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3077.docjava

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3077.docjava

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    一个struts+sql server的分页存储过程

    craigavon 转贴 (参与分(2620,专家分(210) 发表(2005-05-20 10:18 版本(1.0 阅读(343

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

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

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 ?pagenum="+(intPage-1) +url+">上一页</a><a ?pagenum="+(intPage+ 1)+url+"> 下一页</a> "+intPage+" "+intPageCount+ "

    "+intRowCount+"";

     }else if(intPage==1 && intRowCount<=intPageSize){

     urlchange="上一页 下一页 "+intPage+" "+intPageCount+" "+intRowCount+"";

     }else if(intPage==intPageCount && intPage!=1){

     urlchange="<a ?pagenum="+(intPage-1) +url+">上一页</a> 下一页 "+intPage+" "+intPageCount +" "+intRowCount+"";

     }else if(intPage==1 && intRowCount>=intPageSize){

     urlchange="上一页 <a ?pagenum="+ (intPage+1)+url+"> 下一页</a> "+intPage+" "+ intPageCount+" "+intRowCount+"";

     }else{

     urlchange = "<a >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;

     }

    }

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

action里可以这样调用

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

     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));

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

最后 jsp里可以这样写

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

<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

    版权声明 本篇文章对您是否有帮助; 投票( 投票结果( 作者其它文章(

    ; webwork2action里取request.getParameter参数

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    作者全部文章

     评论人(yuling1216 参与分: 4081 专家分: 163 发表时间: 2005-05-24 10:56

    写的不错,只是我好像在csdn上看见过!!!

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