FreeSql/FreeSql/DataAnnotations/ColumnAttribute.cs

using System;
using System.Linq;

namespace FreeSql.DataAnnotations {
	public class ColumnAttribute : Attribute {

		/// <summary>
		/// 数据库列名
		/// </summary>
		public string Name { get; set; }
		/// <summary>
		/// 指定数据库旧的列名，修改实体属性命名时，同时设置此参数为修改之前的值，CodeFirst才可以正确修改数据库字段；否则将视为【新增字段】
		/// </summary>
		public string OldName { get; set; }
		/// <summary>
		/// 数据库类型，如： varchar(255)
		/// </summary>
		public string DbType { get; set; }

		internal bool? _IsPrimary, _IsIdentity, _IsNullable, _IsIgnore, _IsVersion;
		/// <summary>
		/// 主键
		/// </summary>
		public bool IsPrimary { get => _IsPrimary ?? false; set => _IsPrimary = value; }
		/// <summary>
		/// 自增标识
		/// </summary>
		public bool IsIdentity { get => _IsIdentity ?? false; set => _IsIdentity = value; }
		/// <summary>
		/// 是否可DBNull
		/// </summary>
		public bool IsNullable { get => _IsNullable ?? false; set => _IsNullable = value; }
		/// <summary>
		/// 忽略此列，不迁移、不插入
		/// </summary>
		public bool IsIgnore { get => _IsIgnore ?? false; set => _IsIgnore = value; }
		/// <summary>
		/// 设置行锁（乐观锁）版本号，每次更新累加版本号，若更新整个实体时会附带当前的版本号判断（修改失败时抛出异常）
		/// </summary>
		public bool IsVersion { get => _IsVersion ?? false; set => _IsVersion = value; }

		internal string[] _Uniques;
		/// <summary>
		/// 唯一键，在多个属性指定相同的标识，代表联合键；可使用逗号分割多个 UniqueKey 名。
		/// </summary>
		public string Unique {
			get => _Uniques == null ? null : string.Join(", ", _Uniques);
			set {
				if (string.IsNullOrEmpty(value)) {
					_Uniques = null;
					return;
				}
				var val = value?.Trim(' ', '\t', ',');
				if (string.IsNullOrEmpty(val)) {
					_Uniques = null;
					return;
				}
				var arr = val.Split(',').Select(a => a.Trim(' ', '\t').Trim()).Where(a => !string.IsNullOrEmpty(a)).ToArray();
				if (arr.Any() == false) {
					_Uniques = null;
					return;
				}
				_Uniques = arr;
			}
		}
		/// <summary>
		/// 数据库默认值
		/// </summary>
		public object DbDefautValue { get; set; }

		/// <summary>
		/// 类型映射，比如：可将 enum 属性映射成 typeof(string)
		/// </summary>
		public Type MapType { get; set; }
	}
}