Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Ask a Question
Welcome To Ask or Share your Answers For Others

Categories

laravel中的simplePaginate（进行一次查询完成分页）是怎么实现的？？

0 votes
3.8k views
in Technique[技术] by (71.8m points)

laravel中的simplePaginate（进行一次查询完成分页）是怎么实现的？？

如图所示，打印laravel中simplePaginate用到的sql语句，它只用了一条sql。
但从结果上看，它可以判断下一页是否有数据，这是怎么做到的？
不计算总数，是怎么知道下一页还有没有数据的？
image.png
image.png
image.png


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

laravel的simplePaginate和paginate，传入的参数都是每页数量，但是实际上查询逻辑有区别

simplePaginate的需求简单，只生成上一页和下一页链接，所以用一条冗余查询(你打印的SQL中就可以看出是limit 3)来换取少一次查询，实际返回的结果还是你参数定义的每页数量

你再打印下paginate执行的SQL，你会发现是两条，一条count，一条实际查询


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

Just Browsing Browsing

2.1m questions

2.1m answers

60 comments

56.6k users

Most popular tags

Powered by Question2Answer
Donate
Theme by Q2A Market&&OStack.cn
...