Curso GeneXus

Versión: Evolution 3
Curso online

Defining more transactions

We add the Country and Category transactions and specify, in the Attraction transaction, that an attraction belongs to a country and category. We see how GeneXus keeps all related information consistent. 

We show, in practice, the concept of referential integrity, to maintain data consistency. Introduction of foreign keys relative to primary keys and the significance of calling the corresponding attributes in the same manner. Introduction of the difference between the structure of the transaction and the associated physical table (with the concept of “inferred attributes”). Presentation of the selection list as an object automatically created by GeneXus to facilitate work with related data. We show how it is possible to indicate that a foreign key may have no value, through the Nullable property.

Click here for a PDF transcript of the video.
New entities added to the project
Creation of a transaction
Business Components
First transaction design
Working with attributes and domains
Identifying availabe attributes
Relations between entities from reality
Defining more transactions
What are the subtypes?
Another example of database update using transactions without form
Two level transaction used as Business Component, and error management
First transaction design
First transaction design - PDF
Working with attributes and domains
Curso em processo de tradução

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