I have to following LINQ code:
var variable1 = _entitiesContext.Table1
.Include("Table2")
.Include("Table3")
.Include("Table4")
.Join(_entitiesContext.Table2, t1 => t1.F_ID, t2 => t2.F_ID, (tbl1, tbl2) => new { tbl1, tbl2 })
.SelectMany(j => j.tbl2.Table3.Select(t3 => new
{
j.tbl2.F_ID,
j.tbl2.F_ZGP_No,
j.tbl1.F_NAME,
j.tbl1.K_CODE,
t3.Table4.Name,
t3.Table4.LEI,
}))
.Distinct()
.OrderBy(s => s.F_ID)
.ThenBy(s => s.Name)
.ToList();
How can I read it like a SQL statement? I don't understand the workflow about the .Includes.
Related
as am a beginner,i want to get the following set of query as linq with a detailed explanation
//my sql
select COL.title as organizationtitle,CL.[title] as
cousestitle,sum(FD.feathers) as totalfeathers,sum(FD.amount) as
totalamount
from [dbo].[FeathersDonated] FD
join [dbo].[Couses] C on FD.corpid=3 and FD.[cousesid]=C.id
join [dbo].[Couses_lang] CL on FD.[cousesid]=CL.cousesid and
CL.language='en-US'
JOIN [dbo].[Organization_lang] COL on COL.orgid=2 and COL.language='en
US'
group by FD.cousesid,CL.[title],CL.[description],COL.title
i have tried the following set of code. please do help
var featherDonated = _GoUoW.FeathersDonated.FindBy(x => x.corpid ==
param.corpid)
.GroupBy(x => x.cousesid).Select(x => new { cousesid = x.Key, amount =
x.Select(a => a.amount).DefaultIfEmpty(0).Sum(), feathers = x.Select(a =>
a.feathers).DefaultIfEmpty(0).Sum() })
.Join(_GoUoW.Couses.GetAll(), feather => feather.cousesid, couse =>
couse.id, (feather, couse) => new { feather, couse })
.Join(_GoUoW.Organization_lang.FindBy(orglang => orglang.language == "en-
US"), couses => couses.couse.orgid, orgid => (param.organizationid > 0 ?
param.organizationid : orgid.orgid), (couses, orgid) => new { couses,
orgid
})
.Join(_GoUoW.Couses_lang.FindBy(couselang => couselang.language == "en-
US"),
organization => organization.orgid.orgid, couselang => couselang.cousesid,
(organization, couselang) => new { organization, couselang })
.Select(x => new
{
x.organization.couses.feather.amount,
x.organization.couses.feather.feathers,
x.couselang.title
//x.organization.orgid.title,
}).ToList();
Please need some help converting this sql query to nhibernate
select a.ID, count(b.ID)
from appusers a
left join weeklytasks b on a.ID = b.TaskOwner and b.taskstatus = 1
group by a.ID
It's difficult to answer without knowing your entities, mappings, used technology(ICreteria API, QueryOver, Linq).
But I can suggest this solution using QueryOver:
AppUser ownerAlias = null;
WeeklyTask taskAlias = null;
var result = Session.QueryOver(() => taskAlias)
.JoinAlias(x => x.TaskOwner,
() => ownerAlias,
NHibernate.SqlCommand.JoinType.RightOuterJoin,
Restrictions.Where(() => taskAlias.Status == 1))
.SelectList(list => list
.SelectGroup(x => ownerAlias.Id)
.SelectCount(x => x.Id))
.List<object[]>();
or this:
var result = Session.QueryOver<WeeklyTask>()
.Where(x => x.Status == 1)
.Right.JoinQueryOver(x => x.TaskOwner)
.SelectList(list => list
.SelectGroup(x => x.TaskOwner.Id)
.SelectCount(x => x.Id))
.List<object[]>();
Please notice that in this approach your WeeklyTask entity must contains mapped reference to AppUser entity.
I have the following query in nHibernate, which works really well.
