Asp.net(c#)数据库操作类

兴宁A8网 · 发表于 2009/11/28 14:07

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace Mysqlserver
{
/// <summary>
/// SqlServerDataBase 的摘要说明
/// </summary>
public class SqlServerDataBase
{
      private string strError = null;
      private int intCount = 0;
      public SqlServerDataBase()
      {
         //
         // TODO: 在此处添加构造函数逻辑
         //
      }
      /// <summary>
      /// 公开方法DBConn，返回数据库连接
      /// </summary>
      /// <returns></returns>
      public SqlConnection DBconn()
      {
         string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd=";
         try
         {
            return new SqlConnection(strConn);
         }
         catch (Exception)
         {
            return null;
         }
      }
      /// <summary>
      /// 公开属性ErrorMessage，返回错误信息
      /// </summary>
      public string ErrorMessage
      {
         get
         {
            return strError;
         }
      }
      /// <summary>
      /// 根据查询语句从数据库检索数据
      /// </summary>
      /// <param name="strSelect">查询语句</param>
      /// <param name="SqlConn">数据库连接</param>
      /// <returns>有数据则返回DataSet对象，否则返回null</returns>
      public DataSet Select(string SelectString, SqlConnection sqlConn)
      {
         strError = "";
         SqlConnection conn;
         if (sqlConn == null)
         {
            conn = DBconn();
         }
         else
         {
            conn = sqlConn;
         }
         try
         {
            //若数据库连接的当前状态是关闭的，则打开连接
            if (conn.State == ConnectionState.Closed)
            {
                  conn.Open();
            }
            SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
            SqlCommand selectCommand = new SqlCommand(SelectString, conn);
            selectCommand.CommandType = CommandType.Text;
            mySqlDataAdapter.SelectCommand = selectCommand;
            DataSet myDS = new DataSet();
            mySqlDataAdapter.Fill(myDS);
            return myDS;
         }
         catch (Exception e)
         {
            strError = "数据检索失败：" + e.Message;
            return null;
         }
         finally
         {
            if (conn.State != ConnectionState.Closed)
            {
                  conn.Close();
            }
         }
      }
      /// <summary>
      /// 更新数据库
      /// </summary>
      /// <param name="UpdateString">Update Sql语句</param>
      /// <param name="SqlConn">数据库连接</param>
      /// <returns>更新成功返回true</returns>
      public bool Update(string UpdateString, SqlConnection SqlConn)
      {
         return udiDataBase(UpdateString, SqlConn);
      }
      /// <summary>
      /// 从数据库中删除数据
      /// </summary>
      /// <param name="DeleteString">Delete Sql语句</param>
      /// <param name="SqlConn">数据库连接</param>
      /// <returns>删除成功返回true</returns>
      public bool Delete(string DeleteString, SqlConnection SqlConn)
      {
         return udiDataBase(DeleteString, SqlConn);
      }
      /// <summary>
      /// 把数据插入数据库
      /// </summary>
      /// <param name="InsertString">Insert Sql语句</param>
      /// <param name="SqlConn">数据库连接</param>
      /// <returns>插入成功返回true</returns>
      public bool Insert(string InsertString, SqlConnection SqlConn)
      {
         return udiDataBase(InsertString, SqlConn);
      }
      /// <summary>
      /// 根据Sql语句更新数据库
      /// </summary>
      /// <param name="UDIString">更新语句</param>
      /// <param name="SqlConn">数据库连接</param>
      /// <returns>更新成功则返回true</returns>
      public bool udiDataBase(string UDIString, SqlConnection SqlConn)
      {
         strError = "";
         SqlConnection conn;
         if (SqlConn == null)
         {
            conn = DBconn();
         }
         else
         {
            conn = SqlConn;
         }
         try
         {
            if (conn.State == ConnectionState.Closed)
            {
                  conn.Open();
            }
            SqlCommand cmd = new SqlCommand(UDIString, conn);
            cmd.CommandType = CommandType.Text;
            intCount = cmd.ExecuteNonQuery();
            return !(intCount < 1);
         }
         catch (Exception e)
         {
            strError = "更新数据库失败：" + e.Message;
            return false;
         }
         finally
         {
            if (conn.State != ConnectionState.Closed)
            {
                  conn.Close();
            }
         }
      }
}
}
-----------------------------
两种调用方法
1、                   string strUserPsw = UserPsw.Text.Trim();
                  string UserPassword = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strUserPsw, "MD5");//md5加密
                  SqlServerDataBase obj = new SqlServerDataBase();
                  obj.Insert("insert into asUserInfo (UserName,UserPassword,Question,Answer,CreateTime) values('" + UserName.Text.Trim() + "','" + UserPassword + "','" + Question.Text.Trim() + "','" + Answer.Text.Trim() + "','" + DateTime.Now.ToString() + "' )", null);
2、       private bool IsUsernameExist(string strUsername)
      {
         bool bRet = true;
         SqlServerDataBase db = new SqlServerDataBase();
         DataSet ds = db.Select("select * from asUserInfo where UserName = '" + strUsername + "'", null);
         if (ds == null || ds.Tables.Count == 0 || ds.Tables[0].Rows.Count == 0)
         {
            bRet = false;
         }
         else
         {
            bRet = true;
         }
         return bRet;
      }