数据库类的使用！高分相送！

Question

DBAccess.cs 数据操作类
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 MyData
{
    /// <summary>
    /// SqlServerDataBase 的摘要说明
    /// </summary>
    public class DBAccess
    {
        private string strError = null;
        private int intCount = 0;
        public DBAccess()
        {
            //
            // 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=bole;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();
                }
            }
        }
    }}
我想在页面上以显示Dataset显示数据，比如读出user表中的username,userpwd字段内容，忘高手指导！

Answer 1

希望高手把代码写的详细点，我是初学NET的！谢谢!

Answer 2

DataSet ds=Select("select username,userpwd from 表 where 条件",DBconn());GridView1.DataSource=ds;
GridView1.DataBind();

Answer 3

页面放一个 GridView 名字叫 GridView1在 Page_Load 里写上面的话。这详细不？

Answer 4

string sql = "Select * from table where 条件";
        SqlDataAdapter da = new SqlDataAdapter(sql, dbconn);
        DataSet ds = new DataSet();
        da.Fill(ds, "table");
        GridView1.DataSource = ds;
        GridView1.DataBind();你试试可以不？我也是初学者，自己在试着做点东西，这段代码我运行成功的，当然你自己也得在前后加点东西，祝好运o(∩_∩)o...