conditionlist.cs

抽象工厂的典型实现

using System;
using System.Collections;

#region 版权声明
///
/// 版权所有(C)2005,2006  作者：漆巧林。保留所有权利, [e-mail], [e-mail]
/// 
/// 作者不对本代码提供任何保证，因此，对于使用该代码带来的损害或者潜在的损害，作者不承担责任。
/// 在满足如下的条件下，你可以自由使用该代码：
/// 1. 非商业应用
/// 2. 保留本版权声明
/// 要进行商业应用，必须得到作者的书面许可。
/// 你可以修改和自由发布本代码，条件是保留前述的版权声明。
/// 
#endregion

namespace DataAccess
{
	/// <summary>
	/// ConditionList: 进行数据库查询时的条件列表
	/// </summary>
	public class ConditionList
	{
		private IList conditionList;

		/// <summary>
		/// 条件项类
		/// </summary>
		public struct ConditionItem
		{
			String fieldName;
			String paramName;
			char relation;
			object fieldValue;

			public ConditionItem(string fieldName, string paramName, char relation, object fieldValue)
			{
				this.fieldName = fieldName;
				this.paramName = paramName;
				this.relation = relation;
				this.fieldValue = fieldValue;
			}

			public string FieldName
			{
				get { return this.fieldName; }
			}

			public string ParamName
			{
				get { return this.paramName; }
			}

			public char Relation
			{
				get { return this.relation; }
			}

			public object FieldValue
			{
				get { return this.fieldValue; }
			}
		};

		public ConditionList()
		{
			this.conditionList = new ArrayList();
		}

		public void Add(string fieldName, string paramName, char relation, object fieldValue)
		{
			this.conditionList.Add(new ConditionItem(fieldName, paramName, relation, fieldValue));
		}

		public void Add(string fieldName, char relation, object fieldValue)
		{
			this.conditionList.Add(new ConditionItem(fieldName, fieldName, relation, fieldValue));
		}

		public ICollection Items
		{
			get { return this.conditionList; }
		}

		public ConditionItem this[int idx]
		{
			get
			{
				return (ConditionItem)this.conditionList[idx];
			}
		}

		public void Clear()
		{
			this.conditionList.Clear();
		}
	}

}