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常見數(shù)據(jù)庫的分頁實現(xiàn)方案
1.Oracle:
- select * from ( select row_.*, rownum rownum_ from ( query_SQL ) row_ where rownum =< max) where rownum_ >= min
2.SQL Server:
- select top @pagesize * from tablename where id not in (select top @pagesize*(@page-1) id from tablename order by id) order by id
3.MySQL
- select * from tablename limit position, counter
4.DB2
- select * from (select *,rownumber() as ROW_NEXT from tablename) where ROW_NEXT between min and max
1.分頁方案一：(利用Not In和SELECT TOP分頁)效率次之
語句形式：
- SELECT TOP 10 * FROM TestTable
- WHERE(ID NOT IN (SELECT TOP 20 id FROM TestTable ORDERBY id)) ORDERBYID
- SELECT TOP 頁大小 * FROM TestTable
- WHERE( ID NOT IN (SELECT TOP 每頁大小-1*待查詢頁數(shù)-1 id FROM 表 ORDERBY id)) ORDERBYID
思路:先查詢出待查詢頁之前的全部條數(shù)的id,查詢ID不在這些ID中的指定數(shù)量條數(shù)
2.分頁方案二：(利用ID大于多少和SELECT TOP分頁)效率最高
語句形式：
- SELECT TOP 10 * FROM TestTable
- WHERE(ID>(SELECT MAX(id) FROM(SELECT TOP20 id FROM TestTable ORDERBYid)AS T))ORDERBY ID
- SELECT TOP 頁大小* FROM TestTable
- WHERE(ID>(SELECT MAX(id) FROM(SELECT TOP 每頁大小*待查詢頁數(shù)-1 id FROM 表 ORDERBY id)AS T)) ORDERBY ID
思路:先獲得待查詢頁的之前全部條數(shù)id,獲得它們當中最大的ID號,以此最大ID號為標志,查找比這個ID號大的指定條數(shù)
3.分頁方案三：
- SELECT TOP PageSize * FROM(SELECT TOP nPage*PageSize * from YOURTABLE order by id)as a order by id desc
- SELECT TOP 每頁條數(shù) * FROM (SELECT TOP 待查詢頁*每頁條數(shù)) * from YOURTABLE order by id)as a order by id desc
思路:先正排序查詢出待查詢頁之前(包括當前頁)的全部條數(shù),然后將其倒排序,取指定條數(shù)
新聞標題：常見數(shù)據(jù)庫的分頁實現(xiàn)方案
標題網(wǎng)址：http://m.fisionsoft.com.cn/article/dhpopde.html
