Home Database Mysql Tutorial Oracle、SQL Server、Access数据库高效果分页技巧

Oracle、SQL Server、Access数据库高效果分页技巧

Jun 07, 2016 pm 03:16 PM
access oracle server sql database high

在程序的开发过程中,处理分页是大家接触比较频繁的事件,因为现在软件基本上都是与数据库进行挂钓的。但效率又是我们所追求的,如果是像原来那样把所有满足条件的记录全部都选择出来,再去进行分页处理,那么就会多多的浪费掉许多的系统处理时间。为了能够

 在程序的开发过程中,处理分页是大家接触比较频繁的事件,因为现在软件基本上都是与数据库进行挂钓的。但效率又是我们所追求的,如果是像原来那样把所有满足条件的记录全部都选择出来,再去进行分页处理,那么就会多多的浪费掉许多的系统处理时间。为了能够把效率提高,所以现在我们就只选择我们需要的数据,减少数据库的处理时间,以下就是常用SQL分页处理:

  1、SQL Server、Access数据库

  这都微软的数据库,都是一家人,基本的操作都是差不多,常采用如下分页语句:

  PAGESIZE:每页显示的记录数

  CURRENTPAGE:当前页号

  数据表的名字是:components

  索引主键字是:id

以下是引用片段:
  select top PAGESIZE * from components where id not in
  (select top (PAGESIZE*(CURRENTPAGE-1))
  id from components order by id)order by id

  如下列:

以下是引用片段:
  select top 10 * from components where id not in
  (select top 10*10 id from components order by id)
  order by id

  从101条记录开始选择,只选择前面的10条记录

  2、Oracle数据库

  因为Oracle数据库没有Top关键字,所以这里就不能够像微软的数据据那样操作,这里有两种方法:

  (1)、一种是利用相反的。

  PAGESIZE:每页显示的记录数

  CURRENTPAGE:当前页号

  数据表的名字是:components

  索引主键字是:id

以下是引用片段:
  select * from components where id not
  in(select id from components where
  rownum  and rownum

  如下例:

以下是引用片段:
  select * from components where id not in
  (select id from components where rownum  and rownum

  从101到记录开始选择,选择前面10条。

  (2)、使用minus,即中文的意思就是减去。

以下是引用片段:
  select * from components where rownum
    select * from components where rownum
  

  如例:select * from components where

以下是引用片段:
  rownum  where rownum

  (3)、一种是利用Oracle的rownum,这个是Oracle查询自动返回的序号,一般不显示,但是可以通过select rownum from [表名]看到,注意,它是从1到当前的记录总数。

以下是引用片段:
  select * from (select rownum tid,components.
  * from components where rownum
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