Hibernate Grails3-在控制器退出后防止不必要的select语句

请原谅这个做作的例子。我只是不明白为什么会发生这些选择

域对象：

class Author {
    String name
    Location location

    static mapping = {
        location lazy: true //this is default, but set here to reduce confusion
    }

    static constraints = {
    }
}

引导初始化：

def init = { servletContext ->
        Location loc = new Location(address: '123 asdf dr', longLat: new LongLat(longitude: 0.5, latitude: 0.5)).save(flush:true)
        new Author(name: 'Author Name', location: loc).save(flush:true)
    }

来自控制器的操作：

def index() {
    println "Start Controller"
    Author.get(1)
    render '1'
    println "End Controller"
}

我已打开日志记录：

logSql: true
formatSql: true

输出：

Grails application running at http://localhost:8080 in environment: development
Start Controller
Hibernate:
    select
        this_.id as id1_0_0_,
        this_.version as version2_0_0_,
        this_.location_id as location3_0_0_,
        this_.name as name4_0_0_
    from
        author this_
    where
        this_.id = ?
End Controller
Hibernate:
    select
        location0_.id as id1_1_0_,
        location0_.version as version2_1_0_,
        location0_.address as address3_1_0_
    from
        location location0_
    where
        location0_.id=?
Hibernate:
    select
        longlat0_.id as id1_2_0_,
        longlat0_.version as version2_2_0_,
        longlat0_.latitude as latitude3_2_0_,
        longlat0_.location_id as location4_2_0_,
        longlat0_.longitude as longitud5_2_0_
    from
        long_lat longlat0_
    where
        longlat0_.location_id=?

为什么会发生最后两个选择，我如何在不诉诸HQL的情况下阻止它们

---

我使用的是Grails 3.2.3。

根据我们在评论中的对话，它很可能与OSIV（视图中的开放会话）有关。解决方案是使用

.discard（）

来确保hibernate不会检查是否有任何更改（例如脏检查）并且需要持久化。

是否显示查看

作者
对象的
位置
属性的视图？如果是这样，那么当引用
id
以外的任何内容时，这就是延迟获取关联。您可能也希望包含视图代码，以便我们能够更好地为您提供帮助。我不是在渲染Grails视图，只是“1”。这不是因为视图调用了代理域对象，可能是因为它获取了Hibernate缓存的关联。您是否尝试过在域类关联上强制延迟加载（我看到并回忆起映射）。是的，我尝试过。我将编辑原始帖子，以减少延迟加载带来的混乱。还有两件事需要尝试。使用
load（）
而不是
get（）
，在
get（）
之后，在实例上尝试添加
discard（）
。
logSql: true
formatSql: true

Grails application running at http://localhost:8080 in environment: development
Start Controller
Hibernate:
    select
        this_.id as id1_0_0_,
        this_.version as version2_0_0_,
        this_.location_id as location3_0_0_,
        this_.name as name4_0_0_
    from
        author this_
    where
        this_.id = ?
End Controller
Hibernate:
    select
        location0_.id as id1_1_0_,
        location0_.version as version2_1_0_,
        location0_.address as address3_1_0_
    from
        location location0_
    where
        location0_.id=?
Hibernate:
    select
        longlat0_.id as id1_2_0_,
        longlat0_.version as version2_2_0_,
        longlat0_.latitude as latitude3_2_0_,
        longlat0_.location_id as location4_2_0_,
        longlat0_.longitude as longitud5_2_0_
    from
        long_lat longlat0_
    where
        longlat0_.location_id=?