sql server 高效分页存储过程实例

USE [XHXFZ]
GO
/****** 对象:  StoredProcedure [dbo].[SP_Page2005] ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER  Procedure [dbo].[SP_Page2005]
@TableName varchar(5000),         --表名
@Fields varchar(5000) = '*',     --字段名(全部字段为*)
@OrderField varchar(5000),         --排序字段(必须!支持多字段，逗号隔开)
@sqlWhere varchar(5000) = Null,--条件语句(不用加where)
@pageSize int,                     --每页多少条记录
@pageIndex int = 1 ,             --指定当前为第几页
@IsStatCounts int = 0,           --是否统计记录数(0不统计，1统计)
@Counts    int = 0 output,  --查询到的记录数
@TotalPage int = 0 output             --返回总页数
as

begin
 SET NOCOUNT ON

     --Begin Tran --开始事务
 
     Declare @sql nvarchar(4000);
     Declare @totalRecord int ;   
  set @totalRecord=0;
     --计算总记录数
     if( @IsStatCounts =1)
  begin
   if (@SqlWhere='' or @sqlWhere is NULL)
   begin

    set @sql = 'select @totalRecord = count(*) from ' + @TableName
   end
   else
    set @sql = 'select @totalRecord = count(*) from ' + @TableName + ' where ' + @sqlWhere

   EXEC sp_executesql @sql,N'@totalRecord int OUTPUT',@totalRecord OUTPUT--计算总记录数
  set  @Counts=@totalRecord
 
 --计算总页数
     select @TotalPage=CEILING((@totalRecord+0.0)/@PageSize)
  end    
  

     if (@SqlWhere='' or @sqlWhere is NULL)
         set @sql = 'Select * FROM (select ROW_NUMBER() Over(order by ' + @OrderField + ') as rowId,' + @Fields + ' from ' + @TableName
     else
         set @sql = 'Select * FROM (select ROW_NUMBER() Over(order by ' + @OrderField + ') as rowId,' + @Fields + ' from ' + @TableName + ' where ' + @SqlWhere   
   

     --处理页数超出范围情况
     if @PageIndex<=0
         Set @pageIndex = 1
   
     if @pageIndex>@TotalPage
         Set @pageIndex = @TotalPage

      --处理开始点和结束点
     Declare @StartRecord int
     Declare @EndRecord int
   
     set @StartRecord = (@pageIndex-1)*@PageSize + 1
     set @EndRecord = @StartRecord + @pageSize - 1

     --继续合成sql语句
     set @Sql = @Sql + ') as selectTable where rowId between ' + Convert(varchar(50),@StartRecord) + ' and ' +   Convert(varchar(50),@EndRecord)
   -- print @Sql
     Exec sp_executesql @Sql
 
     ---------------------------------------------------
--     If @@Error <> 0
--       Begin
--         RollBack Tran
--         Return -1
--       End
--      Else
--       Begin
--         Commit Tran
--         Return @totalRecord ---返回记录总数
--       End   
end

alter PROCEDURE [dbo].[sp_PageView]
 @strSql nvarchar(1000),
 @FieldKey nvarchar(1000), --用于定位记录的主键(惟一键)字段,可以是逗号分隔的多个字段
 @PageCurrent int=1,       --要显示的页码
 @PageSize int=10,         --每页的大小(记录数)
 @PageCount int OUTPUT,    --总页数
 @ListCount int OUTPUT     --数据总条数

AS
BEGIN

    IF @PageCount IS NULL OR @PageCount=0
 BEGIN
    declare @sqlListCount nvarchar(2000),@sqlstr nvarchar(2000),@mod int,@except int
    set @sqlListCount=N'select @a=count(1) from ('+@strSql+')t'
    exec sp_executesql @sqlListCount,N'@a int output',@ListCount output

    set @mod   = @ListCount % @PageSize
    set @except= @ListCount / @PageSize
    if @mod=0
       begin
          set @PageCount =@except
       end
    else
       begin
          set @PageCount =@except+1
       end
 END

   set @sqlstr=N'select * from ('
              +N'select row_number() over (order by '+@FieldKey+') rownum,'+substring(ltrim(lower(@strSql)),7,3000)
              +N')z where rownum between '+cast(((@PageCurrent-1)*@PageSize+1) as nvarchar(20))
              +N' and '+cast(@PageCurrent*@PageSize as nvarchar(20))
   exec (@sqlstr)
   --select @ListCount,@PageCount
END