SQL Server 多表分页存储过程

------------------------------------------------------------
--
--通用的分页存储过程
--
-------------------------------------------------------------
CREATE PROCEDURE [dbo].[kk_fenyetwo]
@CurrentPage int, --@CurrentPage为显示那一页
@PageSize int,--@PageSize为每一页显示几行
@Tcount int,
@Field_Info varchar(500),--@Field_info为要显示的字段可以为*
@Table_info varchar(500),--@Table_info为要查询的表或视图
@OtherTable varchar(1000),
@Field_id varchar(1000),--@field_id为按这个字段排序
@intOrder int,--@intorder0为升序排1为降序排
@otherwhere varchar(1000),--@otherwhere为条件
@RecordCount int output,--@RecordCount为总行数
@PageCount int output--@PageCount为总页数

AS
begin
	DECLARE @MinPage int, @MaxPage int
	declare @sql varchar(1000)
	declare @sqlt nvarchar(300)
	declare @order varchar(4)
	declare @strWhere varchar(100)
	declare @sqlp varchar(1000)
	set @Field_Info = replace(@Field_Info,'''','')       --除去@field_info中的'
	set @Table_info = replace(@table_info,'''','')       --除去@table_info中的'
	set @Field_id = replace(@Field_id,'''','')            --除去@field_id中的'
	set @otherwhere = @otherwhere    --将@otherwhere中的'换成''让SQL语句正确释别'
	set @strWhere=' Where (1=1) '
	if @Tcount=1
		set @sqlt = 'SELECT @RecordCount = COUNT(*) FROM ' + @Table_Info
	else
		set @sqlt = 'SELECT @RecordCount = COUNT(*) FROM ' + @Table_Info + @OtherTable
	if @otherwhere like ''
		set @sqlt = @sqlt
	else
		set @sqlt = @sqlt+@strWhere+@otherwhere
	--print @sqlt
	exec sp_executesql @sqlt,N'@RecordCount int output',@RecordCount output     --如何将exec执行结果放入变量中,如果是字符串就要用N,N后面的变量一定要和@sqlt里面的变量同名
	IF @PageSize <= 0
		begin
			set @PageSize = 10
		end
	else if @PageSize > @RecordCount
		begin
			set @pageSize = @RecordCount
		end
	if @RecordCount=0
		set @pagecount=0
	else
	begin
		set @pagecount = @RecordCount / @PageSize
		if ((@RecordCount % @pagesize) != 0)					--如果除不尽则加一页
			begin
				set @PageCount = @RecordCount / @PageSize
				set @PageCount = @pagecount + 1
			end
		else
			begin
				set @pagecount = @RecordCount /@PageSize
			end
	end
	IF @CurrentPage <= 0
		begin
			set @CurrentPage = 1
		end
	else if @CurrentPage > @pagecount
		begin		
			set @currentpage = @pagecount		--如果输入页数大于总页数则符最后一页
		end
	SET @MinPage = (@CurrentPage - 1) * @PageSize + 1
	SET @MaxPage = @MinPage + @PageSize - 1
	set @sqlp=' ) as a where rownumber between ' + convert(varchar(10),@minpage) + ' and '+convert(varchar(10),@maxpage)
	BEGIN
		if @intorder = 0
			set @order = 'asc'
		else
			set @order = 'desc'
		if @Field_Info like ''
			set @field_Info = '*'
		if @Tcount=1
			set @sql = 'select * from (select ' +  @Field_Info + ' , row_number() over(order by ' + @Field_id + ' ' + @Order + ') as rownumber from ' + @Table_info
		else
			set @sql = 'select * from (select ' +  @Field_Info + ' , row_number() over(order by ' + @Field_id + ' ' + @Order + ') as rownumber from ' + @Table_info + @OtherTable
		if @otherwhere like ''
			set @sql = 'select * from (select ' +  @Field_Info + ' , row_number() over(order by ' + @Field_id + ' ' + @Order + ') as rownumber from ' + @Table_info
		else
			set @sql = 'select * from (select ' +  @Field_Info + ' , row_number() over(order by ' + @Field_id + ' ' + @Order + ') as rownumber from ' + @Table_info +  @OtherTable+ @strWhere+ @otherwhere
		
		set @sql=@sql+@sqlp
		--print @sql
		exec(@sql)
	END
end

分页的三种方案：
建立表：

CREATE TABLE [TestTable] ( 
[ID] [int] IDENTITY (1, 1) NOT NULL , 
[FirstName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL , 
[LastName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL , 
[Country] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL , 
[Note] [nvarchar] (2000) COLLATE Chinese_PRC_CI_AS NULL 
) ON [PRIMARY] 
GO

插入数据：(2万条，用更多的数据测试会明显一些)

SET IDENTITY_INSERT TestTable ON

declare @i int 
set @i=1 
while @i<=20000 
begin 
insert into TestTable([id], FirstName, LastName, Country,Note) values(@i, ''FirstName_XXX'',''LastName_XXX'',''Country_XXX'',''Note_XXX'') 
set @i=@i+1 
end

SET IDENTITY_INSERT TestTable OFF

分页方案一：(利用Not In和SELECT TOP分页)语句形式：

SELECT TOP 10 * 
FROM TestTable 
WHERE (ID NOT IN 
(SELECT TOP 20 id 
FROM TestTable 
ORDER BY id)) 
ORDER BY ID


SELECT TOP 页大小 * 
FROM TestTable 
WHERE (ID NOT IN 
(SELECT TOP 页大小*页数 id 
FROM 表 
ORDER BY id)) 
ORDER BY ID

分页方案二：(利用ID大于多少和SELECT TOP分页）语句形式：

SELECT TOP 10 * 
FROM TestTable 
WHERE (ID > 
(SELECT MAX(id) 
FROM (SELECT TOP 20 id 
FROM TestTable 
ORDER BY id) AS T)) 
ORDER BY ID


SELECT TOP 页大小 * 
FROM TestTable 
WHERE (ID > 
(SELECT MAX(id) 
FROM (SELECT TOP 页大小*页数 id 
FROM 表 
ORDER BY id) AS T)) 
ORDER BY ID

分页方案三：(利用SQL的游标存储过程分页)语句形式：

create procedure FenYe 
@sqlstr nvarchar(4000), --查询字符串 
@currentpage int, --第N页 
@pagesize int --每页行数 
as 
set nocount on 
declare @P1 int, --P1是游标的id 
@rowcount int 
exec sp_cursoropen @P1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output 
select ceiling(1.0*@rowcount/@pagesize) as 总页数--,@rowcount as 总行数,@currentpage as 当前页 
set @currentpage=(@currentpage-1)*@pagesize+1 
exec sp_cursorfetch @P1,16,@currentpage,@pagesize 
exec sp_cursorclose @P1 
set nocount off 

其它的方案：如果没有主键，可以用临时表，也可以用方案三做，但是效率会低。
建议优化的时候，加上主键和索引，查询效率会提高。


通过SQL 查询分析器，显示比较：我的结论是:
分页方案二：(利用ID大于多少和SELECT TOP分页）效率最高，需要拼接SQL语句
分页方案一：(利用Not In和SELECT TOP分页) 效率次之，需要拼接SQL语句
分页方案三：(利用SQL的游标存储过程分页) 效率最差，但是最为通用