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44 lines
1.3 KiB
44 lines
1.3 KiB
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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