嘿伙计们只是在记录是新的时才尝试更新我的表(通过检查记录的objectId我的存储表上还没有)我的objectId是主键,
我试图添加条件realm.where(NotesRealmClass.class).notEqualTo(“objectId”,Id);
 但它似乎没有工作,我怎么能添加记录只有记录是新的或我们可以说 – 停止更新以前存储的记录

public void storeNotes( String Id, String Title ,String Location) {

    realm.beginTransaction();
    NotesRealmClass Notes = new NotesRealmClass();
    Notes.setobjectId(Id);
    Notes.setLocation(Location);
    Notes.setTitle(Title);
    realm.where(NotesRealmClass.class).notEqualTo("objectId", Id); // i tired to check if we already have the object with object Id 
    realm.copyToRealmOrUpdate(Notes);
    Toast.makeText(context, "Notes Stored", Toast.LENGTH_SHORT).show();
    realm.commitTransaction();

}

解决方法:

有2个选项.

您可以将方法copyToRealm()与try … catch一起使用. Realm不允许使用相同的主键创建对象并抛出异常.

public void storeNotes( String Id, String Title ,String Location) {
    try {
        realm.beginTransaction();
        NotesRealmClass Notes = new NotesRealmClass();
        Notes.setobjectId(Id);
        Notes.setLocation(Location);
        Notes.setTitle(Title);
        realm.copyToRealm(Notes); // <======
        Toast.makeText(context, "Notes Stored", Toast.LENGTH_SHORT).show();
        realm.commitTransaction();
    } catch (Exception error) {
        realm.cancelTransaction();
    }
}

为了做到这一点而不尝试…捕捉和更接近你的方法你应该在你的代码中修复

public void storeNotes( String Id, String Title ,String Location) {

    realm.beginTransaction();
    NotesRealmClass Notes = new NotesRealmClass();
    Notes.setobjectId(Id);
    Notes.setLocation(Location);
    Notes.setTitle(Title);
    if (realm.where(NotesRealmClass.class).equalTo("objectId", Id).count() == 0) {
        // there are no object with this `Id`
        realm.copyToRealmOrUpdate(Notes);
    } 
    Toast.makeText(context, "Notes Stored", Toast.LENGTH_SHORT).show();
    realm.commitTransaction();

}