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10.3 Definig EF Core models -> Adding tables to the Northwind database context class

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This commit is contained in:
Jason Zhu 2022-03-16 23:04:30 +11:00
parent 4e99e8c92b
commit b851fd937a
1 changed files with 27 additions and 4 deletions
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31
Chapter10/WorkingWithEFCore/WorkingWithEFCore/Northwind.cs
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@ -1,9 +1,14 @@
using Microsoft.EntityFrameworkCore;
using static System.Console;
namespace Packt.Shared;
public class Northwind : DbContext
{
// These properties map to tables in database
public DbSet<Category>? Categories { get; set; }
public DbSet<Product>? Products { get; set; }
protected override void OnConfiguring(
DbContextOptionsBuilder optionsBuilder)
{
@ -17,10 +22,28 @@ public class Northwind : DbContext
else
{
string connection = "Data Source=.;" +
"Initial Catalog=Northwind;" +
"Integrated Security=true;" +
"MultipleActiveResultSets=true;";
"Initial Catalog=Northwind;" +
"Integrated Security=true;" +
"MultipleActiveResultSets=true;";
optionsBuilder.UseSqlServer(connection);
}
}
}
protected override void OnModelCreating(
ModelBuilder modelBuilder)
{
// example of using Fluent API instead of attributes
// // to limit the length of a category name to 15
modelBuilder.Entity<Category>()
.Property(category => category.CategoryName)
.IsRequired() // NOT NULL
.HasMaxLength(15);
if (ProjectConstants.DatabaseProvider == "SQLite")
{
// added to "fix" the lack of decimal support in SQLite
modelBuilder.Entity<Product>()
.Property(product => product.Cost)
.HasConversion<double>();
}
}
}