Objective: Use the model to show total sales of an id and total sales difference for multiple periods.
Issue: Using MVC4 I have a model for a report that displays total sales. I know I can add a variable for each additional period, but I have many periods that I'd like to use to compare and show a difference. How can this be done avoiding needless repetition?
public class Report
{
public long ID { get; set }
public long TotalSales { get; set}
public long TotalSales2 { get; set}
public long TotalSalesDiff { get; set}
}
Thank you in advance for any suggestions and/or comments
If I understood your scenario you have two option either create a dictionary that can create properties or use Dynamic object class
For dictionary
public class DictionaryProperty
{
Dictionary<string, object> Yourproperties = new Dictionary<string, object>( );
public object this[ string name ]
{
get
{
if ( Yourproperties.ContainsKey( name ) )
{
return Yourproperties[ name ];
}
return null;
}
set
{
Yourproperties[ name ] = value;
}
}
}
}
And for the Dynamic object please refer following link
http://msdn.microsoft.com/en-us/library/system.dynamic.dynamicobject.aspx
cheers
I don’t have enough points to add a comments that’s the why I make this is an answer.
Related
I have an index.chtml set up with about 10 ActionLinks. Those actionLinks trigger different ActionResult functions within the controller since each of them essentially perform unique queries on a data model.
I also have an entities object named db which has all the data. Instead of just displaying all the data, I want to perform complex filtering on the entities object to find where certain properties of records are null or where a property is greater than some input then returns a view of all columns on only those records that were filtered.
Find nulls:
public class printJobsController : Controller {
private PrintJobsEntities db = new PrintJobsEntities
public ActionResult IncompleteJobs {
//get jobs where processDate is null
...
}
}
Find where count is greater than 10:
public class printJobsController : Controller {
private PrintJobsEntities db = new PrintJobsEntities
public ActionResult JobsGreaterThan(int limit) {
//group by printerName and find counts greater than limit
...
}
}
How do I go about doing this?
Seems you are trying to populate the View with filtered data as per your request parameter in controller action.
You could follow the below steps to achieve what you are trying to:
Your imaginary Data Model
public class PrinterJob
{
[Key]
public int PrinterId { get; set; }
public string PrinterName { get; set; }
public int PrintedBy { get; set; }
public int TotalPrint { get; set; }
}
Sample Data In Database:
Controller Action:
public ActionResult <PrinterJob> JobsGreaterThan(int limit) {
var printCountByGroup =
(from objPrint in _context.PrinterJobs group objPrint by new {
objPrint.PrinterName, objPrint.PrintedBy, objPrint.TotalPrint
}
into grp where grp.Sum(p => p.TotalPrint) > limit
select new {
PrinterName = grp.Key.PrinterName, PrintedBy = grp.Key.PrintedBy,
TotalPrint = grp.Key.TotalPrint
});
return View(printCountByGroup);
}
Output After Applying Filter:
Note: Here I am trying to filter printer information which printed more then 30 printing jobs.
Hope it would help you to achieve your goal. If you still have any problem feel free to let me know.
I'm using NHibernate 3.33 and QueryOver with Postgre 9.2.
I've got two entities:
public class User {
public virtual string Name { get; set; }
public virtual IList<Reports> Reports { get; set; }
}
and
public class Report {
public virtual string Type { get; set; }
public virtual DateTime ReportDate { get; set; }
public virtual User Author { get; set; }
}
with association - one-to-many (I didn't append additional fields to entities like Id or Name to snippets above). Some report's types are avaliable - month, day.
My goal is to get summary for user - find out whether user has day-report and month-report for current day.
Note: month-report's ReportDate looks like first day of month. Also I want to get it as one row (if it was an SQL) to transform to dto:
public class UserSummaryDto {
public bool HasDayReport { get; set; }
public bool HasMonthReport { get; set; }
}
To achieve my goal I've tried following:
Report dayReport = null;
Report monthReport = null;
var currentDay; // some value of current day
var firstDay; // some value of first day of month
var report = session.QueryOver<User>
.Left.JoinAlias(u => u.Reports, () => dayReport, r => r.ReportDate == currentDay)
.Left.JoinAlias(u => u.Reports, () => monthReport, r => r.ReportDate == firstDat)
.SelectList(
// some logic to check whether user has reports
.TransformUsing(Transformers.AliasToBean<UserSummaryDto>())
.List<UserSummaryDto>()
And I've got error:
'duplicate association path:Reports'.
Is it possible to avoid this problem or it's a limitation of HNibernate?
To answer your question:
...Is it possible to avoid this problem or it's a limitation of HNibernate?
Have to say NO.
For more information see similar Q & A: Rename NHibernate criteria
We are not querying the DB, not using SQL (which does allow to do a lot). Here we work with "mapped" domain model, and that could bring some limitations - as the one discussed here...
