Fluent nHibernate: Use the same mapping files for tables with the same structure in different schemas

Fluent nHibernate: Use the same mapping files for tables with the same structure in different schemas

To use the same mapping files for tables with the same structure in different schemas, you can create a base mapping file with the common properties and use it to derive the mappings for each schema. Here's an example:

Let's say you have two tables with the same structure, one in the dbo schema and the other in the hr schema. You want to use the same mapping file for both tables.

First, create a base mapping file with the common properties, let's call it BaseEntityMap:

public abstract class BaseEntityMap<T> : ClassMap<T> where T : class
{
    public BaseEntityMap()
    {
        Id(x => x.Id).GeneratedBy.GuidComb();
        Map(x => x.Name).Not.Nullable().Length(50);
        // add more common properties here
    }
}

Then, derive two mapping files, one for each schema, and inherit from the BaseEntityMap:

public class EntityMap : BaseEntityMap<Entity>
{
    public EntityMap()
    {
        Table("Entity");
        // add schema-specific properties here
    }
}

public class EntityHrMap : BaseEntityMap<Entity>
{
    public EntityHrMap()
    {
        Table("Entity", "hr");
        // add schema-specific properties here
    }
}

Notice that the Table method is used to specify the schema and table name for each mapping.

Finally, add the mapping files to your NHibernate configuration:

var sessionFactory = Fluently.Configure()
    .Database(/* configure your database */)
    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<EntityMap>())
    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<EntityHrMap>())
    .BuildSessionFactory();

This way, NHibernate will use the same mapping files for tables with the same structure in different schemas.

Examples

  1. How to configure Fluent NHibernate to use the same mapping files for tables with identical structures in different schemas in C#:

    configuration.Mappings(m => m.FluentMappings.AddFromAssemblyOf<YourMappingClass>());

    This code snippet demonstrates configuring Fluent NHibernate to scan the assembly containing your mapping classes and add them as Fluent mappings, allowing the same mapping files to be used for tables in different schemas.

  2. Using Fluent NHibernate to specify schema dynamically based on runtime conditions in C#:

    public class YourMappingClass : ClassMap<YourEntity>
{
    public YourMappingClass()
    {
        Schema("SchemaName");
        // Other mapping configurations...
    }
}

    By specifying the schema dynamically within the mapping class, you can use the same mapping files for tables with identical structures in different schemas, adapting to runtime conditions.

  3. Configuring Fluent NHibernate to use a schema resolver for dynamic schema selection in C#:

    configuration.SchemaAction<Schemas.SchemaResolver>();

    This code sets up Fluent NHibernate to use a custom schema resolver SchemaResolver that dynamically selects the schema based on runtime conditions, enabling the same mapping files to be used for tables in different schemas.

  4. Fluent NHibernate: Sharing mapping files between entities with the same structure but different schemas in C#:

    configuration.Mappings(m => m.FluentMappings.AddFromAssemblyOf<YourMappingClass>());

    By adding Fluent mapping files from the assembly of a common mapping class, you can share mapping configurations between entities with identical structures but different schemas in Fluent NHibernate.

  5. Using Fluent NHibernate to configure schema dynamically based on a configuration setting in C#:

    configuration.SchemaAction<Schemas.ConfigurationBasedSchemaResolver>();

    This code sets up Fluent NHibernate to use a schema resolver ConfigurationBasedSchemaResolver that selects the schema based on a configuration setting, allowing the same mapping files to be used for tables in different schemas.

  6. Fluent NHibernate: Configuring schema dynamically using a convention-based approach in C#:

    public class SchemaConvention : IClassConvention
{
    public void Apply(IClassInstance instance)
    {
        instance.Schema(instance.EntityType.Namespace);
    }
}

    By implementing a convention-based approach like the SchemaConvention, you can configure schema dynamically based on namespace, allowing the same mapping files to be used for tables in different schemas.

  7. Fluent NHibernate: Using a custom schema resolver to resolve schema dynamically at runtime in C#:

    public class CustomSchemaResolver : DefaultDatabaseSchemaResolver
{
    // Custom logic to resolve schema dynamically
}

    Implementing a custom schema resolver like CustomSchemaResolver allows Fluent NHibernate to resolve schema dynamically at runtime, enabling the same mapping files to be used for tables in different schemas.

  8. Fluent NHibernate: Sharing mapping files between entities in different schemas using a shared base class in C#:

    public abstract class BaseMappingClass<T> : ClassMap<T> where T : BaseEntity
{
    public BaseMappingClass()
    {
        // Common mapping configurations...
    }
}

    By defining a shared base mapping class like BaseMappingClass, you can share common mapping configurations between entities in different schemas, ensuring consistency in mapping files.

  9. Fluent NHibernate: Configuring schema dynamically based on environment variables in C#:

    configuration.SchemaAction<Schemas.EnvironmentVariableBasedSchemaResolver>();

    This code sets up Fluent NHibernate to use a schema resolver EnvironmentVariableBasedSchemaResolver that selects the schema based on environment variables, allowing the same mapping files to be used for tables in different schemas.

  10. Fluent NHibernate: Using a convention-based approach to infer schema dynamically from entity names in C#:

    public class SchemaConvention : IClassConvention
{
    public void Apply(IClassInstance instance)
    {
        instance.Schema(instance.EntityType.Name);
    }
}

    Implementing a convention like SchemaConvention allows Fluent NHibernate to infer schema dynamically from entity names, providing flexibility in schema selection for tables with the same structure but different schemas.

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