagree3;
string postdisagree3;
foreach (var item in posts)
{
var ipressionslike=(from c in imressions where impressioid=item.id where c.impressionID='LIKE' select c.userID).Tolist()
var ipressionsdislike=(from c in imressions where impressioid=item.id where c.impressionID='disLIKE' select c.userID).Tolist()
var ipressionslike=(from c in imressions where impressioid=item.id where c.impressionID='LIKE' select c.userID).Tolist()
var ipressionsagree=(from c in imressions where impressioid=item.id where c.impressionID='disLIKE' select c.userID).Tolist()
post1like+=item.id+""+ipressionsdislike.count;
post2dislike+=item.id+""+ipressionslike.count;
postagree3+=item.id+""+ipressionsagree.count;
}
it should count the impressions for each post and count the amount of users that like or dislike so if you have 30 people dislike for each post it should get them I cannot see your table structure but I hope it will help or point you somewhere
I have to guess but here is what I think the SQL would look like:
SELECT I.Name, COUNT(I.Name)
FROM DairyPosts P
JOIN DairyImpressions DI ON P.ID=DI.DairyID
JOIN Impressions I ON DI.ImpressionsID = I.ID
And what the linq would look like:
List<Dairy> dairyposts = GetDairyPosts();
var impressionCounts =
from p in dairyposts
group p by p.ImpressionName into g
select new { Type = g.Key, ImpressionCount = g.Count() };
Of course I have to assume your list is created a certain way, if you can post how your list is actually created that would help. (As I said in the comments)
I'm really, really struggling with what should otherwise be a straightforward query in anything other than LINQ (for example SQL!)
I have two entities:
Product
ProductApprover
The Product entity has a one to many relationship on the ProductApprover entity, e.g:
Product.ProductApprovers gives me all ProductApprover entities relating to the Product.
Getting a Product and associated ProductApprover data is simple enough when querying by my ProductID column on my Product entity as the ProductApprover data associated is bundled into the result automatically, but my problem comes when I want to alter my query by querying data WITHIN my associated ProductApprover entities. I have tried all sorts with use of the 'Where', 'Contains' and 'Any', functions, etc, to perform a subquery, but cannot seem to get the result I want.
The query I want to perform is:
SELECT * FROM Product p
INNER JOIN ProductApprover pa ON p.ProductId = pa.ProductId
WHERE p.ProductId = #id AND pa.Version = #version
Can anybody help me out please? Thank you kindly in advance.
Try this (I guess this is a LINQ interpretation of your SQL query):
int id = 123;
int version = 555;
var results = from p in context.Products
join pa in context.ProductApprovers
on p.ProductId = pa.ProductId
where p.ProductId equals id && pa.Version equals version
select new { Product = p, Approver = pa };
I suspect you want something like this:
var query = from product in db.Products
where product.ProductId == productId
select new {
Product = product,
Approvers = product.Approvers.Where(pa => pa.Version == version)
};
If that doesn't do what you want, could you explain where it falls down?
I have some Linq code and it's working fine. It's a query that has a subquery in the Where clause. This subquery is doing a groupby. Works great.
The problem is that I don't know how to grab one of the results from the subquery out of the subquery into the parent.
Frst, here's the code. After that, I'll expplain what piece of data i'm wanting to extract.
var results = (from a in db.tblProducts
where (from r in db.tblReviews
where r.IdUserModified == 1
group r by
new
{
r.tblAddress.IdProductCode_Alpha,
r.tblAddress.IdProductCode_Beta,
r.tblAddress.IdProductCode_Gamma
}
into productGroup
orderby productGroup.Count() descending
select
new
{
productGroup.Key.IdProductCode_Alpha,
productGroup.Key.IdProductCode_Beta,
productGroup.Key.IdProductCode_Gamma,
ReviewCount = productGroup.Count()
}).Take(3)
.Any(
r =>
r.IdProductCode_Alpha== a.IdProductCode_Alpha&&
r.IdProductCode_Beta== a.IdProductCode_Beta&&
r.IdProductCode_Gamma== a.IdProductCode_Gamma)
where a.ProductFirstName == ""
select new {a.IdProduct, a.FullName}).ToList();
Ok. I've changed some field and tables names to protect the innocent. :)
See this last line :-
select new {a.IdProduct, a.FullName}).ToList();
I wish to include in that the ReviewCount (from the subquery). I'm jus not sure how.
To help understand the problem, this is what the data looks like.
Sub Query
IdProductCode_Alpha = 1, IdProductCode_Beta = 2, IdProductCode_Gamma = 3, ReviewCount = 10
... row 2 ...
... row 3 ...
Parent Query
IdProduct = 69, FullName = 'Jon Skeet's Wonder Balm'
So the subquery grabs the actual data i need. The parent query determines the correct product, based on the subquery filters.
EDIT 1: Schema
tblProducts
IdProductCode
FullName
ProductFirstName
tblReviews (each product has zero to many reviews)
IdProduct
IdProductCode_Alpha (can be null)
IdProductCode_Beta (can be null)
IdProductCode_Gamma (can be null)
IdPerson
So i'm trying to find the top 3 products a person has done reviews on.
The linq works perfectly... except i just don't know how to include the COUNT in the parent query (ie. pull that result from the subquery).
Cheers :)
Got it myself. Take note of the double from at the start of the query, then the Any() being replaced by a Where() clause.
var results = (from a in db.tblProducts
from g in (
from r in db.tblReviews
where r.IdUserModified == 1
group r by
new
{
r.tblAddress.IdProductCode_Alpha,
r.tblAddress.IdProductCode_Beta,
r.tblAddress.IdProductCode_Gamma
}
into productGroup
orderby productGroup.Count() descending
select
new
{
productGroup.Key.IdProductCode_Alpha,
productGroup.Key.IdProductCode_Beta,
productGroup.Key.IdProductCode_Gamma,
ReviewCount = productGroup.Count()
})
.Take(3)
Where(g.IdProductCode_Alpha== a.IdProductCode_Alpha&&
g.IdProductCode_Beta== a.IdProductCode_Beta&&
g.IdProductCode_Gamma== a.IdProductCode_Gamma)
where a.ProductFirstName == ""
select new {a.IdProduct, a.FullName, g.ReviewCount}).ToList();
While I don't understand LINQ completely, but wouldn't the JOIN work?
I know my answer doesn't help but it looks like you need a JOIN with the inner table(?).
I agree with shahkalpesh, both about the schema and the join.
You should be able to refactor...
r => r.IdProductCode_Alpha == a.IdProductCode_Alpha &&
r.IdProductCode_Beta == a.IdProductCode_Beta &&
r.IdProductCode_Gamma == a.IdProductCode_Gamma
into an inner join with tblProducts.