能用存储过程的DBHelper类

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/* *创建人：陈伟 *创建时间：2010-2-9 14：34 *说明：数据库助手类 */using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data;using System.Data.SqlClient;namespace Book.DAL{    public class DBHelper    {        private SqlConnection conn = null;        private SqlCommand cmd = null;        private SqlDataReader sdr = null;        public DBHelper()        {            string connStr = "data Source=.;database=MYBOOKSHOP;uid=sa;pwd=123";            conn = new SqlConnection(connStr);        }        private SqlConnection GetConn()        {            if (conn.State == ConnectionState.Closed)            {                conn.Open();            }            return conn;        }        /// <summary>        ///  执行不带参数的增删改SQL语句或存储过程        /// </summary>        /// <param name="cmdText">增删改SQL语句或存储过程</param>        /// <param name="ct">命令类型</param>        /// <returns></returns>        public int ExecuteNonQuery(string cmdText, CommandType ct)        {            int res;            try            {                cmd = new SqlCommand(cmdText, GetConn());                cmd.CommandType = ct;                res = cmd.ExecuteNonQuery();            }            catch (Exception ex)            {                throw ex;            }            finally            {                if (conn.State == ConnectionState.Open)                {                    conn.Close();                }            }            return res;        }        /// <summary>        ///  执行带参数的增删改SQL语句或存储过程        /// </summary>        /// <param name="cmdText">增删改SQL语句或存储过程</param>        /// <param name="ct">命令类型</param>        /// <returns>int值</returns>        public int ExecuteNonQuery(string cmdText, SqlParameter[] paras, CommandType ct)        {            int res;            using (cmd = new SqlCommand(cmdText, GetConn()))            {                cmd.CommandType = ct;                cmd.Parameters.AddRange(paras);                res = cmd.ExecuteNonQuery();            }            return res;        }        /// <summary>        ///  执行查询SQL语句或存储过程        /// </summary>        /// <param name="cmdText">查询SQL语句或存储过程</param>        /// <param name="ct">命令类型</param>        /// <returns>Table值</returns>        public DataTable ExecuteQuery(string cmdText, CommandType ct)        {            DataTable dt = new DataTable();            cmd = new SqlCommand(cmdText, GetConn());            cmd.CommandType = ct;            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))            {                dt.Load(sdr);            }            return dt;        }        /// <summary>        ///  执行带参数的查询SQL语句或存储过程        /// </summary>        /// <param name="cmdText">查询SQL语句或存储过程</param>        /// <param name="paras">参数集合</param>        /// <param name="ct">命令类型</param>        /// <returns>Table值</returns>        public DataTable ExecuteQuery(string cmdText, SqlParameter[] paras, CommandType ct)        {            DataTable dt = new DataTable();            cmd = new SqlCommand(cmdText, GetConn());            cmd.CommandType = ct;            cmd.Parameters.AddRange(paras);            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))            {                dt.Load(sdr);            }            return dt;        }        /// <summary>        /// 执行带参数的Scalar查询        /// </summary>        /// <param name="cmdText">查询SQL语句或存储过程</param>        /// <param name="paras">参数集合</param>        /// <param name="ct">命令类型</param>        /// <returns>一个int型值</returns>        public int ExecuteCheck(string cmdText, SqlParameter[] paras, CommandType ct)        {            int result;            using (cmd = new SqlCommand(cmdText, GetConn()))            {                cmd.CommandType = ct;                cmd.Parameters.AddRange(paras);                result = Convert.ToInt32(cmd.ExecuteScalar());            }            return result;        }    }}

用法

// 判断用户名密码是否正确        public bool CheckUser(string LoginId, string LoginPwd)        {            bool check = false;            string cmdText = "procCheckUser";            SqlParameter[] parm = new SqlParameter[]            {                new SqlParameter("@LoginId",LoginId),                new SqlParameter("@LoginPwd",LoginPwd)            };            int one = dh.ExecuteCheck(cmdText, parm, CommandType.StoredProcedure);            if (one > 0)            {                return true;            }            return check;        }         //根据图书类型显示该类型所有图书        public DataTable SelectAllByType(int TypeId)        {            string cmdText = "procSelectAllByType";            SqlParameter[] parm = new SqlParameter[]{                new SqlParameter("@TypeId",TypeId)                };            dt = dh.ExecuteQuery(cmdText, parm, CommandType.StoredProcedure);            return dt;        }