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小编给大家分享一下asp.net如何实现MVC跨数据库多表联合动态条件查询功能，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
具体如下：
一、控制器中方法
[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;
}注：Security.HtmlHelper.GetQueryString(），StringFilter(）为自己封装的方法，用于过滤参数值
二、BLL层方法
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(' ').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;
}
}
}注：注意观察由DataTable转换为可枚举的可用于Linq查询的方法方式。
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;
}注：注意其中使用的跨数据库查询的方式和union的一种使用方式
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";
}
}
}
}以上是“asp.net如何实现MVC跨数据库多表联合动态条件查询功能”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！
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