If that could help, the workaround is to map such property twice and use the WHERE clause: 6.2. Mapping a Collection
where="" (optional) specify an arbitrary SQL WHERE condition to be used when retrieving or removing the collection (useful if the collection should contain only a subset of the available data)
Imagine a database table that looks like this:
create table [dbo].[user]
(
id int IDENTITY(1,1),
username varchar(50) NOT NULL,
firstname varchar(20) NOT NULL,
lastname varchar(30) NOT NULL,
currentid int NULL,
processedby varchar(50) NOT NULL,
processeddate varchar(50) NOT NULL
processedaction varchar(50) NOT NULL
)
What I want to do is to setup NHibernate to load it into my user object, but I only want the current version of the object "user" to be brought back. I know how to do a SQL select to do this on my own, and I feel as if there's something in nHibernate with the usage of triggers and event listeners, but can anyone tell me how to implement the nHibernate repository so I can:
{Repository}.GetCurrent(id) <- pass it any of the ids that are assigned to any of the historical or the current record, and get back the current object.
{Repository}.Save(user) <- I want to always insert the changes to a new row, and then update the old versions to link back to the new id.
Edit
So, there's some confusion here, and maybe I explained it wrong... What I'm trying to do is this, in regards to always getting the current record back...
Select uc.*
FROM User uo
JOIN User uc on uo.currentid=uc.id
WHERE uo.id==:id
But, I don't want to expose "CurrentID" to my object model, since it has no bearing on the rest of the system, IMHO. In the above SQL statement, uo is considered the "original" object set, and uc is considered the current object in the system.
Edit #2:
Looking at this as a possible solution.
http://ayende.com/blog/4196/append-only-models-with-nhibernate
I'm honestly being pigheaded, as I'm thinking about this backward. In this way of running a database, the autoincrementing field should be the version field, and the "id" field should be whatever the autoincrementer's value has at the time of the initial insert.
Answer:
I don't want to take #Firo's fury, and I'm not going to remove it from him, as he took me down the right path... what I wound up with was:
Created a base generic class with two types given
a. type of the object's "ID"
b. type of the object itself.
instantiate all classes.
create a generic interface IRepository class with a type of the object to store/retrieve.
create an abstract generic class with a type of the object to store/retrieve.
create a concrete implementation class for each type to store/retrieve.
inside of the create/update, the procedure looks like:
Type Commit(Type item)
{
var clone = item.DeepClone();
_Session.Evict(item);
clone.Id = 0;
clone.ProcessedDate = DateTime.Now;
if (clone.Action.HasValue)
{
if (clone.Action == ProcessedAction.Create)
clone.Action = ProcessedAction.Update;
}
else
{
clone.Action = ProcessedAction.Create;
}
clone.ProcessedBy = UserRepos.Where(u => u.Username == System.Threading.Thread.CurrentPrincipal.Identity.Name).First().Current;
var savedItem = (_Session.Merge(clone) as Type);
_Session.CreateQuery("UPDATE Type SET CurrentID = :newID where ID=:newID OR CurrentID=:oldID")
.SetParameter("newID", savedItem.Id)
.SetParameter("oldID", item.Id)
.ExecuteUpdate();
return savedItem;
}
In the delete method, we simply update the {object}.Action = ProcessedAction.Delete
I wanted to do this another way, but realizing we need to eventually do historical comparisons, we weren't able to ask nHibernate to filter the deleted objects, as the users will want to see that. We'll create a business facade to take care of the deleted records.
Again, much thanks to #Firo for his help with this.
So, with all that, I can finally do this:
var result = {Repository}.Where(obj => obj.Id == {objectID from caller}).FirstOrDefault();
if (result != null)
{
return result.Current;
}
else
{
return null;
}
and always get my current object back for any requesting ID. Hope it helps someone that is in my situation.
in mapping if you use FluentNHibernate
public UserMap : ClassMap<User>
{
public UserMap()
{
Where("id = currentid"); // always bring back the most recent
}
}
// in Userrepository
public void Update(User user)
{
var clone = user.Clone();
session.Evict(user); // to prevent flushing the changes
var newId = session.Save(clone);
session.CreateQuery("UPDATE User u SET u.currentid = :current") // <-- hql
.SetParameter("current", newId)
.ExecuteUpdate();
}
objectgraphs are a lot trickier with this simple code. I would then do one of the following:
use NHibernate.Envers to store auditing information for me
explicitly creating new entities in BL code
i once saw an append-only-model doing something like the following
// UserBase is there to ensure that all others referencing the User doesnt have to update because user properties changed
class UserBase
{
public virtual int Id { get; set; }
public virtual ICollection<PersonDetails> AllDetails { get; private set; }
public virtual PersonDetails CurrentDetails
{
get { return _currentDetauils; }
set { _currentDetauils = value; AllDetails.Add(value); }
}
// same as above
public virtual ICollection<ConfigDetails> AllConfigs { get; set; }
}
class Order
{
public virtual int Id { get; set; }
public virtual UserBase User { get; set; }
public virtual IList<OrderDetail> AllDetails { get; private set; }
public virtual IList<OrderDetail> ActiveDetails { get; private set; }
public virtual void Add(OrderDetail detail)
{
AllDetails.Add(detail);
ActiveDetails.Add(detail);
}
public virtual void Delete(OrderDetail detail)
{
detail.Active = false;
ActiveDetails.Remove(detail);
}
}
class OrderDetail
{
public virtual int Id { get; set; }
public virtual Order Parent { get; set; }
public virtual bool Active { get; set; }
}
class OrderMap : ClassMap<Order>
{
public OrderMap()
{
HasMany(o => o.AllDetails);
HasMany(o => o.ActiveDetails).Where("active=1");
}
}
// somewhere
public void UpdateTaxCharge(OrderDetail detail, TaxCharge charge)
{
var clone = detail.Clone();
clone.TaxCharge = charge;
detail.Order.Delete(detail);
detail.Order.Add(clone);
}
You can tell NHibernate what exactly SQL it should generate when persisting and loading an entity. For example you can tell NHibernate to use a stored procedure instead of a plain SQL statement. If this is an option for you I can farther elaborate my answer.
