In this chapter, you learned how we can configure persistence layer details for entities and classes that map to database structures, specifically tables. We learned that we can use attributes, entity type configuration classes or model builder APIs to perform this task. We discovered that we can make columns nullable by using appropriate nullable types in .NET. We looked at mappings between .NET types and SQL Server types as an example of an RDMBS. We discovered that primitive types, such as numbers and strings, have corresponding property configuration classes that expose methods, allowing us to make those properties required, or configure the maximum allowable length. We learned that using the EntityTypeConfiguration class allows us to neatly organize our configuration code. We saw that this class exposes the API that affords developers an opportunity to configure all the properties in a fluent manner.

We also learned that classes can have relationships between each other. We saw...