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What is Weak Entity set?
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Posted Date :
October 23, 2008
An entity set may not have sufficient attributes to form a primary key, and its primary key compromises of its partial key and primary key of its parent entity, then it is said to be Weak Entity set.
You can also find related Interview Question to
What is Weak Entity set?
What is an Entity?
It is a 'thing' in the real world with an independent existence.
What is an Entity type?
It is a collection (set) of entities that have same attributes.
What is an Entity set?
It is a collection of all entities of particular entity type in the database.
What is an Extension of entity type?
The collections of entities of a particular entity type are grouped together into an entity set.
Why struct is not used to hold entity instead of class?
(eventhough struct provides us properties, methods and interface support)
Struct is a value type and
Class is a reference type.
Struct is stored in Stack - so if you pass a struct as argument to method - a new struct will be created on stack and values will be copied - this is a time consumingp process in the order of n.
Class is stored in Heap - so the same reference can be passed to various methods without duplication.
What is strong-typing versus weak-typing? Which is preferred? Why?
Strong typing implies that the types of variables involved in operations are associated to the variable, checked at compile-time, and require explicit conversion; weak typing implies that they are associated to the value, checked at run-time, and are implicitly converted as required. (Which is preferred is a disputable point, but I personally prefer strong typing because I like my errors to be found as soon as possible.)
Why can't struct be used instead of class for storing entity?
Struct is of value type. If we pass it across methods in layers, a new object will be created in the stack thus increasing memory and processing requirement.
So class should be used for creating entity like Employee, Supplier etc.
What is strong typing and weak typing?
Strong type is checking the types of variables at compile time and weak type is checking the types of system as late as possible which is nothing but run time.
Why we use entity framework?
It has been start thhe connection automatically and also automatically close the connection.
Difference between NHibernate and Entity framework.
With NHibernate, one can do the below activity-
Send multiple updates/inserts/deletes at once,Load multiple proxies of a type at once, Load multiple collections of a type at once, Execute object oriented DML statements.
but these are not possible with EntityFramework.
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