asp.net数据库操作类（C#）

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

{

    ///

    /// SqlServerDataBase 的摘要说明

    ///

    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

            //

        }

        ///

        /// 公开方法DBConn，返回数据库连接

        ///

        ///

        public SqlConnection DBconn()

        {

            string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd=";

            try

            {

                return new SqlConnection(strConn);

            }

            catch (Exception)

            {

                return null;

            }

        }

        ///

        /// 公开属性ErrorMessage，返回错误信息

        ///

        public string ErrorMessage

        {

            get

            {

                return strError;

            }

        }

        ///

        /// 根据查询语句从数据库检索数据

        ///

        /// 查询语句

        /// 数据库连接

        /// 有数据则返回DataSet对象，否则返回null

        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();

                }

            }

        }

        ///

        /// 更新数据库

        ///

        /// Update Sql语句

        /// 数据库连接

        /// 更新成功返回true

        public bool Update(string UpdateString, SqlConnection SqlConn)

        {

            return udiDataBase(UpdateString, SqlConn);

        }

        ///

        /// 从数据库中删除数据

        ///

        /// Delete Sql语句

        /// 数据库连接

        /// 删除成功返回true

        public bool Delete(string DeleteString, SqlConnection SqlConn)

        {

            return udiDataBase(DeleteString, SqlConn);

        }

        ///

        /// 把数据插入数据库

        ///

        /// Insert Sql语句

        /// 数据库连接

        /// 插入成功返回true

        public bool Insert(string InsertString, SqlConnection SqlConn)

        {

            return udiDataBase(InsertString, SqlConn);

        }

        ///

        /// 根据Sql语句更新数据库

        ///

        /// 更新语句

        /// 数据库连接

        /// 更新成功则返回true

        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;

        }