Table1 table1Alias = null;
Table2 table2Alias = null;
Table3 table3Alias = null;
Table4 table4Alias = null;
Table5 table5Alias = null;
Table6 table6Alias = null;
var resultTable = session.QueryOver<Table1>()
.JoinAlias(x => x.Table2, () => table2Alias, NHibernate.SqlCommand.JoinType.LeftOuterJoin)
.JoinAlias(() => table2Alias.Table3, () => itemDesctable3AliasriptionAlias, NHibernate.SqlCommand.JoinType.LeftOuterJoin)
.JoinAlias(() => table2Alias.Table4, () => table4Alias, NHibernate.SqlCommand.JoinType.LeftOuterJoin)
.JoinAlias(x => x.Table5, () => table5Alias, NHibernate.SqlCommand.JoinType.LeftOuterJoin)
.JoinAlias(() => table5Alias.Table6, () => table6Alias, NHibernate.SqlCommand.JoinType.LeftOuterJoin)
.Where(x => x.Id == inputId)
.TransformUsing(Transformers.DistinctRootEntity)
.SingleOrDefault();
the problem is, i suspect i'll run into performance issues because
some of the tables have a lot of columns.
So here's the question, let's say I only need 1 field from "Table 5", but
fields from the rest of the table, do i have to do manual projections for all tables? or is there a way to only do manual projection for one table but left the rest as is?
I am trying to convert this inefficient query into one that projects into a dto.
Original query looks like this:
var flatFeePolicies = _session.QueryOver<FlatChargeAccessFee>(() => flatChargeAccessFeeAlias)
.JoinAlias(x => x.AgreementAccessFee, () => agreementAccessFeeAlias)
.JoinQueryOver(x => x.ClientPolicy, () => clientPolicyAlias)
.Where(y => agreementAccessFeeAlias.Agreement.Id == request.AgreementId)
.List()
.Select(x => new FlatChargeAccessFeeInfo()
{
FlatChargeAccessFeeId = x.Id,
ClientName = x.ClientPolicy.Bid.Client.Name,
PolicyNumber = x.ClientPolicy.PolicyNumber,
ClientPolicyId = x.ClientPolicy.Id,
AgreementAccessFeeId = x.AgreementAccessFee.Id,
ShouldCheckBeGenerated = x.ShouldCheckBeGenerated,
MonthlyFee = x.MontlyFeeAmount.Amount.ToString(),
PolicyYear = x.ClientPolicy.PolicyNumber.Year
})
.ToList();
I tried it like this:
var flatFeePolicies = _session.QueryOver<FlatChargeAccessFee>(() => flatChargeAccessFeeAlias)
.JoinAlias(x => x.AgreementAccessFee, () => agreementAccessFeeAlias)
.JoinQueryOver(x => x.ClientPolicy, () => clientPolicyAlias)
.Where(y => agreementAccessFeeAlias.Agreement.Id == request.AgreementId)
.SelectList(list => list
.Select(x => x.Id).WithAlias(() => feeInfo.FlatChargeAccessFeeId)
.Select(x => x.ClientPolicy.Bid.Client.Name).WithAlias(() => feeInfo.ClientName)
.Select(x => x.ClientPolicy.PolicyNumber).WithAlias(() => feeInfo.PolicyNumber)
.Select(x => x.ClientPolicy.Id).WithAlias(() => feeInfo.ClientPolicyId)
.Select(x => x.AgreementAccessFee.Id).WithAlias(() => feeInfo.AgreementAccessFeeId)
.Select(x => x.ShouldCheckBeGenerated).WithAlias(() => feeInfo.ShouldCheckBeGenerated)
.Select(x => x.MontlyFeeAmount.Amount.ToString()).WithAlias(() => feeInfo.MonthlyFee)
.Select(x => x.ClientPolicy.PolicyNumber.Year).WithAlias(() => feeInfo.PolicyYear)
)
.TransformUsing(Transformers.AliasToBean<FlatChargeAccessFeeInfo>())
.List<FlatChargeAccessFeeInfo>();
and I am getting an error that variable "x" has been referenced in scope but was not defined. What is the proper syntax to convert this?