I have following problem:
We have multi-value fields in DB like ProductLineIdList which stores every allowed productLines separated by comma (for example "2,13,27,33"). I would like to map this field to IList (list with 4 entities). Is it possible to do that? Thx
How about saving the productLines as a string, and then use a non mapped property to return the list of product lines? I suspect you'd have a hard time pulling that off with pure NHibernate.
public class Product
{
// protected so we can't see this
protected virtual string productLines { get; set; }
// instruct NHibernate to ignore this property!
public IList<string> ProductLines
{
get
{
if (!string.IsNullOrEmpty(productLines))
{
return productLines.Split(',').ToList();
}
else
{
return new List<string>();
}
}
}
}
I'm a fluent nhibernate newbie and I'm struggling mapping a hierarchy of polymorhophic objects. I've produced the following Model that recreates the essence of what I'm doing in my real application.
I have a ProductList and several specialised type of products;
public class MyProductList
{
public virtual int Id { get; set; }
public virtual string Name {get;set;}
public virtual IList<Product> Products { get; set; }
public MyProductList()
{
Products = new List<Product>();
}
}
public class Product
{
public virtual int Id { get; set; }
public virtual string ProductDescription {get;set;}
}
public class SizedProduct : Product
{
public virtual decimal Size {get;set;}
}
public class BundleProduct : Product
{
public virtual Product BundleItem1 {get;set;}
public virtual Product BundleItem2 {get;set;}
}
Note that I have a specialised type of Product called BundleProduct that has two products attached.
I can add any of the specialised types of product to MyProductList and a bundle Product can be made up of any of the specialised types of product too.
Here is the fluent nhibernate mapping that I'm using;
public class MyListMap : ClassMap<MyList>
{
public MyListMap()
{
Id(ml => ml.Id);
Map(ml => ml.Name);
HasManyToMany(ml => ml.Products).Cascade.All();
}
}
public class ProductMap : ClassMap<Product>
{
public ProductMap()
{
Id(prod => prod.Id);
Map(prod => prod.ProductDescription);
}
}
public class SizedProductMap : SubclassMap<SizedProduct>
{
public SizedProductMap()
{
Map(sp => sp.Size);
}
}
public class BundleProductMap : SubclassMap<BundleProduct>
{
public BundleProductMap()
{
References(bp => bp.BundleItem1).Cascade.All();
References(bp => bp.BundleItem2).Cascade.All();
}
}
I haven't configured have any reverse mappings, so a product doesn't know which Lists it belongs to or which bundles it is part of.
Next I add some products to my list;
MyList ml = new MyList() { Name = "Example" };
ml.Products.Add(new Product() { ProductDescription = "PSU" });
ml.Products.Add(new SizedProduct() { ProductDescription = "Extension Cable", Size = 2.0M });
ml.Products.Add(new BundleProduct()
{
ProductDescription = "Fan & Cable",
BundleItem1 = new Product() { ProductDescription = "Fan Power Cable" },
BundleItem2 = new SizedProduct() { ProductDescription = "80mm Fan", Size = 80M }
});
When I persist my list to the database and reload it, the list itself contains the items I expect ie MyList[0] has a type of Product, MyList[1] has a type of SizedProduct, and MyList[2] has a type of BundleProduct - great!
If I navigate to the BundleProduct, I'm not able to see the types of Product attached to the BundleItem1 or BundleItem2 instead they are always proxies to the Product - in this example BundleItem2 should be a SizedProduct.
Is there anything I can do to resove this either in my model or the mapping?
Thanks in advance for your help.
As it stands, the BundleItem1 and BundleItem2 properties will always have a Product proxy because NH creates your proxies without touching the database, so it doesn't know if they are Products or some derived type. But when you call a method on your bundle items, NH should hit the DB and load the correct record, and you should get polymorphic behavior.
You could test this out. Add an override of ToString to your SizedProduct:
public override string ToString()
{
return "I'm a sized product!";
}
Then load your BundleProduct and do this:
Debug.WriteLine(bp.BundleItem1.ToString());
Debug.WriteLine(bp.BundleItem2.ToString());
You should find that the second call prints out "I'm a sized product!", and this will demonstrate that you have working polymorphism.
Assuming this all worked as I've described, its time to tackle the real question: what exactly do you want to do? Maybe you could provide some code that doesn't actually work as you would like it to.