Code example of joint dynamic condition query across databases and multiple tables in asp.net

This article mainly introduces the MVC cross-database multi-table joint dynamic condition query function implemented by asp.net. It analyzes in detail the cross-database multi-table joint query function implementation skills of asp.net based on the MVC architecture in the form of examples. It needs Friends can refer to the following

The example of this article describes the MVC cross-database multi-table joint dynamic condition query function implemented by asp.net. Share it with everyone for your reference, the details are as follows:

1. Method in Controller

[HttpGet]
public ActionResult Search()
{
  ViewBag.HeadTitle = "搜索";
  ViewBag.MetaKey = "\"123\"";
  ViewBag.MetaDes = "\"456\"";
  string whereText = "";
  if (Security.HtmlHelper.GetQueryString("first", true) != string.Empty)
  {
    whereText += " and a.ParentId='" + StringFilter("first", true)+"'";
  }
  if (Security.HtmlHelper.GetQueryString("second", true) != string.Empty)
    whereText += " and a.categoryId='" + StringFilter("second",true)+"'";
  string valueStr = "";
  if (Security.HtmlHelper.GetQueryString("theme", true) != string.Empty)
    valueStr += StringFilter("theme", true) + ",";
  if (Security.HtmlHelper.GetQueryString("size", true) != string.Empty)
    valueStr += StringFilter("size", true) + ",";
  if (Security.HtmlHelper.GetQueryString("font", true) != string.Empty)
    valueStr += StringFilter("font", true) + ",";
  if (Security.HtmlHelper.GetQueryString("shape", true) != string.Empty)
    valueStr += StringFilter("shape", true) + ",";
  if (Security.HtmlHelper.GetQueryString("technique", true) != string.Empty)
    valueStr += StringFilter("technique", true) + ",";
  if (Security.HtmlHelper.GetQueryString("category", true) != string.Empty)
    valueStr += StringFilter("category", true) + ",";
  if (Security.HtmlHelper.GetQueryString("place", true) != string.Empty)
    valueStr += StringFilter("place", true) + ",";
  if (Security.HtmlHelper.GetQueryString("price", true) != string.Empty)
    valueStr += StringFilter("price", true) + ",";
  if (valueStr != "")
  {
    valueStr=valueStr.Substring(0, valueStr.Length - 1);
    whereText += " and f.valueId in("+valueStr+")";
  }
  if (Security.HtmlHelper.GetQueryString("searchKeys", true) != string.Empty)
    whereText += " and a.SaleTitle like '%'" + StringFilter("searchKes", true) + "'%' or a.SaleDes like '%'" + StringFilter("searchKes", true) + "'%' or a.SaleAuthor like '%'" + StringFilter("searchKes", true) + "'%' or a.KeyWords like '%'" + StringFilter("searchKes", true) + "'%' or g.valueProperty like '%'" + StringFilter("searchKes", true) + "'%'";
  int pageSize = 50;
  int pageIndex = HttpContext.Request.QueryString["pageIndex"].Toint(1);
  List<string> searchInfo = Search(pageIndex, pageSize, whereText, 1);
  if (Security.HtmlHelper.GetQueryString("sort", true) != string.Empty)
  {
    string sort = StringFilter("sort", true);
    switch (sort)
    {
      case "1":  //综合即默认按照上架时间降序排列即按照id降序
        searchInfo = Search(pageIndex, pageSize, whereText, 1);
        break;
      case"2":  //销量
        searchInfo = Search(pageIndex, pageSize, whereText,0, "saleTotal");
        break;
      case "3":  //收藏
        searchInfo = Search(pageIndex, pageSize, whereText,0, "favoritesTotal");
        break;
      case "4":  //价格升序
        searchInfo = Search(pageIndex, pageSize, whereText,1);
        break;
      case "5":  //价格降序
        searchInfo = Search(pageIndex, pageSize, whereText,2);
        break;
    }
  }
  string jsonStr = searchInfo[0];
  ViewData["jsondata"] = jsonStr;
  int allCount = Utility.Toint(searchInfo[1], 0);
  ViewBag.AllCount = allCount;
  ViewBag.MaxPages = allCount % pageSize == 0 ? allCount / pageSize : (allCount / pageSize + 1).Toint(1);
  return View();
}
[NonAction]
public List<string> Search(int pageIndex, int pageSize, string whereText, int orderByPrice, string orderBy = "SaleId")
{
  BLL.Products searchInfoBLL = new BLL.Products();
  List<string> searchInfo = searchInfoBLL.GetSearchInfo(pageIndex, pageSize, whereText, orderByPrice,orderBy);
  return searchInfo;
}

