Created
February 12, 2016 20:11
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Set up an Entity Framework database with one-to-many relationships using Code First
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| using MyProject.Models; | |
| using System.Data.Entity; | |
| using System.Data.Entity.ModelConfiguration.Conventions; | |
| namespace MyProject.Database | |
| { | |
| public class ArchiveDatabase : DbContext | |
| { | |
| // add a connection string in Web.config | |
| // <add name="MyConnection" connectionString="Server=localhost;Database=MyDatabase;Trusted_Connection=true;" providerName="System.Data.SQLClient" /> | |
| public MyDatabase() : base("MyConnection") { } | |
| public DbSet<Case> Cases { get; set; } | |
| public DbSet<Client> Clients { get; set; } | |
| public DbSet<Matter> Matters { get; set; } | |
| protected override void OnModelCreating(DbModelBuilder modelBuilder) | |
| { | |
| // add one-to-many relationships | |
| modelBuilder.Entity<Client>().HasMany(cl => cl.Matters); | |
| modelBuilder.Entity<Matter>().HasMany(m => m.Cases); | |
| // remove cascading delete restriction | |
| modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>(); | |
| base.OnModelCreating(modelBuilder); | |
| } | |
| } | |
| } |
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