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88 lines
3.0 KiB
88 lines
3.0 KiB
using Apewer.Internals;
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Apewer.Source
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{
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/// <summary>数据库中的表。</summary>
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/// <remarks>
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/// <para>Name: 数据库的表名。</para>
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/// <para>Store: 数据存储区名称。</para>
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/// </remarks>
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[Serializable]
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[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = false, Inherited = true)]
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public sealed class TableAttribute : Attribute
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{
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private string _name;
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private string _store;
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/// <summary>标记表属性。</summary>
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public TableAttribute(string name = null, string store = null)
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{
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_name = TableStructure.RestrictName(name, string.IsNullOrEmpty(name));
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_store = string.IsNullOrEmpty(store) ? null : TableStructure.RestrictName(store, false);
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}
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/// <summary>表名。</summary>
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public string Name { get => _name; }
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/// <summary>存储名。</summary>
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public string Store { get => _store; }
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/// <summary>表的说明信息。(需要数据库客户端支持)</summary>
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public string Description { get; set; }
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/// <summary>独立结构,不依赖 Record 公共属性。</summary>
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internal bool Independent { get; set; }
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/// <summary>使用模型的所有属性,对缺少 Column 特性的属性使用默认参数的 Column 特性。</summary>
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public bool AllProperties { get; set; }
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private static Dictionary<string, TableAttribute> _tac = new Dictionary<string, TableAttribute>();
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/// <summary>解析表特性,默认使用缓存以提升性能。</summary>
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public static TableAttribute Parse<T>(bool useCache = true) where T : IRecord => Parse(typeof(T), useCache);
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/// <summary>解析表特性,默认使用缓存以提升性能。</summary>
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public static TableAttribute Parse(Type type, bool useCache = true)
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{
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var cacheKey = type.FullName;
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if (useCache)
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{
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var hint = null as TableAttribute;
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lock (_tac)
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{
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if (_tac.ContainsKey(cacheKey))
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{
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hint = _tac[cacheKey];
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}
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}
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if (hint != null) return hint;
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}
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// throw new Exception($"类型 {type.FullName} 不包含 {typeof(TableAttribute).FullName}。");
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var tas = type.GetCustomAttributes(typeof(TableAttribute), false);
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if (tas.LongLength < 1L) return null;
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var ta = (TableAttribute)tas[0];
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if (string.IsNullOrEmpty(ta.Name)) ta._name = "_" + type.Name;
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ta.Independent = RuntimeUtility.Contains<IndependentAttribute>(type, true);
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if (useCache)
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{
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lock (_tac)
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{
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if (!_tac.ContainsKey(cacheKey)) _tac.Add(cacheKey, ta);
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}
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}
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return ta;
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}
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}
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}
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