Note: Security.HtmlHelper.GetQueryString() , StringFilter() is its own encapsulated method, used to filter parameter values

2. BLL layer method

using System;
using System.Web;
using System.Web.Caching;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Web.Script.Serialization;
using FotosayMall.Model;
using FotosayMall.Common;
using System.Text.RegularExpressions;
using System.IO;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using FotosayMall.MVC.Models;
namespace FotosayMall.BLL
{
  public class Products
  {
    private readonly DAL.Products dal = new DAL.Products();
    /// <summary>
    /// 分页查询，检索页数据
    /// </summary>
    /// <param name="pageIndex"></param>
    /// <param name="pageSize"></param>
    /// <param name="orderByPrice">价格排序：0默认，1升序，2降序</param>
    /// <returns></returns>
    public List<string> GetSearchInfo(int pageIndex, int pageSize, string whereText, int orderByPrice, string orderBy = "SaleId")
    {
      DataSet searchInfoTables = dal.GetSearchInfo(pageIndex, pageSize, whereText);
      //总记录数
      int allCount = Utility.Toint(searchInfoTables.Tables[1].Rows[0]["rowsTotal"], 0);
      var searchInfo = from list in searchInfoTables.Tables[0].AsEnumerable().OrderByDescending(x => x.Table.Columns[orderBy])
        select new SearchModel
        {
         Url = "/home/products?saleId=" + list.Field<int>("SaleId"),
         Author = list.Field<string>("SaleAuthor"),
         PhotoFileName = list.Field<string>("PhotoFileName"),
         PhotoFilePathFlag = list.Field<int>("PhotoFilePathFlag"),
         Province = list.Field<string>("Place").Split(&#39; &#39;).First(),
         SalePrice = list.Field<decimal>("SalePrice"),
         UsingPrice = list.Field<decimal>("usingPrice"),
         Title = list.Field<string>("SaleTitle").Length > 30 ? list.Field<string>("SaleTitle").Substring(0, 30) : list.Field<string>("SaleTitle"),
         Year = list.Field<DateTime>("BuildTime").ToString("yyyy") == "1900" ? "" : list.Field<DateTime>("BuildTime").ToString("yyyy年")
        };
      if (orderByPrice==2)
        searchInfo = searchInfo.OrderByDescending(x => x.Price);
      else if (orderByPrice == 1)
        searchInfo = searchInfo.OrderBy(x => x.Price);
      string jsonStr = JsonConvert.SerializeObject(searchInfo);
      List<string> dataList = new List<string>();
      dataList.Add(jsonStr);
      dataList.Add(allCount.ToString());
      return dataList;
    }
  }
}

Note: Pay attention to the conversion from DataTable to enumerable methods available for Linq queries.