After help from Andrew, here is the correct version that works
ClientPolicy clientPolicyAlias = null;
Client clientAlias = null;
Bid bidAlias = null;
AgreementAccessFee agreementAccessFeeAlias = null;
FlatChargeAccessFee flatChargeAccessFeeAlias = null;
FlatChargeAccessFeeInfo feeInfo = null;
var flatFeePolicies = _session.QueryOver<FlatChargeAccessFee>(() => flatChargeAccessFeeAlias)
.JoinAlias(a => a.AgreementAccessFee, () => agreementAccessFeeAlias)
.JoinQueryOver(b => b.ClientPolicy, () => clientPolicyAlias)
.JoinAlias(b=>b.Bid,()=>bidAlias)
.JoinAlias(b=>b.Client, ()=>clientAlias)
.Where(c => agreementAccessFeeAlias.Agreement.Id == request.AgreementId)
.SelectList(list => list
.Select(d => d.Id).WithAlias(() => feeInfo.FlatChargeAccessFeeId)
.Select(e => clientAlias.Name).WithAlias(() => feeInfo.ClientName)
.Select(e => clientAlias.Number).WithAlias(() => feeInfo.ClientNumber)
.Select(f => bidAlias.OptionNumber).WithAlias(() => feeInfo.BidOptionNumber)
.Select(f => bidAlias.Year).WithAlias(()=>feeInfo.PolicyYear)
.Select(g => clientPolicyAlias.Id).WithAlias(() => feeInfo.ClientPolicyId)
.Select(h => agreementAccessFeeAlias.Id).WithAlias(() => feeInfo.AgreementAccessFeeId)
.Select(j => j.ShouldCheckBeGenerated).WithAlias(() => feeInfo.ShouldCheckBeGenerated)
.Select(k => k.MontlyFeeAmount.Amount).WithAlias(()=>feeInfo.MonthlyFee)
)
.TransformUsing(Transformers.AliasToBean<FlatChargeAccessFeeInfo>())
.List<FlatChargeAccessFeeInfo>();
You're close, a few things though:
This select:
.Select(x => x.MontlyFeeAmount.Amount.ToString()).WithAlias(() => feeInfo.MonthlyFee)
will not work. QueryOver attempts to turn your code directly into SQL. If the property does not exist as a column in the database, the query won't work properly (unless you're using a mapped custom type, QueryOver can handle those)
Nested property access won't work either:
.Select(x => x.ClientPolicy.Bid.Client.Name).WithAlias(() => feeInfo.ClientName)
for a similar reason listed above. QueryOver will attempt to turn your property access directly into SQL. You'll need to explicitly join from ClientPolicy to Bid to Client.
In general, remember that you're writing code that's going to be turned into SQL. In fact, I normally write the SQL I want to generate first and then write the QueryOver that corresponds to that. Hope that helps!
Hello i'm trying to achieve the following SQL
SELECT this_.*
FROM WorkItems this_
WHERE this_.UserId = (
SELECT this_1_.y0_ as y0_
FROM
(
SELECT top 1 this_0_.UserId as y0_, count(this_0_.UserId) as y1_
FROM WorkItems this_0_
WHERE this_0_.StateId = 1 and this_0_.Type like 'Data'
GROUP BY this_0_.UserId
ORDER BY y1_ desc
) this_1_
);
so far i have manged to produce something fairly close. I'm missing the part where i just select out the userId.
heres the query so far
var subquery = QueryOver.Of<WorkItem>().Where(w => w.State == state)
.AndRestrictionOn(w => w.Type).IsLike(type, MatchMode.Exact)
.SelectList(list =>
list.SelectGroup(w => w.UserId)
.WithAlias(() => resultAlias.userId)
.SelectCount(w => w.UserId)
.WithAlias(() => resultAlias.count))
.OrderByAlias(() => resultAlias.count)
.Desc().Take(1);
var query =
CurrentSession.QueryOver<WorkItem>()
.WithSubquery
.WhereProperty(p => p.UserId)
.Eq(subquery);
Try this: -
var subquery = QueryOver.Of<WorkItem>().Where(w => w.State == state)
.AndRestrictionOn(w => w.Type).IsLike(type, MatchMode.Exact)
.SelectList(list => list.SelectGroup(w => w.UserId))
.OrderBy(Projections.Count<WorkItem>(x => x.UserId))
.Desc().Take(1);
var query = CurrentSession.QueryOver<WorkItem>()
.WithSubquery
.WhereProperty(p => p.UserId)
.Eq(subquery);