ASP.NET实现查看数据表总记录数、分页查询

最新推荐文章于 2021-03-03 18:04:25 发布

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最新推荐文章于 2021-03-03 18:04:25 发布

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分类专栏： C# 文章标签： ASP.NET C# 数据表总记录数分页查询

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本文介绍如何使用ASP.NET进行数据表的总记录数查询及分页查询操作，通过解析请求参数确定每页显示的记录数和当前页数，执行SQL语句获取数据并返回JSON格式的结果。

ASP.NET实现查看数据表总记录数、分页查询

   
    string getpagesize = context.Request.Form["pagesize"];//每页显示的记录数

    int pagesize = int.Parse(getpagesize);

    string getnum = context.Request.Form["pagenum"];//指定页数,0表示第一页

    int getpagenum = int.Parse(getnum);

    int pagenum = pagesize * getpagenum;

    string sqlText1 = "select count(*)from [tablename] where id is not null";//查看数据表的总记录数
    DataTable reader1 = sqlconnect.ExecuteDataTable(sqlText1);
    string totalnum = reader1.Rows[0]["Column1"].ToString();

    SqlParameter[] paras2 = new SqlParameter[]{
        new SqlParameter("@pagesize",pagesize),
        new SqlParameter("@pagenum",pagenum),
      };
    //分页查询
    string sqlText2 = "select top " + @pagesize + " * from [tablename] where id not in (select top " + @pagenum + " id from [tablename] order by id desc)order by id desc";
    DataTable reader2 = sqlconnect.ExecuteDataTable(sqlText2, paras2);
    string check2 = DataTableToJson(reader2);

    if (string.IsNullOrWhiteSpace(check2))//判断string是否为空
     {
         Boolean status = false;
         //创建对象
         AbnCheckAllActivityModel model = new AbnCheckAllActivityModel
          {
             Status = status,
             Message = "查询结果为空！",
             totalnum = totalnum,
          };
         //对象序列化Json
         string strJson = JsonConvert.SerializeObject(model);
         context.Response.ContentType = "text/plain";
         context.Response.Write(strJson);
     }
     else
     {
         Boolean status = true;
         //对象
         CheckAllActivityModel model = new CheckAllActivityModel
          {
             Status = status,
             Message = "查询成功!",
             totalnum = totalnum,
             data = check2,
          };
         //对象序列化Json
         string strJson = JsonConvert.SerializeObject(model);
         context.Response.ContentType = "text/plain";
         context.Response.Write(strJson);
     }