What do you mean by table Per hierarchy?

Table per Hierarchy (TPH): This approach suggests one table for the entire class inheritance hierarchy. The table includes a discriminator column which distinguishes between inheritance classes. This is a default inheritance mapping strategy in Entity Framework.

How do you create a table in code first approach?

Step 1: Primarily add new Project/website in Visual Studio and create User Defined type/class. Step 2: Add some properties which will be the columns in Table, namespace EntityFrameworkCodeFirst….Description

1. Entity Framework Code First.
2. Entity Framework Model First.
3. Entity Framework Data First.

What is table per class hierarchy in hibernate?

In case of table per class hierarchy an discriminator column is added by the hibernate framework that specifies the type of the record. It is mainly used to distinguish the record. To specify this, discriminator subelement of class must be specified. The subclass subelement of class, specifies the subclass.

What is TPH in database?

Table per Hierarchy (TPH) TPH inheritance uses one database table to maintain data for all of the entity types in an inheritance hierarchy. An entire class hierarchy can be mapped to a single table. The table includes columns for all properties of all classes in the hierarchy.

Which annotation is used in Table Per hierarchy?

You need to use @Inheritance(strategy=InheritanceType. SINGLE_TABLE), @DiscriminatorColumn and @DiscriminatorValue annotations for mapping table per hierarchy strategy. In case of table per hierarchy, only one table is required to map the inheritance hierarchy.

What is @table in hibernate?

The @Table annotation allows you to specify the details of the table that will be used to persist the entity in the database. The @Table annotation provides four attributes, allowing you to override the name of the table, its catalogue, and its schema, and enforce unique constraints on columns in the table.

How do I create a code first database?

Create A New Database Using Code First In Entity Framework

1. Step 1 – Create Windows form project.
2. Step 2 – Add entity frame work into newly created project using NuGet package.
3. Step 3 – Create Model into project.
4. Step 4 – Create Context class into project.
5. Step 5 – Exposed typed DbSet for each classes of model.

What is the difference between code first and database first?

What is the Difference Between Code First and Database First Approach in MVC. The main difference between code first and database first approach in MVC is that the code first allows the programmer to create entity classes with properties first, and then create the database and tables based on the defined entity classes …

Which annotation is used in table Per hierarchy?

Can you tell something about table per class strategy?

Table Per Class strategy is the most logical inheritance solution because it mirrors the object model in the data model. In this pattern a table is defined for each class in the inheritance hierarchy to store only the local attributes of that class. All classes in the hierarchy must share the same id attribute.

What is table per concrete class mapping?

In Table Per Concrete Class strategy a table is defined for each concrete class in the inheritance hierarchy to store all the attributes of that class and all of its superclasses. This strategy is optional in several ORM technologies (e.g. JPA), and querying root or branch classes can be very difficult and inefficient.

What is @table in Hibernate?