seed data ef core code example
Example 1: entity framework core data seed
modelBuilder.Entity<Blog>().HasData(new Blog {BlogId = 1, Url = "http://sample.com"});
Example 2: database hasData method C#
// it goes into class ApplicationDbContext : DbContext
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Author>().HasData(
new Author
{
AuthorId = 1,
FirstName = "William",
LastName = "Shakespeare"
}
);
modelBuilder.Entity<Book>().HasData(
new Book { BookId = 1, AuthorId = 1, Title = "Hamlet" },
new Book { BookId = 2, AuthorId = 1, Title = "King Lear" },
new Book { BookId = 3, AuthorId = 1, Title = "Othello" }
);
/*further relational instructions may come here, like:
modelBuilder.Entity<Author>()
.HasMany<Book>(a => a.Books)
.WithOne(b => b.Author)
.HasForeignKey(b => b.AuthorId);
}