entity class

Any information exchanged as part of those requests (e. g. , parameters) is represented by an instance of an IO Entity class.

An entity class named Order is created, along with a Customer_Order association (relationship) to the Customer entity class.

I've defined a metamodel class as a description of a persistent entity class.

The Code Editor opens with a partial class for the selected entity class.

This is done to more accurately represent the fact that the instantiated entity class maps to a single record of data.

In other words, an entity class can have only a 1: 1 mapping relationship with a database table or view.

DataContext methods that perform Inserts, Updates, and Deletes for a specific entity class.

Demonstrates how to create an entity class and a simple query to filter the entity class.

Such a class is termed an entity class.

On this basis, the prototype of the entity class model and the interface class model is implementated.

However, you can map an entity class to a view that joins multiple related tables.

Configure an entity class to use stored procedures to perform Inserts, Updates, and Deletes.

The input arguments are cls, which is the entity class being searched for; and oid , which is the persistence identifier being searched for.

Select the entity class for which you want to use the stored procedure for performing updates.

Describes how to create DataContext methods that replace the default save logic for an entity class with user-provided stored procedures.

How does this entity class tie in with a database?

These properties determine what namespace the DataContext and entity class code is generated into.

The entity class has properties that map to the columns in the selected table or view.

In addition to checking values during changes, you can validate data when an attempt is made to update a complete entity class.

You will create an entity class that models the Customers table in the sample Northwind database.

Figure 1 shows the entire Department table, along with the corresponding entity class.

An entity class is created and appears on the design surface.

A loader bean is added to the objectgrid. xml along with the necessary entity class names.

In the entity class, a timestamp column is marked by having the IsVersion property set to true.

An entity class named Customer is created.

Complex mapping, such as mapping an entity class to multiple tables, is not supported.

The following procedure shows how to validate when an attempt is made to update a complete entity class.

The entity class is named Customer (not Customers) because it represents a single customer from the Customers table.

The result is a LINQ to SQL entity class that maps to the table in the database.

For example, an entity class named Department is assumed to map to a database tabled named Department.

The entity class is named Order because it represents a single order.

Click Finish to create the data source and add the Customer entity class to the Data Sources window.

The concrete DAO for the Person entity class should add finder methods that are specific to the Person entity

The composite primary key class corresponds to multiple fields or properties of the entity class

To assign stored procedures to override the default behavior of an entity class

You can then define that object as a field on an entity class

Below is an example of how you can define a named query and associate it with an entity class

To create an entity class and map it to a database table

Configuring the Update Behavior of an Entity Class

Separating the Generated DataContext and Entity Class Code into Different Namespaces

Adding Validation for Updates to an Entity Class

To validate data during an update to an entity class

Single table per concrete entity class

Your entity class must have matching fields on the class or it can embed the key as an embeddable key

Entity class is a Hibernate entity, and the,

Creating an Object Data Source with the Customer Entity Class