namespace?Smart.DBUtility?{
????using?System;
????using?System.Collections.Generic;
????using?System.Collections;
????using?System.Text;
????using?System.Data;
????using?System.Data.OleDb;
????using?System.Configuration;

????public?abstract?class?AccessHelper?{
????????///?

????????///?數(shù)據(jù)庫連接字符串（web.config來配置）ConnectionStrings
????????///?連接字符串示例格式：Provider=Microsoft.Jet.Oledb.4.0;Data?Source=|DataDirectory|db1.mdb
????????///?

????????public?static?string?connectionString?=?ConfigurationManager.AppSettings[“ConnectionStrings“];

????????#region?公用方法
????????///?

????????///?判斷是否存在某表的某個字段
????????///?

????????///?表名稱
????????///?列名稱
????????///?是否存在