I am trying to fetch records from database in the sense that
it should getrecords where name contains "searchKey" and name not in the excludeTerms array with comma seperated.
How can I do this in Linq?
Rows = (from u in DB.Clients
where u.Name.Contains(searchTerm) && !u.Name.Contains(string.Join(",", excludeTerms.Select(s => "'" + s + "'").ToArray()))
select new ClientModel
{
Name = u.FullName,
Id = u.Id,
}).Take(5).ToList();
Where excludeTerms contains list of elements, such as
1)Sandy
2)Mandy
3)Larry etc
List<string> excludeTerms = new List<string>();
Unfortunately you can use local sequences only with Contains operator (which is translated into SQL IN operator). So, you can move whole filtering to memory
Rows = (from u in DB.Clients.AsEnumerable()
where u.Name.Contains(searchTerm) &&
!excludeTerms.Any(s => u.Name.Contains(s))
select new ClientModel {
Name = u.FullName,
Id = u.Id,
}).Take(5).ToList();
Or just filtering out excluded terms:
Rows = (from u in DB.Clients
where u.Name.Contains(searchTerm)
select new ClientModel {
Name = u.FullName,
Id = u.Id,
}).AsEnumerable()
.Where(m => !excludeTerms.Any(s => m.Name.Contains(s)))
.Take(5).ToList();
Related
I am currently using Linq to join two tables together, mainTable and selectTable, they are joined on mainTable.ID = selectTable.mtID. I am trying to include a third table, myTable, that is joined on selectTable.ID = myTable.selID. There will be many records in myTable for one ID from selectTable so I'm trying to get List<myTable>. This is what I have so far that works:
public async Task<List<mainTableDto>> listAll()
{
var db = _repository.DbContext;
var result = await ( from mt in db.mainTable
join sel in db.selectTable
on mt.ID equals sel.mtID
select new mainTableDto
{
ID = mt.ID,
createDate = mt.createDate,
selectTable = new selectTableDto
{
ID = sel.ID
name = sel.name
}
}
}).ToListAsync;
return result;
I've tested getting data from selectTableDto with List< myTableDto> and it works.
I'm a little stuck on how to include a List<myTableDto> into this nested call. I've tried:
join sel in db.selectTableInclude(x=>x.myTableDto)
But when I do this I don't get the info from myTableDto and just get null instead (I've put data in the DB so there should be something)
I've also tried:
join sel in db.selectTable
on mt.ID equals sel.mtID
join my in db.myTable
on sel.ID equals my.selID
selectTable = new selectTableDto
{
ID = sel.ID
name = sel.name
myTableDto = new List<myTableDto>
{
ID = my.ID
}
}
But when I do this it says "ID is not a member of myTableDTO".
Any advice on what I'm doing wrong?
I believe you want a groupjoin (method syntax) or into (query syntax)
This is query syntax:
from mt in db.mainTable
join sel in db.selectTable
on mt.ID equals sel.mtID
into mainTableSels
select new mainTableDto
{
ID = mt.ID,
createDate = mt.createDate,
selectTable = from mts in mainTableSels select new selectTableDto
{
ID = mts.ID
name = mts.name
}
}
Though I do personally prefer a hybrid query/method syntax:
from mt in db.mainTable
join sel in db.selectTable
on mt.ID equals sel.mtID
into mainTableSels
select new mainTableDto
{
ID = mt.ID,
createDate = mt.createDate,
selectTable = mainTableSels.Select(mts => new selectTableDto
{
ID = mts.ID
name = mts.name
})
}
I'm not clear on what type your mainTableDto.selectTable property is; if it's an array or list you'll need a ToArray/ToList. If it's IEnumerable then it should work without
I need to build a search query with dynamic parameters in net core 3.0.
IQueryable<UserDto> query =
from user in dbContext.DB_USER
join items in dbContext.DB__ITEMS on user.IdItem equals items.IdItem
join cars in dbContext.DB_CARS on user.IdCars equals cars.IdItem
join statsCar in dbContext.DB_STATS_CARS on cars.IdCars equals statsCar.Id
select new UserDto
{
Id = user.Id,
Name = user.Name,
Data = user.Data.HasValue ? user.Data.Value.ToUnixTime() : default(long?),
Lvl = user.L,
Items = new ItemsUdo
{
Id = items.Id,
Type = items.Type,
Value = items.Value
},
Cars = new CarsDto
{
Id = cars.Id,
Model = cars.model,
Color = cars.Color
}
};
I would like to add search parameters like user name, items type, cars model and data from user. I tried to add "where" before 'select new UserDto' but not always user will provide all search parameters. If I give below:
if(fromSearch.UserName != null && fromSearch.UserName.Lenght > 0)
{
query = query.Where(u => u.Name == fromSearch.UserName);
}
it works(on user.data does not work) but is it correct? How to do this in linq query?
Do something like this:
IQueryable<UserDto> query =
from user in dbContext.DB_USER
join items in dbContext.DB__ITEMS on user.IdItem equals items.IdItem
join cars in dbContext.DB_CARS on user.IdCars equals cars.IdItem
join statsCar in dbContext.DB_STATS_CARS on cars.IdCars equals statsCar.Id;
select new UserDto
{
Id = user.Id,
Name = user.Name,
Data = user.Data.HasValue ? user.Data.Value.ToUnixTime() : default(long?),
Lvl = user.L,
Items = new ItemsUdo
{
Id = items.Id,
Type = items.Type,
Value = items.Value
},
Cars = new CarsDto
{
Id = cars.Id,
Model = cars.model,
Color = cars.Color
}
};
if(!string.IsNullOrWhitespace(username))
query = query.Where(ud => ud.Name == username);
if(!string.IsNullOrWhitespace(itemtype))
query = query.Where(ud => ud.Items.Any(i => i.Type == itemtype));
if(!string.IsNullOrWhitespace(carmodel))
query = query.Where(ud => ud.Cars.Any(c => c.Model == carmodel));
etc. These will work like AND; if you specify a username and an itemtype you get only those users named that, with that item type somewhere in the items list.. etc
I have a 3 tables Dish, Wine, Suggestion.
