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Returning a distinct result set using IRepository in SalesLogix

Using IRepository in the SalesLogix web client can allow querying the SalesLogix entity model directly, similar to how you used to query the database directly using T-SQL queries.  Ryan has already created a great post here about this, and I expanded on that here.  Today I want to talk about one more functionality of the IRepository, that is how to use Projection to return a distinct list of records from your query.

Lets take a look at how to return a distinct list of Families in the Product table;  The first step is to build your normal query using IRepository:

Sage.Platform.RepositoryHelper<Sage.Entity.Interfaces.IProduct>  repository = Sage.Platform.EntityFactory.GetRepositoryHelper<Sage.Entity.Interfaces.IProduct>();
Sage.Platform.Repository.ICriteria criteria = repository.CreateCriteria();
criteria.Add(repository.EF.IsNotNull("Family"));
criteria.AddOrder(repository.EF.Asc("Family"));

 This established what records you will be returning.  In my case I just added a restriction to only return products with a Family, and then I ordered the result by Family in Ascending order.  Now that we have our query we can then add Projection to it:

criteria.SetProjection(repository.PF.Distinct(repository.PF.Property("Family")));

 Finally we return our distinct list:

System.Collections.IList products = criteria.List();

 With that returned we can then do something with it like bind it to a combo box:

cboFamily.DataSource = products;
cboFamily.DataBind();

Lets look at it all together:

System.Collections.Generic.IList<Sage.SalesLogix.PickLists.PickList>  picklists = Sage.SalesLogix.PickLists.PickList.GetPickListItemsByName("Product Family", true);
Sage.Platform.RepositoryHelper<Sage.Entity.Interfaces.IProduct> repository = Sage.Platform.EntityFactory.GetRepositoryHelper<Sage.Entity.Interfaces.IProduct>();

Sage.Platform.Repository.ICriteria criteria = repository.CreateCriteria();
criteria.Add(repository.EF.IsNotNull("Family"));
criteria.AddOrder(repository.EF.Asc("Family"));

criteria.SetProjection(repository.PF.Distinct(repository.PF.Property("Family")));

System.Collections.IList products = criteria.List();

cboFamily.DataSource = products;
cboFamily.DataBind();

One last thing to note.  If you want to return a distinct result on more than one field you can change this:

criteria.SetProjection(repository.PF.Distinct(repository.PF.Property("Family")));

To this:

criteria.SetProjection(repository.PF.Distinct(repository.PF.ProjectionList()
.Add(repository.PF.Property("Family"))
.Add(repository.PF.Property("Product"))));
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About Kris Halsrud

   Kris Halsrud is a Senior Analyst / Developer for Customer FX Corporation.


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April 28, 2010 2:27 PM

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