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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 == FieldOrder.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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