SQL Server 存储过程的分页方案
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)
create procedure XiaoZhengGe
@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
在实际情况中，要具体分析。
ALTER PROCEDURE dbo.GetPageRecord
(
@tblName varchar(255), -- 表名
@fldName varchar(255), --排序字段
@KeyField varchar(255), --主键
@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 = 1, -- 设置排序类型, 非 0 值则降序
@strWhere varchar(4000) = '' -- 查询条件 (注意: 不要加 where)
)
AS
SET NOCOUNT ON
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int
-- Set the page bounds
SET @PageLowerBound = @PageSize * @PageIndex
SET @PageUpperBound = @PageLowerBound + @PageSize + 1
-- Create a temp table to store the select results
CREATE TABLE #tmp
(
RecNo int IDENTITY (1, 1) NOT NULL,
oldid int
)
--generate record
Declare @Sqlstr varchar(6000)
set @sqlstr='select '+@Keyfield+' from '+@tblname
if(@strWhere<>'')
begin
set @Sqlstr=@sqlstr+' where ('+@strWhere+')'
end
set @sqlstr=@sqlstr+' order by '+@fldName
if(@ordertype=0)
begin
set @sqlstr=@sqlstr+' asc'
end
else
begin
set @sqlstr=@sqlstr+' desc'
end
set @sqlstr='insert into #tmp (oldid) '+@sqlstr
execute(@sqlstr)
set @sqlstr='SELECT TableA.* FROM '+@tblname+' TableA (nolock), #tmp T WHERE T.oldid = TableA.'+@keyfield+' AND T.RecNo > '+ cast(@PageLowerBound as varchar)+' AND T.RecNo < '+cast(@PageUpperBound as varchar)+' ORDER BY T.RecNo'
execute(@sqlstr)
ALTER PROCEDURE dbo.GetPageRecord
(
@tblName varchar(255), -- 表名
@fldName varchar(255), --排序字段
@KeyField varchar(255), --主键
@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 = 1, -- 设置排序类型, 非 0 值则降序
@strWhere varchar(4000) = '' -- 查询条件 (注意: 不要加 where)
)
AS
SET NOCOUNT ON
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int
-- Set the page bounds
SET @PageLowerBound = @PageSize * @PageIndex
SET @PageUpperBound = @PageLowerBound + @PageSize + 1
-- Create a temp table to store the select results
CREATE TABLE #tmp
(
RecNo int IDENTITY (1, 1) NOT NULL,
oldid int
)
--generate record
Declare @Sqlstr varchar(6000)
set @sqlstr='select '+@Keyfield+' from '+@tblname
if(@strWhere<>'')
begin
set @Sqlstr=@sqlstr+' where ('+@strWhere+')'
end
set @sqlstr=@sqlstr+' order by '+@fldName
if(@ordertype=0)
begin
set @sqlstr=@sqlstr+' asc'
end
else
begin
set @sqlstr=@sqlstr+' desc'
end
set @sqlstr='insert into #tmp (oldid) '+@sqlstr
execute(@sqlstr)
set @sqlstr='SELECT TableA.* FROM '+@tblname+' TableA (nolock), #tmp T WHERE T.oldid = TableA.'+@keyfield+' AND T.RecNo > '+ cast(@PageLowerBound as varchar)+' AND T.RecNo < '+cast(@PageUpperBound as varchar)+' ORDER BY T.RecNo'
execute(@sqlstr)
(原创李宏根)
