DBUtility/DbHelperSQL.cs

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using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
using System.Web.UI.WebControls;
using System.Security.Cryptography;
using System.Text;

namespace ZWL.DBUtility
{
    /// <summary>
    /// 数据访问抽象基础类
    /// Copyright (C) 2004-2008 By zwl 
    /// </summary>
    public abstract class DbHelperSQL
    { 
        public DbHelperSQL()
        {

        }
        //自己解密数据库设置字符串
        protected static string DecryptDBStr(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        } 
        //定义连接字符串。
        protected static string ConnectionString = DecryptDBStr(ConfigurationManager.AppSettings["SQLConnectionString"], "zhangweilong");
        protected static SqlConnection Connection;
        //定义数据库的打开和关闭方法
        protected static void Open()
        {
            if (Connection == null)
            {
                Connection = new SqlConnection(ConnectionString);
            }
            if (Connection.State.Equals(ConnectionState.Closed))
            {
                Connection.Open();
            }
        }