So, I am trying to update my data project to use dot net core. I am slowly getting through all the errors. I am having trouble with this one though. I need to make an SqlQuery that returns a list, but as far as I am aware dot net core doesn't support that yet.
Here is the code
List<DateTime> result = this.Database.SqlQuery<DateTime>(#"SELECT c.DateId FROM Schedule.Calendar c
WHERE c.DateId > #startDate AND c.DateId < #endDate AND c.IsWorkDay = 0",
new SqlParameter("#startDate", startDate), new SqlParameter("#endDate", endDate)).ToList();
I have a few more that are kinda like this, but I can't figure those out either. I am getting an error on the SqlQuery
It says thatDatabaseFacade does not contain a definition for SqlQuery. How would I go about updating this code?
I understand that you're trying to use Raw SQL but my preference would be to approach this scenario using Linq as:
List<DateTime> GetDateTimeResult(DateTime startDate, DateTime endDate, int isWorkDay)
{
using (var db = new YourScheduleDatabaseContext())
{
List<DateTime> result = db.Calendar
.Where(c => c.DateId > startDate)
.Where(c => c.DateId < endDate)
.Where(c => c.IsWorkDay.Equals(isWorkDay))
.Select(c => new DateTime(c.DateId)).ToList();
return result;
}
}
I might have misunderstood your context name and table names but hope you get the idea and happy to help further.
I ended up using the following code:
List<MyDateTime> result = this.Set<MyDateTime>().FromSql(#"SELECT Schedule.Workday(#startDate, #days)",
new SqlParameter("#startDate", startDate), new SqlParameter("#days", days)).ToList();
List<DateTime> finalResult = new List<DateTime>();
foreach(MyDateTime myDate in result)
{
finalResult.Add(myDate.DateTime);
}
This way I don't have to have a using or a certain context. I just created class with DateTime property to use as MyDateTime.
Related
I have a date field and 2 time fields(Start Time and End Time). I have to get Data from the date and entered in that date field and between Start and end times.
I am using Linq query.
result = result.Where(x => x.CreatedDate.ToLocalTime() > search.StartTime &&
x.CreatedDate.ToLocalTime() < search.EndTime);
I am using this but I am getting the following error.
LINQ to Entities does not recognize the method 'System.DateTime ToLocalTime()' method, and this method cannot be translated into a store expression
Please Help.
You can't use ToLocalTime() for Linq to Entities. Because it can't be translated to SQL. There is no equivalent to apply it.
So, why don't you convert your startTime and endTime by considering required time zone which is stored in the database. Opposite conversion should be like that;
//I use utc time to provide example.
//Convert your dates with required timezones which is stored in the database
var startTime = search.StartTime.ToUtcDateTime();
var endTime = search.EndTime.ToUtcDateTime();
result = result.Where(x => x.CreatedDate > startTime &&
x.CreatedDate < endTime);
As Panagiotis Kanavos pointed out there may be no equivalent argument. When you do have the correct type though you are essentially doing a conversion of one DateTime to another. Both the predicate values and the set should have their values preferably stored in the same TimeZone. Here is a simple console example to show what I mean.
public class TestData
{
public DateTime Dt { get; set; }
public TestData(DateTime dt)
{
Dt = dt;
}
public override string ToString() => Dt.ToString();
}
static void Main(string[] args)
{
var dt = new DateTime(2018, 1, 11);
var s = dt;
var e = dt.AddHours(3);
var dts = new List<TestData>();
for (int i = 0; i < 10; i++)
{
dts.Add(new TestData(dt.AddHours(i)));
}
Console.WriteLine("Dates as are");
dts.ForEach(Console.WriteLine);
Console.WriteLine(Environment.NewLine);
Console.WriteLine("Dates to local time are");
dts.ForEach(x => Console.WriteLine(x.Dt.ToLocalTime()));
Console.WriteLine(Environment.NewLine);
Console.WriteLine("searches are");
Console.WriteLine(s);
Console.WriteLine(e);
Console.WriteLine(Environment.NewLine);
Console.WriteLine("searches to local time are");
Console.WriteLine(s.ToLocalTime());
Console.WriteLine(e.ToLocalTime());
Console.WriteLine(Environment.NewLine);
Console.WriteLine("Weird results as one set is cast to local and other is not. Plus the cast is now performed on presentation");
dts.Where(x => x.Dt.ToLocalTime() >= s && x.Dt.ToLocalTime() <= e).ToList().ForEach(Console.WriteLine);
Console.WriteLine(Environment.NewLine);
Console.WriteLine("expected results as both are uniform");
dts.Where(x => x.Dt >= s && x.Dt <= e).ToList().ForEach(Console.WriteLine);
Console.ReadLine();
}
Since different posters on SO are in different timezone the second result set will vary. But essentially I am in PST in the US so I see times for the second set eight hours prior to my first. You generally in .NET perform operations of storage to be UTC if your application is going to be worldwide or even country wide. Then you just deal with DateTimes and would only do a conversion on the client end for presentation to a potential end user. But most of the time not in the logic for predicates.
