在Access中模擬sql server存儲(chǔ)過(guò)程翻頁(yè)
sql server存儲(chǔ)過(guò)程的翻頁(yè)是sql server數(shù)據(jù)庫(kù)操作中重要的環(huán)節(jié)之一，下文中就在Access中模擬sql server存儲(chǔ)過(guò)程翻頁(yè)的過(guò)程，供大家參考。
sql server中翻頁(yè)存儲(chǔ)過(guò)程:
Create PROC blog_GetPagedPosts
(
@PageIndex int,
@PageSize int,
@BlogID int=0,
@PostType int=-1,
@CategoryID int=-1,
@Hiding bit =0,
@Count int output
)
as
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int
SET @PageLowerBound = @PageSize * @PageIndex - @PageSize
SET @PageUpperBound = @PageLowerBound + @PageSize + 1Create Table #IDs
(
TempID int IDENTITY (1, 1) NOT NULL,
EntryID int not null
)
Insert into #IDs(EntryID) select DISTINCT [ID] from view_Content where CategoryID=@CategoryID and blogID=@BlogID order by [ID] desc
SELECT vc.*
FROM View_Content vc
INNER JOIN #IDS tmp ON (vc .[ID] = tmp.EntryID)
WHERE tmp.TempID > @PageLowerBound
AND tmp.TempID < @PageUpperBound and vc.Hiding=0
ORDER BY tmp.TempID
SELECT @Count=COUNT(*) FROM #IDS
SELECT @Count=COUNT(*) FROM #IDS
DROP TABLE #IDS
return @Count
GO
在Access中由于不支持存儲(chǔ)過(guò)程,不能建立臨時(shí)表只能在程序中實(shí)現(xiàn)
Access中實(shí)現(xiàn)如下,這也是我在myblog Access版中使用的:
public List<DayBook> GetPagedPost(PagedPost p, out int TotalRecords)
{
List<DayBook> list = new List<DayBook>();
using (OleDbConnection conn = GetOleDbConnection())
{
StringBuilder sql = new StringBuilder();
sql.AppendFormat("select [ID] from blog_Content as p ");//構(gòu)造查詢條件
if (p.CategoryID > 0)
{
sql.AppendFormat(",blog_Categories AS c, blog_Links AS l WHERE c.CategoryID=l.CategoryID and (p.ID=l.PostID ) and c.CategoryID={1} and p.BlogID={0} ",p.BlogID, p.CategoryID);
}
else
{
sql.AppendFormat(" where p.blogID={0} ", p.BlogID);
}
if (p.PostType != PostType.Undeclared)
{
sql.AppendFormat(" and p.PostType={0} ", (int)p.PostType);
}
sql.Append(" order by p.[DateUpdated] desc");
// NetDiskContext.Current.Context.Response.Write(sql.ToString());
//NetDiskContext.Current.Context.Response.End();
OleDbCommand MyComm = new OleDbCommand(sql.ToString(), conn);
List<int> IDs = new List<int>(); //獲取主題ID列表
conn.Open();
using (OleDbDataReader dr = MyComm.ExecuteReader())
{
while (dr.Read())
{
IDs.Add((int)dr[0]);
}
}
TotalRecords=IDs.Count;//返回記錄總數(shù)
if (TotalRecords < 1)
return list;
int pageLowerBound = p.PageSize * p.PageIndex - p.PageSize;//記錄索引
int pageUpperBound = pageLowerBound + p.PageSize ;
StringBuilder sb = new StringBuilder();
if (TotalRecords >= pageLowerBound)
for (int i = pageLowerBound; i < TotalRecords && i < pageUpperBound; i++)
{
sb.AppendFormat("{0},", IDs[i]);//構(gòu)造ID in() 條件,取其中一頁(yè)
}
else return list; //如沒(méi)有記錄返回空表
if(sb.Length>1)
sb.Remove(sb.Length - 1, 1);//刪除最后一個(gè)逗號(hào)
MyComm.CommandText = string.Format("SELECT b.* , c.Account as Account FROM blog_Content b, Blog_Config c where b.BlogID=c.BlogID and b.[ID] in ({0}) order by b.dateadded desc", sb.ToString());
using (OleDbDataReader dr = MyComm.ExecuteReader())
{
while (dr.Read())
{
list.Add(DataHelp.LoadDayBook(dr));
}
}
return list;
}
}
上文中涉及到的代碼比較多，看起來(lái)可能大家會(huì)覺(jué)得沒(méi)有頭緒，所以大家要靜下心來(lái)，認(rèn)真閱讀文章中的知識(shí)，相信大家都能夠從中收獲。
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