数据库分页

类别:.NET开发 点击:0 评论:0 推荐:

CREATE Proc p_show
@QueryStr nvarchar(4000),           --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 nvarchar (4000)='', --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 (1000)='', --排序字段列表

@sql varchar(4000)='',
@getcount int=0 out   -- 记录数

as
begin


exec(@Sql)


end

begin
declare @FdName nvarchar(250) --表中的主键或表、临时表中的标识列名
 ,@Id1 varchar(20),@Id2 varchar(20) --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(2000) --复合主键列表
 ,@strjoin nvarchar(4000) --连接字段
 ,@strwhere nvarchar(2000) --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(20))
 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(20))
  ,@Id2=cast((@PageCurrent-1)*@PageSize as varchar(20))

 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(40))+']'
 ,@Id1=cast(@PageSize*(@PageCurrent-1) as varchar(20))
 ,@Id2=cast(@PageSize*@PageCurrent-1 as varchar(20))

exec('select '+@FdName+'=identity(int,0,1),'+@FdShow+'
  into #tb from '+@QueryStr+@FdOrder+'
 select '+@FdShow+' from #tb where '+@FdName+' between '
 +@Id1+' and '+@Id2
 )
end
GO

asp中使用方法:
<%
page = trim(request.QueryString("page"))
if page="" then
 ipage = 1
else
 ipage = cint(page)
end if
pagesize = 30

set rs = server.CreateObject("adodb.recordset")
sqlstr="select top 1000000 id,lovedress,chattoolnote,email from [5years_vote]  order by id desc "
sqlstr1="select count(1) from [5years_vote]"
sql="p_show '"&sqlstr&"',"&pagesize&","&ipage
'Response.Write sql
'Response.End
rs.Open sql, conn, 3,3
'Response.Write sqlstr
'Response.End

%>


c#:

 public DataSet GetResumeListBox(int pagesize,int PageCurrent)
  {
   SqlDataAdapter sda=new SqlDataAdapter() ;
   DataSet ds =new DataSet();
   sda.SelectCommand = (new DataAccess.DbCFG()).GetCommand();
   
            string sql="SELECT top "+DbCFG.TopCount+" dbo.BaseInfo.*,dbo.ApplyJob.id as aid,jobinfo.jobname FROM dbo.ApplyJob RIGHT OUTER JOIN dbo.BaseInfo ON dbo.ApplyJob.rid = dbo.BaseInfo.id left join jobinfo on ApplyJob.jobid=jobinfo.id where dbo.ApplyJob.JobId in ("+positionid+") and ApplyJob.ApplyState='0' and Iflow='0' ";
   sql+=" order by dbo.ApplyJob.sendtime DESC";
   string sql1="SELECT Count(1) FROM dbo.ApplyJob RIGHT OUTER JOIN dbo.BaseInfo ON dbo.ApplyJob.rid = dbo.BaseInfo.id left join jobinfo on ApplyJob.jobid=jobinfo.id where dbo.ApplyJob.JobId in ("+positionid+") and ApplyJob.ApplyState='0' and Iflow='0' ";
   sda.SelectCommand.Parameters[DataAccess.DbCFG.QueryStr_Parm].Value  = sql ;
   sda.SelectCommand.Parameters[DataAccess.DbCFG.Sql_Parm].Value    = sql1 ;
   sda.SelectCommand.Parameters[DataAccess.DbCFG.PageSize_Parm].Value  = pagesize;
   sda.SelectCommand.Parameters[DataAccess.DbCFG.PageCurrent_Parm].Value  = PageCurrent ; 

   sda.Fill(ds) ;
   //data=ds.Tables[1];

   return ds ;
  }

private SqlCommand SelectCommand ;

  public static string P_Show = "P_Show";      // 分页使用的存储过程名称

  public static string QueryStr_Parm  = "@QueryStr" ;  // 向分页存储过程里传入的 Sql 语句
  public static string Sql_Parm   = "@Sql" ;   // 检索行数
  public static string PageSize_Parm  = "@PageSize" ;  // 向分页存储过程里传入的 每页显示行数的值
  public static string PageCurrent_Parm = "@PageCurrent" ; // 当前显示的页码

  public static string FdShow_Parm  = "@FdShow" ;   // 传入返回时要显示的列,用逗号隔开。例:"col1,col2"
  public static string FdOrder_Parm  = "@FdOrder" ;  // 排序

  public SqlCommand GetCommand()
  {
   if ( SelectCommand == null )
   {
    SelectCommand = new SqlCommand( P_Show , new SqlConnection(DbCFG.ConnectionString) ) ;
    SelectCommand.CommandType = CommandType.StoredProcedure ;

    SelectCommand.Parameters.Add(new SqlParameter(QueryStr_Parm, SqlDbType.NVarChar, 4000 )) ;
    SelectCommand.Parameters.Add(new SqlParameter(Sql_Parm, SqlDbType.NVarChar, 4000 )) ;
    SelectCommand.Parameters.Add(new SqlParameter(PageSize_Parm , SqlDbType.Int)) ;
    SelectCommand.Parameters.Add(new SqlParameter(PageCurrent_Parm , SqlDbType.Int)) ;

   }

   return SelectCommand ;
  }

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