I am using 1 dataset in my ssrs report and querying on phone call entity.I want to show Call From and Call To fields of phone call for that I have to use Lookup function in Call From and LookupSet function in Call To , But after using these expressions, I get multiple rows in the result. The expressions I am using are as follows-
Expression for Call From-
=IIF(Lookup(Fields!ae_partyid.Value,Fields!ae_partyid.Value,Fields!ae_participationtypemaskValue.Value=1,"DataSet1"),Fields!ae_partyid.Value,"")
Expression for Call To-
=IIF(IsNothing(Join(LookupSet(Fields!activityid.Value, Fields!activityid.Value, IIF(Fields!ae_participationtypemaskValue.Value = 2, Fields!ae_partyid.Value, ""), "DataSet1"), ",")),"",Join(LookupSet(Fields!activityid.Value, Fields!activityid.Value, IIF(Fields!ae_participationtypemaskValue.Value = 2, Fields!ae_partyid.Value, ""), "DataSet1"),", ").Trim(",").Trim())
Related
I am using codeigniter and grocerycrud, I want to set a table with grocerycrud in this way:
SELECT * FROM `dashboard`.`medidas_ludlum`
where FK_ludlum='190.26.88.131'
and date>= '2014-03-04 09:40:00'
and date<= '2014-03-05 09:40:00'
and (error_code=1 or audio_status=1);
I tried to do that in this way:
$uno='1';
$crud2 = new grocery_CRUD();
$crud2->set_theme('datatables');
$crud2->where('FK_ludlum',$ludlum_id);
$crud2->where('date>=',$fechainicio);$crud2->where('date<=',$fechafin);
$crud2->where('error_code =',$uno);
$crud2->or_where('audio_status =',$uno);
$crud2->set_table('medidas_ludlum');
$crud2->columns('measurement', 'fecha', 'audio_status', 'high_alarm_status', 'low_alarm_status','over_range_status','monitor_status','error_code');
$crud2->set_language("spanish");
$crud2->unset_add();$crud2->unset_delete();$crud2->unset_edit();$crud2->unset_read();
$data['crud2'] = $crud2->render();
However it's not giving the right results, for example I am getting rows that have a date out of the range, is there a way to get that CRUD set up?
Grocery curd is also using codeigniter's active record so you can write your where() with grouped conditions as below,no need to use or_where() function
$crud2->where('(error_code ='.$uno.' OR audio_status ='.$uno.')',null,FALSE);
or
$crud2->where('(error_code =1 OR audio_status =1)',null,FALSE);
The problem in your query is when you use or_where() function it produces where clause as and error_code=1 or audio_status=1 and using approach that i have provide will give you the where clause as and (error_code=1 or audio_status=1) a grouped condition
API and Functions list
I have a simple table (SQL server and EF6) Myvalues, with columns Id & Value (double)
I'm trying to get the sum of the natural log of all values in this table. My LINQ statement is:
var sum = db.Myvalues.Select(x => Math.Log(x.Value)).Sum();
It compiles fine, but I'm getting a RTE:
LINQ to Entities does not recognize the method 'Double Log(Double)' method, and this method cannot be translated into a store expression.
What am I doing wrong/how can I fix this?
FWIW, I can execute the following SQL query directly against the database which gives me the correct answer:
select exp(sum(LogCol)) from
(select log(Myvalues.Value) as LogCol From Myvalues
) results
LINQ tries to translate Math.Log into a SQL command so it is executed against the DB.
This is not supported.
The first solution (for SQL Server) is to use one of the existing SqlFunctions. More specifically, SqlFunctions.Log.
The other solution is to retrieve all your items from your DB using .ToList(), and execute Math.Log with LINQ to Objects (not LINQ to Entities).
As EF cannot translate Math.Log() you could get your data in memory and execute the function form your client:
var sum = db.Myvalues.ToList().Select(x => Math.Log(x.Value)).Sum();
I have a data table containing multiple columns and one column that stores somewhat complex text patterns - I need to parse the field to determine if a particular sub strings exist in specific positions within the larger string pattern and then if the record should be filtered out as a result.
I can't see a way to perform the parse other than by writing a C# parsing function with String.Split method calls, foreach, etc. But if I try to parse like this:
var myFilteredTable = _db.MyTable.Where(t => t.Column1 == 'Filter1'
&& ParseIsMyItemInColumn2(t) );
I get "has no supported translation to SQL" errors.
