how can I retrieve data from junction table in Code first approach.i know i can add data like this.
Movie.Tag.Add(item)
but want to know how to get back those data in the junction table
This gives you all rows in the junction table - each row is represented as an anonymous object with the two Ids of the row as properties:
var junctionTableDataList = (from m in context.Movies
from t in m.Tags
select new
{
MovieId = m.MovieId,
TagId = t.TagId
}).ToList();
You can add a where clause before the select if you want to limit the result to a specific or a few movies.
Edit
The same with extension methods and lambda expressions would look like this:
var junctionTableDataList = context.Movies
.SelectMany(m => m.Tags.Select(t => new
{
MovieId = m.MovieId,
TagId = t.TagId
}))
.ToList();
Edit 2
If you want return the data from a method you can create a litte helper type and return a list of those "named" objects instead of anonymous objects:
public class JunctionData
{
public int MovieId { get; set; }
public int TagId { get; set; }
}
List<JunctionData> junctionTableDataList
= (from m in context.Movies
from t in m.Tags
select new JunctionData
{
MovieId = m.MovieId,
TagId = t.TagId
}).ToList();
Or ...Select(t => new JunctionData... for the extension method syntax.
Related
I have this simple model.
public class Room
{
public Guid Id { get; set; }
public Guid? postSubjectId { get; set; }
[ForeignKey("postSubjectId")]
public PostSubject postSubject { get; set; }
public string MemberId { get; set; }
[ForeignKey("MemberId")]
public AppUser Member { get; set; }
}
Basically I need to get Grouped postSubjectId along with MemberId.Count() , I know it's easy .. but it never comes with the expected result.
I made this simple GroupBy query
var mmbrs = _context.Rooms
.Select(g => new { id = g.postSubjectId, mmbrscount = g.MemberId })
.AsEnumerable()
.GroupBy(g => new { id = g.id , mmbrscount = g.mmbrscount.Count() }).ToList();
but it gives me unexpected result
However I did the same using ordinary sql query
select [postSubjectId] as postId, count([MemberId]) as mmbrsCount from [dbo].[Rooms] group by [postSubjectId]
and It gives me result as expected
I need to apply that expected result using LINQ GruoupBy extention method
The grouping key new { id = g.postSubjectId, mmbrscount = g.MemberId }) is like typing group by [postSubjectId], count([MemberId]) in SQL.
The correct statement is:
_context.Rooms
.GroupBy(r => r.postSubjectId)
.Select(g => new
{
id = g.Key,
mmbrscount = g.Count()
})
So every Room has exactly one property PostSubjectId, and one string property MemberId.
I need to get Grouped postSubjectId along with MemberId.Count()
Apparently you want to make groups of Rooms that have the same value for property PostSubjectId AND have the same value for MemberId.Count().
var result = dbContext.Rooms.GroupBy(room => new
{
PostSubjectId = room.PostSucjectId,
MemberIdLength = room.MemberId.Count(),
});
The result is a sequence of groups of Rooms. Every group has a key, which is a combination of [PostSubjectId, MemberIdLength]. The group is a sequence of Rooms. All rooms in one group have the same combination of [PostSubjectId, MemberIdLength].
If you don't want a sequence of groups of Rooms, you can use the overload of GroupBy that has a parameter resultSelector
var result = dbContext.Rooms.GroupBy(
// parameter keySelector
room => new
{ PostSubjectId = room.PostSucjectId,
MemberIdLength = room.MemberId.Count(),
},
// parameter resultSelector:
// from every combination of [PostSubjectId, MemberIdLength] (= the key) and
// all rooms that have this combination, make one new object:
(key, roomsWithThisKey) => new
{
// select the properties that you actually plan to use, for example
PostSubjectId = key.PostSubjectId,
MemberIdLength = key.MemberIdLength,
RoomInformations = roomsWithThisKey.Select(roomWithThisKey => new
{
Id = roomWithThisKey.Id,
Member = roomWithThisKey.Member,
...
})
.ToList(),
});
In the code given below i want to join all the three table i get the data by joining the table but while displaying the data only the data of CK_Model is displayed. Please help
public List<CK_Model> GetDetails()
{
try
{
using (var entities = new MobileStore2020Entities())
{
var details = from a in entities.CK_Model
join b in entities.CK_Brand
on a.BrandID equals b.BrandID
join c in entities.CK_Stock
on a.ModelID equals c.ModelID
select new
{
ModelID = a.ModelID,
ModelName = a.ModelName
};
return details.ToList();
Thank You.
If I understand correctly you want to return data from all 3 tables by accessing them through your context. If you want to do this you have change your method's return type. For example create a new class with all 3 item types
public class DetailsItemType
{
public CK_Model Model{ get; set; }
public CK_Brand Brand { get; set; }
public CK_Stock Stock { get; set; }
}
Then change your method's return type to DetailsItemType and you'll have something like the following
public List<DetailsItemType> GetDetails()
{
using (var entities = new MobileStore2020Entities())
{
var details = from a in entities.CK_Model
join b in entities.CK_Brand
on a.BrandID equals b.BrandID
join c in entities.CK_Stock
on a.ModelID equals c.ModelID
select new DetailsItemType
{
Model= a,
Brand = b,
Stock = c
};
return details.ToList();
}
}
Now every time you call GetDetails() you can access all 3 tables. For example
var details = GetDetails();
var model = details.Model;
var brand = details.Brand;
var stock = details.Brand;
I'm new to Entity Framework, I have a DataGridView connected to Entity Framework as it shown below
dgvDebit.DataSource = (from daily in accountingEntities.DailyAccounts
join voucherdetails in accountingEntities.VoucherDetails on daily.DailyId equals voucherdetails.DailyId
where voucherdetails.VoucherId == keyvalue
group voucherdetails by daily.DailyName into dgroup
select new
{
DailyName = dgroup.Key,
SumOfDebit = dgroup.Sum(s => s.Debit)
}).ToList();
My question is: I want to clear DataGridView datasource but every thing I did has failed - please any help here?
