sqlserver数据库 -- SqlParameter使用

查看：public sealed class SqlParameterCollection : DbParameterCollection类

//1。定义封装类

class Param
    {
        private List<SqlParameter> paramList=new List<SqlParameter>();
        public SqlParameter[] ParamList{
        get{
        return paramList.ToArray();
        }
        }
        /// <summary>
        /// 增添类型为VarChar预处理值
        /// </summary>
        /// <param name="ParamName"></param>
        /// <param name="value"></param>
            public void AddChar(string ParamName,string value)
            {
             SqlParameter p=new SqlParameter(ParamName,SqlDbType.VarChar);
                p.Value=value;
                paramList.Add(p);
            }
            public void CleanParam()
        {
        paramList.Clear();
        }
        /// <summary>
        /// 增添类型为Int预处理值
        /// </summary>
        /// <param name="ParamName"></param>
        /// <param name="value"></param>
            public void AddInt(string ParamName, int value)
            {
                SqlParameter p = new SqlParameter(ParamName, SqlDbType.Int);
                p.Value = value;
                paramList.Add(p);
            }
        /// <summary>
        /// 增添类型为float预处理值
        /// </summary>
        /// <param name="ParamName"></param>
        /// <param name="value"></param>
            public void AddFloat(string ParamName, float value)
            {
                SqlParameter p = new SqlParameter(ParamName, SqlDbType.Float);
                p.Value = value;
                paramList.Add(p);
            }
    }

//2。使用举例

    查看：public sealed class SqlParameterCollection : DbParameterCollection类

   /// <summary>
        /// 获取数据，进行数据的绑定
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="p">预处理的值</param>
        /// <returns></returns>
        public DataTable DataList(string sql, SqlParameter[] p)
        {
            SqlCommand cmd = new SqlCommand(sql,conn);
            cmd.Parameters.AddRange(p);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            return ds.Tables[0];
        }

 //3。 注意

使用集合参数paramList，在使用之前需要将集合清空 ，防止在sql 语句中增添无效参数

paramList.Clear();