The other option I thought of was to build the initial result without the Parse:
var myFilteredTable = _db.MyTable.Where(t => t.Column1 == 'Filter1' );
and iterate through the IQueryable resultset, testing each row with the parse function, to filter out the unwanted rows, but IQueryable does not have Remove function to strip out unwanted rows nor Add function to allow me to build up a new resultset.
So how can I filter in linq when I also need to write a Parse function?
Well the "initial filter in the database then do the rest locally" is easy:
var filtered = _db.MyTable.Where(t => t.Column1 == "Filter1")
.AsEnumerable() // Do the rest locally
.Where(t => ParseIsMyItemInColumn2(t));
AsEnumerable is a simple pass through method, but because the result is typed as IEnumerable<T> rather than IQueryable<T>, the subsequent LINQ operations use the LINQ to Objects methods in Enumerable rather than the ones in Queryable.
Obviously if a lot of items match the first filter but fail the second, that won't be terribly efficient...
Unfortunately, if the "parse function" is not something that can be translated to SQL, you will need to pull the results and use LINQ to Objects:
var myFilteredTable = _db.MyTable.Where(t => t.Column1 == 'Filter1')
.AsEnumerable().Where(ParseIsMyItemInColumn2);
Note that this will stream all of the results into memory, and then perform your parse.
Is there a way to use a LINQ expression to request a Count query from the Netflix oData service in Silverlight 4?
The Netflix documentation shows that you can return counts by appending $count to a request for a collection, but a URL like this:
http://netflix.cloudapp.net/Catalog/Genres/$count
Is not generated from an expression like this:
var count = (from g in catalog.Genres select g).Count();
The above code returns an error saying that the Count method is not supported. Is there a way to do this in LINQ, or do I just need to make WebClient request to get the value?
Count and LongCount are not supported in Silverligth because they require a synchornous execution of the query. Since Silverlight requires all network operations to by asynchronous this is not possible.
You can either issue the HTTP query in question programatically not using DataServiceContext (or related classes), since the $count returns a text representation of the number, parsing the response is not that hard.
Or you can use a bit of a trick. You can use IncludeTotalCount() to add $inlinecount=allpages query option to the query which will include the count in the response. Then to not download all the entities from server, you can use Take(0) which will add $top=0 and thus return empty result set. But the inline count will still contain the right number.
You can access the inline count on the QueryOperationResponse.TotalCount property.
Something like this:
NetflixCatalog ctx = new NetflixCatalog(new Uri("http://netflix.cloudapp.net/Catalog"));
var q = (DataServiceQuery<Genre>)ctx.Genres.IncludeTotalCount().Take(0);
q.BeginExecute((ar) =>
{
QueryOperationResponse<Genre> r = (QueryOperationResponse<Genre>)q.EndExecute(ar);
r.TotalCount.ToString(); // Use the count in whatever way you need
}, null);
It works in LinqPad 4 using C# 4.0
var count = (from g in Genres select g).Count();
count.Dump();
Result: 518
In LinqPad 2 using C# 3.0 the error appears.
Suppose I have a table Person(PersonID, Name, ....). Then I use EF to create a Entity model and then create DomainService based on Ria Service. At client side(sliverlight), I try to create a dynamic linq for filter function. What I did is:
q = EntityQuery<MyData.Person>
q = q.Where(p=> p.Name.Contains(NameVar));
That is fine. Then I have another two tables for phone:
Phone(PhoneID, PhoneNumber, ...)
PersonPhone(PersonID, PhoneID, ...)
Then I want to add filter to match PhoneNumber. How to write the linq query q like?
q = q.Where(p => p.PersonPhone.
Where(ph=>ph.PhoneNumber.Contains(PhoneVar)&& ph.PersonID == p.PersonID).Count()>0);
I can pass the compiliation, but when run the app, I got error:
Query operator 'Count' is not supported
How to resolve this problem?
This sounds like a good scenario for writing a custom query method on the server and invoking that method instead of the default query for Person. RIA Services only supports a subset of LINQ operations on the client, but you can use all LINQ operators on the server.
You need to use the QueryBuilder
Here's a sample
var qb = new QueryBuilder<Person>().Where(p => p.PersonPhone.Where(ph=>ph.PhoneNumber.Contains(PhoneVar)&& ph.PersonID == p.PersonID).Count()>0);
Then you can take qb and apply it to whatever query you like.
query = qb.ApplyTo(query);
By using Func<QueryBuilder<Person>> you can pass around your dynamic filter into common controls and etc. And when you invoke the function you'll get the current values from that ViewModel.