ASP.NET MVC + EF 利用存储过程读取大数据,1亿数据测试很OK

看到本文的标题,相信你会忍不住进来看看!

没错,本文要讲的就是这个重量级的东西,这个不仅仅支持单表查询,更能支持连接查询,

加入一个表10W数据,另一个表也是10万数据,当你用linq建立一个连接查询然后利用take,skip读取第N页数据的时候,

你的程序就挂了,因为,你很可能读取需要几十秒甚至几分钟以上。

下面来讲解一下,ASP.NET MVC + EF 利用存储过程读取大数据的详细过程。

1.首先,我们创建一个实体类PageinationInfo,主要用于分页,如下

 1 public class PageinationInfo
 2     {
 3         /// <summary>
 4         /// 要显示的表或多个表的连接
 5         /// </summary>
 6         public string strTable { get; set; }
 7 
 8         /// <summary>
 9         /// 要查询的字段
10         /// </summary>
11         public string strField { get; set; }
12 
13         /// <summary>
14         /// 每页多少条记录
15         /// </summary>
16         public int pageSize { get; set; }
17 
18         /// <summary>
19         /// 当前页
20         /// </summary>
21         public int pageIndex { get; set; }
22 
23         /// <summary>
24         /// 查询条件,不需where
25         /// </summary>
26         public string strWhere { get; set; }
27 
28         /// <summary>
29         /// 用于排序的主键
30         /// </summary>
31         public string strSortKey { get; set; }
32 
33         /// <summary>
34         /// 用于排序,如:id desc (多个id desc,dt asc)
35         /// </summary>
36         public string strSortField { get; set; }
37 
38         /// <summary>
39         /// 排序,0-顺序,1-倒序
40         /// </summary>
41         public bool strOrderBy { get; set; }
42 
43         /// <summary>
44         /// 总记录数
45         /// </summary>
46         public int RecordCount { get; set; }
47 
48         /// <summary>
49         /// 总页数
50         /// </summary>
51         public int PageCount { get; set; }
52 
53         /// <summary>
54         /// 查询耗时,毫秒为单位
55         /// </summary>
56         public int UsedTime { get; set; }
57 
58     }

2.然后我们再DAL层新建一个类 PageinationInfoService 主要用于实现分页读取数据,如下:

 1 public class PageinationInfoService
 2     {
 3         /// <summary>
 4         /// 获取分页列表
 5         /// </summary>
 6         /// <param name="pageinationInfo"></param>
 7         /// <returns></returns>
 8         public IList<Entity> GetPageinationInfoList<Entity>(PageinationInfo pageinationInfo) where Entity : class
 9         {
10             dynamic result = null;
11             using (SnsLearningLogManagerDB db = new SnsLearningLogManagerDB())
12             {
13                 #region SqlParameter参数
14                 SqlParameter[] paras = new SqlParameter[10];
15                 paras[0] = new SqlParameter("strTable", DbType.String);
16                 paras[0].Value = pageinationInfo.strTable;
17 
18                 paras[1] = new SqlParameter("strField", DbType.String);
19                 paras[1].Value = pageinationInfo.strField;
20 
21                 paras[2] = new SqlParameter("pageSize", DbType.Int16);
22                 paras[2].Value = pageinationInfo.pageSize;
23 
24                 paras[3] = new SqlParameter("pageIndex", DbType.Int16);
25                 paras[3].Value = pageinationInfo.pageIndex;
26 
27                 paras[4] = new SqlParameter("strWhere", DbType.String);
28                 paras[4].Value = pageinationInfo.strWhere;
29 
30                 paras[5] = new SqlParameter("strSortKey", DbType.String);
31                 paras[5].Value = pageinationInfo.strSortKey;
32 
33                 paras[6] = new SqlParameter("strSortField", DbType.String);
34                 paras[6].Value = pageinationInfo.strSortField;
35 
36                 paras[7] = new SqlParameter("strOrderBy", DbType.Boolean);
37                 paras[7].Value = pageinationInfo.strOrderBy;
38 
39                 paras[8] = new SqlParameter("RecordCount", DbType.Int16);
40                 paras[8].Value = pageinationInfo.RecordCount;
41                 paras[8].Direction = ParameterDirection.Output;
42 
43                 paras[9] = new SqlParameter("UsedTime", DbType.Int16);
44                 paras[9].Value = pageinationInfo.UsedTime;
45                 paras[9].Direction = ParameterDirection.Output;
46                 #endregion
47 
48                 try
49                 {
50                     result = db.Database.SqlQuery<Entity>("exec LYBPager @strTable,@strField,@pageSize,@pageIndex,@strWhere,@strSortKey,@strSortField,@strOrderBy,@RecordCount output,@UsedTime output", paras).ToList();
51                     pageinationInfo.RecordCount = (int)paras[8].Value;
52                     pageinationInfo.UsedTime = (int)paras[9].Value;
53                 }
54                 catch (Exception ex)
55                 {
56                     throw;
57                 }
58             }
59             return result;
60         }
61     }
PageinationInfoService类中我们传入的参数是实体和PageinationInfo,实体主要是用于接收数据并封装到实体中,LYBPager 这个是数据库中存储过程的名称,而UsedTime 就是存储过程读取数据所用的时间

