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