Mapping to an existing Schema (DB-First)
- Sebastian Greulach
- Remo von Ballmoos
Quino is a metadata-first framework. The standard way of creating metadata is to create it using the modeling API in C#.
Quino derives the names of the database-schema elements from the names of various elements of the metadata. An application can control this mapping with the ISchemaIdentifierBuilder and ISchemaIdentifierBuilderSettings, which, in turn, use the low-level IIdentifierTransformer and IIdentifierBuilder.
Consider the following class with a single property in a model named Punchclock.
Elements.Person = Builder.Add.Class(nameof(Elements.Person));
Elements.Person.Add.Property("FirstName", MetaType.Text);What if an application wants to build a model that maps to an existing database schema?
That is, what if the table and column name are already defined in a legacy database, but the application would still like to map a model onto it?
Can the application define the model using a different naming scheme?
Suppose the FirstName property above should map to tblPerson.Vorname. We extend the code above as follows.
Elements.Person = Builder.Add.Class(nameof(Elements.Person)).Table("tblPerson");
Elements.Person
.Add
.Property("FirstName", MetaType.Text)
.Column("Vorname");Instead of automatically calculating its own schema identifiers, Quino uses the ones assigned in the model.