一個struts+sql server得分頁(預存程序版)

sql server分頁使用預存程序要更高效些
下面這個預存程序是從SQL區找到的

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CREATE Proc p_show
@QueryStr varchar(8000), --表名、視圖名、查詢語句
@PageSize int=10,   --每頁的大小(行數)
@PageCurrent int=1,   --要顯示的頁
@FdShow varchar (8000)='', --要顯示的欄位列表,如果查詢結果有識別欄位,需要指定此值,且不包含識別欄位
@FdOrder nvarchar (3000)='' --排序欄位列表
as
declare @FdName nvarchar(550) --表中的主鍵或表、暫存資料表中的識別欄位名
 ,@Id1 varchar(80),@Id2 varchar(80) --開始和結束的記錄號
 ,@Obj_ID int    --對象ID
--表中有複合主鍵的處理
declare @strfd nvarchar(4000) --複合主鍵列表
 ,@strjoin varchar(8000) --串連欄位
 ,@strwhere nvarchar(4000) --查詢條件

select @Obj_ID=object_id(@QueryStr)
 ,@FdShow=case isnull(@FdShow,'') when '' then ' *' else ' '+@FdShow end
 ,@FdOrder=case isnull(@FdOrder,'') when '' then '' else ' order by '+@FdOrder end
 ,@QueryStr=case when @Obj_ID is not null then ' '+@QueryStr else ' ('+@QueryStr+') a' end

--如果顯示第一頁，可以直接用top來完成
if @PageCurrent=1
begin
 select @Id1=cast(@PageSize as varchar(50))
 exec('select top '+@Id1+@FdShow+' from '+@QueryStr+@FdOrder)
 return
end

--如果是表,則檢查表中是否有標識更或主鍵
if @Obj_ID is not null and objectproperty(@Obj_ID,'IsTable')=1
begin
 select @Id1=cast(@PageSize as varchar(50))
  ,@Id2=cast((@PageCurrent-1)*@PageSize as varchar(50))

 select @FdName=name from syscolumns where id=@Obj_ID and status=0x80
 if @@rowcount=0   --如果表中無識別欄位,則檢查表中是否有主鍵
 begin
  if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype='PK')
   goto lbusetemp  --如果表中無主鍵,則用暫存資料表處理

  select @FdName=name from syscolumns where id=@Obj_ID and colid in(
   select colid from sysindexkeys where @Obj_ID=id and indid in(
    select indid from sysindexes where @Obj_ID=id and name in(
     select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
   )))
  if @@rowcount>1  --檢查表中的主鍵是否為複合主鍵
  begin
   select @strfd='',@strjoin='',@strwhere=''
   select @strfd=@strfd+',['+name+']'
    ,@strjoin=@strjoin+' and a.['+name+']=b.['+name+']'
    ,@strwhere=@strwhere+' and b.['+name+'] is null'
    from syscolumns where id=@Obj_ID and colid in(
    select colid from sysindexkeys where @Obj_ID=id and indid in(
     select indid from sysindexes where @Obj_ID=id and name in(
      select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
    )))
   select @strfd=substring(@strfd,2,2000)
    ,@strjoin=substring(@strjoin,5,4000)
    ,@strwhere=substring(@strwhere,5,4000)
   goto lbusepk
  end
 end
end
else
 goto lbusetemp

/*--使用識別欄位或主鍵為單一欄位的處理方法--*/
lbuseidentity:
 exec('select top '+@Id1+@FdShow+' from '+@QueryStr
  +' where '+@FdName+' not in(select top '
  +@Id2+' '+@FdName+' from '+@QueryStr+@FdOrder
  +')'+@FdOrder
  )
 return

/*--表中有複合主鍵的處理方法--*/
lbusepk: 
 exec('select '+@FdShow+' from(select top '+@Id1+' a.* from
  (select top 100 percent * from '+@QueryStr+@FdOrder+') a
  left join (select top '+@Id2+' '+@strfd+'
  from '+@QueryStr+@FdOrder+') b on '+@strjoin+'
  where '+@strwhere+') a'
  )
 return

