public virtual string GetFilter(HFSoft.Data.IDriverType driver)

         {

              return " 1=1 " + GetSubString(driver);

         }

         /// <summary>

         /// 获取表达式相关的参数

         /// </summary>

         /// <param name="driver">数据处理设备提供者</param>

         /// <returns>System.Data.IDataParameter[]</returns>

         public virtual System.Data.IDataParameter[] GetDataParams(HFSoft.Data.IDriverType driver)

         {

              return GetSubParams(driver);

         }

         #endregion

         private  System.Collections.ArrayList _Expressions = new System.Collections.ArrayList();

         private  System.Collections.ArrayList _Units = new System.Collections.ArrayList();

         /// <summary>

         /// 添加相关表达式

         /// </summary>

         /// <param name="expressions">表达式对象</param>

         public  void Add(params IExpression[] expressions )

         {

              Add(UintType.And,expressions);

         }

         ///

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