admin/products/buhuo1.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data.SqlClient;
using System.Data;

public partial class admin_products_buhuo1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        //更新   
        StringBuilder strSql = new StringBuilder();

        strSql.Append("update products set ");
        strSql.Append("quan =quan+ @quan");
  
        strSql.Append("  where pid=@pid");
        int pid = int.Parse(Request.QueryString["id"]);

        //设置参数
        SqlParameter[] parameters = new SqlParameter[] {
                    new SqlParameter("@pid", SqlDbType.Int,4),
                    new SqlParameter("@quan", SqlDbType.Int,4) };
        parameters[0].Value = pid;
        parameters[1].Value = txt_quan.Text;


        //提交到数据库
        SqlHelper.ExecuteNonQuery(strSql.ToString(), CommandType.Text, parameters);

        MessageBox.ShowAndRedirect(this, "补货成功，请返回!", "buhuo.aspx");
    }
}