I am trying to convert a Linq result in to a datatable
I have a linq that is created from a dataset of many tables. It returns results, but I need to get the results in to a new datatable.
Examples I have seen say I sould be able to use .CopyToDataTable But for some reason this doesn't work?
I have noticed that I can to .ToArray perhaps I can then turn the array in to a datatable? Seems line an unnecessary step?
Here is my query: (it works)
Dim R2 = From Inq In DS.Tables!CNLocalInquiry.AsEnumerable()
Join Cust In DS.Tables!CustomerID.AsEnumerable() On Inq.Field(Of Integer)("CNLocalInquiry_Id") Equals Cust.Field(Of Integer)("CNLocalInquiry_Id")
Select New With {.date = Inq.Field(Of String)("date"),
.CName = Cust.Field(Of String)("CustomerNumber"),
.Name = Cust.Field(Of String)("name")}
Dim MemberInq as new datatable
MemberInq = R2.CopyToDataTable() <-- this doesn't work
This is what my query returns:
(this is the easy to code way... this will not be performant for large datasets)
public static class ToolsEx
{
public static DataTable ToDataTable<T>(this IEnumerable<T> items)
{
var t = typeof(T);
var dt = new DataTable(t.Name);
var props = t.GetProperties()
.Select(p => new { N = p.Name, Getter = p.GetGetMethod() })
.Where(p => p.Getter != null)
.ToList();
props.ForEach(p => dt.Columns.Add(p.N));
foreach (var item in items)
dt.Rows.Add(props.Select(p => p.Getter.Invoke(item, null)).ToArray());
return dt;
}
}
I've saved this as an extension method and it's always worked perfectly:
https://msdn.microsoft.com/en-us/library/bb669096.aspx
Examples here:
https://msdn.microsoft.com/en-us/library/bb386921.aspx
Hope that does the trick!
I have the following query:
var list = repositoy.Query<MyClass>.Select(domain => new MyDto()
{
Id = domain.Id,
StringComma = string.Join(",", domain.MyList.Select(y => y.Name))
});
That works great:
list.ToList();
But if I try to get the Count I got an exception:
list.Count();
Exception
NHibernate.Hql.Ast.ANTLR.QuerySyntaxException
A recognition error occurred. [.Count[MyDto](.Select[MyClass,MyDto](NHibernate.Linq.NhQueryable`1[MyClass], Quote((domain, ) => (new MyDto()domain.Iddomain.Name.Join(p1, .Select[MyListClass,System.String](domain.MyList, (y, ) => (y.Name), ), ))), ), )]
Any idea how to fix that without using ToList ?
The point is, that we should NOT call Count() over projection. So this will work
var query = repositoy.Query<MyClass>;
var list = query.Select(domain => new MyDto()
{
Id = domain.Id,
StringComma = string.Join(",", domain.MyList.Select(y => y.Name))
});
var count = query.Count();
When we use ICriteria query, the proper syntax would be
var criteria = ... // criteria, with WHERE, SELECT, ORDER BY...
