How do you get entities back from a query without getting tracked by the context?
How do you get entities back from a query without getting tracked by the context?
The AsNoTracking() extension method returns a new query and returned entities do not track by the context. It means that EF does not perform any additional task to store the retrieve entities for tracking. We can also change the default behavior of tracking at context instance level.
What is discriminator column in Entity Framework?
The Entity Framework Core Fluent API HasDiscriminator method is used to configure aspects of the discriminator column in a table that represents an inheritance hierarchy. By convention, a discriminator column will be configured to use a string data type will be named “Discriminator”.
What is parent key SQL?
A parent key is either a primary key or a unique key in the parent table of a referential constraint. This key consists of a column or set of columns. The values of a parent key determine the valid values of the foreign key in the constraint. This column (or set of columns) is called the parent key of the table.
What is include in Entity Framework?
The Entity Framework Core (EF) extension method Include provides us the ability to load additional data besides the entities we are querying for. For example: loading products along with their translations.
How do I turn off Entity Framework tracking?
In Entity Framework, change tracking is enabled by default. You can also disable change tracking by setting the AutoDetectChangesEnabled property of DbContext to false. If this property is set to true then the Entity Framework maintains the state of entities.
What is inheritance in Entity Framework?
Table per Hierarchy (TPH): Inheritance is a hierarchical concept, in other words where one class is derived from another class. In TPH inheritance one database table stores the full data for all the entities in the inheritance hierarchy format.
Does Entity Framework support inheritance?
By default, Entity Framework supports TPH inheritance, if you don’t define any mapping details for your inheritance hierarchy.
How do I tell EF that there is a parent-child relation?
The key here is that I’m using conventions to tell EF that there is a parent-child relations. Notice how the id names used between the two entities match up. The child has a ParentId that matches ParentId in its parent. Also noticed the foreign key constraint in the child.
Do we need a join in Entity Framework?
Summarized: if you think you’ll need a join in entity framework, think twice, you’ll probably be able to do it simpler by using the ICollection or the reference to the parent if we add role has definition table, how to I add further nested object .
What is the relationship between userdata and userroles in Entity Framework?
It seems you have a true one-to-many relationship between UserData and UserRoles: Every UserData has zero or more UserRoles, and every UserRole belongs to exactly one UserData. Your class definitions deviate from the Entity Framework Code First conventions.
