Entity Framework 4: Code First - Creating db in another schema? MapSingleType?

问题

I have a database and i using 2 different schemas. Schemas are like namespaces (correct me if i am wrong). This way i have 1 db and currently 2 schemas... so the tables in 1 schema can be named the same as the tables in the other schema because they are in separate schemas.

How do i get EF Code first to talk to a different schema and not the default schema?

Is it somethign to do with MapSingleType and overriding a method or can i do something else?

ANy help really appreciated.

回答1:

You can implement the following convention:

public class DefaultSchemaConvention :
             IConfigurationConvention<Type, EntityTypeConfiguration>
{
    string defaultSchema;
    public DefaultSchemaConvention(string defaultSchema)
    {
        if (String.IsNullOrWhiteSpace(defaultSchema))
            throw new ArgumentException("defaultSchema");
        this.defaultSchema = defaultSchema;
    }

    void IConfigurationConvention<Type, EntityTypeConfiguration>.Apply(
         Type memberInfo, Func<EntityTypeConfiguration> configuration)
    {
      EntityTypeConfiguration cfg = configuration();
      string tableName = cfg.EntitySetName;
      if (String.IsNullOrEmpty(tableName))
          tableName = memberInfo.Name;
      cfg.ToTable(tableName, this.defaultSchema);
    }
}  

Usage:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);
    modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.Edm.Db.ColumnTypeCasingConvention>();
    modelBuilder.Conventions.Add(new DefaultSchemaConvention("TEST"));
}  

There is a couple of side notes by Arthur Vickers here concerning TPT inheritance and many-to-many relations.

回答2:

I don't know about the CodeFirst model, but the DataAnnotation for "Table" includes a schema option. My code reads like this:

<Table("Product", Schema:="SalesLT")>
Public Class Product

End Class

This helped me deal with alternate schemas

回答3:

Here is an example how to make entity framework use table schemas based on namespace(s) of your models. For example if you have a model RiaLib.Data.Models.Membership.User then corresponding db table will be called [Membership].[User] instead of [dbo].[User].

public class DatabaseContext : DbContext
{
    public DbSet<Membership.User> Users { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Add(new TableSchemaConvention());

        base.OnModelCreating(modelBuilder);
    }
}

https://github.com/rialib/efextensions > TableSchemaConvention.cs

来源：https://stackoverflow.com/questions/4841847/entity-framework-4-code-first-creating-db-in-another-schema-mapsingletype