A:增加数据库配置和使用

test/Data.Test/TestDbContext.cs

@@ -0,0 +1,183 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace Data.Test;
+
+/// <summary>
+/// 测试用的数据库上下文
+/// 演示如何配置各种类型的实体
+/// </summary>
+public class TestDbContext : DbContext
+{
+    public TestDbContext(DbContextOptions<TestDbContext> options) : base(options)
+    {
+    }
+
+    // 使用基类的实体
+    public DbSet<Product> Products => Set<Product>();
+    public DbSet<Category> Categories => Set<Category>();
+    public DbSet<Tag> Tags => Set<Tag>();
+
+    // 自定义实体
+    public DbSet<CustomProduct> CustomProducts => Set<CustomProduct>();
+    public DbSet<Region> Regions => Set<Region>();
+
+    // 实现接口的实体
+    public DbSet<Order> Orders => Set<Order>();
+    public DbSet<Notification> Notifications => Set<Notification>();
+    public DbSet<Customer> Customers => Set<Customer>();
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        ConfigureProductEntity(modelBuilder);
+        ConfigureCategoryEntity(modelBuilder);
+        ConfigureTagEntity(modelBuilder);
+        ConfigureCustomProductEntity(modelBuilder);
+        ConfigureRegionEntity(modelBuilder);
+        ConfigureOrderEntity(modelBuilder);
+        ConfigureNotificationEntity(modelBuilder);
+        ConfigureCustomerEntity(modelBuilder);
+    }
+
+    /// <summary>
+    /// 配置 Product 实体 (使用 AuditableEntity)
+    /// </summary>
+    private void ConfigureProductEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Product>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Name).IsRequired().HasMaxLength(100);
+            entity.Property(e => e.Price).HasPrecision(18, 2);
+            entity.Property(e => e.Description).HasMaxLength(500);
+
+            // 添加索引
+            entity.HasIndex(e => e.Name);
+            entity.HasIndex(e => e.IsDeleted); // 软删除字段索引（提升查询性能）
+        });
+    }
+
+    /// <summary>
+    /// 配置 Category 实体 (使用 Entity 基类)
+    /// </summary>
+    private void ConfigureCategoryEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Category>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Name).IsRequired().HasMaxLength(50);
+            entity.Property(e => e.Description).HasMaxLength(200);
+        });
+    }
+
+    /// <summary>
+    /// 配置 Tag 实体 (使用 EntityInt 基类，自增主键)
+    /// </summary>
+    private void ConfigureTagEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Tag>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Id).ValueGeneratedOnAdd(); // 自增
+            entity.Property(e => e.Name).IsRequired().HasMaxLength(50);
+            entity.Property(e => e.Color).HasMaxLength(20);
+        });
+    }
+
+    /// <summary>
+    /// 配置 CustomProduct 实体 (完全自定义)
+    /// </summary>
+    private void ConfigureCustomProductEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<CustomProduct>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Name).IsRequired().HasMaxLength(100);
+            entity.Property(e => e.Price).HasPrecision(18, 2);
+            entity.Property(e => e.CreatedDate).IsRequired();
+
+            // 忽略计算属性
+            entity.Ignore(e => e.IsExpensive);
+        });
+    }
+
+    /// <summary>
+    /// 配置 Region 实体 (字符串主键)
+    /// </summary>
+    private void ConfigureRegionEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Region>(entity =>
+        {
+            entity.HasKey(e => e.Code); // 字符串作为主键
+            entity.Property(e => e.Code).HasMaxLength(10);
+            entity.Property(e => e.Name).IsRequired().HasMaxLength(100);
+            entity.Property(e => e.Description).HasMaxLength(500);
+        });
+    }
+
+    /// <summary>
+    /// 配置 Order 实体 (实现接口但不使用基类)
+    /// </summary>
+    private void ConfigureOrderEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Order>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.OrderNumber).IsRequired().HasMaxLength(50);
+            entity.Property(e => e.TotalAmount).HasPrecision(18, 2);
+
+            // 索引
+            entity.HasIndex(e => e.OrderNumber).IsUnique();
+            entity.HasIndex(e => e.IsDeleted);
+        });
+    }
+
+    /// <summary>
+    /// 配置 Notification 实体 (只实现软删除)
+    /// </summary>
+    private void ConfigureNotificationEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Notification>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Title).IsRequired().HasMaxLength(200);
+            entity.Property(e => e.Content).IsRequired();
+            entity.HasIndex(e => e.IsDeleted);
+        });
+    }
+
+    /// <summary>
+    /// 配置 Customer 实体 (包含值对象)
+    /// </summary>
+    private void ConfigureCustomerEntity(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Customer>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.Name).IsRequired().HasMaxLength(100);
+            entity.Property(e => e.Email).IsRequired().HasMaxLength(200);
+
+            // 配置值对象 - 方式1: 使用 OwnsOne
+            entity.OwnsOne(e => e.ShippingAddress, address =>
+            {
+                address.Property(a => a.Street).HasMaxLength(200);
+                address.Property(a => a.City).HasMaxLength(100);
+                address.Property(a => a.State).HasMaxLength(50);
+                address.Property(a => a.ZipCode).HasMaxLength(20);
+                address.Property(a => a.Country).HasMaxLength(50);
+            });
+
+            entity.OwnsOne(e => e.BillingAddress, address =>
+            {
+                address.Property(a => a.Street).HasMaxLength(200);
+                address.Property(a => a.City).HasMaxLength(100);
+                address.Property(a => a.State).HasMaxLength(50);
+                address.Property(a => a.ZipCode).HasMaxLength(20);
+                address.Property(a => a.Country).HasMaxLength(50);
+            });
+
+            entity.HasIndex(e => e.Email);
+        });
+    }
+}