/// <summary>
        /// 设置分表dbContext
        /// 需要为操作对象设置可变表名称
        /// 如TableAttr的Name为Data{0}.tablePfx参数为2000.则表名称为Data2000
        /// </summary>
        /// <typeparam name="T">操作对象类型</typeparam>
        /// <param name="subTableArg">分表参数</param>
        /// <returns>返回subTableDbContext.只能用于指定分表操作.</returns>
        public SubTableDbContext GetSubTableDbContext <T>(object subTableArg)
        {
            SubTableDbContext subTableDbContext = new SubTableDbContext(this.ConnectString, this.DbType);

            subTableDbContext.AddSubTableArg <T>(subTableArg);
            return(subTableDbContext);
        }
        /// <summary>
        /// 设置分表dbContext
        /// 需要为操作对象设置可变表名称
        /// 如TableAttr的Name为Data{0}.tablePfx参数为2000.则表名称为Data2000
        /// </summary>
        /// <typeparam name="T">操作对象类型</typeparam>
        /// <param name="subTableArg">分表参数</param>
        /// <returns>返回subTableDbContext.只能用于指定分表操作.</returns>
        public virtual SubTableDbContext SubTable <T>(object subTableArg)
        {
            SubTableDbContext subTableDbContext = null;

            if (this is SubTableDbContext)
            {
                subTableDbContext = (SubTableDbContext)this;
                subTableDbContext.AddSubTableArg <T>(subTableArg);
            }
            else
            {
                subTableDbContext = new SubTableDbContext(this.ConnectString, this.DbType);
                subTableDbContext.AddSubTableArg <T>(subTableArg);
            }
            return(subTableDbContext);
        }