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直接通过SQL取分页数据实例

WBOY
Release: 2016-06-07 17:49:04
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列表页面,之前程序员用了“Wuqi.Webdiyer”的分页插件,慢,且莫明出错。看了下代码,觉得冗余太多,故决定优化一下。

从网上找了些资料,考虑直接在SQL底层,直接只取当前页的数据,再绑定,这样效率应该会高些。

核心的SQL查询语句是这样的:

 代码如下 复制代码
select top @size * from (@sqlstring) a
 where @key  and @key >= (select min(@key) from (select top @end @key from (@sqlstring) a order by @key desc) a)
 order by @key desc

 

其中:

@size:一页的数量;

@sqlstring:原始查询语句;

@key:关键字段/排序字段,它应是唯一字段;

@star:开始记录数索引,star = size*(p-1)+1;

@end:结束记录数索引,end = size*p+1;

若排序不同,则代码应做相应变化:

 代码如下 复制代码
select top @size * from (@sqlstring) a
where @key > = (select max(@key) from (select top @star @key from (@sqlstring) a order by @key asc) a)
 and @key  order by @key asc

 
我就是这样构建取数据集的方法,然后把相关参数传进来,拼接查询,返回数据集绑定即可。

这个方案暂时未发现出错,效率也有所提升。

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