DAL/users.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using Models;

namespace DAL
{
    /// <summary>
    /// 用户数据访问类
    /// </summary>
    public class users
    {
        public users()
        { }
        #region 成员方法
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public bool Exists(string uid,string pwd)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select count(1) from tb_Users");
            strSql.Append(" where userName=@username and userPwd=@userpwd");//此SQL语句只返回结果0或1
            SqlParameter[] parms ={ new SqlParameter("@username", SqlDbType.NVarChar, 20), new SqlParameter("@userpwd", SqlDbType.NVarChar, 20) };
            parms[0].Value = uid;
            parms[1].Value = pwd;
            bool pass = DbHelperSQL.Exists(strSql.ToString(), parms);

            return pass;
        }

        public void Add(tb_Users model)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("insert into tb_Users(");
            strSql.Append("userName,userPwd,userGroup");
            strSql.Append(")");
            strSql.Append(" values (");
            strSql.Append("'" + model.userName + "',");
            strSql.Append("'" + model.userPwd + "',");
            strSql.Append("" + 0 + "");
            strSql.Append(")");
            DbHelperSQL.ExecuteSql(strSql.ToString());
        }
        public void Update(tb_Users model)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("update tb_Users set ");
            //strSql.Append("userName='" + model.userName + "',");
            //strSql.Append("userPwd='" + model.userPwd + "',");
            strSql.Append("userGroup=" + model.userGroup + "");
            strSql.Append(" where id=" + model.id + "");
            DbHelperSQL.ExecuteSql(strSql.ToString());
        }
        public void Delete(int id)
        {
            StringBuilder strSql = new StringBuilder();