/*--用暫存資料表處理的方法--*/
lbusetemp: 
select @FdName='[ID_'+cast(newid() as varchar(80))+']'
 ,@Id1=cast(@PageSize*(@PageCurrent-1) as varchar(50))
 ,@Id2=cast(@PageSize*@PageCurrent-1 as varchar(50))

exec('select '+@FdName+'=identity(int,0,1),'+@FdShow+'
  into #tb from'+@QueryStr+@FdOrder+'
 select '+@FdShow+' from #tb where '+@FdName+' between '
 +@Id1+' and '+@Id2
 )
GO
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這裡需要建立一個分頁類ResultGatherPro.java

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package com;

import conn.DBConnManager;//這個是資料庫連接池，可以替換成自己的
import java.sql.*;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.ArrayList;
import java.util.HashMap;
import javax.servlet.http.HttpServletRequest;
import com.util.myRedirect;

public class ResultGatherPro
{
 private String sql;
 private int intPageSize; //每頁行數
 private int intRowCount;
 private int intPageCount;
 private int intPage; //頁號
 private String Counter;

 public ResultGatherPro()
 {
  
 }
 public ResultGatherPro(String sqlcom,int rownum,int pagenum,String counter)
 {
  sql=sqlcom;
  intPageSize = rownum;
  intPage = pagenum;
  Counter = counter;
 }
 public List selectRS(String sqlcom,int rownum,int pagenum,String counter)
 {
  this.sql = sqlcom;
  this.intPageSize = rownum;
  this.intPage = pagenum;
  this.Counter = counter;
  return selectRS();
 }
 public List selectRS()
 {
  List rsall = new ArrayList();
  Map rsTree;
  DBConnManager conn = null;
  Connection  con = null;
  CallableStatement stmt = null;
  ResultSet rs = null;
  Statement st = null;
  ResultSet rsc = null;
  try{
   conn = DBConnManager.getInstance();
   con = conn.getConnection("mssql");
   st = con.createStatement();
   rsc=st.executeQuery(Counter);
   while(rsc.next())
   {
    intRowCount=rsc.getInt("allrow");
   }

   stmt = con.prepareCall("{call p_show('"+sql+"',"+intPageSize+","+intPage+")}");
   rs = stmt.executeQuery();
   ResultSetMetaData rsmd = rs.getMetaData();
   int numberOfColumns = rsmd.getColumnCount();
   Object[] aa = new Object[numberOfColumns-1];
   intPageCount = (intRowCount+intPageSize-1)/intPageSize;   
   while(rs.next())
   { 
    rsTree = new HashMap(numberOfColumns);
    for(int r=1;r<numberOfColumns+1;r++)
    {
     rsTree.put(rsmd.getColumnName(r),rs.getObject(r));      
    }
    rsall.add(rsTree);
   }   
  }catch(java.lang.Exception ex){
   ex.printStackTrace();
  }finally{
   try{
    if(rsc!=null)
     rsc.close();
    if(st!=null)
     st.close();
    if(rs!=null)
     rs.close();
    if(stmt!=null)
     stmt.close();
    if(conn!=null)
     conn.releaseConnection("mssql",con);
   }catch(Exception e){
    System.out.println(e);
   }
  }
  return rsall;
 }
 
