Note, this is the classic appearance of the problem, it can also surface in other scenarios, such as calling the database in a loop, or more complex object graph traversals. In those cases, it it generally much harder to see what is causing the issue. NHibernate Profiler will detect thos...
As already explained, the N+1 query problem can be triggered using any data access technology, even with plain SQL. If you select thepost_commentsusing this SQL query: List<Tuple> comments = entityManager.createNativeQuery(""" SELECT pc.id AS id, ...
如果k <= |S1|,那么第k个最小元素必然在S1中。在这种情况下,返回QuickSelect(S1, k)。 如果k = 1 + |S1|,那么枢纽元素就是第k个最小元素,即找到,直接返回它。 否则,这第k个最小元素就在S2中,即S2中的第(k - |S1| - 1)个最小元素,我们递归调用并返回QuickSelect(S2, k - |S1| - 1)。
limit 1 [1] [2017-08-04 06:22:06] local.INFO: select * from `authors` where `authors`.`id` = ? limit 1 [1] ... 然后,再次清空 laravel.log 文件,, 这次使用 with() 方法来用预加载查询作者信息: php artisan tinker >>> $posts = App\Post::with('author')->get(); >>> $posts...
一个项目可以是为一个客户，每个客户可以有许多项目。因此，这是一个简单的1:n关系，其中项目是拥有的...
Hibernate 1+N problem What's 1+N problem? When you are querying for one table, it auto calls sql command for each relational database if the fetch type is eager.In such case,it calls out 1+N sqls For example: class Thread: class Topic=1:M relationship, When we call select* from ...
Elektronikschrott gehört zu den am schnellsten wachsenden Abfallströmen. Er stellt ein sich laufend verschlimmerndes globales Problem dar. Weniger als 20 Prozent des weltweit anfallenden Elektronikschrotts werden recycelt, während unsachgemäß behandelter Elektronikschrott Land, Wasser und...
$ n node/4.9.1 ο node/8.11.3 node/10.15.0 Use up/down arrow keys to select a version, return key to install, d to delete, q to quit (You can also usejandkto select next or previous version instead of using arrows, orctrl+nandctrl+p.) ...
Assembler is a reactive data aggregation library for querying and merging data from multiple data sources/services. Assembler enables efficient implementation of the API Composition Pattern and is also designed to solve the N + 1 query problem. Architect
This script is to simulate the following problem:# 在标号为1~n的n个小球中有放回地抽取m次，求...