Then the idea is use table suggestion table to put the dish and the wine making one of them suggestion each other.
I'm using LINQ, but when one product doesn't have a suggestion he does not add to the json.
var query = (from m in db.Dish
join t in db.TypeDish on m.idTypeDish equals t.idTypeDish
join i in db.ImageDish on m.idDish equals i.idDish into g
join s in db.Suggestion on m.idDish equals s.idDish
join si in db.ImageWine on s.idWine equals si.idWine into f
where m.idTypeDish == dish
select new DishModel()
{
Name = m.name,
CalorificValue = m.calorificValue,
Price = m.price,
ShortName = m.shortName,
Time = m.manufactureTime,
Description = m.description,
UrlImageList = g.Select(i => _url + i.Image.urlImage).ToList(),
BeveragesList = new List<BeverageModel>()
{
new BeverageModel()
{
Name = s.Wine.name,
ShortName = s.Wine.shortName,
Price = s.Wine.price,
Description = s.Wine.description,
AlcoholContent = s.Wine.alcoholContent,
WineEnum = WineEnum.WhiteWine,
Region = s.Wine.Region.name,
WineCaste = s.Wine.wineCaste,
UrlImageList = f.Select(i => _url+i.Image.urlImage).ToList(),
}
}
}).ToList();
return query;
Now I have 2 items on DB, and he sends only one because the other don't have a suggestion.
The error is on joins probably, but I'm a newbie in Linq.
Thanks.
I have SQL query and i would like to rewrite it by linq. This sql command only joins two table and do group by on them. Problem is in group by. When i use group by on one table, all is ok and linq commant returns the same result as sql command. But when i want to join two table and then group by H.Ucet (for example) then it returns other result as my sql command. The result is the same as when using a Left Join, but i want default inner join.
This is sql command:
string dotazBankUcty = #"SELECT
H.UCET,
SUM(H.MD) AS MD,
SUM(H.DAL) AS DAL ,
SUM(H.MD_M) AS MD_M,
SUM(H.DAL_ENA) DAL_M,
MAX(UBUC.KOD) AS KOD
FROM ACCOUNT H
inner join UBU on H.UCET = UBU.UCET GROUP BY H.UCET";
I try to rewrite it by this linq command.
var accountQuery = new XPQuery<ACCOUNT >(CoreHelper.DataSession);
var ubuQuery = new XPQuery<UBU>(CoreHelper.DataSession);
var resultBankyUcty = (from h in accountQuery
join u in ubuQuery on h.CompoundKey1.UCET equals u.UCET
group new { h, u } by new { h.CompoundKey1.UCET } into gUcty
select new
{
Ucet = gUcty.Key.UCET,
MD = gUcty.Sum(k => k.h.MD),
DAL = gUcty.Sum(k => k.h.DAL),
MD_M = gUcty.Sum(k => k.h.MDM),
DAL_M = gUcty.Sum(k => k.h.DALM),
KOD = gUcty.Max(k => k.u.KOD)
});
Can anyone help me ? I can't see an error.
from t in (
from h in accountquery
join u in ubuQuery on h.CompoundKey1.UCET equals u.UCET
select new {h,u}
) group t by new {t.h.CompoundKey1.UCET} into g
select new {
Ucet = g.Key.UCET,
MD = g.Sum(k => k.h.MD),
DAL = g.Sum(k => k.h.DAL),
MD_M = g.Sum(k => k.h.MDM),
DAL_M = g.Sum(k => k.h.DALM),
KOD = g.Max(k => k.u.KOD)
};
I am trying to convert this T-SQL to a Linq To SQL but can't work out the group by aggregate functions. Any help welcome.
select c.ClientID, GivenName, Surname, max(a.Address), max(t.Value)
from Client c
left join ClientAddress a on c.ClientID = a.ClientID
left join ClientContact t on c.ClientID = t.ClientID
group by c.ClientID, GivenName, Surname
To group by a composite key, you typically use an anonymous type:
var qry = from x in someSource
group x by new { x.ClientID, x.GivenName, x.Surname } into grp
select new { grp.Key, Address = grp.Max(x => x.Address),
Value = grp.Max(x => x.Value) };
The exact answer I came up with was
public IQueryable<ClientSearchDTO> GetClientsDTO()
{
return (from client in this.Context.Clients
join address in this.Context.ClientAddresses on client.ClientID equals address.ClientID
join contact in this.Context.ClientContacts on client.ClientID equals contact.ClientID
where contact.ContactType == "Phone"
group client by new { client.ClientID, client.Surname, client.GivenName } into clientGroup
select new ClientSearchDTO()
{
ClientID = clientGroup.Key.ClientID,
Surname = clientGroup.Key.Surname,
GivenName = clientGroup.Key.GivenName,
Address = clientGroup.Max(x => x.ClientAddresses.FirstOrDefault().Address),
PhoneNumber = clientGroup.Max(x => x.ClientContacts.FirstOrDefault().Value)
});
}