OK, so you want to bind to an empty list of the type that you have.
Step 1: define a .NET type for your query result return type:
public class ResultDTO
{
public string DailyName { get; set; }
public decimal SumOfDebit { get; set; }
}
Step 2: change your "normal" query to:
dgvDebit.DataSource = (from daily in accountingEntities.DailyAccounts
join voucherdetails in accountingEntities.VoucherDetails on daily.DailyId equals voucherdetails.DailyId
where voucherdetails.VoucherId == keyvalue
group voucherdetails by daily.DailyName into dgroup
select new ResultDTO
{
DailyName = dgroup.Key,
SumOfDebit = dgroup.Sum(s => s.Debit)
}).ToList();
Step 3: if you want to "clear" the DataGridView, but retain the columns, you can now use:
dgvDebit.DataSource = new List<ResultDTO>();
Let's say I have a Person entity with 3 columns:
public PERSON {
public int OID { get; set; }
public string NAME { get; set; }
public string SURNAME { get; set; }
}
I want to query it with raw SQL but without specifying all columns so I write:
var query = "select NAME, SURNAME from PERSON";
var list = context.SqlQuery<PERSON>(query).ToList();
But it throws Exception:
System.Data.Entity.Core.EntityCommandExecutionException : The data reader is incompatible with the specified '...'. A member of the type, 'OID', does not have a corresponding column in the data reader with the same name.
So it seems like it tries to map all columns, and, if some are missing, it throws.
Is there a way to make it ignore columns that are not present in raw SQL query and map just the columns that are accessible?
The reason is, I have a lot of columns for some entities and sometimes I just want to query partial columns. I don't want to create new class with just the necessary columns for each query.
I can think of 3 options off the top of my head that could work for you.
Option 1: Rewrite your queries and use a standard Linq query:
var persons = from p in context.Persons
select new PERSON
{
NAME = p.NAME,
SURNAME = p.SURNAME
};
Option 2: Return a dummy value for columns you don't need
var query = "select 0 AS OID, NAME, SURNAME from PERSON";
var list = context.SqlQuery<AlmostPERSON>(query).ToList();
Option 3: Create your own intermediate classes with the columns you need from the database:
public class AlmostPERSON
{
public string NAME { get; set; }
public string SURNAME { get; set; }
}
var query = "select NAME, SURNAME from PERSON";
var list = context.SqlQuery<AlmostPERSON>(query).ToList();
You could even project this intermediate class onto your standard entity like this:
var list = context.SqlQuery<AlmostPERSON>(query)
.Select(ap => new PERSON
{
NAME = ap.NAME,
SURNAME = ap.SURNAME
})
.ToList();
Found one more possible solution: using ADO.NET IDataReader with AutoMapper
public List<T> ExecuteFor<T>(string sql)
{
using (_connection = new OracleConnection(_connectionString))
{
_connection.Open();
using (var command = new OracleCommand(sql, _connection))
{
using (OracleDataReader reader = command.ExecuteReader())
{
Mapper.CreateMap<IDataReader, List<T>>();
return Mapper.Map<IDataReader, List<T>>(reader);
}
}
}
}
I'm trying to find out how I would define the code first navigation properties on these two classes to perform something similiar to this query:
SELECT USERID, FIRSTNAME, LASTNAME, COURSEID, NAME
FROM User
LEFT OUTER JOIN Course ON User.USERID = Course.USERID
WHERE COURSEID = 1
So I'm trying to find a list of users together with if they have attended a certain course.
public class User
{
public int UserId {get;set; }
public string FirstName {get;set;}
public string LastName {get;set;}
public virtual ICollection<Course> Courses { get; set; }
}
public class Course
{
public int CourseId { get;set; }
public int UserId { get;set; }
public string Name { get;set; }
public virtual User User {get;set;}
}
If I was to write a query to achieve this
var u = Users.Where(x => x.Courses.Any(x => x.CourseId = 1));
This does a subquery, which is not what I wanted (as people who didnt attend the course would not show).
How would the navigation property be defined?
HasMany(t => t.Courses).WithOptional(t => t.User).HasForeignKey(t => t.UserId);
Check this link:
http://msdn.microsoft.com/en-us/library/vstudio/bb397895.aspx
Left outer joins in LINQ are done via DefaultIfEmpty method.
var u = Users.Select ( x => new {
User = x,
AttendedCourse = x.Courses.Any()
} );
For specific course id,
var u = Users.Select ( x => new {
User = x,
AttendedCourse = x.Courses.Any( c => c.CourseID == 1 )
} );
Sub query is the only way to write related queries, However, EF will choose the best suitable join type and will give you correct results. And EF can manage mostly all kinds of queries without doing joins.