DAL

/// <summary>
/// 获取检索页数据
/// </summary>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <returns></returns>
public DataSet GetSearchInfo(int pageIndex, int pageSize, string whereText)
{
  StringBuilder sqlText = new StringBuilder();
  sqlText.Append("select * from (");
  sqlText.Append("select a.SaleId,a.PhotoId,SaleTitle,SaleAuthor,a.Status,a.categoryId,c.UserID,c.UserName,b.PhotoFilePathFlag,b.PhotoFileName,coalesce(e.BuildTime,0) BuildTime,c.Place,coalesce(d.usingPrice,0) usingPrice,coalesce(e.SalePrice,0) SalePrice,h.saleTotal,h.favoritesTotal,row_number() over(order by a.saleId) rowsNum ");
  sqlText.Append("from fotosay..Photo_Sale a join fotosay..Photo_Basic b on a.PhotoId = b.PhotoID ");
  sqlText.Append("join fotosay..System_AccountsDescription c on b.UserID = c.UserID ");
  sqlText.Append("left join fotosay..Photo_Sale_Picture d on a.SaleId = d.SaleId ");
  sqlText.Append("left join fotosay..Photo_Sale_Tangible e on a.saleId = e.saleId ");
  sqlText.Append("join FotosayMall..Fotomall_Product_Relation f on f.saleId = a.SaleId ");
  sqlText.Append("join FotosayMall..Fotomall_Product_PropertyValue g on g.categoryId = a.categoryId and g.valueId = f.valueId and g.propertyId = f.propertyId ");
  sqlText.Append("join fotosay..Photo_Sale_Property h on a.saleId = h.saleId ");
  sqlText.Append("where a.Status=1 " + whereText + " ");
  sqlText.Append("group by a.SaleId,a.PhotoId,SaleTitle,SaleAuthor,a.Status,a.categoryId,c.UserID,c.UserName,b.PhotoFilePathFlag,b.PhotoFileName,e.BuildTime,c.Place,usingPrice,SalePrice,h.saleTotal,h.favoritesTotal ");
  sqlText.Append(") t where rowsNum between @PageSize*(@PageIndex-1)+1 and @PageSize*@PageIndex;");
  sqlText.Append("select count(distinct a.saleId) rowsTotal from fotosay..Photo_Sale a join (select b1.PhotoFilePathFlag,b1.PhotoFileName,b1.UserID,b1.PhotoID from fotosay..Photo_Basic b1 union select b2.PhotoFilePathFlag,b2.PhotoFileName,b2.UserID,b2.PhotoID from fotosay..Photo_Basic_History b2 ) b on a.PhotoId = b.PhotoID join fotosay..System_AccountsDescription c on b.UserID = c.UserID left join fotosay..Photo_Sale_Picture d on a.SaleId = d.SaleId left join fotosay..Photo_Sale_Tangible e on a.saleId = e.saleId join FotosayMall..Fotomall_Product_Relation f on f.saleId = a.SaleId join FotosayMall..Fotomall_Product_PropertyValue g on g.categoryId = a.categoryId and g.valueId = f.valueId and g.propertyId = f.propertyId join fotosay..Photo_Sale_Property h on a.saleId = h.saleId where a.Status=1 " + whereText + ";");
  DbParameter[] parameters = {
    Fotosay.CreateInDbParameter("@PageIndex", DbType.Int32,pageIndex),
    Fotosay.CreateInDbParameter("@PageSize", DbType.Int32,pageSize)
    };
  DataSet searchInfoList = Fotosay.ExecuteQuery(CommandType.Text, sqlText.ToString(), parameters);
  //记录条数不够一整页,则查历史库
  if (searchInfoList.Tables[0].Rows.Count < pageSize)
  {
    string sql = "select top(1) a.saleId from fotosay..Photo_Sale a join fotosay..Photo_Basic_History b on a.PhotoId = b.PhotoID join fotosay..System_AccountsDescription c on b.UserID = c.UserID left join fotosay..Photo_Sale_Picture d on a.SaleId = d.SaleId left join fotosay..Photo_Sale_Tangible e on a.saleId = e.saleId join FotosayMall..Fotomall_Product_Relation f on f.saleId = a.SaleId join FotosayMall..Fotomall_Product_PropertyValue g on g.categoryId = a.categoryId and g.valueId = f.valueId and g.propertyId = f.propertyId join fotosay..Photo_Sale_Property h on a.saleId = h.saleId where a.Status=1 " + whereText + ";";
    DataSet ds = Fotosay.ExecuteQuery(CommandType.Text, sql.ToString(), parameters);
    if (ds != null && ds.Tables[0].Rows.Count > 0)
    {
      StringBuilder sqlTextMore = new StringBuilder();
      sqlTextMore.Append("select * from (");
      sqlTextMore.Append("select a.SaleId,a.PhotoId,SaleTitle,SaleAuthor,a.Status,a.categoryId,c.UserID,c.UserName,b.PhotoFilePathFlag,b.PhotoFileName,coalesce(e.BuildTime,0) BuildTime,c.Place,coalesce(d.usingPrice,0) usingPrice,coalesce(e.SalePrice,0) SalePrice,h.saleTotal,h.favoritesTotal,row_number() over(order by a.saleId) rowsNum ");
      sqlTextMore.Append("from fotosay..Photo_Sale a ");
      sqlTextMore.Append("join (select b1.PhotoFilePathFlag,b1.PhotoFileName,b1.UserID,b1.PhotoID from fotosay..Photo_Basic b1 union select b2.PhotoFilePathFlag,b2.PhotoFileName,b2.UserID,b2.PhotoID from fotosay..Photo_Basic_History b2 ) b on a.PhotoId = b.PhotoID join fotosay..System_AccountsDescription c on b.UserID = c.UserID ");
      sqlTextMore.Append("left join fotosay..Photo_Sale_Picture d on a.SaleId = d.SaleId ");
      sqlTextMore.Append("left join fotosay..Photo_Sale_Tangible e on a.saleId = e.saleId ");
      sqlTextMore.Append("join FotosayMall..Fotomall_Product_Relation f on f.saleId = a.SaleId ");
      sqlTextMore.Append("join FotosayMall..Fotomall_Product_PropertyValue g on g.categoryId = a.categoryId and g.valueId = f.valueId and g.propertyId = f.propertyId ");
      sqlTextMore.Append("join fotosay..Photo_Sale_Property h on a.saleId = h.saleId ");
      sqlTextMore.Append("where a.Status=1 " + whereText + " ");
      sqlTextMore.Append("group by a.SaleId,a.PhotoId,SaleTitle,SaleAuthor,a.Status,a.categoryId,c.UserID,c.UserName,b.PhotoFilePathFlag,b.PhotoFileName,e.BuildTime,c.Place,usingPrice,SalePrice,h.saleTotal,h.favoritesTotal");
      sqlTextMore.Append(") t where rowsNum between @PageSize*(@PageIndex-1)+1 and @PageSize*@PageIndex;");
      sqlTextMore.Append("select count(distinct a.saleId) rowsTotal from fotosay..Photo_Sale a join (select b1.PhotoFilePathFlag,b1.PhotoFileName,b1.UserID,b1.PhotoID from fotosay..Photo_Basic b1 union select b2.PhotoFilePathFlag,b2.PhotoFileName,b2.UserID,b2.PhotoID from fotosay..Photo_Basic_History b2 ) b on a.PhotoId = b.PhotoID join fotosay..System_AccountsDescription c on b.UserID = c.UserID left join fotosay..Photo_Sale_Picture d on a.SaleId = d.SaleId left join fotosay..Photo_Sale_Tangible e on a.saleId = e.saleId join FotosayMall..Fotomall_Product_Relation f on f.saleId = a.SaleId join FotosayMall..Fotomall_Product_PropertyValue g on g.categoryId = a.categoryId and g.valueId = f.valueId and g.propertyId = f.propertyId join fotosay..Photo_Sale_Property h on a.saleId = h.saleId where a.Status=1 " + whereText + ";");
      searchInfoList = Fotosay.ExecuteQuery(CommandType.Text, sqlTextMore.ToString(), parameters);
    }
  }
  return searchInfoList;
}

