DAL

DAL:
调用操作数据库的方法和常用方法来对数据进行增删改查。

如：
 /// <summary>
        /// 是否存在该记录
        /// </summary>
        public bool Exists(int id)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select count(1) from " + databaseprefix + "users");
            strSql.Append(" where id=@id ");
            SqlParameter[] parameters = {
                    new SqlParameter("@id", SqlDbType.Int,4)};
            parameters[0].Value = id;

            return DbHelperSQL.Exists(strSql.ToString(), parameters);
        }

 /// <summary>
        /// 增加一条数据
        /// </summary>
        public int Add(Model.users model)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("insert into " + databaseprefix + "users(");
            strSql.Append

("group_id,user_name,password,salt,email,nick_name,avatar,sex,birthday,telphone,mobile,qq,address,safe_question,safe_answer,amount,point,exp,status,reg_time,reg_ip,isw

eixin,wid,wxOpenId,wxName)");
            strSql.Append(" values (");
            strSql.Append

("@group_id,@user_name,@password,@salt,@email,@nick_name,@avatar,@sex,@birthday,@telphone,@mobile,@qq,@address,@safe_question,@safe_answer,@amount,@point,@exp,@status,

@reg_time,@reg_ip,@isweixin,@wid,@wxOpenId,@wxName)");
            strSql.Append(";select @@IDENTITY");
            SqlParameter[] parameters = {
                    new SqlParameter("@group_id", SqlDbType.Int,4),
                    new SqlParameter("@user_name", SqlDbType.NVarChar,100),
                    new SqlParameter("@password", SqlDbType.NVarChar,100),
                    new SqlParameter("@salt", SqlDbType.NVarChar,20),
                    new SqlParameter("@email", SqlDbType.NVarChar,50),
                    new SqlParameter("@nick_name", SqlDbType.NVarChar,100),
                    new SqlParameter("@avatar", SqlDbType.NVarChar,255),
                    new SqlParameter("@sex", SqlDbType.NVarChar,20),
                    new SqlParameter("@birthday", SqlDbType.DateTime),
                    new SqlParameter("@telphone", SqlDbType.NVarChar,50),
                    new SqlParameter("@mobile", SqlDbType.NVarChar,20),
                    new SqlParameter("@qq", SqlDbType.NVarChar,30),
                    new SqlParameter("@address", SqlDbType.NVarChar,255),
                    new SqlParameter("@safe_question", SqlDbType.NVarChar,255),
                    new SqlParameter("@safe_answer", SqlDbType.NVarChar,255),
                    new SqlParameter("@amount", SqlDbType.Decimal,5),
                    new SqlParameter("@point", SqlDbType.Int,4),
                    new SqlParameter("@exp", SqlDbType.Int,4),
                    new SqlParameter("@status", SqlDbType.TinyInt,1),
                    new SqlParameter("@reg_time", SqlDbType.DateTime),
                    new SqlParameter("@reg_ip", SqlDbType.NVarChar,30),
                    new SqlParameter("@isweixin", SqlDbType.TinyInt,1),
                    new SqlParameter("@wid", SqlDbType.Int,4),
                    new SqlParameter("@wxOpenId", SqlDbType.NVarChar,100),
                    new SqlParameter("@wxName", SqlDbType.NVarChar,150)};
            parameters[0].Value = model.group_id;
            parameters[1].Value = model.user_name;
            parameters[2].Value = model.password;
            parameters[3].Value = model.salt;
            parameters[4].Value = model.email;
            parameters[5].Value = model.nick_name;
            parameters[6].Value = model.avatar;
            parameters[7].Value = model.sex;
            parameters[8].Value = model.birthday;
            parameters[9].Value = model.telphone;
            parameters[10].Value = model.mobile;
            parameters[11].Value = model.qq;
            parameters[12].Value = model.address;
            parameters[13].Value = model.safe_question;
            parameters[14].Value = model.safe_answer;
            parameters[15].Value = model.amount;
            parameters[16].Value = model.point;
            parameters[17].Value = model.exp;
            parameters[18].Value = model.status;
            parameters[19].Value = model.reg_time;
            parameters[20].Value = model.reg_ip;
            parameters[21].Value = model.isweixin;
            parameters[22].Value = model.wid;
            parameters[23].Value = model.wxOpenId;
            parameters[24].Value = model.wxName;
            object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters);
            if (obj == null)
            {
                return 0;
            }
            else
            {
                return Convert.ToInt32(obj);
            }
        }