Mapping EF 4.1 code-first models to database tables - asp.net-mvc

Question

I have been trying the model-first method when designing my application. We usually like to add a prefix to our tables in larger databases so it is easier to find stuff. For example:
sc_ = Shopping cart tables
wb_ = Water billing tables
ea_ = Employment Application tables
The class I have setup looks like this so far.
public class EFDbContext : DbContext
{
public DbSet<Transaction> Transactions { get; set; }
public DbSet<TransactionItem> TransactionItems { get; set; }
public DbSet<Response> Response { get; set; }
}
Web.config (set currently for local database testing):
<add name="EFDbContext" connectionString="Data Source=.\SQLEXPRESS;Integrated Security=SSPI;Initial Catalog=database" providerName="System.Data.SqlClient"/>
What do I need to change so that the Transaction object gets linked to the sc_Transactions table? I haven't seen in my searching that clarifies this.
As a second question, do I have to manually create my tables?

Answer 1

You can override the OnModelCreating method from DbContext in your EFDbContext class:
public class EFDbContext : DbContext
{
public DbSet<Transaction> Transactions { get; set; }
public DbSet<TransactionItem> TransactionItems { get; set; }
public DbSet<Response> Response { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Transaction>().MapSingleType().ToTable("someTableNameHere");
}
}
See this post for more info.

Answer 2

You can use System.ComponentModel.DataAnnotations like so:
[Table("tblUser")]
public class User
{
public int ID { get; set; }
public string Name { get; set; }
}
Or with EF 4 you can override the OnModelCreating method to map your tables, which is quite powerful thing as you can map and adjust many things at once.
public class MyContext: DbContext
{
DbSet<User> Users { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<User>().MapSingleType().ToTable("tblUser");
}
}
For more info see:
EF4 CF custom database mapping
EF keynotes from the Build2011 event (custom mappings are at about
15 min or so)