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一个struts sql server得分页(存储过程版)

敬业的IT人 互联网 佚名 2008-5-16 20:28:28

sql server分页使用存储过程要更高效些
下面这个存储过程是从SQL区找到的

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CREATE Proc p_show
@QueryStr varchar(8000), --表名、视图名、查询语句
@PageSize int=10, --每页的大小(行数)
@PageCurrent int=1, --要显示的页
@FdShow varchar (8000)='', --要显示的字段列表,如果查询结果有标识字段,需要指定此值,且不包含标识字段
@FdOrder nvarchar (3000)='' --排序字段列表
as
declare @FdName nvarchar(550) --表中的主键或表、临时表中的标识列名
,@Id1 varchar(80),@Id2 varchar(80) --开始和结束的记录号
,@Obj_ID int --对象ID
--表中有复合主键的处理
declare @strfd nvarchar(4000) --复合主键列表
,@strjoin varchar(8000) --连接字段
,@strwhere nvarchar(4000) --查询条件


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

--如果显示第一页，可以直接用top来完成
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,则检查表中是否有标识更或主键
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 --如果表中无标识列,则检查表中是否有主键
begin
if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype='PK')
goto lbusetemp --如果表中无主键,则用临时表处理

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 --检查表中的主键是否为复合主键
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

/*--使用标识列或主键为单一字段的处理方法--*/
lbuseidentity:
exec('select top ' @Id1 @FdShow ' from ' @QueryStr
' where ' @FdName ' not in(select top '
@Id2 ' ' @FdName ' from ' @QueryStr @FdOrder
')' @FdOrder
)
return

/*--表中有复合主键的处理方法--*/
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

/*--用临时表处理的方法--*/
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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这里需要建立一个分页类ResultGatherPro.java

--------------------------------------------------------------------------------------------------------------------------------

package com;

import conn.DBConnManager;//这个是数据库连接池，可以替换成自己的
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; //每页行数
private int intRowCount;
private int intPageCount;
private int intPage; //页号
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=http://www.pcround.cn/5/7/2007-11-04/" pagename "?pagenum=" (intPage-1) url ">上一页</a><a href=http://www.pcround.cn/5/7/2007-11-04/" pagename "?pagenum=" (intPage 1) url "> 下一页</a> 第" intPage "页 共" intPageCount "页 共" intRowCount "条";
}else if(intPage==1 && intRowCount<=intPageSize){
urlchange="上一页 下一页 第" intPage "页 共" intPageCount "页 共" intRowCount "条";
}else if(intPage==intPageCount && intPage!=1){
urlchange="<a href=http://www.pcround.cn/5/7/2007-11-04/" pagename "?pagenum=" (intPage-1) url ">上一页</a> 下一页 第" intPage "页 共" intPageCount "页 共" intRowCount "条";
}else if(intPage==1 && intRowCount>=intPageSize){
urlchange="上一页 <a href=http://www.pcround.cn/5/7/2007-11-04/" pagename "?pagenum=" (intPage 1) url "> 下一页</a> 第" intPage "页 共" intPageCount "页 共" intRowCount "条";
}else{
urlchange = "<a href=http://www.pcround.cn/5/7/2007-11-04/" pagename ">第一页</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('请输正确入页数！');find.pagenum.focus();return false;}\nif(isNaN(find.pagenum.value)){alert('请输入数字！');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里可以这样调用

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String sql = "select * from usertable";
String sqlcount = "select count(*) from usertable";//为了得到总行数
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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最后 jsp里可以这样写

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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"/>
上面两个一定要设置filter="false" 不然会过滤html部分


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