// HERE cleaned up, just to contain WHERE clause
var totalCountCriteria = CriteriaTransformer.TransformToRowCount(criteria);
So, for Count - use the most simple query, i.e. containing the same JOINs and WHERE part
If you really don't need the results, but only the count, then you shouldn't even bother writing the .Select() clause. Radim's answer as posted is a good way to both get the results and the count, but if your database supports it, use future queries to execute both in the same roundtrip to the database:
var query = repository.Query<MyClass>;
var list = query.Select(domain => new MyDto()
{
Id = domain.Id,
StringComma = string.Join(",", domain.MyList.Select(y => y.Name))
}).ToFuture();
var countFuture = query.Count().ToFutureValue();
int actualCount = countFuture.Value; //queries are actually executed here
Note that there in NH prior to 3.3.3, this would still execute two round-trips (see https://nhibernate.jira.com/browse/NH-3184), but it would work, and if you ever upgrade NH, you get a (minor) performance boost.
I want to send just date to a stored procedure and I wrote this C# code:
string[] pr = { "/" };
string[] s = txtStartDate.Text.Split(pr, StringSplitOptions.None);
term.Start_date = new DateTime(Convert.ToInt32(s[0]), Convert.ToInt32(s[1]), Convert.ToInt32(s[2])).Date;
s = txtEndDate.Text.Split(pr, StringSplitOptions.None);
term.End_date = new DateTime(Convert.ToInt32(s[0]),Convert.ToInt32(s[1]),Convert.ToInt32(s[2])).Date;
and I send it to the stored procedure like this:
public bool AddNewTerm(Term term)
{
SqlParameter[] parameters = new SqlParameter[]
{
new SqlParameter ("#termName",term.TermName),
new SqlParameter ("#start_date",term.Start_date),
new SqlParameter ("#end_date",term.End_date)
};
return SqlDBHelper.ExecuteNonQuery("AddNewTerm", CommandType.StoredProcedure, parameters);
}
but when it goes to the stored procedure say this:
SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.
I see other topic but they cant help me
This is the stored procedure code:
ALTER PROCEDURE dbo.AddNewTerm
(
#termName varchar(50),
#start_date date,
#end_date date
)
AS
insert into term(termName, start_date, end_date)
values(#termName, #start_date, #end_date)
RETURN
Where is the problem?
I find my answer by changing my way
I used PersianCalendar Class and store it varchar.
The error message talks about a lower limit of 1/1/1753, so, supposing that you have parsed correctly your inputs (30/6/1390) the message seems clearly indicate that the two column start_date and end_dateare of type datetimethat has a lower limit of 1/1/1753.
So, to store a date with year less than 1753 you need a datetime2 or date column that have a lower limit of 1/1/0001
Here a quick reference for the two datatypes
There is another problem in your code. You add the parameters to the array without specyfing their SqlDbType and in this way the Date are added as DateTime parameters that of course cannot accept a value below 1/1/1753. A workaround for your specific code could be.
public bool AddNewTerm(Term term)
{
List<SqlParameter> parameters = new List<SqlParameter>()
{
new SqlParameter("#termName",SqlDBType.VarChar, 50) {Value = term.TermName},
new SqlParameter("#start_date",SqlDBType.DateTime2, 0) {Value = term.Start_Date},
new SqlParameter("#end_date",SqlDBType.DateTime2, 0) {Value = term.End_Date},
};
return SqlDBHelper.ExecuteNonQuery("AddNewTerm", CommandType.StoredProcedure, parameters.ToArray());
}
I have a linq object and I want to write the query using linq.
please help me.
