SqlParameter的用法

1.SqlParameter表示SqlCommand的参数,也可以是他到DataSet列的映射

到目前为止,我只理解了前半句话,SqlParameter类型的数组作为SqlCommand的参数存在,配合转义字符@,可以有效的防止' or 1=1--单引号而截断字符串,这一经典的注入语句,有效提高拼接型sql命令的安全性。

例:

 

#region   传入参数并且转换为SqlParameter类型
        /// <summary>
        /// 转换参数
        /// </summary>
        /// <param name="ParamName">存储过程名称或命令文本</param>
        /// <param name="DbType">参数类型</param></param>
        /// <param name="Size">参数大小</param>
        /// <param name="Value">参数值</param>
        /// <returns>新的 parameter 对象</returns>
        public SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value)
        {
            return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
        }

        /// <summary>
        /// 初始化参数值
        /// </summary>
        /// <param name="ParamName">存储过程名称或命令文本</param>
        /// <param name="DbType">参数类型</param>
        /// <param name="Size">参数大小</param>
        /// <param name="Direction">参数方向</param>
        /// <param name="Value">参数值</param>
        /// <returns>新的 parameter 对象</returns>
        public SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
        {
            SqlParameter param;

            if (Size > 0)
                param = new SqlParameter(ParamName, DbType, Size);
            else
                param = new SqlParameter(ParamName, DbType);

            param.Direction = Direction;
            if (!(Direction == ParameterDirection.Output && Value == null))
                param.Value = Value;
            return param;
        }
        #endregion

 

 

 

#region   将命令文本添加到SqlCommand
        /// <summary>
        /// 创建一个SqlCommand对象以此来执行命令文本
        /// </summary>
        /// <param name="procName">命令文本</param>
        /// <param name="prams"命令文本所需参数</param>
        /// <returns>返回SqlCommand对象</returns>
        private SqlCommand CreateCommand(string procName, SqlParameter[] prams)
        {
            // 确认打开连接
            this.Open();
            SqlCommand cmd = new SqlCommand(procName, con);
            cmd.CommandType = CommandType.Text;     //执行类型:命令文本

            // 依次把参数传入命令文本
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                    cmd.Parameters.Add(parameter);
            }
            // 加入返回参数
            cmd.Parameters.Add(
                new SqlParameter("ReturnValue", SqlDbType.Int, 4,
                ParameterDirection.ReturnValue, false, 0, 0,
                string.Empty, DataRowVersion.Default, null));

            return cmd;
        }
        #endregion

 

 

   #region   执行参数命令文本(无数据库中数据返回)
        /// <summary>
        /// 执行命令
        /// </summary>
        /// <param name="procName">命令文本</param>
        /// <param name="prams">参数对象</param>
        /// <returns></returns>
        public int RunProc(string procName, SqlParameter[] prams)
        {
            SqlCommand cmd = CreateCommand(procName, prams);
            cmd.ExecuteNonQuery();
            this.Close();
            //得到执行成功返回值
            return (int)cmd.Parameters["ReturnValue"].Value;
        }
        /// <summary>
        /// 直接执行SQL语句
        /// </summary>
        /// <param name="procName">命令文本</param>
        /// <returns></returns>
        public int RunProc(string procName)
        {
            this.Open();
            SqlCommand cmd = new SqlCommand(procName, con);
            cmd.ExecuteNonQuery();
            this.Close();
            return 1;
        }

#endregion

 

public int InsertBaseZcmc(string zcmc)
        {
            SqlParameter[] prams = {
                      data.MakeInParam("@zcmc",  SqlDbType.VarChar, 50, zcmc),
   };
            return (data.RunProc("INSERT INTO tb_BaseZcmc (zcmc) VALUES (@zcmc)", prams));
        }

posted @ 2009-02-07 19:17  梅林听风  阅读(10712)  评论(1编辑  收藏  举报