数据库分页问题

显示指定表、视图、查询结果的第X页
对于表中主键或标识列的情况,直接从原表取数查询，其它情况使用临时表的方法
如果视图或查询结果中有主键,不推荐此方法
如果使用查询语句,而且查询语句使用了order by,则查询语句必须包含top 语句

--感谢csdn.net邹建  --*/

/*--调用示例
exec p_show '地区资料'

exec p_show 'select top 100 percent * from 地区资料 order by 地区名称',5,3,'地区编号,地区名称,助记码'
--*/
CREATE Proc p_show
@QueryStr nvarchar(4000),--表名、视图名、查询语句
@PageSize int=20,--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,如果查询结果不需要标识字段,需要指定此值,且不包含标识字段
@FdOrder nvarchar (1000)=''--排序字段列表
as
set nocount on
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
)
GO



-- 获取指定页的数据
CREATE PROCEDURE GetRecordFromPage
    @tblName      varchar(255),       -- 表名
    @fldName      varchar(255),       -- 字段名
    @PageSize     int = 10,           -- 页尺寸
    @PageIndex    int = 1,            -- 页码
    @IsCount      bit = 0,            -- 返回记录总数, 非 0 值则返回
    @OrderType    bit = 0,            -- 设置排序类型, 非 0 值则降序
    @strWhere     varchar(1000) = ''  -- 查询条件 (注意: 不要加 where)
AS

declare @strSQL   varchar(6000)       -- 主语句
declare @strTmp   varchar(100)        -- 临时变量
declare @strOrder varchar(400)        -- 排序类型

if @OrderType != 0
begin
    set @strTmp = "<(select min"
    set @strOrder = " order by [" + @fldName +"] desc"
end
else
begin
    set @strTmp = ">(select max"
    set @strOrder = " order by [" + @fldName +"] asc"
end

set @strSQL = "select top " + str(@PageSize) + " * from ["
    + @tblName + "] where [" + @fldName + "]" + @strTmp + "(["
    + @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["
    + @fldName + "] from [" + @tblName + "]" + @strOrder + ") as tblTmp)"
    + @strOrder

if @strWhere != ''
    set @strSQL = "select top " + str(@PageSize) + " * from ["
        + @tblName + "] where [" + @fldName + "]" + @strTmp + "(["
        + @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["
        + @fldName + "] from [" + @tblName + "] where " + @strWhere + " "
        + @strOrder + ") as tblTmp) and " + @strWhere + " " + @strOrder

if @PageIndex = 1
begin
    set @strTmp = ""
    if @strWhere != ''
        set @strTmp = " where " + @strWhere

    set @strSQL = "select top " + str(@PageSize) + " * from ["
        + @tblName + "]" + @strTmp + " " + @strOrder
end

if @IsCount != 0
    set @strSQL = "select count(*) as Total from [" + @tblName + "]"

exec (@strSQL)

GO