DataSource Controls :: How To Convert Entity Collections To A Dataset
May 19, 2010
I'm having trouble using entities: I still want to use entities on my "DAL" layer, but in "BLL" layer I want to return not a collection of entities but just a Dataset with all the table I got back from Stored Procedure. How can I do that?
The presention layer don't know anything about entities, if I can get just a dataset from "BLL", it will be very easy to work with it as it was before. Only the DAL and BLL layers will be changing.
P.S.
Does entities support stored procedure that is returning more than one table, I mean more than one entity?! If not, This is another BIG problem Microsoft didn't think about.
I must tell you the truth: I am really disappointed about using Entities. There is no logical support for Stored Procedure and too many problems when you want to have N-Tiers. It is like Microsoft have done only half of the work needed so this will be really usefull.
In my project I work with Entity Framework (LINQ to ENTITY). I only have ADO.NET Entity Data Model and a DAL (Data Access Layer). I also get the data due a WCFClientService. I have a gridview that needed to be exported in Excel.
FlexCel is a tool for generating Excel files based on a template. The only thing I see in demo's is that they work with DataSets.
Is there a way to convert the data in my gridview to a virtual DataSet?
I've written the following method to get the data:
I mean, what is the faster way to get as fast as I can more than one table with stored procedure? Is there any study what is faster and why? There is a big problem getting more than one table at once with Entities, so the only way is DataSet. But I was told DataSet work very slow. Is that true?
I'm using EF4 and have created POCO objects. The problem with POCO objects are all the entity graph are ICollection....therefore cannot be serialized.
The problem lies is passing the entity graph to stored procedure....therefore the approach i have take is to convert the entity graph to dataset, convert the dataset to xml and then pass it the stored procedure....this is the only way i could get a clean XML in my stored procedure.
I'm trying to create a generic helper method to convert entity graph to dataset.
I have a SQL which is running good at SQL Server Mgm studio:
"select d.EmployeeID, CONVERT(VARCHAR(10),d.LogTime,111) as Date1, MIN(CONVERT(VARCHAR(8), d.LogTime, 108)) as FirstIn from LogTable d where d.dwStatus=0 group by d.EmployeeID, CONVERT(VARCHAR(10), d.LogTime,111)"
However, When i put it into my code (Entity SQL):
"select d.EmployeeID, CONVERT(VARCHAR(10),d.LogTime,111) as Date1, MIN(CONVERT(VARCHAR(8), d.LogTime, 108)) as FirstIn from IGPSiteEntities.AccessLogSet AS d where d.dwStatus=0 group by d.EmployeeID, CONVERT(VARCHAR(10), d.LogTime,111)"
I got error :
'CONVERT' cannot be resolved into a valid type of function. Near simple identifier, line1, column 200.
LogTime is a DateTime format e.g 05/05/2010 14:12:12
I want to select ONLY the Date (e.g 05/05/2010) and select ONLY the time (e.g 14:12:12) so i use CONVERT function.
I am having a lot of the same issue as this poster did with errors on initializing type.
I am trying to learn linq and am about ready to give up - don't get how this is easier...
I'm trying to do a simple update to product names in the product table based on the manufacturer ID
In order to do this I am looping through each record. I was initally successful with changing all names in the column but when I try to query the data, I continually run into multiple problems.
The following poster has had the same issue I have but his solution isn't working for me.
[URL]
I keep getting the same error on the opening bracket on the select statement in the SelectByManufacturerID function...
Error 1 Cannot initialize type 'DataBaseDataManagement.ProductName' with a collection initializer because it does not implement 'System.Collections.IEnumerable'
Button that does the actual updating...
[Code]....
The function that the button calls to get the query... ERROR
how do i copy required row in dataset to a new dataset. i have bind a xml into a dataset and i need to display say row 3 to 5 only so i do a for loop but i have encounter problem when trying to copy the rows to a new dataset.
do i have to write the xml to datatable and bind it to dataset and from there copy over ?
DataView Dv = new DataView(); Dv = dts.DefaultView; Dv.Sort = "ReportName"; dset = new DataSet(); DataTable datable = Dv.Table; dset.Tables.Add(datable);
I convert dataview to datable and sorting.dataview sorting grid. But I covert dataview to dataset.not sorting in gridview...
I want to do paging the API Membership without using the datacontrols, but I get this error "Unable to cast object of type '<TakeIterator>d__3a`1[System.Char]' to type 'System.Collections.IList'." when I do this,
select * from MyTable select "MonthName"= case when datepart(month,date1) =1 then 'January' when datepart(month,date1) =2 then 'February' end , count(*) as CountByMonth from venkat group by datepart(month,date1)
I used code below to convert a dataset to Excel. One column (MemberID) is varchar data type but after conversion it became number. For example, if MemberID = '012345' will convert to 12345 missing '0'.
I have an XML document that has a collection of objects. Each object has a key/value pair of label and value. I am trying to convert this into a DataSet, but when I do ds.ReadXml(xmlFile), then it creates two columns: label and value.
What I would like is to have a column for each "label" and the value to be part of the row. here is my sample of the XML:
[code]....
How would I convert this to a DataSet so that I can load it into a gridview with the columns: Name, Email, Website, Phone, Place of Birth, Misc, Comments, and Agree to Terms?
I am developing a website using Visual Studio 2010, SQL server 2008 and WCF. Already i have developed DAL (Data Access Layer), for some of pages i want to use WCF services and Silverlight, I am new for WCF and i understand that all should be done in List<> for Silverlight and WCF. But all my methods in DAL will return the records in DATA SET format, So my ultimate aim is to convert the DATA SET into List. I browsed in internet and got many explanation like serialization , IEnumarable and so.... but i have 1000 of methods in my DAL, so for the each method i do not want DATA SET to LIST convertion. So i am thinking of having one common class the responsibility of comman class will be get the dataset and return the List [Convert DATA SET to LIST ] For example(Just Psedo explanation for undertanding, Ignore the Syntax error )
Public List< > DsTOLi(dsRecord) { // Here we will convert DATA SET to LIST return liRecord; }
I set up Entity Framework for my Table and Stored Procedure to return data. Created a Domain Class as well.
In Domain Class, I am returning Objects as collection.
On .Aspnet page when I drop a Control(Combo,Dropdown) I can set up the source for the controls visually if the source is table.
However, In domain class I have stored precedure object that return collection of data And I cant not set up visually from Designer, I am only available to write code behind. is it possibble that i can set up from desingner.
