ow

CloudBuilder/CloudBuilder.Core/DatabaseAccessor/Entity/EntityBase.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CloudBuilder.Core.DatabaseAccessor.Entity
+{
+    /// <summary>
+    /// 实体类基类
+    /// </summary>
+    public abstract class EntityBase<TKey> : IEntity<TKey>
+    {
+        /// <summary>
+        /// 获取或设置 编号
+        /// </summary>
+        [DisplayName("编号")]
+        [NotMapped]
+        public TKey? Id { get; set; }
+
+        public virtual string GetSelectFrom()
+        {
+            return null;
+        }
+
+        public virtual string GetSelectCountFrom(string sqlWhere)
+        {
+            return null;
+        }
+
+        public virtual string GetSelectTopFrom(int limit, int start, string orderby, string orderbytag, string sqlWhere)
+        {
+            return null;
+        }
+
+        /// <summary>
+        /// 判断两个实体是否是同一数据记录的实体
+        /// </summary>
+        /// <param name="obj">要比较的实体信息</param>
+        /// <returns></returns>
+        public override bool Equals(object obj)
+        {
+            if (obj == null)
+            {
+                return false;
+            }
+            if (!(obj is EntityBase<TKey> entity))
+            {
+                return false;
+            }
+            return IsKeyEqual(entity.Id, Id);
+        }
+
+        /// <summary>
+        /// 实体ID是否相等
+        /// </summary>
+        public static bool IsKeyEqual(TKey id1, TKey id2)
+        {
+            if (id1 == null && id2 == null)
+            {
+                return true;
+            }
+            if (id1 == null || id2 == null)
+            {
+                return false;
+            }
+
+            return Equals(id1, id2);
+        }
+
+        /// <summary>
+        /// 用作特定类型的哈希函数。
+        /// </summary>
+        /// <returns>
+        /// 当前 <see cref="T:System.Object"/> 的哈希代码。<br/>
+        /// 如果<c>Id</c>为<c>null</c>则返回0，
+        /// 如果不为<c>null</c>则返回<c>Id</c>对应的哈希值
+        /// </returns>
+        public override int GetHashCode()
+        {
+            if (Id == null)
+            {
+                return 0;
+            }
+            return Id.ToString().GetHashCode();
+        }
+    }
+}