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Questions tagged [entities]

Entity-relationship model (ER model for short) is an abstract and conceptual representation of data.

In software engineering, an entity-relationship model (ER model for short) is an abstract and conceptual representation of data. Entity-relationship modeling is a database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion. Diagrams created by this process are called entity-relationship diagrams or ER diagrams.

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Can you add a Where() to an IQueryable when the field is not in the selected output

Suppose I have a 2 table join in a function that returns an IQueryable, but the output is a named type that is neither of the two tables: var qry = from p in Persons join h in Hobbies on p.PersonId equals h.PersonId select new…
Randy Magruder
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Domain entities design

which approach is better and more correct. class Project int Id string Name int CategoryId OR class Project int Id, string Name Category CategoryId
hashtag
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Should I use separate tables for the same columns in my database?

If I have 3 entities: Story Blog Article And let's say that these entities have the same attributes or columns. Should I combine these 3 in 1 entity? And imagine that each row (1 row) contains a lot of data. Is it better in terms of performance?…
user3125591
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Core Data - Multiple entities

Fellows! I have an app using Core Data where I created one Entity (let's call "Entity1") and one attribute. I implemented it and the app was running perfectly. It was reading, writing and deleting datas. So, I created a second entity ("Entity2") and…
IamInTrouble
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MVC layered architecture using entities convertible to 'System.IDisposable'?

My code has an error, I do not know what is causing it namespace cms.data.System { public class MenuProccess { public static List GetMenus(Nullable LanguageID){ using (cmsEntities db = new cmsEntities)…
Oğuzhan Sari
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html tags restriction

test

works perfect, but when I try < h1>test< /h1> it doesn't work, I cannot have a character placed right next to the less than < symbol, is there anyway to execute the html code with just a space next to the less than symbol? Example: <…
Alex Xwalewx
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