BLL层的东西,我就不贴出来了,你们或者用工厂模式或者用简单3层,这个都无关紧要。

3.接下来,我们在Controller里来处理我们的业务需求,贴一段自己项目的代码作为分析,如下

 1 public ActionResult Index(string LabelName,string _Title,string _Content, int pageNumber = 1, int pageSize = 10)
 2         {
 3             #region 分页
 4             SnsModels.PageinationInfo pageinationInfo = new SnsModels.PageinationInfo();
 5             pageinationInfo.pageIndex = pageNumber;
 6             pageinationInfo.pageSize = pageSize;
 7             pageinationInfo.RecordCount = 0;
 8             pageinationInfo.strField = "*";
 9             pageinationInfo.strOrderBy = true;
10             pageinationInfo.strSortField = "ArticleID desc";
11             pageinationInfo.strSortKey = "ArticleID";
12             pageinationInfo.strTable = "ArticleInfo";
13             pageinationInfo.strWhere = " 1=1";
14             pageinationInfo.UsedTime = 0;
15             pageinationInfo.PageCount = 0;
16             #endregion
17 
18             IList<SnsModels.LabelInfo> LabelInfoList = Repository.GetList<SnsModels.LabelInfo>();
19             ViewBag.LabelInfoList = new SelectList(LabelInfoList,"LabelName","LabelName");
20 
21             #region 参数处理
22             if (LabelName != null)
23             {
24                 if (!string.IsNullOrEmpty(LabelName))
25                 {
26                     pageinationInfo.strWhere += " and LabelName like '%" + HttpUtility.UrlDecode(LabelName.Trim()) + "%'";
27                     ViewBag.LabelInfoList = new SelectList(LabelInfoList, "LabelName", "LabelName",LabelName.Trim());
28                 }
29             }
30             if (_Title != null)
31             {
32                 if (!string.IsNullOrEmpty(_Title))
33                 {
34                     pageinationInfo.strWhere += " and Title like '%" + _Title.Trim() + "%'";
35                 }
36             }
37             if (_Content != null)
38             {
39                 if (!string.IsNullOrEmpty(_Content))
40                 {
41                     pageinationInfo.strWhere += " and Content like '%" + _Content.Trim() + "%'";
42                 }
43             }
44             #endregion
45 
46 
47             IList<SnsModels.ArticleInfo> List = PageinationInfoManager.GetPageinationInfoList<SnsModels.ArticleInfo>(pageinationInfo);
48 
49             #region 传值
50             ViewBag.List = List;
51             ViewBag.pageNumber = pageNumber;
52             ViewBag.pageSize = pageSize;
53             ViewBag.RecordCount = pageinationInfo.RecordCount;
54             ViewBag.LabelName =HttpUtility.UrlDecode(LabelName);
55             ViewBag._Title = _Title;
56             ViewBag._Content = _Content;
57             #endregion
58 
59             return View();
60         }

上面我们通过把参数传递到PageinationInfo,然后根据传递的参数拼凑pageinationInfo.strWhere现实了多条件查询,

pageNumber,pageSize 我们已经传递到View,你可以通过Jquery插件展示你的分页,点击一下一页的时候,跳转回控制器就行了。

 

4,接下来,我给出存储过程,代码如下:

USE [LearningLogManagerDB2]
GO
/****** Object:  StoredProcedure [dbo].[LYBPager]    Script Date: 07/30/2014 11:51:44 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO


--参数说明-------------------------------------------------------------
/**//*
@strTable --要显示的表或多个表的连接
@strField --要查询出的字段列表,*表示全部字段
@pageSize --每页显示的记录个数
@pageIndex --要显示那一页的记录
@strWhere --查询条件,不需where
@strSortKey --用于排序的主键
@strSortField --用于排序,如:id desc (多个id desc,dt asc)
@strOrderBy --排序,0-顺序,1-倒序
@RecordCount --查询到的总记录数
@UsedTime --耗时测试时间差
*/


ALTER PROCEDURE [dbo].[LYBPager]
@strTable varchar(1000) = '[dbo].[ttable]',--表名
@strField varchar(1000) = '*', --查询字段
@pageSize int = 10,  --每页多少条记录
@pageIndex int = 1,  --当前页
@strWhere varchar(1000) = '1=1', --查询条件
@strSortKey varchar(1000) = 'id', --主键
@strSortField varchar(500) = 'id DESC', --排序
@strOrderBy bit = 1, --是否排序   1表示排序
@RecordCount int OUTPUT,  --总记录数
@UsedTime int OUTPUT --查询耗时,毫秒为单位
AS
SET NOCOUNT ON
Declare @sqlcount INT
Declare @timediff DATETIME
select @timediff=getdate()
Begin Tran
DECLARE @sql nvarchar(500),@where1 varchar(200),@where2 varchar(200)
    IF @strWhere is null or rtrim(@strWhere)=''
        BEGIN--没有查询条件
            SET @where1=' WHERE '
            SET @where2=' '
        END
    ELSE
        BEGIN--有查询条件
            SET @where1=' WHERE ('+@strWhere+') AND ' --本来有条件再加上此条件
            SET @where2=' WHERE ('+@strWhere+') ' --原本没有条件而加上此条件
        END
    --SET @sql='SELECT @intResult=COUNT(*) FROM '+@strTable+@where2

    BEGIN
        SET @sql='SELECT @sqlcount=COUNT(*) FROM (select '+@strSortKey+' from '+ @strTable + @where2 +') As tmptab'
    END
    --print @sql

EXEC sp_executesql @sql,N'@sqlcount int OUTPUT',@sqlcount OUTPUT --计算总记录数
SELECT @RecordCount = @sqlcount --设置总记录数
    IF @pageIndex=1 --第一页
        BEGIN
            SET @sql='SELECT TOP '+CAST(@pageSize AS varchar(200))+' '+@strField+' FROM '+@strTable+@where2+'ORDER BY '+ @strSortField
        END
    Else
        BEGIN
            IF @strOrderBy=0
                SET @sql='SELECT TOP '+CAST(@pageSize AS varchar(200))+' '+@strField+ ' FROM '+
                    @strTable+@where1+@strSortKey+'>(SELECT MAX('+case when charindex('.',@strSortKey)>0 then right(@strSortKey,len(@strSortKey)-charindex('.',@strSortKey)) else @strSortKey end+') '+ ' FROM (SELECT TOP '+
                    CAST(@pageSize*(@pageIndex-1) AS varchar(200))+' '+@strSortKey+' FROM '+@strTable+@where2+
                    'ORDER BY '+@strSortField+') t) ORDER BY '+@strSortField
            ELSE
                SET @sql='SELECT TOP '+CAST(@pageSize AS varchar(200))+' '+@strField+' FROM '+@strTable+@where1+
                    @strSortKey+'<(SELECT MIN('+case when charindex('.',@strSortKey)>0 then right(@strSortKey,len(@strSortKey)-charindex('.',@strSortKey)) else @strSortKey end+') '+ ' FROM (SELECT TOP '+CAST(@pageSize*(@pageIndex-1) AS varchar(200))+' '+
                    @strSortKey+' FROM '+@strTable+@where2+'ORDER BY '+@strSortField+') t) ORDER BY '+@strSortField+''
        END
print @sql
--select @RecordCount
EXEC(@sql)
print @sql
If @@Error <> 0
Begin
RollBack Tran
Return -1
End
Else
Begin
Commit TRAN
set @UsedTime = datediff(ms,@timediff,getdate())
--select @UsedTime
--select datediff(ms,@timediff,getdate()) as 耗时
Return @sqlcount
End

当然存储过程不是本人写的,我只是利用而已,也用了很久了,感觉还可以,有兴趣的可以分析分析。

在此非常感谢很多博友加入本人ASP.NET MVC QQ群,并且都很踊跃提问。

 

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posted @ 2014-07-30 14:54  kezhiping  阅读(9482)  评论(47编辑  收藏  举报