5 changed files with 189 additions and 7 deletions
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using System; |
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using System.Collections.Generic; |
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using System.Reflection; |
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namespace Apewer.Source |
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{ |
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/// <summary>索引。</summary>
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[Serializable] |
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[AttributeUsage(AttributeTargets.Property, AllowMultiple = true, Inherited = true)] |
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public sealed class IndexAttribute : Attribute, IToJson |
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{ |
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PropertyInfo _property = null; |
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ColumnAttribute _column; |
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string _name = null; |
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Order _order = Order.Ascend; |
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/// <summary>索引名称。</summary>
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public string Name { get => _name; } |
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/// <summary>排序。</summary>
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public Order Order { get => _order; set => _order = value; } |
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/// <summary>列。</summary>
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public ColumnAttribute Column { get => _column; } |
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/// <summary>属性。</summary>
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public PropertyInfo Property { get => _property; } |
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/// <summary>表示此属性是索引的一部分。</summary>
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/// <param name="name">索引名称。</param>
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public IndexAttribute(string name) |
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{ |
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if (string.IsNullOrEmpty(name)) throw new ArgumentNullException(nameof(name)); |
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_name = name; |
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} |
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internal void SetColumn(ColumnAttribute column) |
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{ |
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_column = column; |
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} |
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/// <summary>解析列的索引。</summary>
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/// <remarks>注意:此方法不再抛出异常,当不存在正确的列特性时将返回 NULL 值</remarks>
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public static IndexAttribute[] Parse(PropertyInfo property) |
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{ |
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if (property == null) return null; |
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var attributes = property.GetCustomAttributes(typeof(IndexAttribute), true); |
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var ias = new List<IndexAttribute>(); |
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foreach (var attribute in attributes) |
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{ |
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var ia = attribute as IndexAttribute; |
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if (ia == null) continue; |
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if (ia._name.IsEmpty()) continue; |
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ia._property = property; |
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ias.Add(ia); |
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} |
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return ias.ToArray(); |
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} |
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/// <summary>生成 Json 对象。</summary>
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/// <exception cref="NotImplementedException"></exception>
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public Json ToJson() |
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{ |
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var json = Json.NewObject(); |
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json.SetProperty("name", _name); |
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json.SetProperty("order", _order.ToString()); |
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if (_column != null) json.SetProperty("column", _column.ToJson()); |
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return json; |
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} |
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/// <summary></summary>
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public override string ToString() => $"Index = {_name}, Field = {_column?.Field}, Order = {_order}"; |
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} |
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} |
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namespace Apewer.Source |
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{ |
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/// <summary>排序。</summary>
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public enum Order |
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{ |
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/// <summary>升序排序。</summary>
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Ascend, |
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/// <summary>降序排序。</summary>
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Descend |
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} |
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} |
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@ -0,0 +1,44 @@ |
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using System; |
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namespace Apewer.Source |
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{ |
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/// <summary>索引。</summary>
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public sealed class TableIndex |
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{ |
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/// <summary>索引名称。</summary>
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public string Name { get; } |
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/// <summary>表。</summary>
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public TableAttribute Table { get; } |
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/// <summary>索引字段。</summary>
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public IndexAttribute[] Fields { get; } |
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/// <summary>创建索引实例。</summary>
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/// <exception cref="ArgumentNullException"></exception>
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internal TableIndex(string name, TableAttribute table, IndexAttribute[] fields) |
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{ |
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if (name.IsEmpty()) throw new ArgumentNullException(nameof(name)); |
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if (table == null) throw new ArgumentNullException(nameof(table)); |
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if (fields == null) throw new ArgumentNullException(nameof(fields)); |
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Name = name; |
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Table = table; |
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Fields = fields; |
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} |
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/// <summary></summary>
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public override string ToString() |
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{ |
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var fields = Fields.FindAll(x => x != null && x.Column != null); |
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if (fields.IsEmpty()) return Name; |
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var array = fields.Map(x => x.Order == Order.Ascend ? x.Column.Field : $"{x.Column.Field} DESC"); |
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return $"{Name} ({array.Join(", ")})"; |
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} |
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} |
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} |
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