Question

Android Studio 3.2，Java 1.7，Realm 4.1.0

这是我的pojo：

CREATE TRIGGER `insert_base_duplication_formula` BEFORE INSERT ON `bases`
 FOR EACH ROW INSERT INTO base_formula(base_id,raw_material_id,percent,dispense,ignore_step,main_ingredient,cost_of_use,active_flag) 
    SELECT 
        NEW.base_id_pk, 
        bf.raw_material_id, 
        bf.percent, 
        bf.dispense, 
        bf.ignore_step,
        bf.main_ingredient, 
        bf.cost_of_use,
        0
    FROM base_formula bf 
    WHERE NEW.base_duplicate IS NOT NULL 
        AND new.base_duplicate=bf.base_id

这是我如何更新public class ImageFormats extends RealmObject { private ImageSource reference; private ImageSource average; } public class ImageSource extends RealmObject { private String url; private int width; private int height; }

reference

很好用。

但是我不会更新 WHOLE 对象public void cascadeUpdate(Realm realm, ImageFormats that) { if (!EqualsUtil.areEqual(this.average, that.average)) { setAverage(that.average == null ? null : realm.copyToRealm(that.average)); } }，因为它可能仅更改一个属性，例如ImageSource

并且我尝试更新为已更改的仅Realm字段。所以我试试这个：

url

但是我得到了编译错误：

public void cascadeUpdate(Realm realm, ImageSource that) {
        if (!EqualsUtil.areEqual(this.url, that.url)) {
            setUrl(that.url == null ? null : realm.copyToRealm(that.url)); // error here
        }
    }

那么，我如何才能将其更新为“仅Realm”字段？

是否可以仅将一个字段更新为Realm？

0 个答案: