--前提是必需有一列是自动增长类型,唯一性--方法一SELECT DISTINCT TOP 8 CategoryID FROM tbl_Product_Products WHERE (UserID = 73) AND (CategoryID > (SELECT MAX(categoryid) FROM (SELECT DISTINCT TOP 16 categoryid FROM tbl_product_products where userid=73 ORDER BY categoryid) AS b)) ORDER BY CategoryID--方法二select top 10 * from [order details] where orderid>all(select top 10 orderid from [order details] order by orderid) order by orderid
从来没用过分页控件,自己写一个SQL,用TOP语句,可能效率不高,但是简单int pageIndex = 2;//当前页号 int pageSize = 20; //每页显示记录数 string sql; //SQL语句int recordBefore = (pageIndex - 1) * pageSize;if (recordBefore == 0) sql = "select top " + pageSize + " 字段 from [table] order by 排序字段 DESC"; else sql = "select top " + pageSize + " 字段 from [table] where 字段 not in (select top " + recordBefore + " 某一字段(如ID) from [table] order by 排序字段 DESC) order by 排序字段 DESC"大概就是这样
SELECT TOP PAGESIZE NEWSTITLE FORM NEWSINFO WHERE NEWSID NOT IN (SELECT TOP (PAGE-1)* PAGESIZE NEWSID FROM NEWSINFO WHERE Auditing=1 and NEWSBREED='企业新闻' order by NEWSID DESC) AND Auditing=1 and NEWSBREED='企业新闻' order by NEWSID DESC
FROM tbl_Product_Products
WHERE (UserID = 73) AND (CategoryID >
(SELECT MAX(categoryid)
FROM (SELECT DISTINCT TOP 16 categoryid
FROM tbl_product_products where userid=73
ORDER BY categoryid) AS b))
ORDER BY CategoryID--方法二select top 10 * from [order details]
where orderid>all(select top 10 orderid from [order details] order by orderid)
order by orderid
FROMTestTable
WHERE(IDNOTIN
(SELECTTOP20id
FROMTestTable
ORDERBYid))
ORDERBYID
SELECTTOP页大小*
FROMTestTable
WHERE(IDNOTIN
(SELECTTOP页大小*页数id
FROM表
ORDERBYid))
ORDERBYID
2.分页方案二:(利用ID大于多少和SELECT TOP分页) 语句形式: SELECTTOP10*
FROMTestTable
WHERE(ID>
(SELECTMAX(id)
FROM(SELECTTOP20id
FROMTestTable
ORDERBYid)AST))
ORDERBYID
SELECTTOP页大小*
FROMTestTable
WHERE(ID>
(SELECTMAX(id)
FROM(SELECTTOP页大小*页数id
FROM表
ORDERBYid)AST))
ORDERBYID
3.分页方案三:(利用SQL的游标存储过程分页)create procedureSqlPager
@sqlstrnvarchar(4000),--查询字符串
@currentpageint,--第N页
@pagesizeint--每页行数
as
setnocounton
declare@P1int,--P1是游标的id
@rowcountint
execsp_cursoropen@P1output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcountoutput
selectceiling(1.0*@rowcount/@pagesize)as总页数--,@rowcountas总行数,@currentpageas当前页
set@currentpage=(@currentpage-1)*@pagesize+1
execsp_cursorfetch@P1,16,@currentpage,@pagesize
execsp_cursorclose@P1
setnocountoff
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
int pageSize = 20; //每页显示记录数
string sql; //SQL语句int recordBefore = (pageIndex - 1) * pageSize;if (recordBefore == 0)
sql = "select top " + pageSize + " 字段 from [table] order by 排序字段 DESC";
else
sql = "select top " + pageSize + " 字段 from [table] where 字段 not in (select top " + recordBefore + " 某一字段(如ID) from [table] order by 排序字段 DESC) order by 排序字段 DESC"大概就是这样
FORM NEWSINFO WHERE NEWSID NOT IN
(SELECT TOP (PAGE-1)* PAGESIZE NEWSID FROM NEWSINFO
WHERE Auditing=1 and NEWSBREED='企业新闻' order by NEWSID DESC)
AND Auditing=1 and NEWSBREED='企业新闻' order by NEWSID DESC
其中:PAGE表示当前页数,PAGESIZE表示页的大小;这里利用了NOT IN,不复合SARG,但总比一次读取全部的记录要好的多。