 public String ChangePage(HttpServletRequest request)
 {
  String urlchange=null;
  String pagename = request.getRequestURI().substring(request.getRequestURI().lastIndexOf("/")+1);
  String url = getUrl(request);
  if(intPage>1 && intPage<intPageCount)
  {
   urlchange="<a href="+pagename+"?pagenum="+(intPage-1)+url+">上一頁</a><a href="+pagename+"?pagenum="+(intPage+1)+url+"> 下一頁</a> 第"+intPage+"頁 共"+intPageCount+"頁 共"+intRowCount+"條";
  }else if(intPage==1 && intRowCount<=intPageSize){
   urlchange="上一頁 下一頁 第"+intPage+"頁 共"+intPageCount+"頁 共"+intRowCount+"條";
  }else if(intPage==intPageCount && intPage!=1){
   urlchange="<a href="+pagename+"?pagenum="+(intPage-1)+url+">上一頁</a> 下一頁 第"+intPage+"頁 共"+intPageCount+"頁 共"+intRowCount+"條";
  }else if(intPage==1 && intRowCount>=intPageSize){
   urlchange="上一頁 <a href="+pagename+"?pagenum="+(intPage+1)+url+"> 下一頁</a> 第"+intPage+"頁 共"+intPageCount+"頁 共"+intRowCount+"條";
  }else{
   urlchange = "<a href="+pagename+">第一頁</a>";
  }
  return urlchange;
 }
 public String gotoPage(HttpServletRequest request)
 {
  String url = getUrl(request);
  String javascript = "<script>function checksearch()/n{if(find.pagenum.value==/"/" || find.pagenum.value==/"0/"){alert('請輸正確入頁數！');find.pagenum.focus();return false;}/nif(isNaN(find.pagenum.value)){alert('請輸入數字！');find.pagenum.focus();return false;}}</script>";
  String form = "<table  border='0' cellpadding='0' cellspacing='0'>/n"+javascript;
  form += "<form name='find'  action='' onSubmit='return checksearch()'>/n<tr><td width='40' align='center'>/n<input name='pagenum' type='text' size='2'>/n";
  if(url!=null)
  {
   if(url.indexOf("&")>0)
   {
    String[] param = new String[(url.split("&")).length];
    param = url.split("&");
    for(int i = 0;i<param.length;i++)
    { 
     form += "<input type='hidden' name='"+param[i].substring(0,param[i].indexOf("="))+"' value='"+param[i].substring(param[i].indexOf("=")+1)+"'>/n";   
    }
   }else{
    if(url.indexOf("=")>0)
    {
     form += "<input type='hidden' name='"+url.substring(0,url.indexOf("="))+"' value='"+url.substring(url.indexOf("=")+1)+"'>/n";
    }
   }
  }
  form += "</td><td width='25' align='center'><input type='submit' name='Submit' value='GO'>/n</td>/n</tr>/n</form>/n</table>";
  return form;
 }
 private String getUrl(HttpServletRequest request)
 {
  String url = "";
  Enumeration param = request.getParameterNames();
  while(param.hasMoreElements())
  {
   String pname = param.nextElement().toString();
   if(!pname.equalsIgnoreCase("pagenum"))
    url += pname+"="+request.getParameter(pname)+"&";
  }
  if(url.endsWith("&"))
  {
   url = url.substring(0,url.lastIndexOf("&"));
  }
  return url;
 }
 public String intercept(String str,int num,String last)
 {
  if(str.length()<=num)
   return str;
  else
   return str.substring(0,num)+last;
 }
}

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在action裡可以這樣調用

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   String sql = "select top 100 percent jake * from usertable"; //top 100 percent要加上
   String sqlcount = "select count(*) from usertable";//為了得到總行數
   int pagesize= 18;
   int pagenum = 1;
   if(request.getParameter("pagenum")!=null)
   {
    pagenum = java.lang.Integer.parseInt(request.getParameter("pagenum"));
   }
   ResultGatherPro rs = new ResultGatherPro(sql,pagesize,pagenum,sqlcount);
   request.setAttribute("liststill",rs.selectRS());
   request.setAttribute("changepage",rs.ChangePage(request));
   request.setAttribute("gotopage",rs.gotoPage(request));

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最後 jsp裡可以這樣寫

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<logic:iterate id="listuser" name="liststill" type="Map">
<bean:write name='listuser' property='username'/>   
<bean:write name='listuser' property='useremail'/>      
</logic:iterate>

<bean:write name='changepage' filter="false"/> 
                <bean:write name='gotopage' filter="false"/>
上面兩個一定要設定filter="false" 不然會過濾html部分