能用存储过程的DBHelper类

/*
 *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;
        }