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Example code of dscmall/laravel-orm-hasin

Informations about the package laravel-orm-hasin

LARAVEL HASIN

hasin是一个基于where in语法实现的Laravel ORM关联关系查询的扩展包，部分业务场景下可以替代Laravel ORM中基于where exists语法实现的has，以获取更高的性能。

环境

安装

简介

Laravel ORM的关联关系非常强大，基于关联关系的查询has也给我们提供了诸多灵活的调用方式，然而某些情形下，has使用了where exists语法实现

select * from A where exists (select * from B where A.id=B.a_id)

exists是对外表做loop循环，每次loop循环再对内表（子查询）进行查询，那么因为对内表的查询使用的索引（内表效率高，故可用大表），而外表有多大都需要遍历，不可避免（尽量用小表），故内表大的使用exists，可加快效率。

但是当A表数据量较大的时候，就会出现性能问题，那么这时候用where in语法将会极大的提高性能

select * from A where A.id in (select B.a_id from B)

in是把外表和内表做hash连接，先查询内表，再把内表结果与外表匹配，对外表使用索引（外表效率高，可用大表），而内表多大都需要查询，不可避免，故外表大的使用in，可加快效率。

因此在代码中使用has(hasMorph)或者hasIn(hasMorphIn)应由数据体量来决定……

使用

在配置文件app.php添加配置，自动注册服务

此扩展方法hasIn(hasMorphIn)支持Laravel ORM中的所有关联关系，入参调用及内部实现流程与框架的has(hasMorph)完全一致，可安全使用或替换

hasIn

whereHasIn

hasMorphIn

嵌套关联

自关联

协议

MIT 协议

All versions of laravel-orm-hasin with dependencies

PHP Build Version
Package Version
Requires php Version >=7.1.3
laravel/framework Version >=5.8|6.x
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