INPUT:
var tags = (from row in tempChildData.AsEnumerable()
join tagOrder in tupleInfoDataset.Tables["TagHierarchy"].AsEnumerable() on row.Field<Int64>("TAGID") equals tagOrder.Field<Int64>("TAGID")
join tagName in tupleInfoDataset.Tables["SequenceChoiceList"].AsEnumerable() on tagOrder.Field<Int64>("PARENTTAGID") equals tagName.Field<Int64>("TAGID")
join facet in tupleInfoDataset.Tables["FacetType"].AsEnumerable() on tagName.Field<string>("Tag_Name") equals facet.Field<string>("Facetname")
join tagIdInfo in schDataTogetTagid.AsEnumerable() on row.Field<string>("refTagName").Contains(":") ? row.Field<string>("refTagName").Split(':').Last():row.Field<string>("refTagName") equals tagIdInfo.Field<string>("TAGNAME")
where ( childList.Contains(row.Field<Int64>("TAGID")) && facet.Field<string>("FacetType").ToLower().Equals("ctype"))
select new
{
Tagid = row.Field<Int64>("TAGID"),
TagIdToInsert=tagIdInfo.Field<Int64>("TAGID"),
MaxOccur = row.Field<string>("Maxoccurs"),
MinOccur =Convert.ToInt32(Convert.ToString(row.Field<string>("Minoccur"))),
ParentTagId=tagOrder.Field<Int64>("PARENTTAGID"),
Order=tagOrder.Field<Int64>("TAG_ORDER"),
ParentTagname = tagName.Field<string>("Tag_Name"),
FacetId=facet.Field<Int64>("FacetID")
}).ToList();
var parentTagID = (from tagIdInfo in tupleInfoDataset.Tables["Tuple"].AsEnumerable()
where tagIdInfo.Field<Int64>("TAGID").Equals(key.Key)
select tagIdInfo.Field<Int64>("ConceptID")).ToList();
long parentID =Convert.ToInt64(parentTagID[0]);
Now i want the query out of the above code as:
INSERT INTO TUPLE_MAP (TagId,ParentTagId,ParentTagname,MinOccur,MaxOccur,Order)
VALUES (TagIdToInsert,ParentTagId,ParentTagname,MinOccur,MaxOccur,Order)
Please help me I don't know how to write SQL queries using linq
Maybe something like this:
using(var db=new DataContext("YourConnectionStringHERE"))
{
db.TUPLE_MAP.InsertAllOnSubmit(tags.Select (t =>
new TUPLE_MAP()
{
TagId=t.TagIdToInsert,
ParentTagId=t.ParentTagId,
ParentTagname=t.ParentTagname,
MinOccur=t.MinOccur,
MaxOccur=t.MaxOccur,
Order=t.Order
}));
db.SubmitChanges();
}
Or if you want to use the parentID then something like this:
using(var db=new DataContext("YourConnectionStringHERE"))
{
db.TUPLE_MAP.InsertAllOnSubmit(tags.Select (t =>
new TUPLE_MAP()
{
TagId=t.TagIdToInsert,
ParentTagId=parentID,
ParentTagname=t.ParentTagname,
MinOccur=t.MinOccur,
MaxOccur=t.MaxOccur,
Order=t.Order
}));
db.SubmitChanges();
}
where db is your linq data context
Useful references:
How to: Insert Rows Into the Database (LINQ to SQL)
EDIT
So if you are using the Compact database 3.5 then many something like this:
using (var conn =new SqlCeConnection("Data Source = test.sdf; Password ='pass'"))
{
foreach (var tag in tags)
{
using(var cmd = conn.CreateCommand())
{
cmd.CommandText = #"INSERT INTO TUPLE_MAP (TagId,ParentTagId,ParentTagname,MinOccur,MaxOccur,Order)
VALUES (#TagIdToInsert,#ParentTagId,#ParentTagname,#MinOccur,#MaxOccur,#Order)";
cmd.Parameters.AddWithValue("#TagIdToInsert", tag.TagIdToInsert);
cmd.Parameters.AddWithValue("#ParentTagId", tag.ParentTagId);
cmd.Parameters.AddWithValue("#ParentTagname", tag.ParentTagname);
cmd.Parameters.AddWithValue("#MinOccur", tag.MinOccur);
cmd.Parameters.AddWithValue("#MaxOccur", tag.MaxOccur);
cmd.Parameters.AddWithValue("#Order", tag.Order);
cmd.ExecuteNonQuery();
}
}
}
Useful references:
Why can't I insert a record into my SQL Compact 3.5 database?
SqlCeCommand.Parameters Property
SqlCeCommand Class
SqlParameterCollection.AddWithValue Method
Use linq Pad or sql profiler to see the generated SQL.
You can also use visual studio for that purpose. In the debug mode,hold cursor on the variable "tags", you will be able to see the SQL.
I am assuming you are using Linq to SQL, if you are doing so you would have entity called Tuple_map in you xxxDataContext. Then you would just have to create object of that entity something like this....
using (XXXDataContext context = new XXXDataContext())
{
Tuple_map obj = new Tuple_map();
//Populate obj properties like obj.tabid = from objects you got it from above query
context.Tuple_map.InsertOnSubmit(obj);
context.SubmitChanges();
}