Note: Pay attention to the cross-database query method and the use of union

Model

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;
namespace FotosayMall.MVC.Models
{
  public class SearchModel
  {
    /// <summary>
    /// 原始图片文件夹(用于url地址)
    /// </summary>
    private const string OriginImagesUrlFolder = "userimages/photos_origin";
    /// <summary>
    /// 购买页链接
    /// </summary>
    public string Url { get; set; }
    /// <summary>
    /// 所属域名(1为fotosay，2为img，3为img1)
    /// </summary>
    public int PhotoFilePathFlag { get; set; }
    /// <summary>
    /// 图片名称
    /// </summary>
    public string PhotoFileName { get; set; }
    /// <summary>
    /// 商品名称
    /// </summary>
    public string Title { get; set; }
    /// <summary>
    /// 作者所在省份
    /// </summary>
    public string Province { get; set; }
    /// <summary>
    /// 作者
    /// </summary>
    public string Author { get; set; }
    /// <summary>
    /// 创作年份
    /// </summary>
    public string Year { get; set; }
    /// <summary>
    /// 图片：单次价格
    /// </summary>
    public decimal UsingPrice { get; set; }
    /// <summary>
    /// 实物：定价
    /// </summary>
    public decimal SalePrice { get; set; }
    /// <summary>
    /// 售价
    /// </summary>
    public string Price
    {
      get
      {
        if (this.UsingPrice > 0)
          return this.UsingPrice.ToString();
        else if (this.SalePrice > 0)
          return this.SalePrice.ToString();
        else
          return "议价";
      }
    }
    /// <summary>
    ///
    /// </summary>
    private string MasterSite
    {
      get { return ConfigurationManager.AppSettings["masterSite"].ToString(); }
    }
    /// <summary>
    /// 图片完整路径
    /// </summary>
    public string Img
    {
      get
      {
        return MasterSite + "/" + OriginImagesUrlFolder + this.PhotoFileName + "b.jpg";
      }
    }
  }
}

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